#multiplayer | Unreal Source | Page 476

chrome bay Jul 12, 2019, 12:23 PM

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by index

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have a gander at the DOREPLIFETIME macro, it gets the UPROPERTY offset index or something

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tbf doing it by FName would be mental

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And all my variable names would be one-character 😄

indigo robin Jul 12, 2019, 12:25 PM

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well that doesnt matter

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as FNames are integers.

chrome bay Jul 12, 2019, 12:25 PM

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Also yes and no

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If it can be statically determined at compile time, it can use an index - but if created at runtime it can't be

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Could be wrong, but that's how I've understood it

indigo robin Jul 12, 2019, 12:27 PM

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the first time a FName is replicated it goes through as a string

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as soon as its acked by client they start using a shared integer mapping index

chrome bay Jul 12, 2019, 12:28 PM

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yeah but that's a problem - how can you know if the client has that FName in their map locally

indigo robin Jul 12, 2019, 12:28 PM

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its kept per NetConnection or something

chrome bay Jul 12, 2019, 12:28 PM

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Could be - I'm not 100% on that though

indigo robin Jul 12, 2019, 12:28 PM

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either way they are integers after initial sync

chrome bay Jul 12, 2019, 12:29 PM

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It's certainly true for uclass* at least. The first time they go through by Name, after that they have a NetGUID mapped

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Typically the docs have no docs on said subject

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Be interesting (and good) if that was the case though RE FNames

winged badger Jul 12, 2019, 12:41 PM

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can't really make a NetGUID for something that is not a pointer

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with UClass* they can be referenced by their asset path, and then they are mapped to GUID

chrome bay Jul 12, 2019, 12:42 PM

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Yeah that's what I mean, so once it's loaded it's a live UObject

winged badger Jul 12, 2019, 12:42 PM

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first time sending of the entire path is so client can map it

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it would not work for FName

chrome bay Jul 12, 2019, 12:43 PM

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Yeah, I can't see it working for FNames - unless there's a unique hash table for each connection. Can't see any evidence in source for that though

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Quizzing on UDN.. would be nice to know for certain

fleet raven Jul 12, 2019, 12:51 PM

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@indigo robin FName is replicated as string every time

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while objects have the netguid kept in the package map, no one bothered to make a net string table for fnames

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it would be quite difficult too because of the multi channels

jade gazelle Jul 12, 2019, 1:02 PM

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Are there any good documentations for implementing network smoothing for pawns? I noticed it in the PostNetReceiveLocation that the interface it uses for smoothing the location update only applies to CMC.

chrome bay Jul 12, 2019, 1:02 PM

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General approach is:

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1 - Separate visual mesh and the collision component.
2 - When receiving an update, set the collision component's location immediately.
3 - Interpolate the visual position to the collision position each tick

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That's the laymans-term approach at least

jade gazelle Jul 12, 2019, 1:04 PM

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I didn’t think about separating the collision

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That makes sense though

chrome bay Jul 12, 2019, 1:05 PM

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For CMC it does at least, as you don't want to be sending 'smoothed' positions to the server otherwise you'll be corrected constantly

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void UCharacterMovementComponent::SmoothClientPosition(float DeltaSeconds) is the place to look

jade gazelle Jul 12, 2019, 1:05 PM

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How do you address receiving another update if the current lerp hasn’t completed yet?

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Do the moves need to stack up?

chrome bay Jul 12, 2019, 1:06 PM

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CMC just accumulates the error and continues interpolating, unless the distances get too high at which point it snaps

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But usually the interpolation is uber fast

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Like, less than a few frames

jade gazelle Jul 12, 2019, 1:06 PM

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Ahhh

chrome bay Jul 12, 2019, 1:07 PM

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I believe they also have an option for running simplified movement on remote players too IIRC, which reduces the error a lot when you know input isn't changing often.

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I only remember them talking about how they disable that on mobile in fortnite, since it's costly to do so

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I do that for my physics vehicles at least, though the approach is a bit different there anyway

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Input is replicated too in my case (i use it for driving FX/audio and such anyway) - so I just have clients keep simulating with the last received input

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Falls apart when you have a lot of packet loss

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But helps assist the smoothing a bit

jade gazelle Jul 12, 2019, 1:08 PM

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Well this is just for AI, not players in my case

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So it’s always server -> client one way

chrome bay Jul 12, 2019, 1:09 PM

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Yeah just simple interpolation is probably fine in that case

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I would still snap the collision, just so you can garauntee that is always up-to-date

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If you're feeling dangerous, you can also offset the render matrix for the root component and smooth that... but that brings fresh problems with it

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Tried it but it doesn't really solve the issue for attached objects and in extreme cases you get weird bounds issues with rendering

jade gazelle Jul 12, 2019, 1:11 PM

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I am definitely more interested in just smoothing the jittery AI than implementing any complex code

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Haha

chrome bay Jul 12, 2019, 1:11 PM

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yeah

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I think interpolating the visual mesh should more than cover it for something simple

jade gazelle Jul 12, 2019, 1:12 PM

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I finally got all of the pathfinding and movement and everything all moved over and working with my custom pawn movement rather than CMC. Just need to address the interpolation now

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And I’ll be happy for a while

indigo robin Jul 12, 2019, 1:12 PM

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heh i didnt even think of that, the root component being the capsule means that any attachments that go to sockets/bones have to explicitly go to the mesh component

chrome bay Jul 12, 2019, 1:13 PM

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yeah.. I thought I was a genius when I did the render matrix smoothing for my skeletal vehicles meshes - then realised all the weapon attachments still snap anyway 🤦🏻

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Characters can get away with a lot with that nice simple capsule proxy 😦

indigo robin Jul 12, 2019, 1:14 PM

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how does that work for root motion extraction though, the root motion would be applied to the skeletal mesh which isnt the root component

chrome bay Jul 12, 2019, 1:15 PM

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to be honest I never digged into the root motion side of CMC.. the most I know about that really is it's not as cheap as the default kinematic stuff

thin stratus Jul 12, 2019, 1:20 PM

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In a Component on a Pawn: if(GetOwner()->GetNetOwner()) is working, if(GetOwner()->HasNetOwner() is not working. Both times breakpointed, both show "Owner" as NULL in my Pawn.

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(╯°□°）╯︵ ┻━┻

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How can that even happen (DebugEditor)?
How can a controlled Pawn, on the Server, no have an Owner?

chrome bay Jul 12, 2019, 1:22 PM

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colour me confused 😄

thin stratus Jul 12, 2019, 1:23 PM

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That's to make sure I only call a CLient RPC if the Component is sitting on something owned by a Client

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-_-

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Which brings me to the question, what's the preferred way of doing so if HasNetOwner fails?

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Just calling the RPC anyway? Not sure if a LevelPlaced Actor would then call the ClientRPC on the Server (which with a listenServer isn't really wanted)

plush wave Jul 12, 2019, 2:06 PM

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What exactly is the Twitch Online Subsystem used for?

timber garnet Jul 12, 2019, 3:58 PM

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Anyone know if this would work on an iOS listenserver -- meaning does GetResolvedConnectString automatically detect/find IP addresses for live sessions?

FString URL;
        IOnlineSessionPtr Sessions = OnlineSub->GetSessionInterface();
        if (Sessions.IsValid() && Sessions->GetResolvedConnectString(InSessionName, URL))

thin stratus Jul 12, 2019, 4:47 PM

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Check the OSS of iOS? :P

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It's an interface call after all

lost inlet Jul 12, 2019, 5:41 PM

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https://www.youtube.com/watch?v=CQsJBhvB5_M&feature=youtu.be

YouTube

Sha Dox

battalion1944 fixThisShit

▶ Play video

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when you forget to implement _Validate

timber garnet Jul 12, 2019, 6:33 PM

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Anyone know why running a dedicated server in the editor would not read True for NM_DedicatedServer

ie GetNetMode() == NM_DedicatedServer is false (when checked in debugger)

void AFFCGameMode::InitGame(const FString& MapName, const FString& Options, FString& ErrorMessage)
{
    Super::InitGame(MapName, Options, ErrorMessage);
    if (GetNetMode() == NM_DedicatedServer)
    {
        GameSession->RegisterServer();
    }
}

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Has two players and one dedicated server. Each one is considered "Standalone" using PIE multiplayer

fierce grove Jul 12, 2019, 6:44 PM

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Damn their is so few documentation on custom pawn movement replication in C++ 😦 !

timber garnet Jul 12, 2019, 6:46 PM

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dude there is no documentation for anything multiplayer

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the built in simple replication is like "wow, amazing' then everything else we are left on our own

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Concerning my issue above. Found the answer. If you run dedicated server and clients as "Use Single Process" they are all marked as "Standalone"

bitter oriole Jul 12, 2019, 6:57 PM

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@timber garnet PIE can't be dedicated

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Generally speaking, PIE sucks for multiplayer - no sessions, etc

timber garnet Jul 12, 2019, 6:58 PM

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So if you go to advanced settings and turn off single process, then set Multiplayer Mode to Play As Client the dedicated server works

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But do you have a good way of properly testing this?

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I'm building for iOS and testing with Unreal replication has been a nightmare

bitter oriole Jul 12, 2019, 6:58 PM

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@fierce grove Custom pawn movement basically means you have to reimplement movement networking entirely, and there's really no easy tutorial for that. There's a great one at Udemy that teaches you a custom C++ movement comp

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@timber garnet Basically you'll want to start two local Windows games and connectt each other outside editor

timber garnet Jul 12, 2019, 6:59 PM

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i see. like right clicking the icon and start game

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or do they need to be built?

bitter oriole Jul 12, 2019, 7:00 PM

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Depends what you call "built"

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The code needs to be compiled yeah

timber garnet Jul 12, 2019, 7:00 PM

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haha i mean executable

bitter oriole Jul 12, 2019, 7:00 PM

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The game doesn't need to be cooked and packaged

timber garnet Jul 12, 2019, 7:01 PM

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ive got all my replication and gameplay working great. i never would have thought that games and sessions and dedicated servers and dev ops would have been what killed me

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and since every unreal tutorial or doc involves "set two players and click play. yay, now you have multiplayer"

bitter oriole Jul 12, 2019, 7:05 PM

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Dedicated servers require a lot of work, yeah

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I'm usually around here telling people not to have them

timber garnet Jul 12, 2019, 7:07 PM

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yeah. its the only flow i can kind of understand though. i have a 1v1 or 2v2 game and I can't find information anywhere that says iOS clients can act as listen servers

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do you know?

fierce grove Jul 12, 2019, 7:11 PM

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@bitter oriole you have the link of that Udemy class 😃 !

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I was suggested to use pawn and custom movement for a multiplayer game around 3D planets 😉

bitter oriole Jul 12, 2019, 7:13 PM

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@timber garnet I'm not sure why they wouldn't be able to be listen servers, other than phone connectivity being terrible

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@fierce grove https://www.udemy.com/course/unrealmultiplayer/

Udemy

Super Simple Online Game Development: Unreal Engine and C++

Use Epic's Unreal Engine for online game development in C++. Covers LAN, VPN, Steam, and more.

