#multiplayer | Unreal Source | Page 448

winged badger Mar 16, 2019, 8:34 PM

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PlayerStartActor is not a spawner

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its just a somewhat easy to spot Actor that doesn't interact with the world in any way

inner hedge Mar 16, 2019, 8:35 PM

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Yeah*

winged badger Mar 16, 2019, 8:35 PM

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the GameMode implementation of FInd/ChoosePlayerStart takes any Actor

inner hedge Mar 16, 2019, 8:36 PM

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Yeah, I noticed that

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Thanks :)

winged badger Mar 16, 2019, 8:37 PM

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if you are using a single PlayerStart

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i would add a vector (x,y,0) of 150ish length to it at very least (rotated by say 30 degrees * number of spawned in players around z axis) to the location

inner hedge Mar 16, 2019, 8:40 PM

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Thing is, the default implementation of chooseplayer start should find an empty spot by itself

winged badger Mar 16, 2019, 8:41 PM

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not if there is only one PlayerStart

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then its the only spot

inner hedge Mar 16, 2019, 8:41 PM

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Oh yeah no, sorry there are 2 starts

dusty bear Mar 16, 2019, 9:10 PM

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Anyone know a good and easy to use third party software or plug in for bandwidth compression?

inland pond Mar 16, 2019, 11:01 PM

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I have some PlayerInformation stored inside the game instance. When I am joining a game session I want to copy them into another playerinfo variable which is inside the PlayerState. What is a good way of doing this? I was thinking about:

- call a method inside gamemode on the current joined playercontroller only on client
- then the local called playercontroller method calls a method which runs on server with only the local playerinfo from the game instance  as parameter 
- this method sets on the server side from the playercontroller the playerstate's playerinfo to the local playerinfo passed through the parameter

This seems for me a bit uncomfortable and I would like to have some advice 😮

winged badger Mar 16, 2019, 11:14 PM

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you can't access gamemode and client gameinstance from the same machine

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you can't use a GI reference in a RPC

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its not, and cannot be replicated

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in the PC, OnRep_PlayerState, you can access the GI from there and call the ServerRPC inside the PlayerState to set the variable server side

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solution won't really work in BP, as you can't override the AController::OnRep_PlayerState without c++

inland pond Mar 16, 2019, 11:17 PM

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Mh I thought about just calling a local method on the PlayerController from the game mode which then itself acessess the game instance. And I just wanted to use the PlayerInfo as parameter not the GI or have I understand you incorrect?

winged badger Mar 16, 2019, 11:17 PM

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you using c++?

inland pond Mar 16, 2019, 11:17 PM

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Just for things which arent exposed on Blueprints yet

winged badger Mar 16, 2019, 11:17 PM

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ok

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so

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to fetch a value from GameInstance, that has to be done client side

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and to set that value into PlayerState, PlayerState has to be ready

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controller's OnRep_PlayerState function executes on client only, just after that controller's PlayerState replicated

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so, it can access info from its own GameInstance, and it can set it in PlayerState

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only thing that remains is a ServerRPC so that the setter runs server side, and the PlayerInfo can be replicated to all clients

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and good place for it is AYourPlayerState::ServerSetPlayerInfo(FPlayerInfo NewInfo)

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Server, Reliable, WithValidation

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you will need to do separate set on listen server, for the host, as that OnRep won't run there

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after Super:: call in InitPlayerState override is good

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(that function runs server side only)

inland pond Mar 16, 2019, 11:30 PM

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Great thanks for the detailed explanation! So I would expose the OnRep_PlayerState for my Blueprints inside of it I grep the GameInstace's PlayerInfo and call the Server RPC ServerSetPlayerInfo? I havent understand the part with the "replicated to all clients". As of now I have a collection of all PlayerStates inside my GameMode. So do you mean a RPC on the GameMode?

winged badger Mar 16, 2019, 11:32 PM

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//PlayerState
UFUNCTION(Server, Reliable, WithValidation) void ServerSetPlayerInfo(FPlayerInfo NewPlayerInfo);
//implementation
void AMyPlayerState::ServerSetPlayerInfo_Implementation(FPlayerInfo NewPlayerInfo)
{
    PlayerInfo = NewPlayerInfo;
}
bool AMyPlayerState::ServerSetPlayerInfo_Validate(FPlayerInfo NewPlayerInfo)
{
    return true;
}
// PlayerController
UFUNCTION(BlueprintPure)
FPlayerInfo GetPlayerInfo() const;
// implementation
FPlayerInfo GetPlayerInfo() const;
{
    UMyGameInstance* GI = Cast<UMyGameInstance>(UGameplayStatics::GetGameInstance());
    if (GI) { return GI->PlayerInfo; }
    return FPlayerInfo();
}

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// PC, continued
virtual void OnRep_PlayerState() override;
virtual void InitPlayerState() override;
// implementation
void AMyPlayerController::OnRep_PlayerState()
{
    Super::OnRep_PlayerState();
    if (PlayerState) { PlayerState->ServerSetPlayerInfo(GetPlayerInfo()); }
}
void AMyPlayerController::InitPlayerState()
{
    Super::InitPlayerState();
    if (PlayerState) { PlayerState->ServerSetPlayerInfo(GetPlayerInfo()); }
}

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that should be all you need for that

inland pond Mar 16, 2019, 11:37 PM

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Wow nice thanks!

winged badger Mar 16, 2019, 11:37 PM

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i did write this off the top of my head without intellisense, so minor errors are possible, but should be easy enough to correct

inland pond Mar 16, 2019, 11:38 PM

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Yeah I was thinking that ;P But before I will copy cat I will try to do it just with your explanation text

winged badger Mar 16, 2019, 11:40 PM

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probably better not to expose the GetPlayerInfo to BP and call it GetLocalPlayerInfo

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as it can seriously backfire if called on wrong controller on server

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those functions are generally better kept c++ only

inland pond Mar 16, 2019, 11:43 PM

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oh good to know. Do you mean in case of cheating or in case of returning false information?

winged badger Mar 16, 2019, 11:43 PM

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no matter on which controller you call it

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it will return the local GI

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on clients its not a problem, as there is only one controller

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on listen server, it will return the hosts PlayerInfo no matter which controller its called on

inland pond Mar 16, 2019, 11:44 PM

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Oh yes thats I have seen today after I tried to copy them from the game mode directly xD

winged badger Mar 16, 2019, 11:45 PM

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on dedicated server, it will return junk, as dedi GI will have invalid PlayerInfo in GI

inland pond Mar 16, 2019, 11:46 PM

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k ill keep this in mind. Again thanks for all the information 😄

jade gazelle Mar 17, 2019, 12:45 AM

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Does anyone else running 4.21 have the following issue? https://issues.unrealengine.com/issue/UE-66910

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Trying to figure out if that’s what’s wrong for me or if it’s something else

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Basically trying to pass TSoftObjectPtr through RPC fails

chrome bay Mar 17, 2019, 1:06 AM

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Says they've fixed it in 4.22. It kind of makes sense really, if the object isn't already loaded on the RPC receiver it would appear as null

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https://github.com/EpicGames/UnrealEngine/commit/546c17e147a12ed4ab17d678ed510b9da824ad7b

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Add full replication support for TSoftObjectPtr, both ntive and UProperty

worthy perch Mar 17, 2019, 1:10 AM

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Why would you want to send a TSoftObjectPtr through RPC? Why not just send the asset path?

jade gazelle Mar 17, 2019, 1:15 AM

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That’s what I ended up doing @worthy perch

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Just added a step to the process so I was curious about if it was even possible

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Obviously the ptr would be null on the opposite side of it wasn’t loaded but the issue was that the path wouldn’t even come through the RPC, it just comes through empty

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@chrome bay thanks for the notes, I’ll just mark those areas in my code as temporary until 4.22 is released

gusty lily Mar 17, 2019, 5:00 AM

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looking for a recommended starter pack to base our respawn system off. i cant get respawn right so am looking to integrate an external system. any suggestions?

gusty lily Mar 17, 2019, 5:23 AM

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i should mention this is an arena fps similar to quake and UT

gusty lily Mar 17, 2019, 6:58 AM

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also, is there a way to see bandwith usage in editor? i'm concerned i'm over replicating the wrong things which is not helping the respawning situation

safe marsh Mar 17, 2019, 7:50 AM

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stat net

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shows in/out?

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I need to filter an event so it only fires on the client machine who is posessing the actor

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📎 unknown.png

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right now every client is firing when the actor is destroyed via killz

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is there some node I can use to check if the destroyed actor was possessed by the client?

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not sure why this works but it does

📎 unknown.png

rose egret Mar 17, 2019, 11:41 AM

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is there any config for disconnect detection ? normally if server disconnects clients detect it after several seconds.

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?

drifting plank Mar 17, 2019, 12:17 PM

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Except if the server is shutting down correctly (ctrl+C), it's instaneous

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@safe marsh You can check the ENetRole (If it's Authonomous_Proxy you are the owner client).

spark hemlock Mar 17, 2019, 3:12 PM

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Hi everyone! I am developing a multiplayer game and wondered, if there would be an easy way to add a player while playing in the editor. If I for example start with 3 players is there a way to press a button (or execute a command or whatever) and then have another one join, so i have 4?
or do i have to build it and then try connecting one after the other?

chrome bay Mar 17, 2019, 3:16 PM

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https://docs.unrealengine.com/en-us/Gameplay/HowTo/Networking/TestMultiplayer

spark hemlock Mar 17, 2019, 3:19 PM

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yeah but there is no "drop in while play" functionality what i want?! So it isn't possible? I have to build it and then open 4 instances and connect one after another?!

chrome bay Mar 17, 2019, 3:21 PM

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Literally the first image shows how you can test multiple players in one session without building

spark hemlock Mar 17, 2019, 3:22 PM

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yeah i know. I think there is a misunderstaning here. I want ot start a round. Play for a while and THEN add another player.

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so play one round with 3 players the next with

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4

chrome bay Mar 17, 2019, 3:22 PM

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In that case I don't think so

spark hemlock Mar 17, 2019, 3:22 PM

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hmm.. that's painful. Thanks!

rose egret Mar 17, 2019, 4:33 PM

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guys I have written my own back end service for matchmaking and login , ...
now I am using it in my UE4 project. when AGameModeBase::PreLogin is called. I get a const FUniqueNetIdRepl& UniqueId which is unrelated to my system since I am not using any online sub system. is there any way to override its generator or something like that

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?

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should I write my own online subsytem for UE4

worthy perch Mar 17, 2019, 4:37 PM

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Couldn't you just add another property on your PlayerController/PlayerState class and use that for your service?

rose egret Mar 17, 2019, 4:40 PM

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🤔

eager geyser Mar 17, 2019, 5:09 PM

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what are your opinion in mmo of maximum 35 people what is more important out of these

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1.good gameplay but more ui interaction and what is displayed on screen like who killed whom and who is eliminated like in pubg and gerera game

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2.excellent gameplay but less ui interation

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3.both should be equal

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everyone free to give their opinion

tranquil thunder Mar 17, 2019, 5:20 PM

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2 all day anyday

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gameplay above all else IMHO

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MMOs usually have too much screen clutter anyway

graceful cave Mar 17, 2019, 7:54 PM

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i dont see how having a killfeed means gameplay has to be worse

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if ui interaction is part of achieving the game play youre going for then do it that way

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or else have less ui interaction

thin stratus Mar 17, 2019, 9:16 PM

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Excellent gameplay should be your priority either way

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If you think that players should see who killed whom, then add a killfeed

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If you think it takes away from the immersive part of your game, then don't.

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UI interaction would actually mean that you interact with the UI

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While stuff that just pops up on the screen isn't really interaction, but information

plucky jasper Mar 17, 2019, 10:56 PM

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Anyone who knows which delegate that gets fired when you try to join a friend through the steam overlay, without the host sending an invite first?

slender yarrow Mar 18, 2019, 12:23 AM

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how do you run a check with a branch for the client? I have conditions to check before you can sprint. Arent you supposed to check those variables on the server? The client is showing false which im assuming is cause its checking the speed of the server's char. What is that proper way to branch check on client?

📎 2.jpg

plucky jasper Mar 18, 2019, 12:58 AM

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You probably need to set the variable on both the server and the client.
Otherwise replicate the variable from the server to the client.

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Though this will ofc come with a latency delay, so if you want to avoid that, then you need to "predict" it on the client first - in which case you just set the variable on the client first - the server won't allow the client to move too far beyond the location of where the character is on the server anyway

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@slender yarrow

slender yarrow Mar 18, 2019, 1:01 AM

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is that normal practice for doing checks in replication?

meager spade Mar 18, 2019, 1:02 AM

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the idea is to do it predictively like Zoin said

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no one wants to sprting and have to wait X amount of time for the server to let them

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same as firing

cedar finch Mar 18, 2019, 1:08 AM

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So I made a variable inside my playerstate called "NameOfPlayer" and it gets set from a Run on Server RPC inside my player controller. I then have a widget attached to my pawn character that retrieves that "NameOfPlayer" variable from my playerstate and sets it's text to it. So basically I have a playername above my head. My problem is that it is setting all players in the lobby to that same name. So Player1 sees everyone in the lobby with the name Player1. Player2 sees everyone in the game as Player2. What am I missing in terms of replication? What causes it to set everyones name? https://i.gyazo.com/514671526cd8929fd8155aaec97bcf25.png

graceful cave Mar 18, 2019, 1:48 AM

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@cedar finch cant determine the problem without seeing the code

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is the variable replicated? is the RPC called on begin play?

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if its called on begin play then all clients are running that code and calling the RPC

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or at least attempting to call it

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but if youre getting a locally saved variable from the client calling the run on server rpc, then all clients would be trying to do it if you arent checking that its the local player state

cedar finch Mar 18, 2019, 1:50 AM

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Hold on I'll post what i did.

