#multiplayer | Unreal Source | Page 546

grizzled stirrup May 31, 2020, 6:18 PM

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Right

meager spade May 31, 2020, 6:18 PM

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but that is ok (i mean shooter game does it)

grizzled stirrup May 31, 2020, 6:19 PM

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So why would an explosion warrent RPCs to all clients when it has a short lifetime and can easily be set to false if not being destroyed?

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I believe shootergame uses a bool for FX too on projectiles but I can't remember

meager spade May 31, 2020, 6:19 PM

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dunno

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but i think of OnRep's as states, Multicast as one off things

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Explosion is a one off thing that happens, it being exploded is a state

grizzled stirrup May 31, 2020, 6:20 PM

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That indeed makes sense

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But I believe the cost of a multicast RPC is greater than an onrep bool

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In terms of bandwidth

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Looking for sources now

meager spade May 31, 2020, 6:20 PM

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i mean

grizzled stirrup May 31, 2020, 6:20 PM

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But if you had say 50 explosions going off at once

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That's potentially 100s of RPCs

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At once

meager spade May 31, 2020, 6:20 PM

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and?

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i actually don't multicast explosions

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nor onrep

grizzled stirrup May 31, 2020, 6:21 PM

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Ooo how

meager spade May 31, 2020, 6:21 PM

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its all done client side

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Projectile is spawned, and shot

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then the projectile is destroyed (server side), the clients call destroy

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which plays the effects locally

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i don't pool them tho

grizzled stirrup May 31, 2020, 6:22 PM

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Makes sense, nice solution

meager spade May 31, 2020, 6:23 PM

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and they are dirt cheap to instantiate

grizzled stirrup May 31, 2020, 6:23 PM

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Yeah I don't either

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I only pool enemies

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As they have a lot of components

meager spade May 31, 2020, 6:23 PM

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Pawns are expensive

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and characters

grizzled stirrup May 31, 2020, 6:23 PM

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and I feel that would be expensive to constantly destroy and spawn

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Yeah

meager spade May 31, 2020, 6:23 PM

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but a projectile is cheap

grizzled stirrup May 31, 2020, 6:25 PM

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Yeah looking at shootergame they use bExploded

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There's definitely a reason though I swear I read that Multicast RPCs are several times more expensive than just replicating a bool

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And especially for cosmetic stuff they'd be more efficient

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Well looking at recent discussions here on Discord it seems it doesn't really matter and yes you should prioritize state for OnRep and Multicast for one shots

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I just wonder if there's a comparison on the cost if that OnRep bool bExploded does essentially exactly the same visual thing as a multicast RPC to all clients

winged badger May 31, 2020, 6:34 PM

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it does, also when you enter net relevant range

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explosives long gone go boom, looted chests play opening animations, dead enemies rise so you can watch them die

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to avoid a multicast you need a timestamp and network synced clock, ontop of that boolean

hoary lark May 31, 2020, 6:36 PM

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not really important to topic but FWIW last time I measured it for myself, creating a projectile actor cost around 500 microseconds to spawn, 200 to destroy... pooling it reduced it to something like 60 microseconds to spawn and 50 to destroy

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relevant if you have MG42s in your game or something 😄

unreal pine May 31, 2020, 6:42 PM

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When I call GetGameState on my PlayerState, it returns invalid. Am I doing it wrong?

meager spade May 31, 2020, 6:45 PM

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you calling it to early?

unreal pine May 31, 2020, 6:46 PM

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I'm calling it after the player is added to the game

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to store their avatar in the game state

meager spade May 31, 2020, 6:46 PM

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server side or client side

unreal pine May 31, 2020, 6:46 PM

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Client

meager spade May 31, 2020, 6:46 PM

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too early

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if its null, then GameState might not have replicated

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by the time you access it

unreal pine May 31, 2020, 6:50 PM

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hoo boy it was a wombo-combo - it was too soon AND it looks like map variables don't replicate

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so I'll probably have to make it a custom struct

grizzled stirrup May 31, 2020, 7:05 PM

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@winged badger so you'd recommend Multicast for any kind of oneshot events?

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Just going off ShooterGame / UT for the examples which I know are getting long at the tooth

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But I'm sure there is a reason they chose to use OnRep instead of Multicast in those situations

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But maybe my perception of the cost of an RPC vs replicating properties is not as much as I thought

winged badger May 31, 2020, 8:08 PM

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multicasts have their purpose

grizzled stirrup May 31, 2020, 8:11 PM

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so in the case of a simple example, a gunshot muzzle flash and fire sound

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I should rewrite the onrep int that increments per shot and instead use a multicast RPC for each shot?

lunar root May 31, 2020, 9:04 PM

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(
    APlayerState * PlayerState
)``` Where does it have to be implemented? in the Old or in the New State ?

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@winged badger

grizzled stirrup May 31, 2020, 9:06 PM

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It is called in the old PS and the new PS is passed in

lunar root May 31, 2020, 9:06 PM

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Ty 🙂 Zlo mentioned it yesterday and i need it now 😛

grizzled stirrup May 31, 2020, 9:06 PM

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it's very very useful!

lunar root May 31, 2020, 9:07 PM

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Do i have to call the Super?

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i think so

winged badger May 31, 2020, 9:07 PM

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i have it on both

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as well as a common base for both

grizzled stirrup May 31, 2020, 9:07 PM

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void AMyPS::CopyProperties(APlayerState* PlayerState)
{
    Super::CopyProperties(PlayerState);

    AMyPS* PS = Cast<AMyPS>(PlayerState);
    if (PS)
    {
        PS->PlayerLevel = PlayerLevel;
        PS->EquippedSkin = EquippedSkin;
    }
}

winged badger May 31, 2020, 9:07 PM

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if client knows its firing

grizzled stirrup May 31, 2020, 9:07 PM

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That's how I use it

winged badger May 31, 2020, 9:07 PM

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it can figure out how to do a flash and sound on its own

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no point in multicasting or replicating anything then

grizzled stirrup May 31, 2020, 9:08 PM

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well client doesn't know that player B is firing

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Without some indication

winged badger May 31, 2020, 9:08 PM

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and you replicate the gameplay critical information

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and infer the effects from there

grizzled stirrup May 31, 2020, 9:09 PM

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Right so to replicate that critical information (say with an on rep int being incremented for each shot or an unreliable multicast that doesn't pass anything but just says "hey im firing") what would you choose?