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Large part of that is custom movement

fierce grove Jul 12, 2019, 7:16 PM

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oh thanks

shut gyro Jul 12, 2019, 7:50 PM

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Hey, I am trying to use NetSerialization in a custom struct I made - the FArchive that I am using to send and receive the struct data has total size -1 on both server and client. Does anyone know why this could be happening?

meager spade Jul 12, 2019, 9:13 PM

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DameMode is server only tho

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oops delayed

glad sedge Jul 13, 2019, 1:07 AM

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I should be able to see UE Log commands regardless of them coming from server vs client, right?

worthy perch Jul 13, 2019, 2:57 AM

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In PIE? Yeah.

plush wave Jul 13, 2019, 3:56 AM

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Ok so I have a parent GameMode class with a bool AllowPlayerSuicide with GameMode subclasses that have this set to true or false in their constructor. The idea is that this bool will never be changed at runtime, and needs to be in the GameMode class as that is where respawning is done.

So why should I have to duplicate this variable to the GameState for multiplayer games? I know that the game mode only exists on the server, but if the value never changes outside of the constructor of the subclass, why can't I grab this value, say from a local instance of the GameMode subclass on the client?

Duplicating this bool to GameState seem like a waste of bandwidth (yes, I know it's only a bool) and is a design that is prone to more upkeep and user error from a programmatic standpoint.

plush wave Jul 13, 2019, 4:15 AM

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I generally think of GameState as being used for replicated variables that are changed at runtime. Maybe this is incorrect thinking.

somber glade Jul 13, 2019, 4:54 AM

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So, I have a skin selector in my lobby (for testing purposes the lobby and game level are the same level, just in another room, so no level transition here). When the player has selected the skin they want, it casts to their PlayerState and sets the variable. The variable is replicated. Later on when the host starts the game, the gamemode goes to their playerstate and pulls that variable out and spawns them an avatar and applies that mesh to it. This works fine for the host. But when the gamemode goes to the playerstate for the client the variable returns blank. Do I need to run this "as server" from the widget that lets them pick an avatar? This is in blueprint

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player states are set to replicate and always relevant.

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I've printed out the functions and the widget is setting the variable on HSPlayerState1 and the gamemode is trying to get the variable from HSPlayerState1

limber mortar Jul 13, 2019, 5:33 AM

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when removing instanced static meshes there is much lag for me. It is coming from a client pawn and I want the meshes to disappear when someone comes from far away comes by later.

📎 unknown.png

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It detects and clears the grass successfully

📎 unknown.png

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I was told to try get overlapping instances and I did like this but it still made no improvement

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📎 unknown.png

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any thoughts?

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appreciated in advance

somber glade Jul 13, 2019, 5:51 AM

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So the grass is being removed, but it's laggy?

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how often are you using those traces?

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what's the frequency on them? @limber mortar

limber mortar Jul 13, 2019, 5:54 AM

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one trace every second or two

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those boulders representing the dug up ground will only place if none exist in the collision box

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and the dozer drives slow while digging

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If I put a print string after cast to instanced static mesh, and do not remove instances

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no lag

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📎 unknown.png

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I can make the bulldozer faster too no problem

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so the instance removal is the issue I assume

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i could scale the size of the grass if the instance array size is a problem

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it just looks better removing it

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think my world has 4 different grass meshes with 285k each on the map

somber glade Jul 13, 2019, 6:22 AM

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usually how many are you removing at once?

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and how are you testing this? pie only? have you packaged versions to test those?

limber mortar Jul 13, 2019, 6:40 AM

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I've tested in Pie, I have some updates I need to put on my dedicated server

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I can see how that goes if it lags

limber mortar Jul 13, 2019, 8:10 AM

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Hmm, it didn't clear on my dedicated server

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I will test more

thin stratus Jul 13, 2019, 9:16 AM

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The amount of times I forget to add a newly added replicated variable to the GetLifetime.. function is too damn high...

winged badger Jul 13, 2019, 9:17 AM

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it warns you if you add a variable in GetLifetime, but do not mark it as replicated

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other way around it just fails silently and laughs at you

thin stratus Jul 13, 2019, 9:17 AM

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Yeah it's one of these situations where you go over everything and you are like :"Do I even call the new function?!"

winged badger Jul 13, 2019, 9:19 AM

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my recent one was with replicated TScriptInterface<T>

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doesn't complain at all

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just doesn't replicate them either

somber glade Jul 13, 2019, 9:36 AM

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So.. I have a 3D lobby widget. Both the client and host can see it. There is a "hidden" timer on it for when the start button is pressed. As players join the lobby the lobby adds child widgets with the players name to it. Both the host and client can see these. When the host pushes start, the widget goes to the game mode and kicks off the logic to start the match. At this point it gets a reference to the widget, and starts the timer. Immediately after starting the timer, it goes back to the widget and runs a "Run on server/reliable" custom event that sets a replicated boolean to true (to show this countdown timer) I also tried a multicast/reliable event. The host can see this, but the client cannot.

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Here are the events on the widget. These are called from the gamemode.

📎 widgetevents.png

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here is what the function looks like called from the game mode

📎 widget2.png

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the reference to the lobby widget is correct, I've printed that out when it's set on the game mode

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Maybe I misunderstood here, but I Thought when you wanted to set a replicated variable on an actor, you run the function as the server, set it reliable and made sure the variable was replicated and it should be replicated to the actors

thin stratus Jul 13, 2019, 9:47 AM

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Widgets aren't replicated

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They can't have replicated variables or RPCs

somber glade Jul 13, 2019, 9:47 AM

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even when they're a 3D widget?

thin stratus Jul 13, 2019, 9:47 AM

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What Server and Client see are unique, non-connected, non-replicated instances

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Yeah even then

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The Actor might be, but the UUserWidget won't

somber glade Jul 13, 2019, 9:47 AM

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so..wtf are we supposed to do in VR where we have shared 3D menus?

chrome bay Jul 13, 2019, 9:48 AM

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Replicate it through some proxy object/actor

thin stratus Jul 13, 2019, 9:48 AM

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Yop, it's not shared anyway, it doesn't matter if it's an Actor it sits on or if it's created through a normal 2D process.

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The Widget is not shared, it's one instance per player

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You have to execute RPCs in Actors that can use them

somber glade Jul 13, 2019, 9:48 AM

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so..I need to set these values on the gamestate and then have the widget go get it from the game state?

chrome bay Jul 13, 2019, 9:48 AM

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Yeah

thin stratus Jul 13, 2019, 9:49 AM

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That is one option yes

somber glade Jul 13, 2019, 9:49 AM

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okay

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That's perfectly fine

thin stratus Jul 13, 2019, 9:49 AM

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UI should always only get information anyway

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The Timer itself should sit on e.g. the GameState

somber glade Jul 13, 2019, 9:49 AM

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Right..well I was just thinking about how I set a value on the playerstate by making a call to it and setting it via a run on server.

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so I thought you had to do that all the time.

chrome bay Jul 13, 2019, 9:50 AM

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Yeah you don't wanna be in a situation where widgets are in control of game flow etc.

thin stratus Jul 13, 2019, 9:50 AM

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That's also fine, as the PlayerState is owned by the client and the PlayerState is replicated

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E.g. your Widget can have a button called "SetIsReady"

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Which gets the PlayerState and tells it to set the Ready Boolean

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Which then either is already an RPC or performs an additional RPC (all located in the PS) to set the boolean

somber glade Jul 13, 2019, 9:51 AM

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So when the gamemode sets the value on the gamestate, do I need to set it there via a run on server custom event?

thin stratus Jul 13, 2019, 9:51 AM

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For player experience, always set things like this locally AND on the server

somber glade Jul 13, 2019, 9:51 AM

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and make sure it's replicated?

thin stratus Jul 13, 2019, 9:51 AM

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No, the GameMode already only exists on the Server

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RPCs are used to move from Clients to Server or back

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If you are on the Server and you call a function that is not an RPC, you'll still be on the server

somber glade Jul 13, 2019, 9:51 AM

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ah okay

thin stratus Jul 13, 2019, 9:52 AM

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You do need to make sure the variable is replicated though

somber glade Jul 13, 2019, 9:52 AM

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Yes of course

thin stratus Jul 13, 2019, 9:53 AM

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@chrome bay Quick question for you: If you have client predicted stuff like Switching a Weapon, which executes on Server and Client.
And you have an OnRep_CurrentWeapon that performs stuff that should execute on everyone, how do you handle that?
I currently have a function in CurrentWeapon that I also call in the function

somber glade Jul 13, 2019, 9:53 AM

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That explains why the players could see the server info since that was taken from game state

thin stratus Jul 13, 2019, 9:54 AM

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/// Server and Local Client
void UWeaponManager::SwitchWeapon()
{
    [...]
    SetWeapon(NewWeapon);
}
/// Server and Local Client
void UWeaponManager::SetWeapon(AWeapon* NewWeapon)
{
    // Triggers OnRep
    CurrentWeapon = NewWeapon;

    OnWeaponChanged();
}
/// Everyone but Server
void UWeaponManager::OnRep_CurrentWeapon()
{
    OnWeaponChanged();
}
/// Everyone, but maybe twice for local client?
void UWeaponManager::OnWeaponChanged()
{
    // Do stuff on everyone
}

somber glade Jul 13, 2019, 9:54 AM

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@thin stratus That did it, thanks. I didn't realize widgets won't replicate like that at all.

thin stratus Jul 13, 2019, 9:55 AM

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Any other ideas for a setup like this? Usually I mark the Variable in question as SkipOwner, but the CurrentWeapon could also be set only by the Server and then the OnRep has to call for the Local Client too

somber glade Jul 13, 2019, 9:55 AM

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I've got just about everything done and replicated for the menu, lobby, and starting the game.

thin stratus Jul 13, 2019, 9:58 AM

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Actually it might never call twice for the local client, cause if the CurrentWeapon is changed locally already and the Server change comes in, it won't fire the OnRep if it's the same value

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Maybe I'm safe :D

winged badger Jul 13, 2019, 10:08 AM

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in that case you can just send a client RPC, exi

chrome bay Jul 13, 2019, 10:10 AM

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@thin stratus I actually don't to prediction for switching the weps on my end! Too much of a pain to handle desyncs etc.

thin stratus Jul 13, 2019, 10:10 AM

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I wonder if it actually could desync

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It technically only could if the client overrides the Server, but Ping wise that should only happen other way round

chrome bay Jul 13, 2019, 10:11 AM

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I guess it's only a problem if you have situations where you in fact can't equip a weapon and server disagrees etc.

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But you could always send a one-time RPC back to say "eyy don't do this"

thin stratus Jul 13, 2019, 10:11 AM

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Basically the same way CMC works again

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Client Switches, sends Server what they ended up with

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Server switches, compares, if not the same -> correction

chrome bay Jul 13, 2019, 10:12 AM

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yeah you could do that for sure

thin stratus Jul 13, 2019, 10:12 AM

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I'll keep it in mind

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If players report async behavior i will patch xD

chrome bay Jul 13, 2019, 10:12 AM

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I guess it just comes down to the specifics really.. like if client switches, triggers a reload before they get corrected etc etc

thin stratus Jul 13, 2019, 10:12 AM

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We can't reload anyway

chrome bay Jul 13, 2019, 10:12 AM

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or fires 😄

thin stratus Jul 13, 2019, 10:12 AM

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Might check that I guess

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But Clients only do FX anyway I guess

chrome bay Jul 13, 2019, 10:13 AM

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Interesting idea though for sure

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yeah

thin stratus Jul 13, 2019, 10:13 AM

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So if they shoot a linetrace and spawn a hit fx on a laggy day before getting corrected, then so be it

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That would happen technically anyway, if I only let the server do the switch

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Would need to lock them

chrome bay Jul 13, 2019, 10:15 AM

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yeah.. i have my tank game thing open atm so I can only speak to that but I have a bit of a different setup there anyway because it's the firing group rather than the weapon which is what matters when it comes to equipping etc.