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https://i.gyazo.com/9687a805415751e8852f4c897bc622be.png https://i.gyazo.com/c4c360ef6bb05cb887a9d493d73a7721.png https://i.gyazo.com/c180166b7819206de8c94756f4d3edb8.png https://i.gyazo.com/f9d262dd2a8ec6e93b2efafddd0f79cb.png

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Well they aren't showing up but the links are there lol.

graceful cave Mar 18, 2019, 1:53 AM

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is this problem happening outside the editor

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as in multiple connected clients

cedar finch Mar 18, 2019, 1:53 AM

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Yea I didn't know I had this issue until i tested it with some friends yesterday

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multiple clients correct.

graceful cave Mar 18, 2019, 1:54 AM

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so everyone is seeing their own name? or everyone sees the same name

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this variable might not need to be replicated

📎 unknown.png

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but i dont know what else its involved with

cedar finch Mar 18, 2019, 1:57 AM

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Each player is seeing their own name as everyone else. Does that make sense? It's wierd to explain. So I see everyone as Whippy. You see everyone as satan

graceful cave Mar 18, 2019, 1:58 AM

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yeah i had that problem really early on but my setup was different from yours

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where is the playersettings variable set in the player controller?

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oh wait

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📎 unknown.png

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thats always going to return the local palyer

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pass the character's player state in the widget

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and get the name from that instead

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i think the purpose of that node is intended for split screen because thats the only scenario where multiple players could ever see the same widget

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since widgets are clientside only

cedar finch Mar 18, 2019, 2:02 AM

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ok so do what now?

graceful cave Mar 18, 2019, 2:03 AM

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create a player state variable on that widget

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and set it the player state of the character the widget is attached to

cedar finch Mar 18, 2019, 2:04 AM

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Ok so this is where I get confused because my widget is added to my character inside my character's viewport. So how and where exactly do I do that? It's different from the others i've done

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https://i.gyazo.com/82a4dbad8018cb5b98324c9c89d82ff9.png

graceful cave Mar 18, 2019, 2:06 AM

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ok then in the player name function

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get parent actor

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cast to that character

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get player state

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and then both of the player states here should just connect to that instead

📎 unknown.png

cedar finch Mar 18, 2019, 2:08 AM

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But is the widget considered a child? the get parent actor doesn't show up unless i uncheck contex sensitive

graceful cave Mar 18, 2019, 2:08 AM

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ive never actually used widget components so im not sure

cedar finch Mar 18, 2019, 2:09 AM

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hey I'll give it a try lol

graceful cave Mar 18, 2019, 2:09 AM

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on begin play on the character you can set the player state variable

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on the widget

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would be the same thing

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but that might risk the player state not being set for all clients at the time they run beginplay

cedar finch Mar 18, 2019, 2:10 AM

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Yea that was my issue before with beginplay. Critical info that clients need wasn't set yet

graceful cave Mar 18, 2019, 2:11 AM

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well a dirty but effective solution is to create an onRep player state variable that the server sets to the character's player state

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and have clients set the widget's player state variable in the onRep function

cedar finch Mar 18, 2019, 2:13 AM

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I might have to do that because the get parent actor doesn't work. https://i.gyazo.com/399f4581649a22e3cffcdfc3484d55bc.png

graceful cave Mar 18, 2019, 2:15 AM

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im about to go to bed so i cant open my editor to test but

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in the widget

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maybe you can cast "self" to "widget component" and maybe that has the proper context to call getparentactor

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or in other words find a way to get a widget component from a widget because that cast will probably fail

cedar finch Mar 18, 2019, 2:18 AM

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ok. And if that doesn't work I can try what you said earlier. Which was make a playerstate variable inside my Playerstate. Then in my playercontroller set that variable to my playerstate. Then do the widget setting of the variable inside the RepNotify?

graceful cave Mar 18, 2019, 2:19 AM

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on the character, create a RepNotify player state variable that the server will set to the actual result of GetPlayerState

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and in the onRep function, clients can set the value of a PlayerState variable on the widget to the newly replicated player state

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and in the GetPlayerName function on the widget, cast that player state to the ones youre using in there

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dont use controller at all for it

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controllers only exist on the owning client and the server

digital wigeon Mar 18, 2019, 2:43 AM

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I am trying to build my game's dedicated server following this guide: https://wiki.unrealengine.com/Dedicated_Server_Guide_(Windows_%26_Linux)
but when I get to the part where I need build it for development server, no .exe is generated, and this is the output:

1>------ Skipped Build: Project: ShaderCompileWorker, Configuration: Invalid x64 ------ 1>Project not selected to build for this solution configuration 2>------ Build started: Project: TestGame, Configuration: Invalid Win32 ------ 2>The selected platform/configuration is not valid for this target. ========== Build: 1 succeeded, 0 failed, 2 up-to-date, 1 skipped ==========

Dedicated_Server_Guide_(Windows_%26_Linux)

worthy perch Mar 18, 2019, 2:57 AM

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I don't recognize that problem, but you sure you properly set your solution configuration?

digital wigeon Mar 18, 2019, 3:05 AM

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In VS: "Development Server" "Win64" "TestGame"
Right clicking on "TestGame" and hitting "build" with that configuration

worthy perch Mar 18, 2019, 3:09 AM

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"Development Server" "Win64" "TestGame"
Is TestGame the Startup Project? If so, can you select UnrealBuildTool?

digital wigeon Mar 18, 2019, 3:19 AM

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Yes I can

worthy perch Mar 18, 2019, 3:20 AM

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Yeah, try that.

digital wigeon Mar 18, 2019, 3:20 AM

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Same error

worthy perch Mar 18, 2019, 3:21 AM

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You have a TestGameServer.Target.cs?

digital wigeon Mar 18, 2019, 3:22 AM

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Yes, in the /Source/ folder, with contents
`// Copyright 1998-2018 Epic Games, Inc. All Rights Reserved.

using UnrealBuildTool;
using System.Collections.Generic;

[SupportedPlatforms(UnrealPlatformClass.Server)]
public class TestGameServerTarget : TargetRules
{
public TestGameServerTarget(TargetInfo Target) : base(Target)
{
Type = TargetType.Server;
ExtraModuleNames.Add("TestGame");
}
}`

worthy perch Mar 18, 2019, 3:29 AM

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Hmm, I searched the 2>The selected platform/configuration is not valid for this target. on this Discord, and someone else had the same problem and he solved it. He didn't say how, though. You could ask him.

safe marsh Mar 18, 2019, 4:08 AM

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doing some debugging using the PIE gamemode

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when I launch the game with dedicated server enabled, they both load up the same map

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is there some way to get the dedicated server to load into another map? seems like the project settings default maps override doesnt work for the PIE dedicated server

digital wigeon Mar 18, 2019, 5:07 AM

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@timber anchor Saw you had the same issue as me with the dedicated server. What did you do to fix it?

trail oar Mar 18, 2019, 5:35 AM

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I'm building a client multiplayer game and I am attempting to set a custom depth on an actor. The event is set to replicate on owning clients and all connected clients can set it fine, however when I the server's client triggers the event it triggers for all clients. Is there any way to have it only show for the server and not the connected clients?

cedar finch Mar 18, 2019, 6:35 AM

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@graceful cave I got it working. 😃 I took your advice and tweaked it. I created a variable inside my ThirdPersonCharacter called "NameOfPlayer" and set it to RepNotify. I then created an event inside my Gamemode that gets the Name from Playerstate and passes it to the ThirdPersonCharacter which then sets the "NameOfPlayer" variable to the same one in Playerstate. Then the Repnotify gets the actual widget and sets the Text inside to the "NameOfPlayer". Then I can just call the UpdatePlayerName event that's inside gamemode whenever/wherever I want if I need to update. I'm sure this probably isn't the best way to do it but It works and It makes sense to me lol. https://i.gyazo.com/c4b303a0e79efaf1312866939416b211.png https://i.gyazo.com/52ae5fafb5d8330847cb0f20cc7d3f26.png https://i.gyazo.com/89e5f9bb8a79c18fe1038cd995d61fff.png

mild forge Mar 18, 2019, 6:43 AM

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I am confused with bOrientRotationToMovement. If I set it to true, does it mean when I press keys to move my ship character toward right, it'll also turn its direction to face right, and the rotation be replicated to other clients and server?

cedar finch Mar 18, 2019, 6:58 AM

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I use "Set View Target With Blend" for my spectating system to spectate teammates while your dead. My problem is that the rotation is off when I'm spectating. As a spectator I'm locked to one view and don't rotate with the person I'm spectating. Any ideas on how to fix this? https://gyazo.com/c14a763baa4a1d383aa32b37d5f306b3

Gyazo

▶ Play video

hoary spear Mar 18, 2019, 9:17 AM

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maybe attach a springarm and spectatorcam on the players?

thin stratus Mar 18, 2019, 9:36 AM

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The Viewtarget is most likely already that

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Problem is most likely that the SpringArm listens to ControlRotation

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And that's not given by the player you spectate

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You'll have to get their rotation by hand and apply it

timber anchor Mar 18, 2019, 9:50 AM

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@digital wigeon You've to select the plattform before build it, otherwise i suggest to use Unreal Front End Client that it's easier to use!

pure abyss Mar 18, 2019, 11:10 AM

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@thin stratus If I have let say a class that inherit from UOnlineBlueprintCallProxyBase, when does the activate going to be called?

thin stratus Mar 18, 2019, 11:24 AM

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When you call the node

real yacht Mar 18, 2019, 11:43 AM

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is OpenLevel correct way to connect on dedicated server?

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open level with ip address as argument

bitter oriole Mar 18, 2019, 11:44 AM

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That's one way

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Most games would use sessions instead of direct IPs

real yacht Mar 18, 2019, 11:45 AM

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yes, i'm just testing some features in team without sessions

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should i provide only ip, or ip and port?

bitter oriole Mar 18, 2019, 11:47 AM

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Haven't used IPs in a while but no port should default to the default port, and you can force a different port

real yacht Mar 18, 2019, 11:59 AM

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so when dedicated server is up, default port is 7778

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?

bitter oriole Mar 18, 2019, 12:04 PM

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7777

pure abyss Mar 18, 2019, 12:24 PM

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@thin stratus Have you ever worked with gamesparks? I still can't find anything on their code that call this Activate function

white fable Mar 18, 2019, 12:28 PM

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Does anyone know how to get voip working online when connecting to a server via IP? From what I understand voip only works for clients that are in a session, so I was wondering if there's an alternative when connecting via IP (no sessions). Thanks

thin stratus Mar 18, 2019, 12:49 PM

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@pure abyss The function is called via the parent class you inherit from

idle flame Mar 18, 2019, 1:37 PM

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Someone know if we can do template rpc function ?

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I've try but I have some compile error

fleet raven Mar 18, 2019, 1:42 PM

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no

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need to write each variant you want for uht to parse it

idle flame Mar 18, 2019, 1:43 PM

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The only solution to send a typename over network is to make an enum and a switch case ?

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nice xD

bitter oriole Mar 18, 2019, 1:43 PM

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UClass might work

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Not that I've tried it

fleet raven Mar 18, 2019, 1:44 PM

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enum is probably best if you can use it

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will use less bandwidth

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but you can't always do that

idle flame Mar 18, 2019, 1:44 PM

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Well I'll do that

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thx

chrome bay Mar 18, 2019, 1:47 PM

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yeah you can send a UCLASS class if you like, TSubclassOf is supported

fleet raven Mar 18, 2019, 1:51 PM

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that's going to send the full name though

chrome bay Mar 18, 2019, 1:56 PM

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yeah, definitely unadvisable.

idle flame Mar 18, 2019, 1:57 PM

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I'll try with enum but I'll switch to uclass if needed thx

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I have an other question :

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I'm trying to send an information from server to client but I don't know how to do it :

My client (in PlayerController) is calling a function (UFUNCTION(Server, Reliable)) executed on the server.
On the server, in this called function I want to execute a netmulticast.
In this netmulticate I would like to send as parameter which playerController has perform the initial call on the server.

Someone know how can I do that ?

What I've got

Controller


void AMazeLegendsPlayerController::AddComponentOwner_Implementation(const uint32 id, AMazeLegendsPlayerController* controller)
{
    // Id is use for something else.
 
    // how can I know if the controller received is the good one ?
}

void AMazeLegendsPlayerController::LootItem_Implementation(const uint32 id)
{
    if (SOME CHECK) {
        AddComponentOwner(id, this); // the controller sent is the local on on the server ?
    }
}

    // Initial function call from client executed on server
    UFUNCTION(Server, Reliable, WithValidation)
    void LootItem(const uint32 id);

    // Other function call on server but execute by all clients
    UFUNCTION(Netmulticast, Reliable)
    void AddComponentOwner(const uint32 id, AMazeLegendsPlayerController *controller);

chrome bay Mar 18, 2019, 1:58 PM

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There's no point

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The clients don't have the controller locally, so the pointer will just resolve to null

idle flame Mar 18, 2019, 1:58 PM

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ah

chrome bay Mar 18, 2019, 1:58 PM

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You want to use a PlayerState pointer if you want to let clients know something about another player

idle flame Mar 18, 2019, 1:59 PM

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So I could do that with characters ?