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An on rep int "feels" more lightweight but I have noticed it's bad for fast firing weapons when you don't have a high enough net update rate

winged badger May 31, 2020, 9:09 PM

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depending on the type of the game

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i replicate firing key down, attack target, firing mode, and where PC weapon trace is

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let the clients figure out everything else themselves

grizzled stirrup May 31, 2020, 9:10 PM

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Right that makes sense

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In my game it's a bit more important that they know exactly where the bullet landed

winged badger May 31, 2020, 9:10 PM

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and i don't care if one client sees a mis other a hit

grizzled stirrup May 31, 2020, 9:10 PM

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And how many shots were fired

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Yeah in that case you can be lenient

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So you use onrep for those events right?

winged badger May 31, 2020, 9:11 PM

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i don't, full simulation

grizzled stirrup May 31, 2020, 9:11 PM

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Fire key down etc.

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how does that info get across the net

winged badger May 31, 2020, 9:11 PM

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those are onreps

grizzled stirrup May 31, 2020, 9:11 PM

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yeah

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I'm doing a similar thing but at the per shot level without multicasts

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Considering moving that to use multicast instead

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Since you'd guarantee every shot makes it through for the cosmetic side of things

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But so far haven't needed to use Multicast at all in the game so I'm wary of rewriting things

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while you said that OnRep has an overhead earlier, surely it is still less bandwidth than an RPC?

winged badger May 31, 2020, 9:14 PM

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its not

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its that without timing

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effects can get ducked if relevancy changes

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OnREps don't come with a timestamp you can access

grizzled stirrup May 31, 2020, 9:15 PM

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but say you don't need timestamps, say for a bullet impact

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I'm using an FVector_NetQuantize on rep as opposed to a fresh Multicast RPC with that vector sent

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And it works great

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the other players will see the current impact of the weapon at that location when it reps

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Sure they might miss a few if it's a really fast firing weapon

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It just feels nicer to know that there aren't constant RPCs going off and instead a nice single updating thing that will play FX if it has changed

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That said if I move to Multicasts for each impact then you can see absolutely every shot and there wouldn't be timing issues

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However I wonder if that comes with a greater cost or if I can just go ahead and not worry about it

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Possibly the reason they don't use Multicasts in ShooterGame and UT is just because Multicasts weren't used as much as a new feature back then

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I'll look in to simulating too with just a simple bIsFiring OnRep bool and have clients sim absolutely everything

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The only issue I see with that is that most of my weapons are semi auto

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So clients can click very fast and fire multiple shots

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But other clients would only see one shot

stoic acorn May 31, 2020, 9:24 PM

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how do you get the owner of a specific player? I'm trying to target someone other than the server

📎 unknown.png

stoic acorn May 31, 2020, 10:32 PM

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I can't find any documentation on the Replication Condition dropdown

📎 unknown.png

grizzled stirrup May 31, 2020, 10:41 PM

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Most are fairly self explanatory

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None means it will replicate to all

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Skip Owner means it will replicate to all but the player that owns the actor

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etc.

stoic acorn May 31, 2020, 10:52 PM

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I was hoping there would be examples of each use.

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I'm having some problems with My inventory system at the moment. Everything that ANY player picks up seems to go to the Server inventory.

meager spade May 31, 2020, 10:53 PM

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well you need to replicate that inventory

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from server to the client

stoic acorn May 31, 2020, 10:53 PM

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I'm storing the inventories in playerstate

meager spade May 31, 2020, 10:54 PM

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ok

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each player state is unique to each player

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you just need to make sure its replicated to owner

stoic acorn May 31, 2020, 10:54 PM

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that's what I thought, and it seemed logical for me to store the inventory there

meager spade May 31, 2020, 10:54 PM

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or none (will replicate to everyone)

stoic acorn May 31, 2020, 10:54 PM

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ah.. that's the bit I'm not getting.. how to replicate to owner?

meager spade May 31, 2020, 10:54 PM

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Owner Only..

stoic acorn May 31, 2020, 10:57 PM

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I'm storing it like this in the PlayerState

📎 unknown.png

meager spade May 31, 2020, 10:58 PM

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looks confusing lol

stoic acorn May 31, 2020, 10:58 PM

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haha well I couldn't think of a more elegant way to check for each type of treasure

meager spade May 31, 2020, 10:59 PM

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yeah i would not have done it like that

stoic acorn May 31, 2020, 10:59 PM

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This is inside the Determine Treasure Picked up

📎 unknown.png

meager spade May 31, 2020, 10:59 PM

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i assume you pickup treasure and it randomly gives you one item?

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yuck

stoic acorn May 31, 2020, 10:59 PM

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ah no.. so you can pickup many different types of treasure

meager spade May 31, 2020, 11:00 PM

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but why do they need to be stored in seperate arrays?

stoic acorn May 31, 2020, 11:00 PM

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I just did it that way so I have it all separated out

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Do I not need to do that?

meager spade May 31, 2020, 11:00 PM

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yeah but its also more headache to maintain

stoic acorn May 31, 2020, 11:01 PM

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what I want to do is display how much of each treasure a player has picked up

meager spade May 31, 2020, 11:01 PM

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you can do that with one array

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quite easily

stoic acorn May 31, 2020, 11:01 PM

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and also the sum total of the treasure value

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ah, that would be better if I could do it in one array and be able to filter it later when displaying on each player's hud

meager spade May 31, 2020, 11:01 PM

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that's the idea

stoic acorn May 31, 2020, 11:02 PM

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but that's not my problem right now. This clunky system works for now

meager spade May 31, 2020, 11:02 PM

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you have a Enum

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yes but to fix it

stoic acorn May 31, 2020, 11:02 PM

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ooh.. Enum

meager spade May 31, 2020, 11:02 PM

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your better to clean it

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then you have less to "fix"

stoic acorn May 31, 2020, 11:02 PM

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good point

meager spade May 31, 2020, 11:02 PM

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i mean i don't fully understand your system

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or what your game is about

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what is "treasure"

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just a normal actor

stoic acorn May 31, 2020, 11:03 PM

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yes

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well

meager spade May 31, 2020, 11:03 PM

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you don't have a Treasure_BP