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so equipping is all handled locally, it's just the firing group that replicates

thin stratus Jul 13, 2019, 10:15 AM

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Right, yeah it's not that "complex" here

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I'm already happy that I have everything predicted that the player can do with a weapon

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Was just wondering if the OnRep situation when predicting has a clever solution

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Cause for one you want to skip the owner

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cause they predict

chrome bay Jul 13, 2019, 10:16 AM

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Yeah I might try it and see how it behaves for funsies

thin stratus Jul 13, 2019, 10:16 AM

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but then if the Server corrects etc. or the whole stuff is just executed server only (first spawn of the weapons!) then you need it again

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I guess conditions can't be overridden on the fly for a replicated variable?

chrome bay Jul 13, 2019, 10:17 AM

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I don't think so as the rep driver gathers all that stuff at startup

thin stratus Jul 13, 2019, 10:17 AM

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e.g. skip owner in general, but not if bIsFirstSpawn is true

chrome bay Jul 13, 2019, 10:18 AM

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I also found out to my detriment that you can't set replication conditions/toggles in an actor component, unless it's a class BP

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Which is super annoying for my weapons because they're almost all built up of components

thin stratus Jul 13, 2019, 10:18 AM

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Oh?

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DOREPLIFETIME_ACTIVE_OVERRIDE( ACharacter, RepRootMotion, true );
That stuff exists

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but not sure if that exists for condition toggling

chrome bay Jul 13, 2019, 10:19 AM

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yeha lemme find an example a sec. going off topic a bit..

thin stratus Jul 13, 2019, 10:19 AM

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Might only be on/off switch

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:D still all multiplayer

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There is probably someone just monitoring this channel, sucking up all the info and knowledge xD

chrome bay Jul 13, 2019, 10:20 AM

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if (bReplicateBursts) { DOREPLIFETIME_CONDITION(UHT_OrdnanceModule, BurstCounter, BurstReplicationCondition); }
So that was originally in an actor component - but it only checks to bReplicateBursts value on the CDO not the actual instance I've created in an actor component

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What I didn't realise is GetLifetimeReplicatedProps is actually called on the CDO not the instance

thin stratus Jul 13, 2019, 10:21 AM

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Right, but what about the active override then?

chrome bay Jul 13, 2019, 10:21 AM

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Yeah I can use ACTIVE_OVERRIDE - I just didn't want to 😄

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premature optimization and all that...

thin stratus Jul 13, 2019, 10:21 AM

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ha

chrome bay Jul 13, 2019, 10:22 AM

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But it's kind of annoying as some weapons only care about the burst counter for certain connections since they might do something differnet locally, but if I want to set that it has to be in a component sub-class

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Since I don't think there's an override for conditions 😦

thin stratus Jul 13, 2019, 10:22 AM

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Yeah doesn't seem so

chrome bay Jul 13, 2019, 10:22 AM

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Just whether it's active or not

thin stratus Jul 13, 2019, 10:23 AM

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Oh

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#define DOREPLIFETIME_CHANGE_CONDITION(c,v,cond) \
{ \
    static UProperty* sp##v = GetReplicatedProperty(StaticClass(), c::StaticClass(),GET_MEMBER_NAME_CHECKED(c,v));    \
    bool bFound = false;                                                                                            \
    for ( int32 i = 0; i < OutLifetimeProps.Num(); i++ )                                                            \
    {                                                                                                                \
        if ( OutLifetimeProps[i].RepIndex == sp##v->RepIndex )                                                        \
        {                                                                                                            \
            for ( int32 j = 0; j < sp##v->ArrayDim; j++ )                                                            \
            {                                                                                                        \
                OutLifetimeProps[i + j].Condition = cond;                                                            \
            }                                                                                                        \
            bFound = true;                                                                                            \
            break;                                                                                                    \
        }                                                                                                            \
    }                                                                                                                \
    check( bFound );                                                                                                \
}

#

Nice highlighting there

chrome bay Jul 13, 2019, 10:23 AM

#

haha

#

Yeah I think you can only change that in sub-classes within GetLifetimeReplicatedProps

#

I don't think you can change it once it's been setup

thin stratus Jul 13, 2019, 10:23 AM

#

So not runtime?

chrome bay Jul 13, 2019, 10:23 AM

#

yeah

thin stratus Jul 13, 2019, 10:23 AM

#

(╯°□°）╯︵ ┻━┻

chrome bay Jul 13, 2019, 10:23 AM

#

I guess it's to do with how it builds the RepLayout stuff

#

but I didn't dig in too far

thin stratus Jul 13, 2019, 10:24 AM

#

I mean I guess it makes sense if you need it changed in the child

chrome bay Jul 13, 2019, 10:24 AM

#

Yeah

#

I guess if you're changing conditions all the time you need to handle it some special way anyway

ornate crescent Jul 13, 2019, 11:43 AM

#

Hi, i have some problems/crash, when i try to equip a item from inventory.
I have
TArray<UItemBase*> Inventory

When i equip the item to the character i add the pointer to the character weapon pointer

UItemBase* WeaponEquipped

But when i equip and i set the Inventory[0] (the weapon is from the position 0 of the inventory) i set to nullptr and my game crash

#

well is my approach of the inventory system :/

chrome bay Jul 13, 2019, 11:51 AM

#

There's probably nothing at Inventory[0]. If the array index doesn't exist, it'll crash.

#

Error probably says something about being out of bounds.

elfin veldt Jul 13, 2019, 12:32 PM

#

Still fighting with this months later, I'm a bit daft but I'm still trying, Anyone able to help me figure this one out? Basically in the player controller I have an enum variable that determines which team the player is on, but I'm trying to access it elsewhere an can't for the life of me figure out how to work this.

📎 unknown.png

#

I'm screwing with just two players for the time being, trying to get the opponent location checking if there's anyone on the opponent's team and if so, then find the location of their pawn .

#

...

#

hold on, I think I'm just stupid

#

Or Maybe I've got absolutely no Idea what I'm doing, w.e back to the lab.

📎 unknown.png

green cedar Jul 13, 2019, 1:27 PM

#

Can you expose an arbitrary webservice endpoint using an Unreal Plugin?

#

I'm looking at ways to accept inputs from something other than an Unreal client

#

I know I could use Unreal and poll somewhere to derive input

#

But I am curious to see if anyone has had to accept non-Unreal client inputs as inputs before

#

If that makes sense?

#

Something similar to the Jackbox implementation, where the player input/'client' is just an HTML/Javascript page

#

Is what I am considering

#

I know I can use the REST extensions and an intermediary webservice (written in any language, really) that the Unreal 'server' would poll at intervals to accomplish, but I was hoping to remove the need for the intermediary webservice

nocturne berry Jul 13, 2019, 5:01 PM

#

is it possible to put my game in steam without using their subsystem?

if yes then what should i keep from the below setup in my DefaultEngine.ini?

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

[OnlineSubsystem]
DefaultPlatformService=Steam

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480

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

unique thunder Jul 13, 2019, 6:45 PM

#

Is it possible to replicate an animation blueprint separately for local and others?
For example: I want to modify the transform of a bone for myself, but not for others.

limber mortar Jul 13, 2019, 6:55 PM

#

This clears foliage but lags with my 1 million instances on the level. Is there a better way to handle the removal/indexes? I also tried a direct trace with break hit, removing the hit item and hit index. Same lag, and on a blank new project.

📎 unknown.png

#

If I only have 10k foliage on the map its no big deal. Here is the notify function, basic

#

📎 unknown.png

ember needle Jul 13, 2019, 8:18 PM

#

does anyone know if the vehicle movement component has prediction?

narrow prairie Jul 13, 2019, 8:39 PM

#

Im wondering something; i made a actor BP_ and added a couple of child actors on the static mesh. all set to replicated. If i play the game in pie (everything works as expected) however if i play trough online, the child actors are not visible on the client side. (Hello btw im new to the unreal community)

#

I can reproduce the issue with the pie, if i disable the net load on client - on the BP

#

how do i get the clients to also see the child actors trough internet play; what am i missing... is there anyone who can guide me in the right direction?

glad sedge Jul 14, 2019, 12:02 AM

#

GameMode doesn't use Beginplay via CPP?

gleaming niche Jul 14, 2019, 12:46 AM

#

gamemode uses startplay, which calls beginplay for everything.

#

and IIRC, stuff created on the server that is replicated, does not do beginplay on client. but if something is created on client-side, it does call beginplay.

#

if it's placed in the map, and bNetLoadOnClient = true (which is default) it will

worthy perch Jul 14, 2019, 12:52 AM

#

Replicated actors created on the server do play BeginPlay on client.

gleaming niche Jul 14, 2019, 12:53 AM

#

the last one i did, didn't. i had to override PostNetInit becuase beginplay never called

#

when the thing was spawned at runtime

#

it called on server, but not client

#

so maybe thats a bug then

#

playercontrollers also don't do beginplay on client

worthy perch Jul 14, 2019, 12:55 AM

#

Hmm, let me test. Because, aside from PlayerControllers, I'm 99.9% sure BeginPlay is called on both in all cases.

gleaming niche Jul 14, 2019, 12:56 AM

#

as i said, if it's in the map, ans bNetLoadOnClient is true, it does.

#

because it gets called from UWorld

worthy perch Jul 14, 2019, 12:56 AM

#

I mean, even spawned at runtime.

#

Because PostNetInit calls BeginPlay which is pretty much for clients to init stuff. Currently testing.

gleaming niche Jul 14, 2019, 12:59 AM

#

yeah i see that it's supposed to

#

so it must be a bug when it doesnt happen

#

cuz i've had it that way many times, where it just doesn't.

worthy perch Jul 14, 2019, 1:01 AM

#

Yeah, just from reading some stuff on this Discord, there were some people having issues, particularly with Listen Servers, BeginPlay having strange behavior.

#

Anyway, from my testing just with Dedicated Server + Client in PIE, BeginPlay is played on PCs and a child of AActor.

gleaming niche Jul 14, 2019, 1:02 AM

#

like ActorHasBegunPlay is already in 'hasbegunplay' state or somehting

#

so it must just be broken in listen then

#

cuz i have this same issue with one of my VR games, which is NOT doing multiplayer in PIE, and only from an actual build.

#

but, one is listen, other is client.

worthy perch Jul 14, 2019, 1:05 AM

#

I think it's just with that engine version. I'm on 4.21, and PIE with 2 clients (1 listen server + net client), BeginPlay is firing on both server and client.

gleaming niche Jul 14, 2019, 1:05 AM

#

client doen't get beginplay

#

sometimes

#

usually never

worthy perch Jul 14, 2019, 1:05 AM

#

Oh, damn. Listen Server stuff always seem to have problems.

gleaming niche Jul 14, 2019, 1:12 AM

#

i wonder if it coul dbe the fact that ActorHasBegunPlay is never initialized by default

#

it's just assumed to be 0 / HasNotBegunPlay

#

on monday i'll modify engine and test the VR thing.

worthy perch Jul 14, 2019, 1:21 AM

#

Probably check with other engine versions if they handle that variable differently before you modify the engine.

gleaming niche Jul 14, 2019, 1:21 AM

#

well ive seen this issue from 4.19 to 4.22

#

and i dont believe it's changed.