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pointer would work over the network ?

chrome bay Mar 18, 2019, 1:59 PM

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Characters would so long as they are currently relevant

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Which ofc you can't garauntee if you're using net relevancy

idle flame Mar 18, 2019, 2:00 PM

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Well I'll use PlayerState thx

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but how the client can have the same pointer as the server on a playerState ?

chrome bay Mar 18, 2019, 2:01 PM

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under the hood it's all resolved through an ID that is synced

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If it's a dynamically spawned actor they can be resolved by ID, if it's an actor placed in the map it can be resolved by name since the maps are identical both sides

idle flame Mar 18, 2019, 2:02 PM

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So is it better to only send the id ? or is it already done ?

chrome bay Mar 18, 2019, 2:02 PM

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you can't get the ID

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It's all hidden away under the networking in UE4

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It's the Network ID I should add - which doesn't necessarily match up with any of the other ID's

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But when you send a pointer to an object via RPC, the actual RPC unreal sends uses the network ID of the object, then on the client they find their local copy of the object which uses that ID

idle flame Mar 18, 2019, 2:04 PM

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Ok that clean

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thx @chrome bay

chrome bay Mar 18, 2019, 2:04 PM

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np's

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Have a look at FNetBitReader / FNetBitWriter and you can sort of see how it works

idle flame Mar 18, 2019, 2:05 PM

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I'll check that thx

tardy cosmos Mar 18, 2019, 2:14 PM

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If I want to change the target view of a player controller in a client, should I change it on the server in order to change the camera on the client?

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I am still learning how to use mp bp, so there are some concepts that I am not understanding. Right now I am able to start server/client and a client and run a basic level. However I am trying to use "Set view target with blend" to change the camera for the player that is in the server and for the player in the client.

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But I am still confused if I can execute the event on the client and automatically it is going to replicate on the server, or I should make it on the server and automatically it would replicate on the client.

heady delta Mar 18, 2019, 2:45 PM

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https://www.unrealengine.com/marketplace/en-US/smooth-sync

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I don't understand this

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Is it like an unsecure movement component or something?

bitter oriole Mar 18, 2019, 2:48 PM

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@heady delta "replicate location" on objects doesn't really work for moving objects, so this adds interpolation

heady delta Mar 18, 2019, 2:52 PM

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ahh yeah, would be interesting to test with character movement interacting with a physics object replicated using this, since thats where things usually go awry

bitter oriole Mar 18, 2019, 3:01 PM

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Physics aren't going to work out

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Overall, MP physics in UE4 aren't feasible

heady delta Mar 18, 2019, 4:16 PM

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there are some hacky ways to get away with some simple MP physics like barrels etc

bitter oriole Mar 18, 2019, 4:23 PM

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Anything like MP physics in UE4 is going to come with heavy restrictions

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Fully client authoritative, for example, or using your own physics

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Or very liberal re: server vs client

fleet raven Mar 18, 2019, 4:24 PM

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to be fair, mp physics is a giant hack on every engine

bitter oriole Mar 18, 2019, 4:25 PM

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A deterministic physics engine goes a long way

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Look at Source Engine

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The MP physics were absolutely stellar

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And that was 15 years ago

pallid mesa Mar 18, 2019, 4:26 PM

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well... well well

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if you guys speak about traditional physics of objects falling because the sake of it

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or just simulations, that's the hard part, usually as stranger said, deterministic physics

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but otherwise, for vehicles and stuff

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client auth seems the way to go

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trust and verify all the way long

bitter oriole Mar 18, 2019, 4:27 PM

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I'm legit curious as to how physics props were handled in Source

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Because you could pick up half the props in levels and throw them around

pallid mesa Mar 18, 2019, 4:28 PM

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what I want to know... is the specific details on the destruction engine they pulled of on R6Siege

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those things they didn't say on their GDC presentation

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like... all these things implying physics and deterministic graphs are so cool

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and the resources online are limited

heady delta Mar 18, 2019, 4:30 PM

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in source engine there were a few different types of physics, but mainly any physics object that was replicated, was not so interactable

pallid mesa Mar 18, 2019, 4:30 PM

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I guess it could be a mixture between traditional techniques (spline calculation given a start and an end point) and client interpretation

heady delta Mar 18, 2019, 4:31 PM

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you could set the physics prop to be client only or server in a way, and a server barrel would push the player away, and you couldn't stand on it, kinda like how I do it apart from having the barel push the player away

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so there was some leway there

bitter oriole Mar 18, 2019, 4:31 PM

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Source broke up physics objects by size, replicating only the largest, player collision affecting

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However you could still pick up a broken toilet seat and kill a player 50m away with it, accurately

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I wish that stuff was possible in UE4

heady delta Mar 18, 2019, 4:32 PM

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at that point the toilet seat becomes a projectile weapon haha

bitter oriole Mar 18, 2019, 4:32 PM

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It wasn't handled as a weapon though

pallid mesa Mar 18, 2019, 4:33 PM

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is the object representation accurate in every client end?

bitter oriole Mar 18, 2019, 4:33 PM

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For large objects yes

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i.e. objects that you could pick up

heady delta Mar 18, 2019, 4:34 PM

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I use projectile movement for barrels essentially you can blow them around like projectiles, but you just can't stand on them, and the player has an additional collision capsule just for physics so phsyics objects can't affect the player movement, but the player movement can affect the physics

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kinda hacky but it works and its smooth

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did source have any prediction on deterministic physics going on? I know the grenades were

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but just random objects

bitter oriole Mar 18, 2019, 4:36 PM

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I legit don't know, but my guess is, regular prediction + rollback, for every gameplay affecting physics object

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Which isn't that much an issue once you have a A) deteministic physics engine that B) you can step and rollback independently

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PhysX having neither of these features

heady delta Mar 18, 2019, 4:37 PM

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yeah thats true

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once you run a client on two seperate computers, the simulations almost always return different results

bitter oriole Mar 18, 2019, 4:38 PM

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Yeah. My current project has physics gameplay (somewhat) and i'm sticking with custom physics

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Unfortunately that means the physics suck a bit

heady delta Mar 18, 2019, 4:40 PM

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to think when hl2 came out we all though physics everything was just how its going to be haha

bitter oriole Mar 18, 2019, 4:40 PM

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Turns out physics can work in dedicated games but don't bring enjoyment in most games

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HL² Deathmatch had me giddy killing my friends with toilet seats, but not every shooter needs or benefits from that

heady delta Mar 18, 2019, 4:41 PM

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well just little stuff, most games seem to be doing things like foliage interaction with shaders, when say crysis was doing skeletal foliage

pallid mesa Mar 18, 2019, 4:48 PM

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what kind of physics are you dealing with? @bitter oriole

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just out of curiosity

ivory portal Mar 18, 2019, 4:48 PM

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I've got a problem I am currently using GameLift. My server standard map is named "GamingField" and the client standard map is MainMenu. In MainMenu the client isn't connected yet to the server but will do an open-level to the server after searching for a game-session and receiving his player-session. In my logs I see the following

LogGameLift: [UGameLiftClientObject::CreateGameLiftObject] CreateGameLiftObject
LogBlueprintUserMessages: [UI_MainMenuLobby_C_0] Search Game Sessions: 1
LogBlueprintUserMessages: [UI_MainMenuLobby_C_0] 18.197.15.16:7777
LogNet: Browse: 18.197.15.16//Game/Maps/MainMenu

So my open-level is trying to open MainMenu on the server (which hasn't been packaged with it because the server doesn't need mainmenu?) while I always thought that the server would tell connecting clients to connect to his map?

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so now nothing happens and in gamelift dashboard I see the clients timing out

bitter oriole Mar 18, 2019, 4:58 PM

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@pallid mesa Vehicle.

inland pond Mar 18, 2019, 7:11 PM

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Is there a better way to inform a playercontroller about another playerstate updated a variable? Currently I use a function inside the GameMode which tell every registered playercontroller that the playerstate updated and gets called from the PlayerController who had updateded its PlayerState. For example the GameState does contain all PlayerStates in an array and I was wondering if its a better method to poll this array every 2 or 1 seconds. This would remove the function call trace and would make it less complicated I think.

worthy perch Mar 18, 2019, 7:12 PM

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There's RepNotify/OnRep stuff.

plucky horizon Mar 18, 2019, 7:22 PM

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Can UE4 launch a standalone server + client pair? Similar to how the New Editor Window (PIE) option does, with it's auto-connect option?

weary mortar Mar 18, 2019, 7:42 PM

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Hi there... I have an X-File.... I broadcast an event in server and client in the OnRep method of a variable.... and in the AnimBP I use that event to play an Animation Montage. Server plays it OK, but Client doesn't..... but the weirdest thing is that Animation Montage return != 0 in both cases!! is there any known issue about replication+multicast+animation montage??

idle flame Mar 18, 2019, 8:00 PM

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Someone know why a netmulticast function called by server from client-owned actor is not execute on all clients ? Aren't multicast function executed on all clients in my case ?

winged badger Mar 18, 2019, 9:47 PM

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@weary mortar how many times do you call PlayMontage when client side?

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@idle flame all Multicasts done Server side will execute on all, as long as the Actor that contains the RPC is replicated

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@plucky horizon if you do into settings for Play, and uncheck "Use Single Process" Unreal will launch one of them as standalone and play another from PIE (you can configure which)

plucky horizon Mar 18, 2019, 9:52 PM

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thanks @winged badger
So much better now being able to view logs separately

winged badger Mar 18, 2019, 9:53 PM

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@inland pond an event dispatcher in your GameState the PCs subscribe to, and is broadcast from Setter(OnRep is sufficient for BP) for that PS variable

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having PCs subscribe directly to the PS dispatcher would be a abit of a pain, as you'd need to handle new players logging in

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it should have the PlayerState reference and the NewValue as payload

plucky horizon Mar 18, 2019, 9:54 PM

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I've been trying to figure out this problem for most of the day. On my client, my PlayerController is totally useless. The Controlled Pawn is null, and I can't understand why. I print logs for possessing and unpossessing, but I only have a possession event.
https://i.imgur.com/8OFzl1i.png

Imgur

winged badger Mar 18, 2019, 9:55 PM

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how do you spawn your Pawns?

plucky horizon Mar 18, 2019, 9:56 PM

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Well actually, I can't say that. The Camera Boom is null, but it is set inside the possession event.

winged badger Mar 18, 2019, 9:56 PM

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you can also use the illuminati eye bottom right of the World Outliner to pick which world are you looking at (clientX, Server)

plucky horizon Mar 18, 2019, 9:56 PM

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I spawn my pawns with a player start. Is that what you mean?

winged badger Mar 18, 2019, 9:56 PM

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no, i mean how do you spawn them?

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do you leave it to the engine with default pawn class set?

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do you spawn them manually?

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do you spawn them client side? would be pretty bad if you did

plucky horizon Mar 18, 2019, 9:58 PM

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I have an INA_PawnBase which I inherit into BP_INA_Pawn.
Everything else is left up to the engine (99% sure about that)

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I haven't written any code for spawning pawns, all I do is place a player start. Set my pawns to always spawn+adjust position to make it happen. Then I hit play and the engine spawns them.

winged badger Mar 18, 2019, 10:00 PM

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and your DEfaultPawn class in GameMode is set?

plucky horizon Mar 18, 2019, 10:00 PM

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Yep, so is the controller

inland pond Mar 18, 2019, 10:01 PM

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@winged badger thanks thats sound good!

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But what about Ping and those stuff which is already there as variable inside the PlayerState?

winged badger Mar 18, 2019, 10:04 PM

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what specifically?

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and i don't think you'd have Ping replicated

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as its largely useless info, whats the ping for other players

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Any LogSpawn entries @plucky horizon ? in your Output, after it fails

plucky horizon Mar 18, 2019, 10:05 PM

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Not sure but I just found something super useful out about the client side

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The controller isn't spawning or isn't possessing a pawn.

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I didn't realize before because I was still looking at the merged logs.

winged badger Mar 18, 2019, 10:06 PM

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it might be something as simple as Pawn not being replicated

plucky horizon Mar 18, 2019, 10:06 PM

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The pawn is replicated, I can see it

winged badger Mar 18, 2019, 10:06 PM

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so you do have both Pawns client side?

plucky horizon Mar 18, 2019, 10:07 PM

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yep

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I don't want the controllers to replicate do I?
I have all my input done on the controller blueprint.

winged badger Mar 18, 2019, 10:09 PM

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you should not touch the replication settings on PlayerControllers at this time 😄

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i have not used the default engine handling for spawning players in years

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you can try overriding the HandleStartingNewPlayer in your GameMode

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it has a PC reference

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then SpawnActor of your Pawn class from there (use FindPlayerStart function for location/transform), and Possess it

inland pond Mar 18, 2019, 10:14 PM

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Uhm okay, the docs says that ping is replicated "Replicated compressed ping for this player". I wanted to create a Info about the current connected players which will show a ping bar for each. As far as I have understand you correct I would use rep notify for each variable and this function would emit the dispatcher. I was just wondering about already defined variables inside the BasePlayerState on using the onrep functionality.

winged badger Mar 18, 2019, 10:15 PM

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DOREPLIFETIME_CONDITION( APlayerState, Ping, COND_SkipOwner );

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fair enough, it does replicate to other clients

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    /**
     * Receives ping updates for the client (both clientside and serverside), from the net driver
     * NOTE: This updates much more frequently clientside, thus the clientside ping will often be different to what the server displays
     */
    virtual void UpdatePing(float InPing);

    /** Recalculates the replicated Ping value once per second (both clientside and serverside), based upon collected ping data */
    virtual void RecalculateAvgPing();

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both of these are virtual

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so you can override them, call super and Broadcast a delegate

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it doesn't have OnRep notifications tho

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so you might get stuck with running an update function that queries PlayerArray on timer

inland pond Mar 18, 2019, 10:22 PM

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Yea I think this is the way I will go anyway thanks for the information

plucky horizon Mar 18, 2019, 10:22 PM

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I fixed the issue by tacking on some code in the Controller's blueprint to set the CameraBoom when it is detected to be null. This fixes the client side controller.