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?

stoic acorn May 31, 2020, 11:03 PM

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children of a main Treasure Master class

meager spade May 31, 2020, 11:03 PM

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right

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so it can hold a enum

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for the type of treasure it is right

stoic acorn May 31, 2020, 11:04 PM

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hmm. I'm not familiar with enums

meager spade May 31, 2020, 11:04 PM

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here let me show you

stoic acorn May 31, 2020, 11:04 PM

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so you reckon that would be a better system?

meager spade May 31, 2020, 11:09 PM

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hmm

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i don't get https://www.thegames.dev/snaps/Discord_Je8KfUIkh5.png

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https://www.thegames.dev/snaps/Discord_n98LJ96HbE.png

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and this

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what is unique treasure count?

stoic acorn May 31, 2020, 11:11 PM

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Ah, unique treasure count gives me how many different unique types of treasure I have in my map. At the moment I have 5 different types (1p, 2p, 5p, 10p, 100p)

meager spade May 31, 2020, 11:11 PM

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right but the player walks up to the treasure right

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and collects it?

stoic acorn May 31, 2020, 11:12 PM

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yeah. and when the treasure overlaps with the player collision it stores the treasure then destroys it

meager spade May 31, 2020, 11:12 PM

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so your system is kinda weird

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for such case

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you know what treasure you overlapped

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and what type it was

stoic acorn May 31, 2020, 11:12 PM

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yeah

meager spade May 31, 2020, 11:12 PM

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so why all that stuff above?

stoic acorn May 31, 2020, 11:13 PM

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the unique treasure name

meager spade May 31, 2020, 11:13 PM

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player should get the treasure he overlapped with

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and that treasure knows its value

stoic acorn May 31, 2020, 11:14 PM

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that's all because I have different arrays for each treasure type (which you've just informed me that I don't need)

meager spade May 31, 2020, 11:14 PM

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right

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so

stoic acorn May 31, 2020, 11:15 PM

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so we can get rid of all of that

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the treasure tag was to allow me to quickly find which treasure was being overlapped

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I'm a noob at this and was fully aware that as I was making this spaghetti code that there was probably a far more elegant way of doing it

meager spade May 31, 2020, 11:17 PM

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in c++ this would have been a lot cleaner 😄

stoic acorn May 31, 2020, 11:17 PM

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I just need to be able to pickup different types of treasure (that each have a value attached) and for the server to store it all for each individual player.

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haha most likely but I'm an artist who doesn't know c++ from his elbow

meager spade May 31, 2020, 11:18 PM

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oops

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hold on

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https://www.thegames.dev/snaps/UE4Editor_CMOyKOYpqM.png

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so this will increment your existing items everytime the same item is added, or will make a new entry for a new type of pickup

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your overlap just calls StoreItem and passes in the treasures type enum

stoic acorn May 31, 2020, 11:20 PM

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.. and this is on the PlayerState?

meager spade May 31, 2020, 11:21 PM

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yes

stoic acorn May 31, 2020, 11:21 PM

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ok, let me rebuild this and absorb what you just did

meager spade May 31, 2020, 11:21 PM

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https://www.thegames.dev/snaps/UE4Editor_2RCTHkd6om.png

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https://www.thegames.dev/snaps/UE4Editor_7On5owtHaV.png

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https://www.thegames.dev/snaps/UE4Editor_rFYtOso5sw.png

stoic acorn May 31, 2020, 11:21 PM

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is PlayerCollecteTreasure a struct or something?

meager spade May 31, 2020, 11:21 PM

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kinda thing

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yes

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you can't replicate a Map

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else that would have been even easier

stoic acorn May 31, 2020, 11:22 PM

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ok.. so you just did in 10 mins what has taken me many many nights of head banging on desk to get wrong 😄

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maybe I should just stick to artwork

meager spade May 31, 2020, 11:23 PM

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well like i said i am not sure of your game or your setup

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but this is the way i would approach it

stoic acorn May 31, 2020, 11:23 PM

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I have confidence in my game design. I just have no idea how to implement it

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this is going to be a marathon

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thank you very much for the pointer though.

lunar root May 31, 2020, 11:29 PM

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For some reason I cannot move after ServerTravel (seamless) any ideas?

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The Target GM works fine when launching directly into it however I'm stuck in the air when traveling to it

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The Target GM is an empty class which inherits from AGameMode, I commented everything out so it's literally empty

stoic acorn May 31, 2020, 11:49 PM

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@meager spade sorry to bother you again, what variable type is Player Treasure?

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nevermind, the clue was in the picture. PlayerCollected struct

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though I can't get mine to look like yours

📎 unknown.png

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aha

📎 unknown.png

lunar root Jun 1, 2020, 12:26 AM

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Addition: I tested now a lot and i have not a single clue how to solve this usse

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I dont even have an outliner since i cnat test traveling in PIE only in Standalone..

nova ermine Jun 1, 2020, 1:22 AM

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Can someone help me with replicating this crouching mechanic?

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When I change the capsule half height to a crouching position Im also trying to change the Z axis of the character mesh so that he doesn't clip into the ground

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📎 Screenshot_211.png

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📎 Screenshot_212.png

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📎 Screenshot_213.png

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Aparently my blueprints are only working client side

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So you can see yourself crouching properly

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But other players clip into the ground

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📎 Screenshot_214.png

nova ermine Jun 1, 2020, 2:12 AM

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ok this is a huge bug

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I fixed it by disabling Network Smoothing in the Character Movement Component

lunar root Jun 1, 2020, 2:35 AM

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Works with non-seamless-travel but ofc all my data is gone

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when using seamless-travel I'm stuck and can't move

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OH MY F*** GOD, the Server crashed in the background and neither the debugger nor the editor told me about it ...

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= Cannot move

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I'm so done lol

swift kelp Jun 1, 2020, 5:11 AM

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I am following a tutorial and on one screen he has

📎 unknown.png

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and on the other...

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📎 unknown.png

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I can only figure out how to play as both clients or both servers, how do I do what he did?