#

it's just not iniialized anywhere in Actor.cpp

glad sedge Jul 14, 2019, 1:35 AM

#

Hmm I think it had something to do with my logs

#

Do you guys test dedicated servers via the editor or spin up a separate server? I'm pretty early in, so I just want to verify multi is calling the right stuff.

worthy perch Jul 14, 2019, 1:44 AM

#

Both.

#

Well, I mean, you can test PIE (for most things) for development, and when you're done with something, test in a packaged build.

#

Particularly shipping is useful too.

glad sedge Jul 14, 2019, 1:46 AM

#

Yeah I figured. Man I haven't touched Multi in about a year. I'm so rusty

limber mortar Jul 14, 2019, 2:09 AM

#

anyone successfully used remove instance on foliage with 1,000,000 plus meshes on the map?

glad sedge Jul 14, 2019, 3:53 AM

#

Hmm how do you guys go about setting references on the PC to actors?

#

In my case, the server is setting a reference to a ball. For certain functions, I want to reference that ball to do some line tests tec. In my case, if the reference is being set by the server, it's not being set via the client. So client functions fail that require that actor's reference.

#

Should I set a reference on both client and server, do you think?

glad sedge Jul 14, 2019, 4:15 AM

#

Ohh maybe I use RepNotify

#

Nah

glad sedge Jul 14, 2019, 7:36 AM

#

        void Server_MoveForward(float Axis);

    UFUNCTION(Client,reliable)
        void Client_MoveForward(float Axis);

    void MoveForward(float Axis);```

#

If I use NetMulticast (on server), is that the same as calling both of these?

bitter oriole Jul 14, 2019, 7:37 AM

#

https://docs.unrealengine.com/en-US/Gameplay/Networking/Actors/RPCs/index.html

RPCs

Designating function replication across the network

#

Look at the tables

glad sedge Jul 14, 2019, 7:38 AM

#

hmm damn.

#

What i had before should have worked.

#

I had a server calling a netmulti on the MoveForward function - the variables inside weren't updating on the client.

somber glade Jul 14, 2019, 9:04 AM

#

I have an interface on a door. There is a door access panel that has a reference to that door (configured in the instance). When the correct object overlaps it, it unlocks the door and kicks off a timeline to slide the door open. The interface call doesn't have the option of being run on server or replicated or anything like that. The door actor and the components are replicated, as are all the variables. Do I need to create another event on the door itself to be run as server and replicated when that door opens? So interface event->Runonserverevent->Timeline->set actor location

#

which one is properly replicated for MP?

📎 rep.png

visual cosmos Jul 14, 2019, 9:19 AM

#

Quick question, which approach would be better replication wise: adding new attached actors to a character as weapons, or adding said weapons as actor components and additional mesh/audio/effect components spawned into the character itself? 🤔

pallid mesa Jul 14, 2019, 10:42 AM

#

Very good Q.

#

In my honest opinion I preffer to have weapons as separate actors since the weapons could have multiple actor components by themselves, to decouple logic.

#

But it all depends on the scope you are aiming at, there is not really an universal solution which will be the best and work out of the box for every single project

#

Its per case basis

#

@visual cosmos

worthy perch Jul 14, 2019, 10:47 AM

#

It doesn't really affect net bandwidth, though. They should be quite similar. The difference is negligible regardless, isn't it?

#

Does adding a replicated actor to another actor use the parent actor's net settings?

pallid mesa Jul 14, 2019, 10:48 AM

#

Well there are further implications

#

You have fine grain control on replication settings

#

Such as using owner relevancy and so forth

#

But in this case, net performance shouldnt be your concern

#

Although with weapons as separate actors you can do really cool things with network culling based on weapon shoot distance

#

So.. yeah, first study how your game is

#

And based on that, take decisions

visual cosmos Jul 14, 2019, 10:59 AM

#

Hmm, thanks for the answer. Guess its separate actors then, since those proved to be way easier to swap around dynamically.

glad sedge Jul 14, 2019, 11:22 AM

#

Does the AIController not get created by the pawn?

pallid mesa Jul 14, 2019, 11:25 AM

#

yes on startup and if defined on the class

#

once you possess the pawn the aicontroller gets dropped

#

and on unpossess you have to re-add it with "add default controller"

glad sedge Jul 14, 2019, 11:26 AM

#

Looks like my client can't find the controller that's associated with the pawn.

#

However, I am creating the pawns on the server (which I figured was standard), so maybe I have to explicitly get them from server to client when accessing the AIController.

#

Which kinda makes sense.

#

I assumed the Pawn would automatically replicate the AIController on the client.

pallid mesa Jul 14, 2019, 11:29 AM

#

In my case I Spawn the default controller on the server

#

and I've got no issues

#

actually the cmc shows that, since without a controller you can't server rpc movement changes

#

take a better look to your system and debug it because maybe an external behaviour is causing an incongruence there

glad sedge Jul 14, 2019, 11:33 AM

#

ah I'm using the float pawn movement, but movement isn't the issue for me in this case, it's the blueprint animation

#

Ah

#

AIControllers do not exist on clients by design.

#

In my case I have a PC that references an AI Controller, but doesn't possess them.

pallid mesa Jul 14, 2019, 11:51 AM

#

PC's exist on the server and owning client so knowing that... you should change your logic, maybe it's better to reference the pawn instead

chrome bay Jul 14, 2019, 11:51 AM

#

Only the local player controllers exist on clients, that's a UE4 multiplayer fundamental.

pallid mesa Jul 14, 2019, 11:52 AM

#

when you said clients I thought of the owning client out of the box I don't know why.

#

btw James, do you have an answer for the world origin shifting and physics?

#

I still have the doubt

chrome bay Jul 14, 2019, 11:53 AM

#

My answer is don't use it

#

Origin shifting is shit

#

Caused us nothing but constant problems

#

PhysX doesn't like the origin being yeeted away at the game threads discretion

pallid mesa Jul 14, 2019, 11:54 AM

#

oof...

#

really..

#

well rip client jitter caused by precision solution

chrome bay Jul 14, 2019, 11:54 AM

#

If you want to use it, you have to handle teleporting the constraints and bodies as well, and resetting any smoothing etc.

#

To be honest that's just the beginning of my issues with the way origin rebasing has been implemented

#

but IIRC it was a pull request, Epic themselves didn't implement it

pallid mesa Jul 14, 2019, 11:55 AM

#

I see... well let's see how the vehicle plays in like 6km away from W.O

#

that's a shame

chrome bay Jul 14, 2019, 11:56 AM

#

Probably not very well I would guess.. but yeah it's not a walk in the park

#

Maybe Chaos will make life easier in that regard

#

But a while to wait for that yet

pallid mesa Jul 14, 2019, 11:56 AM

#

hopefully, anyways thanks for the info 😄

chrome bay Jul 14, 2019, 11:56 AM

#

np's, wish I could say something more useful haha

pallid mesa Jul 14, 2019, 11:57 AM

#

heheh xD at this point that's enough

glad sedge Jul 14, 2019, 11:57 AM

#

dumb newb question, but animations should run on client, right? So my design should be to replicate any varibles that'd impact animation movement (velocity et al) and perform that on the client?

#

I've got animation running on the server, just not seeing it via the client

pallid mesa Jul 14, 2019, 11:58 AM

#

you gotta be sure your simulated proxies get the information, so yes.

#

but remember, instead replicating a lot of variables for different things

#

if you have the velocity replicated you can calculate with that the direction, the horizontal velocity and the vertical velocity

glad sedge Jul 14, 2019, 12:06 PM

#

good point

#

Maybe my setup isn't great. I've got a number of AI, PC references the AI it wants to control, and then sends various inputs through the PC to the AI

pallid mesa Jul 14, 2019, 12:08 PM

#

maybe you could change a bit the paradigm trying to decouple your own PC from the AI Controller

#

or.. from the server you can always send a message to the owning client of that actor

#

but If I got right your system, I would actually re-think the overall setup

glad sedge Jul 14, 2019, 12:11 PM

#

maybe it's possible to follow the 'possess' and 'unpossess' of the pawns, and leave the AIControllers to.. well AI

pallid mesa Jul 14, 2019, 12:11 PM

#

possess and unpossess are server sided only on BP.

glad sedge Jul 14, 2019, 12:12 PM

#

It's a sports game, like fifa, so it's not like I'm controlling more than one at any given time.

pallid mesa Jul 14, 2019, 12:12 PM

#

that sounds fun hehe

glad sedge Jul 14, 2019, 12:12 PM

#

8\

#

Yeah, the emerging rugby market. whoo.

#

I can't seem to get the replicated AI Controller to work on client, even if I replicate it via BP.

pallid mesa Jul 14, 2019, 12:13 PM

#

😄 either way, try to go back to the drawing board and come up with decoupled ideas if posible

glad sedge Jul 14, 2019, 12:13 PM

#

(i'm in cpp mostly)

pallid mesa Jul 14, 2019, 12:14 PM

#

oh no, BP or not, the replication shenanigans are kind of similar

#

the good thing on C++ is that you can know on the client when a pawn has been possessed

#

just look around to the different onrep functions

glad sedge Jul 14, 2019, 12:17 PM

#

TBH, I'm not having any big dramas with AIC and pawns.

#

I think my lack of knowledge is hurting, so I'll keep reading. I'm sure I'm doing something silly.

narrow prairie Jul 14, 2019, 12:22 PM

#

Ive figured out the issue with the child actors not beeing shown trough network play

#

On the BP_ i setted the net load client to false

#

and also on the child bp actors that are attached to the parent bp

#

now when i play trough internet the child actors appear as intented

#

internet play btw

#

trough pie it was no issue

#

when i did standalone steam play the client didnt see any child actors

somber glade Jul 14, 2019, 12:30 PM

#

Do I more or less have this correct and what the intended purpose is behind each function?

📎 mp2.png

narrow prairie Jul 14, 2019, 12:32 PM

#

on input event, tell server that u are firing

#

server tells everyone to update that u shot

somber glade Jul 14, 2019, 12:33 PM

#

So when exactly should you simply run on server vs doing a multicast?

narrow prairie Jul 14, 2019, 12:33 PM

#

the input even above the 2nd calls locally

#

after the multicast

#

u check if it is locally controlled

#

if its false

somber glade Jul 14, 2019, 12:33 PM

#

I mean in what usage scenarios should you be running on server vs multicasting

narrow prairie Jul 14, 2019, 12:34 PM

#

mulitcast is the visual part so to speak

#

the run on server makes sure no ones cheats

#

so thats why its checking locally

somber glade Jul 14, 2019, 12:34 PM

#

So if I have a door panel, with a material on that changes color if it's locked. My character unlocks it. I use a "run on server" to set the bool that it's been unlocked and that bool is replicated. So in that case I don't need multicast right?

narrow prairie Jul 14, 2019, 12:34 PM

#

so its not triggering twice on the multicast

#

agreed

somber glade Jul 14, 2019, 12:35 PM

#

So what is it about shooting that makes me need multicast?

narrow prairie Jul 14, 2019, 12:35 PM

#

u need a repnotify for the material change

#

ive found out

#

since everyone needs to see the same visuals

#

like projectile

somber glade Jul 14, 2019, 12:35 PM

#

ah okay, so things like muzzle flare and sounds?

narrow prairie Jul 14, 2019, 12:35 PM

#

but the actual ionput

#

is run on server

#

the server decides if u can shoot

#

if u have enough rounds for example

#

multicast for that

#

some things dont even work with multicast ive found out

#

ive found out that i coudnt change a material on multicast

#

but could with a repnotify

somber glade Jul 14, 2019, 12:37 PM

#

So if I have a sliding door that's controlled on a timeline. The door itself is replicated, should that timeline be called with a run on server or a multicast because I want everyone to see it? Do they need to run that code, or do they simple need to receive the replicated actor to see it moving?