However pawn movement isn't being replicated to the server =/
I should note that the server's pawn moment is replicated to the client though

winged badger Mar 18, 2019, 10:23 PM

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WASD?

plucky horizon Mar 18, 2019, 10:25 PM

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I am using wasd yes, I have it setup as axis input though.

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https://i.imgur.com/hV4krgV.png

Imgur

winged badger Mar 18, 2019, 10:26 PM

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the blueprint part?

plucky horizon Mar 18, 2019, 10:26 PM

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https://i.imgur.com/YYkj4e5.png

Imgur

winged badger Mar 18, 2019, 10:27 PM

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go through AddMovementInput

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i think from Pawn reference

plucky horizon Mar 18, 2019, 10:27 PM

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It is yea, it didn't work either =/

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I'll switch back tho

winged badger Mar 18, 2019, 10:27 PM

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and you have GetRightVector, you don't need to cross the Forward and Up

plucky horizon Mar 18, 2019, 10:29 PM

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XD lol awesome

winged badger Mar 18, 2019, 10:29 PM

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what does the IsValid macro do?

plucky horizon Mar 18, 2019, 10:30 PM

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checks if CameraBoom is null, and gets it from the Pawn if it is

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need to rename it since it does more than check if it is valid now

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It is pretty gross, but it fixes the controller not working on the client.
https://i.imgur.com/CAsAULf.png

Imgur

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I basically gotta run that first on all of my inputs 🤢

winged badger Mar 18, 2019, 10:34 PM

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or make a camera boom that can't fail

plucky horizon Mar 18, 2019, 10:34 PM

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It isn't the Boom that's failing though

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It is the client controller, somehow it is possessing a pawn without calling APlayerController::Possess

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

Imgur

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Server is on the left, client on the right

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The purple line is the possession event

winged badger Mar 18, 2019, 10:38 PM

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Possess only happens on server

plucky horizon Mar 18, 2019, 10:39 PM

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uhmm.. ok? why?

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😕

winged badger Mar 18, 2019, 10:39 PM

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replication handles the client side

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Controller, Pawn, Owner...

plucky horizon Mar 18, 2019, 10:39 PM

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so.. basically I need to set my CameraBoom property to replicated then.

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That doesn't resolve the client -> server movement replication though

thin stratus Mar 18, 2019, 10:40 PM

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Why though?

plucky horizon Mar 18, 2019, 10:40 PM

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crap, I got a lab exam in 10 minutes

thin stratus Mar 18, 2019, 10:40 PM

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The CameraBoom is controlled by the Client

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The Input stuff comes from the Client

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Why would it need to be replicated?

plucky horizon Mar 18, 2019, 10:40 PM

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the server doesn't acknowledge that input

winged badger Mar 18, 2019, 10:40 PM

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also, DefaultSubobjects on replicated Actor do not need to be replicated in general

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only if they themselves contain custom network code

thin stratus Mar 18, 2019, 10:41 PM

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The only reason you'd require this to be replicated is if you need a Client, that doesn't have the controller of another client, to see the same camera movement. E.g. when spectating

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And for that you have other functions

plucky horizon Mar 18, 2019, 10:41 PM

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UCLASS()
class INDRADESIGN_API AINA_PawnController : public APlayerController
{
    GENERATED_BODY()

private:
    UPROPERTY(Category = ".INA-PawnController", VisibleAnywhere, BlueprintReadWrite, meta = (AllowPrivateAccess = "true"))
    USpringArmComponent* CameraBoom = nullptr;

This though, is what I mean I need to replicate. I didn't know Possess only happens on the server

thin stratus Mar 18, 2019, 10:42 PM

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The PlayerController shouldn't have a SpringArm

plucky horizon Mar 18, 2019, 10:42 PM

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it has a pointer to one

thin stratus Mar 18, 2019, 10:42 PM

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This should sit on the Character

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Right

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Why though?

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You can handle input through the Character directly

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Makes a lot more sense

plucky horizon Mar 18, 2019, 10:42 PM

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cause I felt like it, I don't have time to argue minute decisions like this

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I gotta go pretty soon

thin stratus Mar 18, 2019, 10:43 PM

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Well then adjust it to what UE4 expects you to have :P

plucky horizon Mar 18, 2019, 10:43 PM

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If you have advice on how to fix the movement issue, that'd be cool. I can't read it right now though

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thanks for all the help @winged badger

thin stratus Mar 18, 2019, 10:43 PM

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Yeah handle the movement in the Character, as it's moving the character

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That's all :P

plucky horizon Mar 18, 2019, 10:44 PM

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the controller "controls" the character

thin stratus Mar 18, 2019, 10:44 PM

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Yeah, that doesn't mean the Input can't be in the Character

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UE4 is designed around having Character specific input and controls in the Character class

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And more generic, non-character specific input in the Controller

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Such as "open menu"

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Not that I wouldn't work from the PlayerController, but with that logic you could control it from the HUD Class too :P

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Just to be 100% sure though, you are working with a Character, not a Pawn or?

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Cause the Pawn doesn't have replicated movement, despite literally setting the location and rotation to whatever comes in

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Without any interpolation and such

plucky horizon Mar 18, 2019, 10:50 PM

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My exam is a bit late starting.
I am working with pawns

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I think it makes more sense for my game to not consider implementing input directly on any actors

thin stratus Mar 18, 2019, 10:53 PM

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That's up to you. Can only tell you how the Framework of UE4 is setup

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If you don't want to follow that, your choice.
However the problem of the Pawn and the UPawnMovementComponent not providing proper Replication for online movement, is a thing.
You can always tick the "ReplicateMovement" on the Pawn Actor, but it won't compensate any lag.

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And I'm also pretty sure it doesn't support any ClientSide "AddInputVector"

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Cause that is never replicated in the PawnMovementComponent

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You have to do that yourself

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To be even more precise about the PawnMovementComponent -> It doesn't even handle movement

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All it does is giving you a base to build up on

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https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/Engine/Private/Components/PawnMovementComponent.cpp

plucky horizon Mar 18, 2019, 10:56 PM

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I do have that ticked, and movement is not replicated. I guess ill need to disect the movement component later

thin stratus Mar 18, 2019, 10:56 PM

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It is not doing anything with that vector you are adding

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It also has no network support

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You are adding that Vector and it is never used

plucky horizon Mar 18, 2019, 10:57 PM

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I see.

thin stratus Mar 18, 2019, 10:57 PM

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That stuff only comes with the CharacterMovementComponent

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Or if you write your own

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And the CMC requires a Character, not a Pawn of course

plucky horizon Mar 18, 2019, 10:57 PM

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Alright at least I know the place to look now. Is there a character move comp? Or is it donedirectly in he character?

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Gtg

thin stratus Mar 18, 2019, 10:58 PM

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The Character has a CharacterMovementComponent attached

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They only work together

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The CMC does not work with a pawn class

odd scaffold Mar 18, 2019, 10:58 PM

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Hello guys, I am currently following a tutorial that does implementation of multiplayer for steam but I didn't quite understand this:
When a player creates a session and hosts a game through Steam, is it the same as hosting a LAN match through hamachi for example?

thin stratus Mar 18, 2019, 11:00 PM

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No

odd scaffold Mar 18, 2019, 11:00 PM

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I am asking because I am wondering about the performance/latency for fast paced game

thin stratus Mar 18, 2019, 11:00 PM

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In a LAN, if you host a Server you basically wait for people to ask "Hey, do you host a Server?"

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It's done like that cause LANs are usually small

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An online Session on Steam is register on a central (more or less) Master Server

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That Server keeps track of all Sessions of your AppID

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And if someone wants a ServerList, they ask the MasterServer and get the List.

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Sessions have nothing to do with Performance and Latency

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Performance is up to your game

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And Latency, partially too

odd scaffold Mar 18, 2019, 11:01 PM

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So it's like a dedicated server but I don't have to make a dedicated server?

thin stratus Mar 18, 2019, 11:01 PM

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And partially based on where Host and Clients are located

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:P You are throwing words around

odd scaffold Mar 18, 2019, 11:02 PM

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haha

thin stratus Mar 18, 2019, 11:02 PM

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DedicatedServer != MasterServer

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A UE4 game can be hosted in two ways

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As a ListenServer

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Or as a DedicatedServer

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Both can register a Session on the MasterServer

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The difference is that a ListenServer is a Client that hosts the game and is basically both, server and client

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And a DedicatedServer is a standalone server, that just sits on a some PC, with just a console representing it.

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It has no client and it can exist without any client on them

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While the ListenServer goes off if the hosting client leaves

odd scaffold Mar 18, 2019, 11:03 PM

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Yeah, got it

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So I shouldn't worry about fast moving characters not getting updated frequently enough? It just depends on the hosts internet quality and latency of other players?

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If I create a game around ListenServer mechanic

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Thank you very much for the answers by the way. This isn't the first time that you are answering my questions

thin stratus Mar 18, 2019, 11:09 PM

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Yop, it's still tricky to get a fast moving character replicated, but that has not a lot to do with the session stuff

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If you host has a bad connection then everything is over anyway :D

odd scaffold Mar 18, 2019, 11:10 PM

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Of course

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Two more short questions and I won't bore you anymore :). I searched last night all night but couldn't find a proper answer. My question has to do with server tick rate.
I have found some people saying that default server tick rate for Unreal is 40 Hz and some people are saying 60 Hz.
Do you know which one is the default and are there any downsides to running server in more than 60 Hz except more CPU usage?
Can a standard internet connection handle let's say 80 Hz? By standard I mean like 10 Mb/s upload and a decent provider

thin stratus Mar 18, 2019, 11:20 PM

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Actually not sure, could also be a tick rate of 30. You can adjust that if you need to. Don't have the ini file stuff at hand for that though.
It just means how often your server will send an update. If you can handle more than set it higher, otherwise keep it lower.
Your goal is to save bandwith, not to use as much as possible.
Which brings us to the second question, no idea. It also depends on how much stuff you actually replicate.
10Mb/s is a lot, doubt that a lot of people have that. Wouldn't see that as standard.

odd scaffold Mar 18, 2019, 11:21 PM

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Okay. Once again, thank you very much for taking your time to answer me 😄

twin minnow Mar 18, 2019, 11:26 PM

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hey yall, I posted this in the work-in-progress, but also wanted to post this here as well. I've seen a lot of questions regarding gamelift and I've had my fair share of roadblocks as well so I made a very simple tutorial on how to integrate unreal with gamelift. here's the link: https://www.youtube.com/watch?v=Iq2LpwXogTw

YouTube

Flopperam

How to host a Unreal Engine Dedicated Server on Amazon Gamelift (P...

PART 2: https://youtu.be/2I8JDeMGkgc In this tutorial, we're going to show you how to host a Unreal Engine dedicated server on Amazon Gamelift including all ...

▶ Play video

slender yarrow Mar 18, 2019, 11:31 PM

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does anyone know: is it normal for a client character to appear "laggy" to the host character? I have a sprint function on my character. Its smooth from the first person perspective on the client and host, but the 3rd person movement of the client appears laggy from the host first person view. Is this normal or possible incorrect code? By laggy i mean it looks like the character is moving in like 20-30fps not terrible, but noticeable

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actually the regular movement of the client looks laggy too. not just the sprint

thin stratus Mar 18, 2019, 11:39 PM

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https://issues.unrealengine.com/issue/UE-32005

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That?

slender yarrow Mar 18, 2019, 11:44 PM

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my terminology is bad but assuming listen server char is the client? then yes. When im looking at the client character on the host char he looks choppy

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so looks like dedicated is really the only way to go now

fresh saddle Mar 18, 2019, 11:54 PM

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I have a question I was hoping somebody could help me out with. In a typical first person Multiplayer scenario: Would a Pick Up item spawn new items on the owning client for the first person and then spawn on all BUT the owning client for third person when its picked up or would it just do like a set mesh for a third person item thats set to Owner no see and set mesh on a first person item thats set to Owner only see?

Basically what I'm asking, is whats the best way to handle weapon/item pickups in a multiplayer scenario? haha

winged badger Mar 19, 2019, 2:47 AM

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you can do your first approach only if the item once picked up runs no network code whatsoever, and different collisions on owner/others is not an issue (or they have no collisions)

mild forge Mar 19, 2019, 2:51 AM

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If I want to spawn a simple projectile on server but it should be triggered at client side, a simple server rpc is enough to implement it?

winged badger Mar 19, 2019, 2:52 AM

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triggered client side as in?

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client tells the server to spawn the projectile?

mild forge Mar 19, 2019, 2:52 AM

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yes

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I was trying to do like this, but seems it's not working as I think

winged badger Mar 19, 2019, 2:53 AM

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it is enough, as long as the object that contains the RPC has local PC as NetOwner

mild forge Mar 19, 2019, 2:54 AM

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So I need a condition check? like ROLE == ROLE_Authority?

winged badger Mar 19, 2019, 2:54 AM

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otherwise, only thing you get is "No owning connection for... " warnings from LogNet

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no

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if its Role_Authority then Server RPC is just a normal function call

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you are trying to do this from within a... WeaponActor?

mild forge Mar 19, 2019, 2:57 AM

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No, just a simple ship character

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does I need to set the owner of the projectile as the character? I was thinking it's on the server and wont need an owner?

winged badger Mar 19, 2019, 2:59 AM

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no, the Owner of the Ship needs to be your PlayerController

mild forge Mar 19, 2019, 2:59 AM

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Yes, I mean owner of the projectile

winged badger Mar 19, 2019, 3:00 AM

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projectile's owner doesn't matter

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its spawned on server

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but unless PlayerController is Owner of the ShipCharacter

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ShipCharacter cannot send Server RPCs or receive Client RPCs

mild forge Mar 19, 2019, 3:02 AM

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The ShipCharacter is the default pawn class of the game mode, so i was assuming the owner of the ship is the default player controller.

winged badger Mar 19, 2019, 3:02 AM

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ok

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it is

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it has to be replicated, which i also assume it is

mild forge Mar 19, 2019, 3:03 AM

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Here's the ship character code: https://github.com/devfans/LandMaster/blob/master/Source/LandMaster/ShipCharacter.cpp

GitHub

devfans/LandMaster

Contribute to devfans/LandMaster development by creating an account on GitHub.