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📎 unknown.png

hoary lark Jun 1, 2020, 5:36 AM

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I think there's a bug in the window names, the 2nd client will say it's server when it's not unreal

swift kelp Jun 1, 2020, 5:43 AM

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thanks for letting me know

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the pictures above were from ue4 v4.17

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(so the course is very old)

swift kelp Jun 1, 2020, 6:46 AM

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📎 unknown.png

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I thought I had a solution for the issue above, but don't.
Do any of you have a solution for this issue?

random nymph Jun 1, 2020, 7:26 AM

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Any way to use Steam OSS when testing in editor?

bitter oriole Jun 1, 2020, 7:27 AM

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No

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Righ click your uproject and hit launch, or debug from VS with -game

random nymph Jun 1, 2020, 7:28 AM

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Right clicking and launching doesn't work for me for some reason

bitter oriole Jun 1, 2020, 7:29 AM

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Time to fix it

random nymph Jun 1, 2020, 7:30 AM

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Does it need the steam_appid.txt file when using the launch?

bitter oriole Jun 1, 2020, 7:30 AM

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No

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That's only useful for Shipping packaged builds AFAIK

random nymph Jun 1, 2020, 7:31 AM

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Okay

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Well then I have no idea how to fix it

bitter oriole Jun 1, 2020, 7:32 AM

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Fix what

random nymph Jun 1, 2020, 7:33 AM

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Getting steam OSS working when right clicking uproject and selecting launch

bitter oriole Jun 1, 2020, 7:33 AM

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Does shift + tab show the Steam overlay

random nymph Jun 1, 2020, 7:34 AM

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No and I have a debug log that says it can't get the steam oss

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Packaged build works fine

bitter oriole Jun 1, 2020, 7:35 AM

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Works fine here, so I don't know what to suggest.

random nymph Jun 1, 2020, 7:41 AM

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Yeah

plain flume Jun 1, 2020, 8:28 AM

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Any ETA or info when Unreal Engine has Epic Online Services integration? It seems that only non-engine SDK is available now

bitter oriole Jun 1, 2020, 8:29 AM

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No ETA, try the communtiy plugin or wait for 4.26 to see if that brings it

plain flume Jun 1, 2020, 8:30 AM

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Oh. I missed the community one. Where would I find it?

bitter oriole Jun 1, 2020, 8:30 AM

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It's on the forums somewhere

plain flume Jun 1, 2020, 8:31 AM

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Thanks @bitter oriole

warped stream Jun 1, 2020, 10:23 AM

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I think there's a bug in the window names, the 2nd client will say it's server when it's not
@hoary lark Can Confirm

chrome bay Jun 1, 2020, 10:32 AM

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There's a fix for it on Git somewhere

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Hopefully that'll make it into 4.25.1...

shrewd tinsel Jun 1, 2020, 11:47 AM

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from which class should i manage player spawning for an online game?

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gamestate or gamemode

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and why?

bitter oriole Jun 1, 2020, 11:49 AM

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Game mode

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Because, well, that's what already handles player spawning

unkempt tiger Jun 1, 2020, 11:51 AM

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any way of passing raw serialized data in an RPC?

chrome bay Jun 1, 2020, 11:57 AM

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There's no easy way, but you can wrap a TSharedPtr<> to the data with a USTRUCT(), and create the data at each end

unkempt tiger Jun 1, 2020, 11:59 AM

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Oh, what do you mean create the data at each end?

chrome bay Jun 1, 2020, 11:59 AM

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Have a look at FGameplayEffectContextHandle

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Basically inherently there is no way to send arbitrary binary data via RPC

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But you can get around it by doing something like FGameplayEffectContextHandle, which is a wrapper struct that overrides NetSerialize() to create the data you need.

unkempt tiger Jun 1, 2020, 12:00 PM

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I'll look at FGameplayEffectContextHandle

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Thanks!

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btw

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What are your thoughts about just a TArray of uint8's?

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Oh, I guess thats not quite the same

chrome bay Jun 1, 2020, 12:03 PM

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I've done that before but it's not ideal

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And some things can't be sent that way, like object pointers etc.

median elbow Jun 1, 2020, 12:27 PM

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does anybody know of some documentation somewhere that will give some input on how to authenticate steam users for a dedicated server?

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it seems that player count and a lot of other things will not work for steam "GameServer"s unless users are authenticated, which is not done for you by the online subsystem steam like it is for the lobby sessions

winged badger Jun 1, 2020, 12:30 PM

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you should do the discord search here @median elbow that topic does occasionally pop up

grizzled stirrup Jun 1, 2020, 12:35 PM

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If you have small enough levels is it fine to mark all characters and other important items as Always Relevant? Is relevancy more important in games like Fortnite that have much larger maps with lots of things that shouldn't replicate at distance?

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To prevent potentially having to show or hide certain actors on the client depending on distance

median elbow Jun 1, 2020, 12:36 PM

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actually @winged badger its funny you just said that, i usually do that, and i actually did do that here too, i just wasn't sure exactly what to search for, although teh search has proven very useful in the past, i was planning on searching more but thought i'd just ask about it quick while i was doing some other things

winged badger Jun 1, 2020, 12:37 PM

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i think either vlad or cedric posted a full set of screens with BP example

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it was a while ago

median elbow Jun 1, 2020, 12:40 PM

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awesome, i'll check for that, thanks

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i'm not even 100% sure what to check for because if i make the search too specific i don't get anything, but if i do something like "steam dedicated server" i get a bunch of stuff thats just setting it up which i already have

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anyway i'll keep searching, but if anybody does happen to know of documentation about this off the top of their head, that would be helpful

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i do know that the dedicated server is a little more tricky, because the client is not connected to the server at the time the online subsystem would do the check

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so you have to basically have the client connect to the server, THEN if the authentication fails kick them

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but there's got to be another way, with beacons or something. i'd hate to have to write my own networking code just for this, it seems like something that plenty of people should already have come across and found an elegant solution for

winged badger Jun 1, 2020, 12:49 PM

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i'd go with something like "steam auth"

cosmic marlin Jun 1, 2020, 1:08 PM

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Hi everyone. I created a simple create and join session mechanism . it is working fine on one level . But doesn't work on another one. Game mode setting are same for both. but the map( where it doesn't work) is insanely huge. Please help. Thanks in advance

median elbow Jun 1, 2020, 1:20 PM

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you were right @winged badger , vlad and cedric were talking about it earlier

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i think i got all the information i really need. too bad ue doesn't already ahve something for this, so gotta do it manually, but it seems simple enough

thin stratus Jun 1, 2020, 3:04 PM

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Quick question regarding C++ and Steam includes: I'm including these two:

#include "steam/isteammatchmaking.h"
#include "steam/matchmakingtypes.h"

and I get an ARRAY_COUNT macro problem, cause it's redefined in there.
What was the proper way to include steam related things, like the two headers above?