narrow prairie Jul 14, 2019, 12:38 PM

#

run on server

#

since the timeline is replicated and the door

#

its a bit confusing i know

#

i still have a real hard time grasping it myself

#

if i say anything wrong, perhaps some experts here can come in and adress my mistakes

#

im just saying what i found out trough own experiment

#

the server owns the door

#

so there is no need for a multicast

#

1 timeline is enough with replicated

#

and the actor that has to move has to be replicated and replicated movement

somber glade Jul 14, 2019, 12:40 PM

#

back to the shooting, if you're shooting a physical thing the rep of the bullet is handled by the server. It spawns it and sends it out to all the clients right? The multicast is really only handling the stuff like flare and sounds?

narrow prairie Jul 14, 2019, 12:40 PM

#

yes

somber glade Jul 14, 2019, 12:40 PM

#

and if it were a skeletal mesh weapon that moved it would handle that as well?

narrow prairie Jul 14, 2019, 12:40 PM

#

yes

#

but i think it depends who is the owner

#

ownership i dont understand much

#

who spawns in the actor

#

etc

#

most time u want to spawn actor on server

#

that is replicated

#

u dont have to do anything about that

#

todd howard would say

#

it just works

#

though i can be completly wrong

#

since im also still struggling with my multiplayer game

#

i have a issue for example

#

the input is run on server

#

then it needs to remove item from client

#

and open door for example

#

ive got no idea how to set that up

#

lool

#

i got it working on server

#

but the client halts at remove item

#

then i need a check if i removed item

#

and then unlock the door

somber glade Jul 14, 2019, 12:45 PM

#

Okay so A good rule of thumb is if there is no visual effects, run it on the server only

#

and let it replicate out itself

narrow prairie Jul 14, 2019, 12:45 PM

#

yes

somber glade Jul 14, 2019, 12:45 PM

#

Okay I think I got that

narrow prairie Jul 14, 2019, 12:45 PM

#

remember that the actor has to be replicated

#

and if it needs to move

#

replicate movement

#

hope i helped u a bit

somber glade Jul 14, 2019, 12:47 PM

#

movement..that means like character movement right?

#

Not just setting the actor location?

#

@narrow prairie Yes, that was a big help 😃

narrow prairie Jul 14, 2019, 12:47 PM

#

the character is allrdy owned on the server

#

u own the player controller

#

so movement is allrdy replicated

#

u dont control the character locally

#

u run in on server

#

its what u see

somber glade Jul 14, 2019, 12:48 PM

#

What I mean is, like a character itself which has a character movement component you rep movement on that.

narrow prairie Jul 14, 2019, 12:48 PM

#

its allrdy replicated

somber glade Jul 14, 2019, 12:48 PM

#

but a static mesh that you move around with "set actor location" does that need movement rep?

narrow prairie Jul 14, 2019, 12:49 PM

#

u dont have to to anything for character movement out of the box

#

if u play in PIE editor

#

2 player

somber glade Jul 14, 2019, 12:49 PM

#

is that "moving" or is it just having it's location set.

narrow prairie Jul 14, 2019, 12:49 PM

#

u can walk around like no problem

#

u move on the server

#

server tells everyone u moed

#

moved

#

its allrdy replicated

#

u only have to tell server that u increased sprint speed

#

and do that locally too

#

otherwise u warp

somber glade Jul 14, 2019, 12:50 PM

#

Okay thanks 😃

narrow prairie Jul 14, 2019, 12:50 PM

#

since u out of sync with server

#

and ur own location

#

i would start out really small

#

and try do some stuff

#

like for example sprint function

somber glade Jul 14, 2019, 12:53 PM

#

I've already got a fair bit done, I'm just wondering about some of these more advanced functions 😃 My lobby and start game is already pretty much working and fully replicated. But now i'm moving on to things like abilities

#

and a little less sure about those

narrow prairie Jul 14, 2019, 12:53 PM

#

ye

#

did u do the wes multiplayer tutorial?

somber glade Jul 14, 2019, 12:55 PM

#

I did most of tom looman's one.

#

I got tied up about 50% of the way through the last unit

#

That was also like 7 months ago, so not everything is fresh haha 😉

narrow prairie Jul 14, 2019, 1:04 PM

#

btw take everything i said with a grain of salt, i only started coding myself 7 months ago

#

working on a zombie game

#

coop

#

im gonna be afk and work on my project

#

gl man

somber glade Jul 14, 2019, 1:07 PM

#

no worries, big help. thanks 😃

meager spade Jul 14, 2019, 2:00 PM

#

everyone makes zombie games 😄

clear sand Jul 14, 2019, 2:39 PM

#

Any tutorials on how to create a server side for multiplayer? Coming from web development, so could use some advice

limber mortar Jul 14, 2019, 4:10 PM

#

building the server once the game is done, or making the game in unreal engine to run off a server?

#

I used the epic guide to make my dedicated server once I finished the game, it worked, I just had to cook the server version of my game in the project launcher first. I successfully used it this year on UE4 4.19 making my first game:

https://wiki.unrealengine.com/Dedicated_Server_Guide_(Windows_%26_Linux)

If you're looking at making the game itself ready for multiplayer I'd check these out:

https://www.unrealengine.com/en-US/blog/blueprint-networking-tutorials
http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

#

Does anyone recognize this variable, I can't seem to find it. I'm trying to remove small bits of foliage from a 1 million unit array and wanted to try this.

📎 unknown.png

limber mortar Jul 14, 2019, 4:46 PM

#

I see BuildTreeIfOutdated, guess it could be this person's custom variable but it isn't on his page anywhere else so I was just googlin

gloomy sedge Jul 14, 2019, 4:48 PM

#

Hey, I've been trying to get Steam Friends integrated into my project for a couple days now, and have stumbled across a problem with the Friends Game info. Following the tutorial posted buy Cedric. i have created the c++ classes needed for this. The problem is that i am not getting the Generated.h files needed,

📎 unknown.png

#

I have Right clicked on the .uproject and generated Vs project files

#

and this has not worked

#

I have Rebuilt the project from VS and this hasn't worked

#

📎 unknown.png

#

I wonder if this is the reason for the failure to create the generated files

#

And i realise this is in the wrong chat. Nevermind. I'll move it over

thin stratus Jul 14, 2019, 5:17 PM

#

Does the ProjectileComponent perform any smoothing on the clients?

#

Most likely doesn't need it I guess cause it's flying on both anyway and will sync if the server repliates the location

thin stratus Jul 14, 2019, 6:00 PM

#

Can you force a RepNotify? As in if a boolean is false, and I set it to false again, can I force this to apply and replicate?

#

Ah will just make sure the projectile starts deactivated

limber mortar Jul 14, 2019, 6:04 PM

#

Can you loop your replicated actions n amount of times you want it to be false?

thin stratus Jul 14, 2019, 6:04 PM

#

Was more about me doing some stuff if bIsActive is false, and I was setting that when spawning the projectile but bIsActive starts false

#

But setting it completely to be "deactivated" at the start is better anyway

chrome bay Jul 14, 2019, 6:05 PM

#

You can do DOREPLIFETIME_CONDITION_NOTIFY and specify REPNOTIFY_Always

thin stratus Jul 14, 2019, 6:06 PM

#

If I set a replicated variable and after that set Replicated to false, will that still replicate the variable before turning off replication for that actor?

chrome bay Jul 14, 2019, 6:06 PM

#

That will force the OnRep function to be called whenever the property is received from Server, even if it's the same as the current value

thin stratus Jul 14, 2019, 6:06 PM

#

Thanks!

chrome bay Jul 14, 2019, 6:06 PM

#

(Same value on the client that is I meant)

#

On the server it would still have had to change between replication frames

thin stratus Jul 14, 2019, 6:06 PM

#

So I guess not?

#

Would love to turn off replication for deactivated projectiles

#

But not sure if that's even needed

chrome bay Jul 14, 2019, 6:07 PM

#

bTearoff maybe?

#

Assuming you're not pooling them that is

thin stratus Jul 14, 2019, 6:07 PM

#

That would get rid of it completely

#

Yeah it's about pooling

#

Never set that up and checking what I can all deactivate etc

#

void AHLProjectile::ActivateProjectile(const FHLProjectileSetupInfo& ProjectileSetupInfo)
{
    bIsActive = true;
    OnProjectileActivated();
    SetActorTransform(ProjectileSetupInfo.FireTransform);
    WeaponInfo = ProjectileSetupInfo.WeaponInfo;
}
void AHLProjectile::DeactivateProjectile()
{
    bIsActive = false;
    OnProjectileDeactivated();
    SetActorTransform(FTransform::Identity);
    WeaponInfo = FHLWeaponInfo();
}

void AHLProjectile::OnProjectileActivated()
{
    SetActorTickEnabled(true);
    RootSphereComponent->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
    if (GetNetMode() != NM_DedicatedServer)
    {
        ProjectileMeshComponent->SetVisibility(true);
        TrailParticleComponent->Activate(true);
        ProjectileMovementComponent->Activate(true);
    }
}
void AHLProjectile::OnProjectileDeactivated()
{
    SetActorTickEnabled(false);
    RootSphereComponent->SetCollisionEnabled(ECollisionEnabled::NoCollision);
    if (GetNetMode() != NM_DedicatedServer)
    {
        ProjectileMeshComponent->SetVisibility(false);
        TrailParticleComponent->Deactivate();
        ProjectileMovementComponent->Deactivate();
    }
}

chrome bay Jul 14, 2019, 6:08 PM

#

I'm using net dormancy for that... but I'm yet to check if it actually works 😄

thin stratus Jul 14, 2019, 6:09 PM

#

Tick, Collision and visible stuff

#

And moving the projectile to 0,0,0

#

cause why not

#

Might actually rather teleport it

#

Oh, on another note: How common is it to check with a trace if you are very close to something and then simulating the shot instead of actually using a projectile?

chrome bay Jul 14, 2019, 6:14 PM

#

Good Q not actually sure tbh

#

I'm currently still using actual projectiles for everything

#

but I've really gotta make a more rapid-fire-friendly trace based projectile thing

thin stratus Jul 14, 2019, 6:14 PM

#

I just reimplemented fast shots as linetraces with prediction and simulation for the rest of the clients

#

And that works nicely

#

Now refactoring the projectile

#

And wondering if I should add the initial trace back that check if we need the projectile

#

But that was without pooling

chrome bay Jul 14, 2019, 6:15 PM

#

Yeah that's one of my future things I need to do again

thin stratus Jul 14, 2019, 6:15 PM

#

Also added some RandomStream replicated spread

#

Which was easier than I thought

#

How do people actually do projectiles that can hurt the player but at the same time don't initially overlap the player by mistake?

#

Just spawn it far away enough and hope the player doesn't notice?