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yes

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The flow is Tick -> trigger FireShot Server RPC

winged badger Mar 19, 2019, 3:06 AM

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so what happens when you fire?

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does that log print?

mild forge Mar 19, 2019, 3:07 AM

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A projectile should be emitted on server, but it doesn't

winged badger Mar 19, 2019, 3:07 AM

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UE_LOG(LogTemp, Warning, TEXT("FireShot, can %b cached %b"), bCanFire, bCanFireCache);UE_LOG(LogTemp, Warning, TEXT("FireShot, can %b cached %b"), bCanFire, bCanFireCache);

mild forge Mar 19, 2019, 3:08 AM

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Seems this log does's show in message log

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But if run PIE in listen mode, the PIE side can spawn projectile and it's replicated to another client, however the other client can not spawn the projectile.

winged badger Mar 19, 2019, 3:10 AM

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then you have lognet warnings

mild forge Mar 19, 2019, 3:10 AM

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If checked the dedicated server, then none of them can spawn the projectile.

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The only warning i got in message logs is about AddImpulseAtLocation

winged badger Mar 19, 2019, 3:16 AM

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whats the declaration of FireShot?

mild forge Mar 19, 2019, 3:17 AM

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    UFUNCTION(Reliable, Server, WithValidation)
        void FireShot(FVector FireDirection);```

winged badger Mar 19, 2019, 3:22 AM

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it should at very least print the log

mild forge Mar 19, 2019, 3:24 AM

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yeah, it's weird no such a log.

winged badger Mar 19, 2019, 3:24 AM

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SetReplicates(true);

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do not use that in constructor

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void AActor::SetReplicates(bool bInReplicates)
{ 
    if (Role == ROLE_Authority)
    {
        if (bReplicates == false && bInReplicates == true)
        {
            if (UWorld* MyWorld = GetWorld())        // GetWorld will return NULL on CDO, FYI
            {
                MyWorld->AddNetworkActor(this);
            }
        }

        RemoteRole = (bInReplicates ? ROLE_SimulatedProxy : ROLE_None);
        bReplicates = bInReplicates;
    }
    else
    {
        UE_LOG(LogActor, Warning, TEXT("SetReplicates called on actor '%s' that is not valid for having its role modified."), *GetName());
    }
}

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there is no Role at the time of constnuction

mild forge Mar 19, 2019, 3:25 AM

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Oh, I will try to set the variable bReplicates directly and test

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Looks still same

winged badger Mar 19, 2019, 3:37 AM

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dunno, you might had broken it somewhere else

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hard to tell

mild forge Mar 19, 2019, 3:37 AM

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yeah, I will try to find the cause, thanks for your help.

winged badger Mar 19, 2019, 3:38 AM

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check if you broke the PlayerController

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its replication settings, forgot to call Super::BeginPlay() or some such

mild forge Mar 19, 2019, 3:39 AM

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ok, thanks

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It's working now, seems it's the firerate timer is not working somehow with the server.

halcyon cradle Mar 19, 2019, 4:22 AM

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hello, i have a mobile project and need to use voice, data and images between users, wich server would you recommend ?

cedar finch Mar 19, 2019, 5:18 AM

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I need help. I have a reload system and a sprint system. Right now I have it where you can't sprint while reloading which is fine, but I want to be able to cancel the reload if I start to sprint. How should I implement this? How do you cancel the reload that's already in progress?

halcyon cradle Mar 19, 2019, 5:21 AM

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wrong room but anyway , you could use a flag in your animationBP to stop the reload animation

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look at blend animation per bone

cedar finch Mar 19, 2019, 5:23 AM

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Yea the blueprint room is in a full discussion about something else lol. This is being replicated lol so It affects multiplayer. lol But my reload logic is in my character. Won't my gun still reload if I start sprinting even if the anim stops playing?

halcyon cradle Mar 19, 2019, 5:28 AM

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from your character you should have access to your character.animationBP and to your gun.animationBP ,

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so you can decide from there what animation to run at any moment by changing vars (flags) example gun.animationBP.gotoAnimationIdle

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gun.animationBP.gotoAnimationIdle = true

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check out any tutorial about animation blueprints and you will understand

cedar finch Mar 19, 2019, 5:54 AM

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@halcyon cradle Thanks man I got it working. 😃

halcyon cradle Mar 19, 2019, 5:54 AM

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great !

cedar finch Mar 19, 2019, 6:09 AM

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@halcyon cradle Or anyone else. You don't happen to know why in my spectating system using a "setViewTargetWithBlend" the Server player see's the person he's spectatings camera rotation correctly, but the Client when spectating cannot see the person he's spectatings camera rotation. The client simply follows the actors root. I believe Exo replied earlier and said I could get the rotation or something. But I feel like this is a replication issue if the Server player's is working but Clients is not.

cedar finch Mar 19, 2019, 6:42 AM

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See below: Every player is dead, even the server player. So they are all spectating the Top Right player. Notice how only the server can replicate the camera rotation. The others do not. https://i.gyazo.com/90cf13419433887cbe71356f23a2aff4.gif

fresh saddle Mar 19, 2019, 6:50 AM

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@cedar finch Is the Camera Component set to replicate? 🤔

cedar finch Mar 19, 2019, 6:58 AM

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@fresh saddle No but I just changed it and the springarm to replicate but it still does'nt work

tardy cosmos Mar 19, 2019, 8:25 AM

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I am having also probelams with this "setViewTargetWithBlend"

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What I have done, but probably totally unrelated, when I set the camera that I want to target, I add a delay just before the setViewTargetWithBlend

thin stratus Mar 19, 2019, 9:25 AM

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@cedar finch You are using control rotation for the SpringArm

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The ControlRotation only exists where Controllers exist

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The Character you Spectate has a Controller on the local client and the Server

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That's why it works for them

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You have to replicate this yourself or use something like "BaseAimRotation" and interp it

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(For the other clients)

rose egret Mar 19, 2019, 10:04 AM

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how u guys test your multiplayer game play codes? simulation using NetPktXXX seems not as the same as real internet

bitter oriole Mar 19, 2019, 10:06 AM

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Sorted by how often I use it : no particular setting, NetPktLag etc, real online test with multiple machines.

rose egret Mar 19, 2019, 10:06 AM

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the codes I worte work fine in local or lan cause its too fast and there is no lag and congestion

bitter oriole Mar 19, 2019, 10:06 AM

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People use Clumsy for that too

rose egret Mar 19, 2019, 10:09 AM

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I do have a dedicated machine but my upload speed is not good to upload the dedicated server every time

bitter oriole Mar 19, 2019, 10:13 AM

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In my experience NetPktLag alone is very helpful, but you can use Clumsy to have more advanced configurations. There's no replacement for actually testing online though

rose egret Mar 19, 2019, 10:14 AM

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I got an idea. I install UE4 and VS and sync my project repository with remote server.

bitter oriole Mar 19, 2019, 10:15 AM

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Sure, that's what I do too

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http://www.gamasutra.com/view/news/338719/Unity_partners_with_Havok_to_roll_out_new_physics_systems.php

Unity partners with Havok to roll out new physics systems

Unity has partnered with Microsoft-owned Havok to update its game engine with two new physics systems: one new default option and a 'high-end' option backed by Havok's proprietary physics engine.

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Cries in UE4

chrome bay Mar 19, 2019, 10:31 AM

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I really hope UE is moving more towards supporting more physics engines. I guess feature parity is a big problem though.

bitter oriole Mar 19, 2019, 10:45 AM

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I would be so happy if UE4 offered Bullet or even Havok

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As part of the engine, I mean. Havok can be used but $$$$$, IIRC

thin stratus Mar 19, 2019, 10:56 AM

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Anyone an idea how to make an Invisibilty effect in Splitscreen?

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Online I know enough ways how to hide a player from others

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But Splitscreen, where the Mesh and Actor you are seeing is the exact same instance the player is seeing, gives me a headache

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I can't hide anything as that hides it for the player itself

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I mean, I know that splitscreen would show the player anyway if you look into their side of the screen

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But it has to exist anyway

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I don't know if "OwnerOnlySee" works in Splitscreen

safe marsh Mar 19, 2019, 12:06 PM

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Hello, I want to create a persistent world. I have a dedicated server set up, I think it needs to interface with a database which will store clients information while they are disconnected. Does anyone know of any good learning resources for creating something like this?

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I can setup a database and send/retrieve serialized data through a tcp/udp socket, what kind of systems does ue4 have in place to handle that already?

real yacht Mar 19, 2019, 12:10 PM

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im using nodejs and mongodb

safe marsh Mar 19, 2019, 12:14 PM

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hmm ok

tardy cosmos Mar 19, 2019, 12:16 PM

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quick quick question. If I spawn an actor (with replicate enabled) on client side, it is going to spawn also on the server right?

safe marsh Mar 19, 2019, 12:20 PM

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Replication only works Server->Actor

tardy cosmos Mar 19, 2019, 12:21 PM

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thanks!

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I thought that it is also spawned on the server

safe marsh Mar 19, 2019, 12:22 PM

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make an RPC call for the server to spawn the actor on all clients

tardy cosmos Mar 19, 2019, 12:22 PM

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I think my setup is a RPC from the server to owning clients to spawn a camera (with replicate)

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And now I am not sure if I also have a copy of this camera on the server

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so it would be something like
Server -> client : Spawn camera ---> replicates the spawn on the server

safe marsh Mar 19, 2019, 12:27 PM

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If the camera is part of an actor hierarchy which is owned by a playercontroller, then the client owns it, it also exists on the server, but not other clients

thin stratus Mar 19, 2019, 12:27 PM

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Replication is Authority based

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Server spawns it, others spawn it too

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Client spawns it, no one else spawns it

tardy cosmos Mar 19, 2019, 12:30 PM

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Okey, i will check my setup then. Thanks a lot

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wait, so if I have a replicated variable and I modify it on the client side, it is going to change on server side? or this only works in one direction too?

graceful cave Mar 19, 2019, 12:39 PM

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any actor or component or variable set to replicate will only have changes reflected from server to client

tardy cosmos Mar 19, 2019, 12:40 PM

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I have to write this rule in my skin I guess

safe marsh Mar 19, 2019, 12:43 PM

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spawn things from a playercontroller/pawn/character class and it will only exist in the clients machine

graceful cave Mar 19, 2019, 12:44 PM

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if the server spawns actors from those classes and the spawned actor is set to replicate then it will spawn for everyone

safe marsh Mar 19, 2019, 12:44 PM

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yep, if it's a listen server it spawns a playercontroller, a dedicated server doesn't, right?

graceful cave Mar 19, 2019, 12:45 PM

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listen servers have a local player controller since there is a local player

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dedicated servers do not

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if a dedicated server tries to get player controller 0 then it will return the first player who joined

safe marsh Mar 19, 2019, 12:45 PM

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if it spawns an actor through that class, will it spawn it on all machines?

graceful cave Mar 19, 2019, 12:46 PM

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if the server spawns a replicated actor from anywhere then yeah it spawns on all machines

safe marsh Mar 19, 2019, 12:47 PM

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if it's non-replicated and it runs the spawn logic , will it only spawn on the server and owning client of the controller?

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I am also a networking noob btw 😄

graceful cave Mar 19, 2019, 12:47 PM

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if its not replicated then it wont replicate to anyone

safe marsh Mar 19, 2019, 12:48 PM

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so, is there some way to spawn it on just the server and owner? there is a RPC type called server/owner right, that does it?

graceful cave Mar 19, 2019, 12:49 PM

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im sure there is since player controllers only exist on the server and owning client, but ive never needed to do that so im not sure how you would do it

tardy cosmos Mar 19, 2019, 12:49 PM

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if I spawn an ActorA (replicate enabled) from an ActorB (which is not a playerController, pawn or character) in the server, it is going to replicate on clients?

graceful cave Mar 19, 2019, 12:49 PM

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you can control how variable replicate though

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@tardy cosmos right

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if server spawns an ActorA (replicate enabled) from anywhere at all, it will replicate to clients

tardy cosmos Mar 19, 2019, 12:51 PM

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and
ActorA (non-replicated enabled) from a PlayerController in the server, it is going to replicate to the clients?

safe marsh Mar 19, 2019, 12:51 PM

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I guess "run on owning client" is the one which runs on both server and client

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uh, the (1) client who owns the PC

graceful cave Mar 19, 2019, 12:51 PM

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if the server spawns a non replicated actor, it will not replicate to anyone and RPCs cant be called on it

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run on owning client only runs on the owning client

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owning client refers to any actor where the client's local player controller is the "Owner" of the actor

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so if server calls Run on Owning Client then only the owning client will run that function

safe marsh Mar 19, 2019, 12:53 PM

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if run on owning client spawns an actor, the server is aware of it ?

graceful cave Mar 19, 2019, 12:53 PM

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if client calls Run on Server and the client calling it is the Owner, then the server will run that, else nobody will

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the server is not aware of it