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I could add this #define ARRAY_COUNT( array ) (sizeof(ArrayCountHelper(array)) - 1) after the includes, to get the standard behavior back.
But that doesn't remove the warnings.

floral crow Jun 1, 2020, 3:10 PM

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Having an issue where in normal network conditions and in 99% of cases all of my enemies get unpooled correctly with an OnRep bool but when I set the network emulation to "Bad" where there's 5% packet loss, some enemies never become unpooled and visible on the client even though on the server they are shooting projectiles
@grizzled stirrup how do you do this? I googled ue4 network simulation setting and got to this https://docs.unrealengine.com/en-US/API/Runtime/Engine/Engine/FPacketSimulationSettings/index.html and https://forums.unrealengine.com/unreal-engine/feedback-for-epic/89660-network-latency-simulation-settings-no-longer-work , but no explained tutorial or guide on which are the possibilities and rules to follow...

FPacketSimulationSettings

Holds the packet simulation settings in one place

Unreal Engine Forums

Tell us how to improve Unreal Engine 4!

grizzled stirrup Jun 1, 2020, 3:49 PM

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@floral crow It is new to 4.25 you can find it in Editor Preferences by searching "net"

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Very useful as before you had to enter different console commands for the same result

floral crow Jun 1, 2020, 3:56 PM

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Hmm My team won't update to 4.25 until late June as we are close to a deadline and Lead doesn't want to risk it. How can I achieve the Net simulation (even if it takes a lot of commands)

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I'm tasked to find a fix as many network related bugs/crashes and it's 1000 times more complicated if I've no proper way to repro bad conditions

kindred widget Jun 1, 2020, 3:57 PM

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It's only a risk if you don't back up the project.

grizzled stirrup Jun 1, 2020, 3:58 PM

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You can directly call the console commands which is all this feature is doing behind the scenes

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https://www.unrealengine.com/en-US/blog/finding-network-based-exploits

Unreal Engine

Finding Network Based Exploits

Recently, I had an email conversation with a Gears of War fan about the differences in networking quality between each of the three games in the series. One thing that we can point to in terms of increasing the quality of the networking experience is our use of the Unreal Engi...

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PktLag=0
PktLagVariance=0
PktLoss=0
PktOrder=0
PktDup=0

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if you type in the console net pktlag = 100

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You'll get 100 ms ping (can be called on just the server or just the client or both which would be 200ms ping effectively, make sure to debug the ping output to verify)

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Also for reference, packet loss is the thing that causes the most obvious issues in many cases, the "Average" network setting in 4.25 sets that to 1% and the "Bad" network setting in 4.25 sets it to 5%

floral crow Jun 1, 2020, 4:05 PM

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Cool. thanks @grizzled stirrup these cl commands will totally do it

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One more question: How can I send console commands to the server in a PIE session?

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Currenlty I only know how to send them to clients (easy as opening the console in their window) but Idk if it's possible to open a console for the server (as there's no dedicated server window)

📎 unknown.png

thin stratus Jun 1, 2020, 4:09 PM

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Strange. I get crashes when calling SteamAPI_Init() and similar in 4.22. in PIE. (I know Steam isn't supported in PIE, but it shouldn'T crash either).
Pretty sure I didn't have that issue before, but maybe I never used the SteamAPI on 4.22 and they fixed something later on.
blocking all of the code off with #if PLATFORM_WINDOWS && !WITH_EDITOR
Not sure if I'm missing something or if that was needed in 4.22

odd iron Jun 1, 2020, 4:23 PM

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Hi Guys The Dedicated server is not showing in steam server browser .. just showing in LAN tab how..
and 2nd thing the client says -->

[2020.05.31-17.48.55:309][ 85]LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = OutdatedClient, ErrorString = The match you are trying to join is running an incompatible version of the game.  Please try upgrading your game version., Driver = PendingNetDriver IpNetDriver_0
[2020.05.31-17.48.55:310][ 85]LogNet: Warning: Network Failure: PendingNetDriver[OutdatedClient]: The match you are trying to join is running an incompatible version of the game.  Please try upgrading your game version.

Please if someone can explain to me the issue and how to fix it thanks ❤️

grizzled stirrup Jun 1, 2020, 4:27 PM

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@floral crow You can do it in the level blueprint with the "Execute Console Command" node

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On event begin play

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That will run on both client and server

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There's probably a much nicer way using config files but this works for debugging

floral crow Jun 1, 2020, 4:35 PM

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I see. But there's no way to open a runtime console for the dedicated server?

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to improve or worsen net conditions arbitrarily at runtime? And send other useful commands as well...

fleet raven Jun 1, 2020, 4:37 PM

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you can always implement your own console window ✅

floral crow Jun 1, 2020, 4:40 PM

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https://forums.unrealengine.com/development-discussion/c-gameplay-programming/1427946-dedicated-server-and-console-commands-exec-cvars Is this still relevant? (Feb 2018)

A common method is to send the commands via the deferred command list.
Code:
GEngine->DeferredCommands.Add(TEXT("SomeCommand"));
Not sure what you mean by "RPC, you are already on the server?

If you want to execute a command from a client on the dedicated server you need to send an RPC with the command.

Unreal Engine Forums

Can a dedicated server execute console commands at runtime (CVars and Exec UFUNCTIONs)? If so, how simple is that?

Im asking this before setting up a

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you can always implement your own console window ✅
@fleet raven But I'd be missing on command autocompletion which is really helpful, mostly to discover new commands which are almost completely missing from the docs

fleet raven Jun 1, 2020, 4:42 PM

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could implement auto completion too

dawn summit Jun 1, 2020, 4:54 PM

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@meager spade it seems like MovementMode is replicated
not sure exaclty how but there are 2 things in CMC
bNetworkMovementModeChanged
GetReplicatedMovementMode()

fast mason Jun 1, 2020, 4:59 PM

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hey guys, I'm looking for some guidance..