#

Man I hate projectile based weapons

graceful cave Jul 14, 2019, 6:17 PM

#

you can disable collision with the owning character until overlap ends

#

or spawn it further away from them and set the location of the visual component at the gun while the collision component is at the true location

#

and interp the mesh back to the collision

chrome bay Jul 14, 2019, 6:19 PM

#

I do dis

thin stratus Jul 14, 2019, 6:19 PM

#

Not sure how collision disabled and "until overlap ends" goes hand in hand

#

:D

chrome bay Jul 14, 2019, 6:19 PM

#

📎 dis.JPG

#

Also, I change the collision profile of the projectiles when they actually sweep as I was getting sick of physics stuff bouncing off them -.-

thin stratus Jul 14, 2019, 6:20 PM

#

Right, but what is "OwnerIgnoreTime"?

chrome bay Jul 14, 2019, 6:20 PM

#

Just a float

thin stratus Jul 14, 2019, 6:20 PM

#

No I mean, how long

chrome bay Jul 14, 2019, 6:20 PM

#

so < 0 means ignore so long as it's active

#

0 = never ignore

#

0 = ignore for a bit then unignore later

graceful cave Jul 14, 2019, 6:20 PM

#

not necessarily collision disabled but when it spawns, have a bool flagged true if its overlapping the owner and set it false when that overlap ends

#

if it overlaps the owner when its true, dont consider it a hit

thin stratus Jul 14, 2019, 6:20 PM

#

We are most likely working with HIT not Overlap

#

So the Projectile is set to produce hit effects

chrome bay Jul 14, 2019, 6:21 PM

#

Yeah I use hits for projectiles

#

too damn expensive to move them and update overlaps each frame too

graceful cave Jul 14, 2019, 6:21 PM

#

i use hits for world but overlaps for characters

chrome bay Jul 14, 2019, 6:21 PM

#

depending on how many you have of course

thin stratus Jul 14, 2019, 6:21 PM

#

Too many

#

xD

chrome bay Jul 14, 2019, 6:21 PM

#

same 😄

thin stratus Jul 14, 2019, 6:21 PM

#

Na actually not anymore, but still want it to work properly

#

Guess I will see if it even does problems (the overlap it is)

#

If the owner shoots themselves, then I'm gonna revisit your both ideas

graceful cave Jul 14, 2019, 6:22 PM

#

last time i used hits for projectiles, the character would occasionally be pushed really far from the physics

thin stratus Jul 14, 2019, 6:22 PM

#

Not quite sure how you determin the ignore time though, James

chrome bay Jul 14, 2019, 6:22 PM

#

Just an edit defaults only setting atm

#

so it's up to the scrub who makes the weapon to decide how long for 😄

#

But I can always call 'ResetOwnerIgnore' if say, the instigator teleports somewhere or something

thin stratus Jul 14, 2019, 6:23 PM

#

@graceful cave 1. We aren't using Physics, pfui :D 2. Primitives should have a boolean to toggle impulse on damage

chrome bay Jul 14, 2019, 6:23 PM

#

Or when it ricochets off something

thin stratus Jul 14, 2019, 6:23 PM

#

Yeah if the bullet hits a wall it can be clearly turned off to ignore the owner

#

MoveIgnoreActors doesn't that need to be set on either side?

chrome bay Jul 14, 2019, 6:24 PM

#

Yeah I reset it when they bounce off something, so it you shoot a wall and it comes back and hits the owner it's hard luck 😄

#

Ah... so it would

#

but I'm being crafty

#

I've overridden projectile move component

#

and when the movement is ticking, I change the collision profile

#

then at the end of the tick I set it back again

#

So when it's "not moving" that frame, it doesn't overlap other stuff which is moving

#

So a projectile can fly into something... but the something cannot fly into the projectile if that makes sense

#

a kind of hack to make collision one-way

thin stratus Jul 14, 2019, 6:26 PM

#

Haha what a cheat

chrome bay Jul 14, 2019, 6:26 PM

#

Works for now 😄

thin stratus Jul 14, 2019, 6:26 PM

#

Although it being both ways is stupid in my eyes anyway

#

The stuff should check if either has the other in the array and then ignore

#

Epic please

chrome bay Jul 14, 2019, 6:26 PM

#

Well it was a pain, because physics would think I was smacking into it each time I spawned it

#

So everytime I fired, tank would hit the floor or something

#

was v stupid

thin stratus Jul 14, 2019, 6:26 PM

#

Ha nice

chrome bay Jul 14, 2019, 6:26 PM

#

This was the best "fix" I had for that for now...

thin stratus Jul 14, 2019, 6:26 PM

#

Mine just explode

#

But you are applying pushes to the tank

chrome bay Jul 14, 2019, 6:27 PM

#

It wasn't even that, just physics treating it like a kinematic object

thin stratus Jul 14, 2019, 6:27 PM

#

Which is also nice, but with the amount of bullets and fast paced movement that would be annoying i think

#

Not gonna give my client that idea

chrome bay Jul 14, 2019, 6:27 PM

#

So it would think it was hitting a wall... but it was it's own projectile -.-

thin stratus Jul 14, 2019, 6:27 PM

#

Uh

chrome bay Jul 14, 2019, 6:28 PM

#

Trouble is I spawn a lot of my projectiles inside the collision of the vehicle initially

#

So I would spawn it, physics runs, it thinks it "hit" the projectile or is overlapping it, and would eject the tank away from it's own projectile

#

GG physics

#

10/10

thin stratus Jul 14, 2019, 6:28 PM

#

I just happen to move into them after spawning

#

Drone moves faster than projectile

#

xD

chrome bay Jul 14, 2019, 6:29 PM

#

Blah maybe you got lucky with your setup 😄

#

I had to hax

thin stratus Jul 14, 2019, 6:29 PM

#

Idk actually, I really hate my original projectile system

#

I actually coded something like this:

Save SpawnLocation and Direction on BeginPlay
Perform an InitialTrace on the Server from 100 units behind the SpawnLocation to the current location
Fake all the bouncing etc.
If we didn't hit anything, turn the projectile fully on
If we hit something that would destroy the projectile don't activate the projectile and just handle the hit

#

Worked for very close shots where the projectile was acting out cause of delay in spawning or so idk

#

I even had a problem where Client shooting a projectile was working fine but the listenServer hit itself

#

¯_(ツ)_/¯

chrome bay Jul 14, 2019, 6:32 PM

#

hahaha

#

multiplayer

thin stratus Jul 14, 2019, 6:32 PM

#

It doesn't even make sense cause the Collision should also hit the client on the server's end

#

But well

limber mortar Jul 14, 2019, 7:06 PM

#

is foliage the best way to go for grass, if you want a BP overlap to later clear out a small area of grass?

chrome bay Jul 14, 2019, 7:12 PM

#

probs wrong chat room

#

#blueprint or #cpp I guess depending on what you're using

limber mortar Jul 14, 2019, 7:13 PM

#

ah, most the time BP send me here

#

because I am using a dedicated server

chrome bay Jul 14, 2019, 7:14 PM

#

depends, this doesn't sound multiplayer-specific 😃

limber mortar Jul 14, 2019, 7:14 PM

#

I don't know if it is lag due to replication problems 😄

#

I'm year 1, self taught

#

doing alpha testing

#

I want to remove foliage for all, and I want it gone later, so I rep notify the multicast function

📎 unknown.png

#

I guess if the networking looks good I will go to the BP channel, the circled part is the lag inducer, sorry forgot to remove it from my pic

#

I removed the part about level design and using foliage above

#

I'll post elsewhere

tepid ingot Jul 14, 2019, 7:38 PM

#

are there any good tutorials for multiplayer(not steam, normal multiplayer) that use only BP?

tribal shore Jul 14, 2019, 7:47 PM

#

@tepid ingot i personally haven't found any tutorial with has EVERYTHING
but i have been able to find seperated ones each with some data

#

first thing is learning to do replicating

#

start with a project

#

it can be anything, i started with a ball fight project

#

try to put 2 people in there and go from there

#

search youtube for simple tutorials (i currently can't find the videos, sorry)

limber mortar Jul 14, 2019, 7:49 PM

#

https://www.unrealengine.com/en-US/blog/blueprint-networking-tutorials I thought these were good to watch and I'm doing my first game

Unreal Engine

Blueprint Networking Tutorials in Unreal Engine 4

A previous blog post offered a crash course in blueprint networking, but now we’re back with a thrilling six-part mini-series on creating blueprint content that works in a networked game!

tribal shore Jul 14, 2019, 7:49 PM

#

for me the hardest part has been the replication

tepid ingot Jul 14, 2019, 7:49 PM

#

thx

harsh lintel Jul 14, 2019, 10:56 PM

#

In a multiplayer context, I need a widget bp to access functions from a character class, should I pass a reference to the character as a variable or is it okay to just call GetPlayerCharacter?

wary path Jul 14, 2019, 10:57 PM

#

@harsh lintel The Widget BP should have an owning player controller, through that you can access the possessed pawn

harsh lintel Jul 14, 2019, 10:59 PM

#

Thanks there is GetOwningPlayer (controller) and GetOwningPlayerPawn, should I still access it through controller?

wary path Jul 14, 2019, 11:01 PM

#

probably GetOwningPlayerPawn is just a shortcut and internally uses the controller, you could check the engine source

#

@thin stratus regarding your upper question (this time I made sure discord scrolled): Yes Projectile Component performs client smoothing. Actually, this is working very well. You can "misuse" Projectile Component just to have smooth movement actually...

glad sedge Jul 14, 2019, 11:48 PM

#

Hmm one basic thing I'm struggling with is how you get a variable set by the server to replicate to a client's variable. I can't seem to get it via BP, code is fine however.

#

Anything I should read / check on ?

#

I think my issue is that the Pawn Owner I'm accessing via BP Anim is on the server, so even if I create a variable based off the Pawn Owner (AIController ) that's associated with the pawn, it's only accessible via the server.

vapid mortar Jul 15, 2019, 2:46 AM

#

hello guys. i wanna ask some question. how does fortnite setup their server? is it run on dedicated server, the server create session? or player create the session and other players join the host?

meager spade Jul 15, 2019, 2:46 AM

#

imagine a client holding 100 players and playing the game?

#

it uses dedicated servers which spawns up instances on demand

vapid mortar Jul 15, 2019, 2:47 AM

#

how they do that? give command to the dedicated server to create one session?

meager spade Jul 15, 2019, 2:48 AM

#

its quite complicated

#

look up UE4 GameLift

vapid mortar Jul 15, 2019, 2:48 AM

#

because i read in the forum they says that one single instance one session

meager spade Jul 15, 2019, 2:48 AM

#

yes

#

one instance per game

#

so 30 different games would be 30 instances of the server

vapid mortar Jul 15, 2019, 2:49 AM

#

omg

#

how they give command to the server to open up another dedicated server

#

T_T

meager spade Jul 15, 2019, 2:49 AM

#

a powerful dedicated server could hold a good amount of game servers tho

#

Matchmaking system

#

tries to find a running server with space, if no space, and no games, after a while it will create a new instance and shove those players in that

vapid mortar Jul 15, 2019, 2:51 AM

#

is there any tutorial about that?

meager spade Jul 15, 2019, 2:51 AM

#

not that i have seen

vapid mortar Jul 15, 2019, 2:52 AM

#

server open up another dedicated server

limber mortar Jul 15, 2019, 5:10 AM

#

if the main vehicle pawn replicates does the vehicle movement component still need to be set to replicate?

dusty brook Jul 15, 2019, 7:14 AM

#

hi ,i wonder how can i test my VR multiplayer game , this is what i did:

using a game that already works with lan multiplayer, i have added the replication for motion controller -for hands- and tracking of the hmd to the camera for the first player
trying internet creation and joining for sessions didnt work (session did not appear in any other pc, does not matter the order or firewalls / ports )
using hamachi or other virtual lan software didnt make the lan session visible either
any suggestion or test project you have over there?

wary path Jul 15, 2019, 7:41 AM

#

@limber mortar For characters, the character movement component ignores whether you set it to replicated or not. So probably this is the same for vehicles...

limber mortar Jul 15, 2019, 7:53 AM

#

Thanks

dire ivy Jul 15, 2019, 8:03 AM

#

Hi guys

#

I'm trying to make a multiplayer game where there's a "god" on pc joined by various Quest clients in vr. But every time i call the join session on the quest, its finds the session created by pc, the on success is fired on join session, but my player doesn't join the server. (OnPostLogin is not run) Anyone has any experience with this?

karmic briar Jul 15, 2019, 8:40 AM

#

hi anyone can help me"?