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if you want to spawn an actor from a client, the client needs to call a Run on Server RPC and have the server spawn it

safe marsh Mar 19, 2019, 12:54 PM

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right

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so run on server replicates the event to the server, both the owning client and server run it

tardy cosmos Mar 19, 2019, 12:55 PM

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then, RepNotify only makes sense from server to clients

safe marsh Mar 19, 2019, 12:55 PM

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and only they are aware of the existence of the newly created actor

graceful cave Mar 19, 2019, 12:55 PM

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@safe marsh only the server will run it

safe marsh Mar 19, 2019, 12:55 PM

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smh

graceful cave Mar 19, 2019, 12:55 PM

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and the client will be made aware of the new actor through the new actor's replication setting

safe marsh Mar 19, 2019, 12:56 PM

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how do you make an actor exist on just the PC it was spawned on and the server

graceful cave Mar 19, 2019, 12:56 PM

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@tardy cosmos RepNotify is the same as Replicated for variables but also triggers a function that everyone including the server will run

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its really optimized and offers better (but sometimes slower) net performance than RPCs

safe marsh Mar 19, 2019, 12:57 PM

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do you need two event calls?

graceful cave Mar 19, 2019, 12:57 PM

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but the main advantage is that newly connecting clients will receive all replicated variables when they connect and also run all RepNotify functions from them

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@safe marsh you could have them each spawn separately but then the server and client have two separate instances of the actor so replicated variables and RPCs wont work

safe marsh Mar 19, 2019, 12:58 PM

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ok thanks @graceful cave

graceful cave Mar 19, 2019, 12:58 PM

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im not sure what your goal is so i cant tell you the best method to do what youre trying to do

tardy cosmos Mar 19, 2019, 12:59 PM

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@graceful cave it feels more a disadvantatge, cozz if u want someone join in the middle of a session, you have to "replay" all the game until that moment

safe marsh Mar 19, 2019, 12:59 PM

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spawn an actor which only the owning client and server are aware of

graceful cave Mar 19, 2019, 12:59 PM

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you dont have to replay anything, they just get the current value of the variable from the server and run the onRep function

#

so if an item is spawned or has some specific state

#

like a player holding a specific gun or powerup

#

they will see it properly even though they werent connected when they entered that state

#

and RPC would not achieve that

tardy cosmos Mar 19, 2019, 1:00 PM

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so notifications stacks

safe marsh Mar 19, 2019, 1:06 PM

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@graceful cave how do I run an event on the owning client and server

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do I need to make two RPC calls?

astral gust Mar 19, 2019, 1:20 PM

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Hey guys, does anyone know how to get Seamless transitions working for client/server travel? We have enabled it in the game mode and added the transition map, but it isn't used, even when enabling it as a parameter in client travel.

safe marsh Mar 19, 2019, 1:21 PM

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📎 unknown.png

bitter oriole Mar 19, 2019, 1:22 PM

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@astral gust You can't connect to a new server with seamless travel.

safe marsh Mar 19, 2019, 1:22 PM

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so it seems like this works, I just had to press the button twice because the first time it printed out the server hadn't replicated the variable to the owner

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but I need two RPC calls?

astral gust Mar 19, 2019, 1:23 PM

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@bitter oriole So it's only used when using Open Level?

bitter oriole Mar 19, 2019, 1:23 PM

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It's only usable when traveling from one level to another while on the same server, or in singleplayer

astral gust Mar 19, 2019, 1:25 PM

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Alright, but is it possible to make joining a session and level appear seamless? Or is simply using client travel the best option to join an existing session?

bitter oriole Mar 19, 2019, 1:25 PM

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Client travel + loading screen

astral gust Mar 19, 2019, 1:26 PM

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Alright that makes a bit more sense for us then. Thanks a lot again!

tardy cosmos Mar 19, 2019, 1:27 PM

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the flow that I am using is:

Hosting a with open with listen
Once the client is in the same lobby, travel seamless to another map

#

my level is still empty , so that is why I expect not see any loading screen there (even if I have setup a treveling map)

bitter oriole Mar 19, 2019, 1:28 PM

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That only works if everyone joins at once though

astral gust Mar 19, 2019, 1:28 PM

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Exactly

#

It's probably the best one for lobby based match making, but for drop-in/drop-out we will have to use a loading screen widget I guess.

tardy cosmos Mar 19, 2019, 1:29 PM

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seamless only is useful to travel together right?

astral gust Mar 19, 2019, 1:31 PM

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Yeah, but it's also nice to have some sort of transition between the main menu and the server level

thin stratus Mar 19, 2019, 1:31 PM

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Well, either you move together to the next map or you join/disconnect

#

The later two are HardTravels anyway

astral gust Mar 19, 2019, 1:31 PM

#

God has spoken

thin stratus Mar 19, 2019, 1:32 PM

#

For the HardTravels (and SeamlessTravels) you can use a simple Loading Screen

#

The only annoying thing about that is that it has Slate as entry barrier afaik

#

The code is so easy you can literally copy paste it

#

But you can't use Widgets for that

#

At least not animated?

#

@chrome bay Might know more

astral gust Mar 19, 2019, 1:32 PM

#

alright

thin stratus Mar 19, 2019, 1:32 PM

#

If you check the google for Wiki + Loading Screen + Ue4 or so

#

You'll find his post

astral gust Mar 19, 2019, 1:33 PM

#

Thanks!

chrome bay Mar 19, 2019, 1:33 PM

#

^ what he said

tardy cosmos Mar 19, 2019, 1:34 PM

#

using bp, I was thinking that you can use the traveling map to add some widget with an icon there?

#

so once the seamless travel triggers, loads the transition map ( where I can enable a widget) and then, once the level is fully loaded, I can hide the widget and start the game?

astral gust Mar 19, 2019, 1:34 PM

#

Here it is https://forums.unrealengine.com/community/community-content-tools-and-tutorials/67244-seamless-proper-loading-screens-play-movies-audio-animated-widgets?95494-Seamless-Proper-Loading-Screens!-Play-Movies-Audio-amp-Animated-Widgets!=

Unreal Engine Forums

This is the place to show, share, and link to your stuff!

thin stratus Mar 19, 2019, 1:38 PM

#

@tardy cosmos Technically, yes. I don't know how Widgets behave in a Seamless Travel, neither did I ever utilize the transition level

graceful cave Mar 19, 2019, 1:40 PM

#

@safe marsh you dont need two RPCs in that situation because its most likely a client already pressing the key

#

client does not need to call an RPC on itself

#

it just calls a function

#

unless its the listen server host, then you would need to call an rpc to the owning client

#

its not printing the variable value on the client the first time you press it because replication isnt instant

#

id recommend testing everything with the NetPktLag=X command because lag will always exist in a real packaged game with real players

#

50 is a reasonable amount but setting it to 300 or so is good for testing

#

if something works at 300 ping, it will work great at 50

fleet raven Mar 19, 2019, 1:44 PM

#

worth noting that setting that to 300 will not replicate a real 300ms ping

#

instead, it will delay outgoing packets from that side by 300ms

#

so it's more realistic to set it to 150 on both sides

tardy cosmos Mar 19, 2019, 1:46 PM

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@thin stratus at least this is what I am expecting and I saw in a tutorial, but I didnt try yet. Since my map is empyt, I guess that I am not seeing the traveling map because the loading time is fast enough

thin stratus Mar 19, 2019, 1:46 PM

#

Yeah could totally be

ivory portal Mar 19, 2019, 2:18 PM

#

I am currently using gamelift to host my dedicated servers, it is working but I am wondering. In my logs I still see the No game present to join for session (GameSession). Anyone know how to fix this?

#

or what it even really means? Because players can see eachother

rain coral Mar 19, 2019, 3:26 PM

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The server replicates a variable to the client, from the server's BeginPlay, before the client has even run begin play on their own actor. Thus they are unequipped to deal with the replicated variable. So I have to run a BeginPlayStuff() on the client before BeginPlay has actually run. How do I avoid weird stuff like this?

meager spade Mar 19, 2019, 3:28 PM

#

why does the server replicate it from its begin play?

#

the GameMode runs server only

#

and has HandlePlayerStarted or something

#

which is for the purpose of setting stuff on that player when its spawned in

rain coral Mar 19, 2019, 3:30 PM

#

Hm I'll check that out, thanks!
So far I've just spawned the player's items from the server, in the item manager class, and tried to replicate it to the client version.

meager spade Mar 19, 2019, 4:37 PM

#

when the player connects

#

you should then spawn the items

#

for that player

#

not before they connect

rain coral Mar 19, 2019, 4:47 PM

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Yeah it doesn't happen before they connect.

Player connects, receives a pawn, possesses it
Server version of the spawned pawn runs Begin Play
Spawns items during Begin Play on the server version
Replicates the item reference from server to client of the spawned pawn
Replicated value arrives on client before the client version has run BeginPlay. Then it crashes because it needs references to things that aren't set up. Then I have to make up for that by making weird compromises to the execution order.

e.g:

📎 unknown.png

slender yarrow Mar 19, 2019, 4:53 PM

#

not sure if im over thinking this: I have bools i want to set after the user has pressed shift to sprint. Should these be "set on the server" as im always hearing? If so, am i doing it properly in this picture? I tried every configuration of setting them after the replicated event and the characters wont sprint properly. But layed out the way it is now, the sprinting works perfectly. Basically: does this picture looks right for a sprinting event with bool states that need to be set?

📎 1.jpg

meager spade Mar 19, 2019, 5:01 PM

#

@slender yarrow i didnt look at your spaghetti, but when my character wants to sprint, i set a bool WantsToSprint, this then handles sprinting (in complex cases like disabling sprint when backpeddling, disable sprint whilst aiming etc), once they can sprint, i set sprint locally and then get the server to set the sprint so it can handle animations, etc whatever it needs for sprinting

#

http://interkaos.com/grabs/2019-03-19_17-02-25.mp4

▶ Play video

#

this is all with the sprint key held down

hot ridge Mar 19, 2019, 5:10 PM

#

I am having a weird problem that I lose my input ability when doing server travel... My server and client show up possessing the correct pawns, but then I can't do any input (using VR controllers, buttons wont work)

#

I am enabling input from gamemode, but no luck...

slender yarrow Mar 19, 2019, 5:11 PM

#

@meager spade appreciate the reply. Im still lost but Ill just have to go back to the drawing board

meager spade Mar 19, 2019, 5:13 PM

#

yeah

#

best is to set a bool, and i check in tick if the player is holding sprint and they are allowed to sprint

#

cause otherwise player would be annoyed if they were holding sprint, jumped and sprint stopped working when they landed

slender yarrow Mar 19, 2019, 5:15 PM

#

makes sense

#

thanks

shut gyro Mar 19, 2019, 5:39 PM

#

How would I disable the replication graph in other maps besides the main ones? For instance, it is active in my lobby, but I don't want it to be active there, only in the main game map

twilit swift Mar 19, 2019, 5:40 PM

#

Hey guys, I'm having a hell of a time debugging an issue in the replay system. Can anyone tell me how PlayReplay spawns in actors for a replay? I can't seem to find the actual place in the code where the actors spawn in /initialize/beginplay, etc...

weary mortar Mar 19, 2019, 6:57 PM

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@winged badger @weary mortar how many times do you call PlayMontage when client side?<--- I'm writting logs when I trigger the event in code, and after the play animation montage in BP....and it appears only one call

cedar finch Mar 19, 2019, 7:46 PM

#

@thin stratus Thank you so much for your explanation on my control rotation spectating problem. I didn't know that they only existed on client and server. Once you told me that I was able to fix it. It's working perfect now. Thanks again. Your the best! 😃

hushed warren Mar 19, 2019, 8:06 PM

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@shut gyro you can use this code to create a ReplicationDriver / ReplicationGraph per map / gamemode

UReplicationDriver::CreateReplicationDriverDelegate().BindLambda([](UNetDriver* ForNetDriver, const FURL& URL, UWorld* World) -> UReplicationDriver*
{
    return NewObject<UMyReplicationDriverClass>(GetTransientPackage());
});

thin stratus Mar 19, 2019, 8:13 PM

#

LogNetHoverMovement: *** CLIENT BEFORE MOVE - Timestamp: 146.624985 | Location: X=501.173 Y=-1059.453 Z=1469.956 | Accel: X=0.000 Y=0.000 Z=0.000 | Vel: X=374.782 Y=163.678 Z=0.212 | AngVel: X=0.000 Y=0.000 Z=0.000
LogNetHoverMovement: *** SERVER BEFORE MOVE - Timestamp 146.624985 | Location: X=500.862 Y=-1059.787 Z=1470.116 | Accel: X=0.000 Y=0.000 Z=0.000 | Vel: X=374.810 Y=163.663 Z=0.212 | AngVel: X=0.000 Y=0.000 Z=0.000

#

Given I don't have any Packet Loss or so enabled and only perform linear 2D movement, no jumping, no gravity, no driving into things.

#

Is that a normal error in location and Velocity?

#

(Random Timestamp)

#

Because technically I would expect these to be closer

fleet raven Mar 19, 2019, 8:17 PM

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that seems to be just below the error threshold for an adjustment, which is sqrt(3) units

thin stratus Mar 19, 2019, 8:21 PM

#

Correct

#

Just wondering if it should be closer

#

Or if I could assume this is an acceptable result

#

Trying to get my Hover Movement Replication async sh't fixed by starting at 0

#

No Gravity, no Hovering, no Collisions with Walls, Floor, Ceiling or other Actors, no Packet Loss etc., no Rotation

#

I guess having 0.3 difference is "okay" :/

#

Wait a second

#

If I send the InputAcceleration to the Server NetQuantized10

#

Then I need to also use a rounded version for the client, right?