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been reading around the network scheme, and what would you think is the correct approach for supporting over 1 thousand users in UE4 dedicated servers?
should I go with my own TCP Server, Level Streaming (multiple dedicated servers) or how?

rancid ledge Jun 1, 2020, 6:36 PM

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you can also use Agones

twin juniper Jun 1, 2020, 6:39 PM

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Can someone help me? i'm trying to get into multiplayer, but when I go to play and set my players to 2 and then press play I get the second viewport, but instead of it spawning another character, it is just a camera that I can fly around. How would I fix this?

meager spade Jun 1, 2020, 6:48 PM

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need to have your pawn set in the game mode

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and that game mode assigned to that level

twin juniper Jun 1, 2020, 7:04 PM

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https://streamable.com/ewqp88 I'm guessing I'm doing something wrong again. I'm trying to follow a tutorial and his characters dont really seem to be moving in unison. lol any idea what's going on here

Streamable

2020-06-01 14-01-50 - Streamable

▶ Play video

median elbow Jun 1, 2020, 7:32 PM

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In my player controller, the beginplay is running on both the owning client as well as the dedicated server. i know this is supposed to happen, but what kind of check can i do in blueprints to only run on the client in beginplay?

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i tried hasauthority but realized that will always be false for the client. I could check if its the dedicated server, but then when its a listen server then it will run

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is there like, "IsOwner" blueprint or something?

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i could have beginplay call an RPC that only runs on the owning client, and so far i think thats the best way i've found, but it seems like there'd be a blueprint or something i can just check without doing an RPC

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i could do this in c++ too if theres no blueprint for this

scarlet cypress Jun 1, 2020, 7:46 PM

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Does someone know this bug? There are two huds (from clien and server) being displayed on top of each other. (It is only a problem when there are multiple players in the game)

📎 Unbenannt.PNG

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The HUD events play local and dont get replicated.

weary mortar Jun 1, 2020, 7:57 PM

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My running animation is playing faster in clients than in server... I'm really getiing nuts with it... anybody has any idea why does it happen?

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I mean in autonomous proxies... because in listen server and in simulated proxies, it plays perfectly

scarlet cypress Jun 1, 2020, 8:00 PM

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maybe a speed variable that isnt replicated?

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or replicated falsly

weary mortar Jun 1, 2020, 8:02 PM

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I'm overriding the CMC to avoid server corrections... I checked that and it doesn't seem to be a problem, because maxwalkspeed looks fine.... but anyway I'll double check it, any other idea will also be appreciated

copper grove Jun 1, 2020, 8:23 PM

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anyone ever ran on a game on aws vpc's?

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im wondering if in essence, it works just like LAN

floral crow Jun 1, 2020, 9:07 PM

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Hey, I'm trying to write a notification system so that all in-game logic starts running only after GameMode considers that we're ready. I was thinking on a Multicast Delegate present on the GameState to be called by GameMode.

//MyGameState.h
DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnGameLoopStart);
...

UPROPERTY(BlueprintAssignable) FOnGameLoopStart OnGameLoopStart;
UFUNCTION(NetMulticast, Reliable) void Multicast_OnGameLoopStart();

What I don't like about this approach is that late-joining clients will never get the event call

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That made me think that maybe a replicated property bGameLoopHasStarted with an OnRep method would be better. That way the state GameLoopHasStarted can be accessed infinitely instead of being a one-off.
My question is: The first time the value is set on the client does it also call OnRep_GameLoopHasStarted so a player joining late will properly trigger the initialization?
What if I want the server to also get notified, can it be done without writing a setter in C++? I understand that in Blueprints RepNotify runs on server as well, but that's not true in C++.

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Any suggestions on how to implement this type of behavior?

swift kelp Jun 1, 2020, 11:04 PM

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📎 unknown.png

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back in UE 4.17 you could run client and server at the same time (watched a tutorial on this)
now it has changed where it looks like you can only run as one or the other.
Is there a way to do this like the old days?

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📎 unknown.png

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If you leave that option unchecked, it explains just what I said. (ue 4.17)

unkempt tiger Jun 1, 2020, 11:05 PM

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does sending a large amount of data through an RPC necessarily mean a proportionally large packet? or does the engine take the liberty of splitting up chunks and putting them back together on the other side etc

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Asking because in the real world large packets are more likely to get dropped in routing intersections

floral crow Jun 1, 2020, 11:50 PM

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back in UE 4.17 you could run client and server at the same time (watched a tutorial on this)
now it has changed where it looks like you can only run as one or the other.
Is there a way to do this like the old days?
@swift kelp Why do you need that? Does your game use a dedicated server or a listen-server

swift kelp Jun 1, 2020, 11:57 PM

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in the looman tutorial, he uses debug code (output only visible to the server due to server specific code) and normal client code. He shows the different action output on the two different screens. I can't follow along now (or at least no on some of his topics) if I can't run the editor the way it used to be able to be run.

cosmic trail Jun 2, 2020, 12:14 AM

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Anyone have links to good articles on understanding the network profiler tool? Trying to debug why things are so choppy with just a few units firing at each other

warm goblet Jun 2, 2020, 12:43 AM

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Noob question: I want to be able to play my game online (over the internet) with my co-workers across mobile (Android) and PC. We are currently using the Null session implementation which works over LAN PC to PC but I am struggling to get that working over the internet using something like Hamachi. I am about to go deep and debug that but I am wondering if there might be a simpler path. Can anyone advise?

So far going this route I am encountering issues such as the Null session impl relies on UDP broadcast traffic which I am not sure works on Hamachi. I also know that this feature isn't fully supported on every Android Wifi interface. I don't see a way to tell the Null impl to broadcast on a specific interface so I manually added a route forcing 255.255.255.255 over the Hamachi link, this will be a tricky workaround to scale to the team if it turns out to be a solution. I started looking at what it would take to just make my own session impl which I think I can do but that led to me to ask here if there is something that I can use already to do that.