#

so im done following this tutorial on replicationgraph https://www.youtube.com/watch?v=7P11RwKfuEM and i donloaded the project and did everything in the vid to setup repgraph for my game i take the template from the project and put it in mine and when i build i got these errors

YouTube

MazyModz

[UE4] Networking - ReplicationGraph (Tutorial & Overview)

In 4.21 the ReplicationGraph was released in Unreal Engine as it had been an experimental feature in 4.20. When I first heard about the ReplicationGraph in 4...

▶ Play video

#

📎 Desktop_Screenshot_2019.07.15_-_16.38.52.77.png

#

📎 Desktop_Screenshot_2019.07.15_-_16.39.37.00.png

#

📎 Desktop_Screenshot_2019.07.15_-_16.39.46.32.png

#

📎 Desktop_Screenshot_2019.07.15_-_16.39.51.48.png

#

anyone know why it gives out the errors?

#

from what i can tell it mad bout this

📎 Desktop_Screenshot_2019.07.15_-_16.42.25.32.png

bitter oriole Jul 15, 2019, 8:42 AM

#

Use the output log window

#

Don't paste screenshots - use pastebin

#

Your issue is probably the prefix

karmic briar Jul 15, 2019, 8:44 AM

#

what should i replace the prefix with?

bitter oriole Jul 15, 2019, 8:45 AM

#

What is your class called exactly ?

#

Not the header, the class

karmic briar Jul 15, 2019, 8:45 AM

#

replication graph its parent is replication driver

bitter oriole Jul 15, 2019, 8:46 AM

#

What is the class name ?

karmic briar Jul 15, 2019, 8:46 AM

#

DAReplicationGraph just like in tut

bitter oriole Jul 15, 2019, 8:47 AM

#

Usually, people call actor classes AProjectNameClassName, and the file is called ProjectNameClassName

#

The issue here is probably the file name

karmic briar Jul 15, 2019, 8:48 AM

#

how do i fix that

#

🤔

bitter oriole Jul 15, 2019, 8:49 AM

#

Rename your class to something that follows the UE4 convention, rename the file, change the includes accordingly, regenerate the solution and build

chrome bay Jul 15, 2019, 8:59 AM

#

@limber mortar If you want a component to replicate, it has to have the replicate flag set. Otherwise it won't.

#

The actor has to be replicating as well as the component.

#

If the actor doesn't replicate the component won't either.

thin stratus Jul 15, 2019, 10:57 AM

#

@wary path Thanks!

glad sedge Jul 15, 2019, 12:11 PM

#

@thin stratus that guide you wrote is great, btw

glad sedge Jul 15, 2019, 12:32 PM

#

Still wrapping my head around simulated proxies, but I -think- I understand the use-case.

wary path Jul 15, 2019, 12:48 PM

#

@chrome bay but character movement replicates always even if character movement component replication is disabled

chrome bay Jul 15, 2019, 12:49 PM

#

Because it doesn't replicate anything, it has no replicated properties - and as of a few versions ago all the RPC's are routed through the owning character to save on component RPC overhead

#

Because apparently ACharacter and CMC weren't already monolithic enough

wary path Jul 15, 2019, 12:49 PM

#

ok

grand kestrel Jul 15, 2019, 1:01 PM

#

@chrome bay Its almost impressive they managed to make something that monolithic (great word for it :D)

#

I wouldn't have been able to proceed past a point with that massive cobweb

chrome bay Jul 15, 2019, 1:04 PM

#

I think it's the wrong word but nevermind 😄

#

But yeah... they're so entwined with each other now it's crazy

#

I want to know just how much overhead it really saves sending all those RPC's to the character actor instead

narrow prairie Jul 15, 2019, 1:17 PM

#

is there anyone out the who can help answer a question regarding rpc's

#

im trying to open a door trough a condition that the client has to have the key

#

atm im using run on server as input event

#

so the pickup is actually beeing done by the server

#

then i use a run on owning client to do the actuall pickup

#

this works fine , no erros and correct replies etc

#

how do i make it so after i removed the item trough the owning client event

#

it only works on server in the owning client event

#

its prolly something with authority, ive tried a couple of things

#

it only removes the item on the run on server event in the pickup actor

#

when i do the same thing

#

but change the flow from owning client

#

towards the run on server event

#

though i can never check it has actually beeing removed :S

#

so it removes regardless if im full or not

#

it looks like the client never does the remove function that is beeing called inside the owning client event

#

anyone ?

grand kestrel Jul 15, 2019, 1:22 PM

#

@chrome bay It actually tells you specifically, let me find it

#

@chrome bay The overhead for component replication is relatively low. Each component within an Actor that replicates will add an additional NetGUID (4 bytes) 'header' and an approximately 1 byte 'footer' along with its properties. CPU wise, there should be minimal difference between replicating a property on an Actor vs replicating on a component.

#

So each RPC sends the equivalent of an additional uint32 and uint8 🤔

#

That's pretty expensive 😄

#

(Given the frequency)

#

Just realizing how badly I messed up making my weapons actor components 🤦

chrome bay Jul 15, 2019, 1:25 PM

#

Ah screw it.. my weapons are actors made up of components 😄

narrow prairie Jul 15, 2019, 1:35 PM

#

so to ask my question better, how to perform a run on server event after a owning client event

crude sparrow Jul 15, 2019, 1:48 PM

#

Hi everyone, I am creating a polaroid but the frame of the photo comes black on the client... When I grab it on the server suddenly the client is the same as the server (both white) but when I grab it from the client both become black any ideas why?

karmic briar Jul 15, 2019, 2:15 PM

#

Hi anyone here have experience using the replication graph

#

I have some questions regarding it?