#

Otherwise they use a different input acceleration which will def result in a wrong velocity

fleet raven Mar 19, 2019, 8:32 PM

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it's not going to be deterministic anyway

#

like how the character movement does variable tick rate on the client and then combined ticks on the server

cedar finch Mar 19, 2019, 8:43 PM

#

How could I tweak this so it replicates my camera location as well? Right now I'm replicating the Swing arm rotation but can't get the camera location to look right: https://i.gyazo.com/12bed6b39d142e057c542c89c81c4ac5.png https://i.gyazo.com/6e26fb17d29f7ed2eb4be02d02d96237.gif

chrome bay Mar 19, 2019, 9:51 PM

#

@thin stratus Yeah you should round the input, definitely helps alleviate some error

#

Substepping is also important for the server since if combines many delta's into one move (assuming you're following CMC's example)

#

It's pretty damn close to deterministic then

#

Also using the timestamp reset system that CMC does helps there too

thin stratus Mar 19, 2019, 10:11 PM

#

I am sticking pretty close to the CMC

#

Minus that base and nav stuff

chrome bay Mar 19, 2019, 10:12 PM

#

Also I discovered fairly recently that using a PrimitiveComponents COM for any movement calculations creates insane amounts of jitter for some reason I never bothered to work out.. ended up using a socket location instead.

#

Yeah similar to what I did. I've since moved to physics because I like to make life hard for myself when it comes to shapes etc...

thin stratus Mar 19, 2019, 10:13 PM

#

Yeah not gonna do that haha

chrome bay Mar 19, 2019, 10:13 PM

#

Honestly do not blame you 😄

thin stratus Mar 19, 2019, 10:13 PM

#

We have the offline movement already done

#

Just need to get it replicated

chrome bay Mar 19, 2019, 10:14 PM

#

I guess hoverloop ships nicely fit inside simple collision shapes etc..

#

and don't have articulated parts and the like

#

FML

thin stratus Mar 19, 2019, 10:21 PM

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Yeah well they are just round

#

They can basically be a sphere or a box

thin stratus Mar 19, 2019, 10:59 PM

#

@chrome bay Given I fix the rounding (not sure if it's actually broken or printing before rounding), these numbers, in editor, should then not desync in the given test environment of no collision, gravity, hover or angular force?

#

Cause i want to have a working base before adding more stuff to it - _-

#

Despite some really small rounding errors if even

covert ember Mar 20, 2019, 3:37 AM

#

I have a question, my respawn BP does not work correctly on the server, but on Clients, it works perfectly fine. The bug is, when the server kills a client, the screen freezes for the server, I am assuming it has something to do with the player controller, but I have been trying to fix this for 2 days now, and its starting to be a big problem. I have created other respawn BP in the past, which all work with no issues, but for some reason I cannot get this to work.

pallid mesa Mar 20, 2019, 6:48 AM

#

Is there an easier way to test late joiners on a Multiplayer based project? I tried making net cull super super little and the results aren't the same. I need to open a dc session, join with one player, do something and then join with the other to see if the "late joiners" logic worked, and it's hella slow... Any advice?

#

Also, side note, I understand Networking. I'm just testing some onrep logic I'm refactoring

real yacht Mar 20, 2019, 9:41 AM

#

when i increase movement speed in movement component in third person character, net is clamping speed, trying to correct speed and movement is not smooth

#

is there something in component that i need to change so i can achieve smooth movement

thin stratus Mar 20, 2019, 10:50 AM

#

You have to change the MovementSpeed (if runtime) on everyone via a RepNotify variable

#

MaxWalkSpeed is not replicated

#

Right so I double checked my network code and I was printing too early on the Server. The Acceleration is the same on Server and Client.
They both round the vector to 1 decimal place and then make sure to clamp it again ( in case it got rounded upwards).

Timestamp: 13.633297 | Location: X=-5457.979 Y=-740.279 Z=200.000 | Accel: X=0.000 Y=-2500.000 Z=0.000 | Vel: X=-433.512 Y=-421.695 Z=0.000
ClientTimeStamp 13.633297 | Location: X=-5458.041 Y=-740.285 Z=200.000 | Accel: X=0.000 Y=-2500.000 Z=0.000 | Vel: X=-433.542 Y=-421.706 Z=0.000

#

Now there is still a verrrrry small difference in Location and Velocity

#

And I have 0 idea if that is normal and expected in this test environment (PIE, no Packet lag stuff, no collision, no gravity or hover acceleration, no angular acceleration)

#

I guess even with the same start location and the same acceleration, the math code yield some small rounding differences for client and server?
Even though I would assume a number to be rounded the same way in every attempt on the same PC

meager spade Mar 20, 2019, 10:59 AM

#

thats just float inprecision

#

im pretty sure its not guaranteed to be the same everytime even if the same values are fed in

chrome bay Mar 20, 2019, 11:00 AM

#

@thin stratus have you checked the simulation delta times as well to make sure they are identical?

thin stratus Mar 20, 2019, 11:01 AM

#

No I haven't.

#

Let me print that too

real yacht Mar 20, 2019, 11:01 AM

#

i think that repNotify will solve problem

#

i will try

chrome bay Mar 20, 2019, 11:02 AM

#

It'll be a bit of a trickier test since I guess your combining moves etc together as well?

thin stratus Mar 20, 2019, 11:02 AM

#

Yeah, but I don't see this happening too often in this test case

chrome bay Mar 20, 2019, 11:02 AM

#

You may know already but when CMC does the move the client doesn't necessarily use the frame delta time, it tries to work out what delta the server would simulate with

thin stratus Mar 20, 2019, 11:03 AM

#

CLIENT BEFORE MOVE - Timestamp: 6.150025 | DeltaTime: 0.016667 | Location: X=3142.898 Y=-1569.923 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-980.509 Y=1282.527 Z=0.000
CLIENT POST MOVE -   TimeStamp 6.150025 | DeltaTime: 0.016667 | Location: X=3125.685 Y=-1548.904 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-1032.745 Y=1261.148 Z=0.000
SERVER BEFORE MOVE - ClientTimeStamp 6.150025 | DeltaTime: 0.016667  | Location: X=3142.917  Y=-1569.915 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-980.509 Y=1282.542 Z=0.000
SERVER POST MOVE -   ClientTimeStamp 6.150025 | DeltaTime: 0.016667 | Location: X=3125.704 Y=-1548.896 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-1032.745 Y=1261.162 Z=0.000

#

Seems to be the same deltaTime

chrome bay Mar 20, 2019, 11:04 AM

#

yeah that doesn't look too bad then

thin stratus Mar 20, 2019, 11:04 AM

#

I can live with the numbers being slightly different, but only if no one tells me that this shouldn't happen "already"

chrome bay Mar 20, 2019, 11:04 AM

#

I'm not sure how close mine were to each other tbh.. I was doing some pretty heavy throttling and wasn't seeing many if any corrections

#

Yeah

thin stratus Mar 20, 2019, 11:05 AM

#

It's not that big of a diff

#

Always around 0.0XY

#

But I would still assume that it shouldn't really happen

chrome bay Mar 20, 2019, 11:06 AM

#

Is that on different machines btw or on same machine?

thin stratus Mar 20, 2019, 11:06 AM

#

Same

#

Just PIE

#

CLIENT BEFORE MOVE - Timestamp: 0.033333 | DeltaTime: 0.016667 | Location: X=4999.306 Y=-4250.000 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-41.660 Y=0.000 Z=0.000
CLIENT POST MOVE - TimeStamp 0.033333 | DeltaTime: 0.016667 | Location: X=4997.917 Y=-4250.000 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-83.320 Y=0.000 Z=0.000
SERVER BEFORE MOVE - ClientTimeStamp 0.033333 | DeltaTime: 0.016667 | Location: X=4999.305 Y=-4250.000 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-41.660 Y=0.000 Z=0.000
SERVER POST MOVE - ClientTimeStamp 0.033333 | DeltaTime: 0.016667 | Location: X=4997.917 Y=-4250.000 Z=200.000 | Accel: X=-2500.000 Y=0.000 Z=0.000 | Vel: X=-83.320 Y=0.000 Z=0.000

chrome bay Mar 20, 2019, 11:07 AM

#

yeah. you would think they would be pretty much indistinguishable.. but I can't remember if mine were now...

thin stratus Mar 20, 2019, 11:07 AM

#

There is already small differences on the second tick

#

e.g. Location X is different on the third decimal place

#

And as we all know, rounding or precision errors pile up pretty fast I guess

chrome bay Mar 20, 2019, 11:07 AM

#

yeah for sure

#

My only other suggestion would be add 'copious logging' to the movement calculation itself to see where precision is lost maybe?

thin stratus Mar 20, 2019, 11:10 AM

#

Yeah I'm currently trying to see where the error got bigger

#

It looks like the error just got bigger over time

#

0.001 went to 0.002 and 0.003 and then it got exponentially bigger

#

CLIENT BEFORE MOVE - Timestamp: 0.016667 | DeltaTime: 0.016667 | Location: X=5000.000 Y=-4250.000 Z=200.000
CLIENT POST MOVE - TimeStamp 0.016667 | DeltaTime: 0.016667 | Location: X=4999.306 Y=-4250.000 Z=200.000
SERVER BEFORE MOVE - ClientTimeStamp 0.016667 | DeltaTime: 0.016667 | Location: X=5000.000 Y=-4250.000 Z=200.000 
SERVER POST MOVE - ClientTimeStamp 0.016667 | DeltaTime: 0.016667 | Location: X=4999.305 Y=-4250.000 Z=200.000

#

You might be right though

#

The error basically comes up after the first tick

#

Even if just small

#

I could try to print the location with more decimal places to see if the first ever location of 5000.000 doesn't already have an diff on client and server

ivory portal Mar 20, 2019, 11:15 AM

#

When a player does ALT+F4 the OnLogout does not get triggered

#

how can I catch this?

thin stratus Mar 20, 2019, 11:16 AM

#

Hm, it should after some time

#

ALT+F4 is basically a timeout

ivory portal Mar 20, 2019, 11:16 AM

#

mmm ok, Ill watch my server logs a bit longer

thin stratus Mar 20, 2019, 11:20 AM

#

CLIENT BEFORE MOVE - Timestamp: 0.016667 | DeltaTime: 0.016667 | Location.X: 5000.0000000000 | Location: X=5000.000 Y=-4250.000 Z=200.000 
LCLIENT POST MOVE - TimeStamp: 0.016667 | DeltaTime: 0.016667 | Location.X: 5000.0000000000 | Location: X=5000.000 Y=-4250.000 Z=200.000
SERVER BEFORE MOVE - ClientTimeStamp: 0.016667 | DeltaTime: 0.016667 | Location.X: 4999.9995117188 | Location: X=5000.000 Y=-4250.000 Z=200.000
SERVER POST MOVE - ClientTimeStamp: 0.016667 | DeltaTime: 0.016667 | Location.X: 4999.9995117188 | Location: X=5000.000 Y=-4250.000 Z=200.000

#

@chrome bay Well that explains a bit more

#

Why spawn a pawn on the same X location if you can fuck it up

#

Given that, the Server already right at the start has a different location than the client

#

No wonder this goes async over time

#

Now is that something I can fix? Idk. This is literally the respawn system of UE4 (RestartPlayer), which gets a SpawnPoint and then Replicates the Pawn Spawning

chrome bay Mar 20, 2019, 11:30 AM

#

Ooft yeah that's tricky.. I guess you just have to live with that haha

#

I figure RepMovement rounds transforms right? That might be it

#

Mind you if that's the case, I would live with it

thin stratus Mar 20, 2019, 11:31 AM

#

It will cause one correction at some point

#

I can live with that

#

Just annoys me that this is the reason cause ToString seems to round too

chrome bay Mar 20, 2019, 11:32 AM

#

one day everything will be fixed point maybe 😄

thin stratus Mar 20, 2019, 11:32 AM

#

I would have thought ToString would print 4999.999

solar stirrup Mar 20, 2019, 12:03 PM

#

Does calling Destroy() on an actor destroy it on every client and the server?

chrome bay Mar 20, 2019, 12:08 PM

#

If it's a replicated actor and you call it server-side then yes

#

The actor channel will be closed and destroy it

rain coral Mar 20, 2019, 12:39 PM

#

Got a pickle - let's say I have a replicated item variable. When the listen server throws/drops the item, it gets nulled on server and then on client. However, in order for the client to run the item-dropping code, the item cannot be null until it has been dropped. So the replicated value reaches the client before the command to drop the item does, I suppose. Then the client never understands which item to drop.

thin stratus Mar 20, 2019, 1:08 PM

#

So you are calling Destroy as well as an RPC

#

And the Destroy happens before the RPC?

#

At least on Client Side?

ivory portal Mar 20, 2019, 1:21 PM

#

Someone knows with Gamelift, do you need to call the init sdk every gamemode or?

thin stratus Mar 20, 2019, 1:33 PM

#

Probably

#

@chrome bay https://i.imgur.com/WYQXPZe.png
Turned on GravityAcceleration and HoverAcceleration. Small bumpers on the floor don't cause any correction, but stuff like this does.
Now that's not really the stuff that a player will hover over, but I wonder if that's expected or shouldn't happen :x

Imgur

#

Server View, but Client Drone (spectating)

chrome bay Mar 20, 2019, 1:41 PM

#

Hmm. What about smooth-ish bumpy terrain?

thin stratus Mar 20, 2019, 1:45 PM

#

📎 unknown.png

#

I seem to have barely any corrections on the top thing

#

The one below that, with the little ramp on the right end is also fine

#

The spheres give corrections just by trying to balance on them

#

@chrome bay

#

And the rotated spikes at the bottom also cause them but mostly due to missing hover accleration (not enough "floor") and colliding with them the whole time

#

But I can for example drive over the ramp at the top right multiple times, glide through the air, drive over the bumpy road at the top and it's all fine

chrome bay Mar 20, 2019, 1:57 PM

#

Yeah I guess the ramps would be less susceptible to the normal changing as the location is modified slightly

thin stratus Mar 20, 2019, 1:59 PM

#

Yeah so this can only be tested with both gravity and hover acceleration being active.
So I could blame both if it's really a coding issue.