I thought about steam for example but I don't think it works w/ Android. Also I don't think we want to sign our game up for steam yet and deal with any licesnsing implications there

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@cosmic trail what kind of choppyness are you seeing?

cosmic trail Jun 2, 2020, 12:47 AM

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@warm goblet movement choppiness, lots of jumping around when there are about 5 units + their projectiles on the screen. And really just using basic character movement...maybe it's debug build mode?...just seems odd, frame rate doesn't drop, mostly around 38-40fps

warm goblet Jun 2, 2020, 12:49 AM

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The network profiler will be good at showing you what kind of information you are sending over the network and how much

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The default setting that you have problably seen is that actors replicate at 100fps

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which in your case will mean every frame, sync every actor

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This can easily lead to a lot of data being sent even for simple stuff

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The docs recommend tuning that down to like 10fps for important actors and 2-5 fps for less important ones

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Also if you haven't checked "replicate movement" your actors will only get periodic location updates which can cause it to look choppy

cosmic trail Jun 2, 2020, 12:55 AM

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Hmm yeah. 6KB/sec is that a lot? I didn't think it was that much, not sure why it would start stuttering... it's as if it's skipping replication once the number of moving units being replicated goes to 5-6. It's fine with just a couple units on the screen and no projectiles..and the network profiling says that projectiles aren't really replicating as much as actor movement overall...And I turned priority high for the thing that was stuttering most, and it seemed to fix it..but I don't see why it should start cutting off replication with just 5-6 units updating movement. It should be like 100 units is what I expect before it starts throttling some...also this is on a local server...

warm goblet Jun 2, 2020, 1:04 AM

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I'm sure you are aware but replication channels (i.e. your connection w/ the server) have a target capacity

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And replication prioritizes messages so that you don't go over that capacity

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That capacity isn't the same as your link capacity (like its not going to be 100mbps or anything like that)

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I don't know how to configure it but that sounds like what is happening here

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replication messages are being dropped to maintain the channel capacity target

plush wave Jun 2, 2020, 1:08 AM

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📎 Capture.PNG

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^This will get Steam if I launch with it right?

cosmic marlin Jun 2, 2020, 2:32 AM

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Hi everyone. I created a simple create and join session mechanism . it is working fine on one level . But doesn't work on another one. Game mode setting are same for both. but the map( where it doesn't work) is insanely huge. Please help. Thanks in advance

swift kelp Jun 2, 2020, 2:40 AM

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📎 unknown.png

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any reason why I may be getting that error?

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C:\AID\UE4\UE_4.25\Engine\Binaries\Win64\UE4Editor.exe D:\APD\UE4\Lessons\GDTV\Multiplayer\PuzzlePlatforms\PuzzelPlatforms.uproject -server -log PORT=7777

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and

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C:\AID\UE4\UE_4.25\Engine\Binaries\Win64\UE4Editor.exe D:\APD\UE4\Lessons\GDTV\Multiplayer\PuzzlePlatforms\PuzzelPlatforms.uproject 0.0.0.0 -game -log PORT=7777

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see anything I am doing wrong?

barren patrol Jun 2, 2020, 2:47 AM

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is there a good way to implement an ACK on an unreliable RPC? should i just reply with another RPC?

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im trying to replicate an input buffer from client to server. but i dont want to use "reliable UDP" on every single input. instead i want to resend ALL unacknowledged contents of the buffer

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e.g. if my client sent inputs 1, send it to server, then queues up 2, 3. if my ACK comes back on 1 i will send 2,3. otherwise send 1,2,3 on next send frame

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alternatively i could have a replicated property for the "ACKed" frame in the input buffer (like a uint8 or something) and listen for rep notify on that

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i need to do this every tick (or at least every tick i have unsent inputs)

next fable Jun 2, 2020, 3:38 AM

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Hey guys... I have a HUD where I"m trying to display my multiple players state. However when I step through the Game State Player Array, my Pawn Private variable is "out of scope". This HUD update is being called from GameModeBase HandleStartingNewPlayer.

📎 unknown.png

warm goblet Jun 2, 2020, 4:39 AM

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@barren patrol Its common to include some information like that in a state object that is replicated back to the client

barren patrol Jun 2, 2020, 4:39 AM

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so, more like the second option? 🙂

warm goblet Jun 2, 2020, 4:40 AM

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Yea

barren patrol Jun 2, 2020, 4:40 AM

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cool, thanks!

warm goblet Jun 2, 2020, 4:40 AM

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One pattern I've done is save which move (input) caused the current state

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so when the new state comes down via replication, you can replay inputs that you have buffered on the client since the one that is come down on top of that state

fringe dove Jun 2, 2020, 6:24 AM

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I'm seeing actors with bOnlyRelevantToOwner get replicated to a demo replay (recorded on server, not client). Is that a bug? Shouldn't they not go into demo replays?

plush wave Jun 2, 2020, 6:57 AM

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Anyone know how to set NativePlatformService?

light monolith Jun 2, 2020, 9:12 AM

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Why is client 1 printing hello twice?

📎 Player.JPG

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📎 Capture.JPG

buoyant wedge Jun 2, 2020, 9:18 AM

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hello guys. Any one can explain this problem?

📎 unknown.png

#

📎 unknown.png

chrome bay Jun 2, 2020, 9:25 AM

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Tick is using the item before you created it

buoyant wedge Jun 2, 2020, 9:42 AM

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thx you

odd iron Jun 2, 2020, 11:20 AM

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@swift kelp I have same issue and server is not showing in steam server internet tab

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are you sure the port is forwarded in your pc ?

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in your router i mean

winged badger Jun 2, 2020, 11:34 AM

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from memory, server isn't visible to the machine thats hosting it

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steam API limitation, not sure they ever went around fixing that

chrome bay Jun 2, 2020, 11:35 AM

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yeah they never did 😦

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Have to use a separate machine or a VM

dawn summit Jun 2, 2020, 1:16 PM

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Greetings.
Noob question.
If i want to make user activated function RPC that needs to be run on client and server, do i need 4 methods to be added?