chrome bay Jul 15, 2019, 2:22 PM

#

a fair bit

narrow prairie Jul 15, 2019, 3:25 PM

#

i think i finally figured out what was wrong

#

allthough i dont get it

#

lol

#

moved some of the code over to player controller and it works now

pallid mesa Jul 15, 2019, 4:02 PM

#

``` good software design practices won't help you in performance

#

as I say always... universal solutions will make you sweat a lot and will perform worse than a monolithic solution

#

however a monolithic solution just sucks design wise

meager spade Jul 15, 2019, 4:30 PM

#

i kinda did my weapon like this

#

http://www.interkaos.com/grabs/devenv_h8j8bqcX4i.png

velvet parcel Jul 15, 2019, 4:51 PM

#

Anyone know the easiest way for me to determine who is client zero with either the player controller or playerstate?

meager spade Jul 15, 2019, 4:51 PM

#

client 0?

#

client 0 is different on every client

#

you need to explain what you are trying to do

#

might be a better approach

velvet parcel Jul 15, 2019, 4:52 PM

#

The server basically but where it wont mess up if its standalone

#

I just need to set some bools to true on begin play in the playerstate if you are player 1

#

This should work but for some weird reason its not

📎 2019-07-15_12-53-37.png

limber mortar Jul 15, 2019, 4:54 PM

#

@hollow nexus Thanks, I had a problem earlier in development where I was told here if the main actor replicates the components don't need to. I had a fire spreading through my map and the fire actor broke all my character actions as the game progressed. It was a few months ago, but setting only the main component to replicate fixed my problems at the time. Are you saying that the particle effect subcomponent should be replicated?

📎 unknown.png

velvet parcel Jul 15, 2019, 4:56 PM

#

I think I just figured out my problem

#

bah for some reason it didn't work. I need these permissions to be true no matter what for the server or player one.

📎 Revulsion2_2019-07-15_12-57-42.png

limber mortar Jul 15, 2019, 5:44 PM

#

I ask because I fear I have some replication issue in my game causing vehicles to have different locations on the server/client like so and don't want to do a bunch of useless stuff troubleshooting
https://youtu.be/ElbqVc93g0I

YouTube

Benjamin Beard

VehicleIssue

Issue during testing

▶ Play video

high current Jul 15, 2019, 6:02 PM

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In fear of stating the obvious @limber mortar it seems like data from client to server is being lost, or never transferred, can you try pushing the vehicle with like a physics ball, or something from the environment to impact the vehicle at begin play, without you giving it input, so you can see if the way you are feeding player input is the culprit

limber mortar Jul 15, 2019, 6:06 PM

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That is a great idea, and I am just finishing my first year of dev/game. So nothing is probably obvious, all self taught

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I will try that

twin juniper Jul 15, 2019, 6:07 PM

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Hey guys do you think this is good to make to all 8 player a ref in an multiplayer ?

📎 ServerTest.PNG

limber mortar Jul 15, 2019, 6:10 PM

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I want to test it 4 minutes in, because the repositioning gets worse as time goes on within the game so I'll create one from the level BP with a delay

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the other stinky thing is, the problem doesn't occur in PIE, so I have to upload to my sever to test 😄

high current Jul 15, 2019, 6:16 PM

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@limber mortar standalone helps, but yeah its best to test on your server

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@twin juniper where is that, in which blueprint

limber mortar Jul 15, 2019, 6:18 PM

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luckily I took the grass out for my alpha testers and it reduced the size of my game from 1.1 GB to 700, 😉 so my upload time was cut in half

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almost, but when I test in standalone, my game doesn't work in PIE like it does my dedicated server. For example, the vehicles don't even possess

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They do possess in game running off my azure server and in PIE

twin juniper Jul 15, 2019, 6:21 PM

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@high current gamemode

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Hi does someone know how to spawn for every player there own widget cauz currently the UMG are overlapping on every clients

high current Jul 15, 2019, 6:27 PM

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Then you are kinda fine, as the GameMode only exists on the server, and no client has access to it

meager spade Jul 15, 2019, 6:31 PM

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@twin juniper whoa why do that

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that is not needed

twin juniper Jul 15, 2019, 6:32 PM

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?

meager spade Jul 15, 2019, 6:32 PM

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gamestate has an array of all playerstates

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you really should be iterating them

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when needed

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not creating pointers to each player

twin juniper Jul 15, 2019, 6:34 PM

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and how can i call events on every client with gamestate ?

high current Jul 15, 2019, 6:34 PM

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Wait, are you storing the PlayerStates in that screenshot or something else

twin juniper Jul 15, 2019, 6:35 PM

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i am storeing the players in game mode so i can call on every client the event what not works

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because the server can only find with get all actor 1 player !

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even when 4 are on the map

meager spade Jul 15, 2019, 6:40 PM

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the something is wrong

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i have never ever have to store all 8 players in our co-op game

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to access them

twin juniper Jul 15, 2019, 6:46 PM

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it is a multiplayer game

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@meager spade how can then call event on every client from the game mode ?

high current Jul 15, 2019, 6:48 PM

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what do you want to do on that client, access the character or something else?

sharp pagoda Jul 15, 2019, 6:50 PM

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@twin juniper example:

📎 unknown.png

twin juniper Jul 15, 2019, 6:50 PM

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i only use bp sry but thanks 😄

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The thing is i want to change a bool in from the player from the gamemode !

fossil sentinel Jul 15, 2019, 6:52 PM

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Hey guys anyone know a good multiplayer spectator tutorial? They can link me to?

high current Jul 15, 2019, 6:53 PM

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@twin juniper ok so then its best to use the GameState, your game state exists both on server and client

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and its best if your GameMode calls the game state, to do that something you want to do, as mentioned, the game state already has the player state arrays

twin juniper Jul 15, 2019, 6:55 PM

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i know that i all ready had the array with the players but i cant call a event with for each loop

high current Jul 15, 2019, 6:56 PM

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is that event situated in the player character of each client?

pallid mesa Jul 15, 2019, 6:57 PM

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@meager spade I know that approach hehe

twin juniper Jul 15, 2019, 6:59 PM

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@high current jup

high current Jul 15, 2019, 7:03 PM

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try this

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📎 55068-bezC2A0tytuC582u.png

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get the character of each client, by the index in the player state array

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wait, I am stupid, there is a high possibility that this wont work

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@twin juniper do you need to exclude any specific client when you want to run your event, or are you doing it for all connected clients

lean ocean Jul 15, 2019, 7:36 PM

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Hey, I am trying to rotate a Sun Direction object around my scene, but when I try to use a boolean to start its rotation, the boolean is not replicated even if I set it to replicate. I use the gamemode to switch the boolean on or off. Rn, only my server starts to turn the light. I can't find the replication option for that blueprint, which I suppose are not exposed in to the blueprint side. I tried using RPCs, but they do not seem to be able to switch the boolean. Should I try to create my own class for this? Should I try moving the boolean control to the gamemode instead of the gamestate?

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Nevermind, the light is not replicated. How would you guys rotate a light dynamically?

limber mortar Jul 15, 2019, 7:47 PM

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I'm super curious to see if my test in 10 minutes on the server moves my vehicles 😄

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the impulse 4 minutes in

high current Jul 15, 2019, 7:55 PM

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@lean ocean the game mode only exists on the server, so your clients don't event have that actor, let alone any Boolean you set in it

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use the GameMode to instruct the GameState to switch your thing

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as the GameState exists both on server and client

lean ocean Jul 15, 2019, 7:56 PM

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@high current ok thanks. That is what I am doing atm, but it seems that directional lights are not replicated

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I think I might need to switch to a spot light

high current Jul 15, 2019, 7:56 PM

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you dont need to replicate the actor itself, if you are executing the same action which drives the actor on both client and server

lean ocean Jul 15, 2019, 7:56 PM

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that one has exposed replication settings

high current Jul 15, 2019, 7:57 PM

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BUT your directional light does need to be either stationary or dynamic

lean ocean Jul 15, 2019, 7:57 PM

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ok, I will look into it. Thank you very much 😃

limber mortar Jul 15, 2019, 8:22 PM

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@high current When I applied a large upward impulse to my vehicle 4 minutes into the game it jumps too, and my character can still run and undertake normal actions, so I don't think its the game. I am going to look at my vehicle movement again. I'm new to multiplayer and UE4, and have had to receive help to resolve some vehicle issues, so there is a good chance my mistake is there.

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https://youtu.be/EBOdDmBAhZ4

YouTube

Benjamin Beard

IndependentImpulse

Testing Physics problems while walking

▶ Play video

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at one point I had that cube smacking into the dozer, but it wasn't doing enough, or it was hard for me to tell at least how jumpy it was

high current Jul 15, 2019, 8:26 PM

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ok so in that 4 minutes, was there any point where you interfered with the vehicle's default position

lean ocean Jul 15, 2019, 8:27 PM

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@high current Thank you so much for your help! I did not think to use a multicast RPC in my gamestate to activate the lights of the client!

high current Jul 15, 2019, 8:28 PM

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😃

thin stratus Jul 15, 2019, 8:28 PM

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@limber mortar Weren't you the one saying you can do Vehicle Multiplayer in BPs and that's all you need?

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:D

limber mortar Jul 15, 2019, 8:29 PM

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I'm unsure about the complete context

thin stratus Jul 15, 2019, 8:29 PM

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Lemme check

limber mortar Jul 15, 2019, 8:29 PM

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Getting my vehicles working has been my last obstacle for alpha testing

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I had a helicopter impulse issue which a physics pro helped me, a foliage clearing issue for my dozer

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But I use blueprints and have had my vehicles driving fine in multiple versions of my game

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I've just broke them at some point and don't know what I am doing 100%

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😃

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I also asked about replicating components like movement

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But you can make vehicles in BP right? Maybe I misunderstand the question or reference

thin stratus Jul 15, 2019, 8:33 PM

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Nvm, was someone else then. Either way what you are seeing is a normal problem.
Are you using the default Vehicle classes?

limber mortar Jul 15, 2019, 8:33 PM

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Believe so

high current Jul 15, 2019, 8:33 PM

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Depends on the vehicles but in most cases yes you can

limber mortar Jul 15, 2019, 8:33 PM

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from that GTA project

thin stratus Jul 15, 2019, 8:33 PM

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Well are you inheriting from a Vehicle class?

limber mortar Jul 15, 2019, 8:33 PM

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that download from 4.8 or 15

thin stratus Jul 15, 2019, 8:34 PM

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And are you using some sort of given Vehicle Movement Component?

limber mortar Jul 15, 2019, 8:34 PM

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Yes it has a vehicle movement component

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believe it is the wheeled pawn class

thin stratus Jul 15, 2019, 8:34 PM

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That's the one from UE4?

limber mortar Jul 15, 2019, 8:34 PM

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opening to confirm

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yes

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Wheeled vehicle parent class

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I do talk a lot though 😉 Who knows what I have said

thin stratus Jul 15, 2019, 8:37 PM

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Na I found the person who said it, don't worry

limber mortar Jul 15, 2019, 8:37 PM

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no MrTapa

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I did not touch or possess the vehicle

thin stratus Jul 15, 2019, 8:38 PM

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The lagging driving you should makes me believe the vehicles has zero prediction

limber mortar Jul 15, 2019, 8:38 PM

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most likely

thin stratus Jul 15, 2019, 8:38 PM

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You are constantly getting reset to what the Server has etc.

limber mortar Jul 15, 2019, 8:38 PM

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I didn't not attempt to build in any prediction

thin stratus Jul 15, 2019, 8:38 PM

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It does have some replication in C++, but I don't see any SavedMoves like the character has

limber mortar Jul 15, 2019, 8:38 PM

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wasn't in that youtube video 😄

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Googling details and info on implementing vehicle prediction

thin stratus Jul 15, 2019, 8:40 PM

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It really only looks like the basic state is replicated

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But nothing related to you giving input

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This is pretty complex tbh

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The CMC for the Character has a few thousand lines of code

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Even if you cut away the root motion stuff

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The rubber bending effect you see is most likely not solvable without a custom C++ Vehicle Component

limber mortar Jul 15, 2019, 8:41 PM

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I'm not afraid of that

thin stratus Jul 15, 2019, 8:42 PM

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Specially since the Vehicle is based on PhysX it might actually not be possible to use this base one

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Cause PhysX + Multiplayer = NOGO

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You can try to switch this to a CLient Auth Model

limber mortar Jul 15, 2019, 8:42 PM

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well, that would be a good hiccup for my game

thin stratus Jul 15, 2019, 8:42 PM

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So the Server has to do what the Client does I guess

limber mortar Jul 15, 2019, 8:42 PM

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I saw that in a google

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don't know details yet, but was looking into it

thin stratus Jul 15, 2019, 8:43 PM

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Yeah so he more I read into it: Epic always had Vehicles client authoritive

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So there is no Client Prediction for Vehicles

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So as soon as you set it up ion a way that the Server can override the client possition, you run into lags

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You need to make sure that only the state is synced

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Try to not have the Vehicle set to ReplicatedMovement

high current Jul 15, 2019, 8:44 PM

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at risk of stating the obv (again) if you didnt touch the vehicle before hand then as eXi is suggesting its a matter of the initial replication settings configured wrong, might be lack of prediction might be lack of replicated movement

thin stratus Jul 15, 2019, 8:44 PM

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Cause the State of the MovementComponent should drive the car the same way

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If at all you can send the Location from Client to Server and then multicast to everyone (simulated only though, cause Server and local client already have the location at that point)

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But keep in mind that this does no smoothing for you

high current Jul 15, 2019, 8:45 PM

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or lack of variables pushed, in the video you showed us, how are you pushinf the car up, I am assuming an impulse, but can you share a screenshot on how you are setting that impulse

thin stratus Jul 15, 2019, 8:45 PM

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So if there is package loss, you car will teleport

limber mortar Jul 15, 2019, 8:45 PM

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good to know

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I pushed it up from the level blueprint to ensure it wasn't from some client action

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Add impulse

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Z 9 mil or so

high current Jul 15, 2019, 8:46 PM

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but was that event replicated

thin stratus Jul 15, 2019, 8:46 PM

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Man so weird to scroll through random a** UE4 forum threads and see people talking about you

limber mortar Jul 15, 2019, 8:46 PM

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I thought pawn movement was replicated to the server by default

thin stratus Jul 15, 2019, 8:46 PM

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Character Movement is

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Pawn Movement is also if you tick it

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But it's not more than Actor Movement replication

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Send Transform -> Apply Transform

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No prediction, no smoothing

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Only the CMC has that properly implemented

limber mortar Jul 15, 2019, 8:47 PM

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Random forum thread about me? Fabulous, never even used the forum part I believe, lol

thin stratus Jul 15, 2019, 8:47 PM

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No about me :D

limber mortar Jul 15, 2019, 8:47 PM

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oh

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lmao

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makes a lot more sense

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also going to look for an article on physx and multiplayer so I can understand

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the problems

thin stratus Jul 15, 2019, 8:49 PM

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I can explain it to you pretty quickly:

If you do Client Prediction you usually save the Move the player performed (so what direction, how fast, did they jump, etc.)

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In physX you'd need to save the whol PhysX scene, which is basically impossible

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Further in Client Prediction, if a Server, after some time, sends the updated location back, the Client throws away all the saved moves that are outdated, applies the new location and plays the newer moves again

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That is to make sure that the client doesn't get reset back to the way later incoming update

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Cause well, ping

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It takes x ms for the move input to reach the server, and x ms to get back to the client. I nthat time the client already moved further again and the client prediction makes sure it won't reset him back

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And this replaying etc. is all kinda impossible with Physics

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Cause for one you can't easily save the whole physix scene

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And then physics aren't deterministic either

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So if you perform the exact thing twice, it could happen differently

limber mortar Jul 15, 2019, 8:51 PM

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I get you

high current Jul 15, 2019, 8:52 PM

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because of floating point precision errors afaik

limber mortar Jul 15, 2019, 8:52 PM

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I got more work to do than I realized to get my vehicles working

thin stratus Jul 15, 2019, 8:52 PM

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So you really really really don't want to have Vehicles or Pawns using actual Physics if you need them to be Server Authoritive

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That is if you move the actor as a client

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A cube flying around can be Server Authority of course

limber mortar Jul 15, 2019, 8:52 PM

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Ok, my other in game actions work, hopefully I can knock this out and start alpha testing without big bug fixes

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yes, I understand

thin stratus Jul 15, 2019, 8:53 PM

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The best is to just do Client Authoritve movement

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It would mean that they can cheat though

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But you could more or less fight that if you double check that the vehicle didn't move too far in one frame

limber mortar Jul 15, 2019, 8:53 PM

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Its a cooperative, free to play and not too competitive game

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I'm not too concerned about that