#

Now Gravity is fairly simple and static so I would say if there really is a problem, aside from just the Server and Client not being able to stay synced in that scenario, then it's the way hovering works

#

I'll reformat my prints and import all that data so I can easier sort it

twin juniper Mar 20, 2019, 2:19 PM

#

is there any tutorial on how to make multiple lobbys with player created waiting rooms where the host (the player created it) changes the level, max players, rules and can kick certain players.
i cant find any

twin juniper Mar 20, 2019, 3:01 PM

#

1>------ Skipped Build: Project: ShaderCompileWorker, Configuration: Invalid x64 ------
1>Project not selected to build for this solution configuration
2>------ Build started: Project: UnrealSandbox, Configuration: Invalid Win32 ------
2>The selected platform/configuration is not valid for this target.
========== Build: 1 succeeded, 0 failed, 2 up-to-date, 1 skipped ==========

#

this is appear in 4.21.2
worked fine in 4.21.0

#

dedicated server

rain coral Mar 20, 2019, 3:11 PM

#

Is there a way in an OnRep_Function to simply not accept the new value?

#

Other than making a second variable as a backup that is not replicated..?

#

I'm aware you can send the previous value through the OnRep function with a parameter, but worried about sending too much info over the net (actor ref)

thin stratus Mar 20, 2019, 3:39 PM

#

Well if you set it to a different value it will try to replicate next time the actor replicates

#

If you don't need that to happen that often, don't set it that often

#

A second variable is totally valid

rain coral Mar 20, 2019, 3:52 PM

#

Guess I'll go with a locally stored Prev_Variable. It's an edge case thing where the server replicates a nulled variable when the client is supposed to null it themselves after doing an action. It just replicates too soon

unique thunder Mar 20, 2019, 3:53 PM

#

Can anyone shed light on the timing of major class initialization on a dedicated server?
For some reason, this fails:

Game Instance server travels to new map
Game State casts to Game Instance and retrieves variable
Player joins server, creates widget. That widget casts to Game State and pulls the variable

What I end up with is the default variable set in the Game State, not the one it pulled from the Game Instance. Maybe I'm not running an event with a specific RPC or something to hold the variable in the right place

#

The first two occur before a player even joins, so it's the server handling those on its own.

chrome bay Mar 20, 2019, 3:57 PM

#

While I remember, because someone twigged me about it yesterday. Replicating a class/tsubclass only uses a string/path the first time

#

After that, a NetworkGUID is created and they are replicated by number.

chrome bay Mar 20, 2019, 4:40 PM

#

https://dev.epicgames.com/en-US/services

#

OMG OMG OMG OMG OMG

twin juniper Mar 20, 2019, 4:42 PM

#

Holy Crap!

meager spade Mar 20, 2019, 5:23 PM

#

:/

slender yarrow Mar 20, 2019, 5:28 PM

#

for an FPS: should something like gun construction (setting gun mesh, sights, tac grip, silencer, etc.) be replicated on server? I dont see how the user on the client could hack that. Maybe change all the meshes but that doesnt really effect other players or the game. Whats the normal practice for this?

reef tinsel Mar 20, 2019, 5:32 PM

#

@slender yarrow generally, you'd want to replicate anything that could affect any other players. In your case, a silencer, for example, may have an effect on the minimap of other players (hiding them). Consider this when replicating equipment specially.

#

I have a session question:
Whenever a player controller joins a session, and therefore joins a match, do all widgets get destroyed? I'm trying to make a very simple loading screen. The problem is, once the player joins, the widget gets destroyed.
Is there a way to make it persistent? We're already creating and adding it to player screen in the Game Instance

pallid mesa Mar 20, 2019, 7:59 PM

#

if you really want something more persistent than the GI and not reliable on the pc, use GameViewportClient

#

however as your words say... You want to make it simple

#

you could snap this widget to be active on the hud

#

as soon your controller gets initialized you can change the alpha of the widget to make it disappear

#

it's a normal technique to fake world loading

#

and very simple tho.

meager spade Mar 20, 2019, 8:56 PM

#

loading screens are normally handled in slate, as per the loading screen example

pallid mesa Mar 20, 2019, 10:02 PM

#

yes they are hehe, but if you don't want to touch C++

#

that's the alternative

meager spade Mar 20, 2019, 10:05 PM

#

i am confused right now

#

LogTemp: Warning: Host? 0, CurrentWeapon: BP_Weapon_AR4_C_0, Pawn: BP_PlayerPawn_C_0
LogTemp: Warning: Host? 0, CurrentWeapon: BP_Weapon_AR4_C_1, Pawn: BP_PlayerPawn_C_1
LogTemp: Warning: Host? 0, CurrentWeapon: BP_Weapon_AR4_C_0, Pawn: BP_PlayerPawn_C_0
LogTemp: Warning: Host? 0, CurrentWeapon: BP_Weapon_AR4_C_0, Pawn: BP_PlayerPawn_C_0
LogTemp: Warning: Host? 1, CurrentWeapon: BP_Weapon_AR4_C_0, Pawn: BP_PlayerPawn_C_0
LogTemp: Warning: Host? 0, CurrentWeapon: BP_Weapon_AR4_C_0, Pawn: BP_PlayerPawn_C_0
LogTemp: Warning: Host? 0, CurrentWeapon: BP_Weapon_AR4_C_0, Pawn: BP_PlayerPawn_C_0```

#

clearly the weapon is being replicated

#

oh that is odd

rocky badger Mar 20, 2019, 11:46 PM

#

is there a good way of getting the player controller from a character?
I'm trying to just use 'GetController()' with a cast to my custom controller but its giving me errors

solar stirrup Mar 21, 2019, 12:01 AM

#

what errors

rocky badger Mar 21, 2019, 12:31 AM

#

@solar stirrup I'm getting null pointer errors; i cant log it either since it's saying it doesnt exist unless theres a work around i dont know of

tropic snow Mar 21, 2019, 1:30 AM

#

best way to emit gun particle so that tps matches fps?

#

model

plush lagoon Mar 21, 2019, 2:09 AM

#

Where would i store a Variable, too have it passed too the Server once the client has finished connecting too the Server?

#

Since Gamemod eis only on the Server, I assume once you join your GameState is also overwritten correct?

#

From the one from the server?

worthy perch Mar 21, 2019, 2:27 AM

#

GameInstance, or your could pass the value to the GameServer when you start travel to it.

tropic snow Mar 21, 2019, 2:33 AM

#

How do I make it so this won't output an error

📎 unknown.png

mild forge Mar 21, 2019, 3:06 AM

#

Is it common to call player controller's method from player character or in reverse direction?

plush lagoon Mar 21, 2019, 3:08 AM

#

thank you @worthy perch 😉 doing just that, but i'm parsing it in the InitNewPlayer function in the Game Mode, then on player controller creation, assigning the data which is then replicated/sent too the client.

#

From there the client waits for the onPostLogin, and then checks the data against the server for a validated login.

#

nods

slender yarrow Mar 21, 2019, 4:59 AM

#

@tropic snow possibly do a switch has authority check before you call TPS muzzle flash (server)

tropic snow Mar 21, 2019, 5:02 AM

#

but then it will only work for server only?

#

oh wait I'll just do the opposite then.

real yacht Mar 21, 2019, 10:13 AM

#

i have recorded my test.nprof file to see some network statis in NetworkProfiler

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is there any document, how to interpret stats

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what are the bad stats, what are the good one...etc

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are stats here good or bad? two players on dedicated server with bullets and powerups

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thin stratus Mar 21, 2019, 10:36 AM

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Check the Actors and RPC tabs

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And Properties

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Check how often they call

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How much data per second they take up on your bandwidth

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Look up how much bandwidth is generally expected for games

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And chekc if the call counts on some of your rpcs isn't too high for what they are supposed to do

real yacht Mar 21, 2019, 10:37 AM

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what are upper limits bandwidth, call counts, etc..

thin stratus Mar 21, 2019, 10:38 AM

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Idk upper bandwidth limits out of my head. Would need to google that too.
Call counts depend on your game.

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Or rather on the function in question

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It's not so much a thing that can just be compared to a list of "Max calls"

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It's case to case

real yacht Mar 21, 2019, 10:39 AM

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yes i know but there must be some best practices, or something like that

thin stratus Mar 21, 2019, 10:39 AM

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If you call UpdateHealth RPC every frame, then that's maybe bad

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Cause health doesn'T always change

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And maybe you are constantly replicating a float or integer variable

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Which could easily be simulated

real yacht Mar 21, 2019, 10:39 AM

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yes, that okay

thin stratus Mar 21, 2019, 10:39 AM

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And just kept in sync every 10 seconds

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Best practices are to keep replication count as low as you can

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And bandwidth usage too

real yacht Mar 21, 2019, 10:47 AM

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hmm

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i will do some research

inland pond Mar 21, 2019, 11:04 AM

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What can I do when classes which get replicated depend on each other on the client? For instance I call inside the PlayerState OnRep a function which will use the GameState. So then I would first need to get if the GameState is ready. What can I do about it? I had though about a timer which will check the state of GameState's instance every n second to register an event and stops when it was ready.

real yacht Mar 21, 2019, 11:28 AM

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do you think this is correct way for turret rotation (this is happening in tick, when mouse moves)

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@thin stratus

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and i have

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📎 unknown.png

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maybe too much rpc calls, so i want to decrease that

thin stratus Mar 21, 2019, 12:07 PM

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Yeah that's something where you can think about it being calculated on the client too

graceful cave Mar 21, 2019, 12:12 PM

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@inland pond you can make two bool variables somewhere that are set when each on rep function runs

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and when they do run, check to see if the variable for the other function has been set

real yacht Mar 21, 2019, 12:15 PM

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i have tried with repNotify but i didn't get it work with rotation :/

inland pond Mar 21, 2019, 12:17 PM

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that sound great, thanks for your response!

rain coral Mar 21, 2019, 2:02 PM

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I have a case where some actors that are marked for replication are spawned in BeginPlay and don't get replicated to clients, ever. Under very specific circumstances, it's weird. If I spawn the actors after a small delay, everything is fine.
I feel like there's many situations where it gets overwhelmed and stuff collapses, never recovering. Is this a common thing?

winged badger Mar 21, 2019, 2:53 PM

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are they actually spawned on server?

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do you have a monster construction script in the actors doing the spawning?

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any LogSpawn messages in OutputLog?

rain coral Mar 21, 2019, 2:57 PM

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@winged badger Yeah, the server spawns them (they appear on clients), but the variables holding references to the active items (which are Replicated) don't always get through to the client, unless I wait something like 1.5 seconds after the game has started. Entry point is BeginPlay.

I'll check the OutputLog!

winged badger Mar 21, 2019, 2:58 PM

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active items are what in this context?

rain coral Mar 21, 2019, 3:00 PM

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It's one item reference for each hand. Items can be thrown (at which point they are nulled) and picked up (at which point they're set to the picked up item).

winged badger Mar 21, 2019, 3:00 PM

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but item is a dynamically spawned actor?

rain coral Mar 21, 2019, 3:00 PM

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Yeah they're spawned dynamically

winged badger Mar 21, 2019, 3:01 PM

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and they also show on clients?

rain coral Mar 21, 2019, 3:01 PM

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Yeah

winged badger Mar 21, 2019, 3:01 PM

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whats the NetPriority Like items/Pawn?

rain coral Mar 21, 2019, 3:02 PM

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I haven't changed any NetPriority (or similar) settings from default

winged badger Mar 21, 2019, 3:02 PM

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how many items are we talking about? do they have lot of custom network code in them?

rain coral Mar 21, 2019, 3:04 PM

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Two items per player that is spawned. They shouldn't have anything going on on initialization that affects the network, but an example is a gun that can send a shoot command to the server

winged badger Mar 21, 2019, 3:10 PM

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increase their network priority to above that of PlayerPawns

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they are spawned server side in same frame as players?

rain coral Mar 21, 2019, 3:14 PM

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Changing the priority didn't change anything. The item actors themselves replicate anyway, but the variables referencing the 'current item' in each hand isn't.

I suppose it's the same frame yeah. The server spawns the pawns, the server-side pawns spawn their own loadouts. I've tried waiting 0.5 seconds with the same problems, but something like 1.5 seconds was fine

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Even if the priority would be low, it should replicate eventually, right? Even if it takes time

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Keep in mind I'm testing this in-editor, so it might not represent reality completely

winged badger Mar 21, 2019, 3:58 PM

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with higher priority it should replicate before the PlayerPawns do

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and references should be valid before BeginPlay on clients Pawns

chrome bay Mar 21, 2019, 4:28 PM

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I'd be cautious about assuming that's guaranteed to happen

winged badger Mar 21, 2019, 4:39 PM

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but as long as the references are set server-side

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the NetGUID should be valid before they replicate

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(server-side after they are spawned, that is)

thin stratus Mar 21, 2019, 4:48 PM

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If I ever figure out this damned hover movement replication I will never touch that stuff again

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Simplified the hover acceleration to just one function, no PID controller. So I'm down to just linear acceleration, constant gravity acceleration and one very simple hover acceleration function.
And I allow sqrt(400) as error -> Gets client corrections

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I don't want to know how that would look like with hte default sqrt(3)

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And also down to one single SphereTrace below the pawn

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I mean, maybe allowing 20 units of difference in location is causing more issues than solving them

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The correction with 3 units is way less visible, but obviously happens a little bit more oftne

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How often does a normal cmc character get correct?

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Is that something that happens rather often and one just doesn't notice it or is it only happening in extremer situations?

thin stratus Mar 21, 2019, 5:19 PM

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https://i.imgur.com/TlZpp4W.png

Imgur

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Let's just keep the debugs in: New Feature, once you go async, you can draw with your pawn.