Action_MyFunc() //on key press
MyFunc() //call for Server_MyFunc_Implementation and MyFunc_Implementation
Server_MyFunc_Implementation() //server also calls for MyFunc_Implementation, not included validationm optional
MyFunc_Implementation() //actual stuff happens here```

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or i can skip the action one and run myFunc on key press?

shrewd tinsel Jun 2, 2020, 1:37 PM

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https://i.imgur.com/i6JNpJJ.png why this spawns only one client i dont get it

Imgur

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this is on gamemode

dawn summit Jun 2, 2020, 1:51 PM

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@shrewd tinsel how many you expect?

chrome bay Jun 2, 2020, 1:51 PM

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You can do it with two functions easily

dawn summit Jun 2, 2020, 1:51 PM

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@chrome bay me?

chrome bay Jun 2, 2020, 1:52 PM

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yeah

dawn summit Jun 2, 2020, 1:52 PM

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@chrome bay please tell 🙂

chrome bay Jun 2, 2020, 1:52 PM

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{
    if (!HasAuthority())
    {
        Server_DoSomething();
    }
    else
    {
        // Code
    }
}

void Server_DoSomething_Implementation()
{
    DoSomething();
}```

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No reason to call other functions

#

If you want the body to run server and client side just remove the else

dawn summit Jun 2, 2020, 1:53 PM

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where the part that runs on client and server?

chrome bay Jun 2, 2020, 1:53 PM

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If you want to run on both remove the else and put it there

#

Then it just becomes this:

{
    if (!HasAuthority())
    {
        Server_DoSomething();
    }

    // Code
}

void Server_DoSomething_Implementation()
{
    DoSomething();
}```

dawn summit Jun 2, 2020, 1:54 PM

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but...do something goes before server_

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then it just runs on client

chrome bay Jun 2, 2020, 1:55 PM

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It doesn't, because DoSomething() calls Server_DoSomething() if you're a client.

dawn summit Jun 2, 2020, 1:55 PM

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if you bind key to DoSomething it want be called on server

chrome bay Jun 2, 2020, 1:55 PM

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Yes it will

#

Because Server_DoSomething() is being called as part of it

dawn summit Jun 2, 2020, 1:55 PM

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but
// Code
wont be

chrome bay Jun 2, 2020, 1:55 PM

#

it will

dawn summit Jun 2, 2020, 1:56 PM

#

how so?

light monolith Jun 2, 2020, 1:56 PM

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Why is "Play sound at location" plays 3 times when i have 4 players in game? is there any fix to this? i tried spawning it only on the server but it plays only on the server

chrome bay Jun 2, 2020, 1:56 PM

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because Server_DoSomething_Implementation() is calling DoSomething()

dawn summit Jun 2, 2020, 1:56 PM

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@chrome bay oooh...
what happens on ListenServer? it will run twice??

#

// Code

chrome bay Jun 2, 2020, 1:56 PM

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No, because of !HasAuthority() check

dawn summit Jun 2, 2020, 1:57 PM

#

but
// Code
is not ELSE

chrome bay Jun 2, 2020, 1:58 PM

#

Think about it:
Client calls DoSomething()
Client calls Server_DoSomething()
Client runs // Code

Server receives Server_DoSomething(), calls DoSomething()
Server runs // Code

#

A listen server has authority because it's the Server, so it won't call Server_DoSomething();

#

If it did you'd end up in an infinite loop anyway

rose egret Jun 2, 2020, 2:00 PM

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for a server spawned replicating actor, GetObjectName() or GetPathName() may return different value for each client. am I right ?
so how do I print their unique name (NetGUI maybe) in BP ?

chrome bay Jun 2, 2020, 2:00 PM

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NetGUID is different for every client

rose egret Jun 2, 2020, 2:01 PM

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oh u r right its generating different for each client 😦

dawn summit Jun 2, 2020, 2:01 PM

#

{
    if (!HasAuthority())
    {
        Server_DoSomething();
    }

    // Code <- that part is not part of the check
}```

chrome bay Jun 2, 2020, 2:01 PM

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You want some code to run on client and server yes?

#

So that's exactly what you want.

#

It's just the client telling the server to run the same function

dawn summit Jun 2, 2020, 2:01 PM

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yes...but when it runs on Listen server it tuns twice

chrome bay Jun 2, 2020, 2:01 PM

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No it won't

dawn summit Jun 2, 2020, 2:01 PM

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well, it does

rose egret Jun 2, 2020, 2:02 PM

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so how do I print the unique id of a replicating actor 😦

chrome bay Jun 2, 2020, 2:02 PM

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It just won't. The Server isn't running input for the clients, and it's the authority

#

So it won't call the function twice

#

I've got this exact setup in multiple places all over our game

dawn summit Jun 2, 2020, 2:03 PM

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Listen server runs inputs from clients...what are you talking about?

chrome bay Jun 2, 2020, 2:03 PM

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No it doesn't...

#

It can't

#

How can it get the input from a clients keyboard?

#

Unless the client is explicitly sending it?

dawn summit Jun 2, 2020, 2:03 PM

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listen server is just player playing and hosting

chrome bay Jun 2, 2020, 2:03 PM

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Yes

#

I give up

#

try it yourself and see

#

It's running its own input

#

So it will call DoSomething() once, for itself.

#

It will not call Server_DoSomething()

#

If it did, you would end up in an infinite loop of the functions calling each other

dawn summit Jun 2, 2020, 2:04 PM

#

@chrome bay oh...jss, you're right -_-

#

sorry

chrome bay Jun 2, 2020, 2:04 PM

#

np's

#

FYI ShooterGame has an example of this

dawn summit Jun 2, 2020, 2:05 PM

#

it does?

#

i need to get one

chrome bay Jun 2, 2020, 2:05 PM

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The weapons call StartFire(), if a client calls StartFire, then internally it calls Server_StartFire(), which just calls StartFire()

#

So it's basically like telling the Server an input key was pressed, sort of.

#

And it simulating the same thing

dawn summit Jun 2, 2020, 2:07 PM

#

i did that and for some reason it just triggered event twice for my listen server, i did something wrong there

chrome bay Jun 2, 2020, 2:07 PM

#

Yeah that's probably something else going on

dawn summit Jun 2, 2020, 2:15 PM

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@chrome bay sorry to poke again, do you know if AnimInstances exist/run on server?

winged badger Jun 2, 2020, 2:17 PM

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they do, dedicated server might not bother simulating bones tho

#

and if you're trying to send a UAnimInstance* over the RPC, think again, its not replicated

dawn summit Jun 2, 2020, 2:20 PM

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nope, i just checking
if (!MainAnimInstance)
and i was not sure if it exist on say dedicated server

chrome bay Jun 2, 2020, 2:22 PM

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yeah they do exist for sure, it's just as Zlo says they may not be doing anything

#

depends on the mesh settings

dawn summit Jun 2, 2020, 2:23 PM

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okay, i won't relate on their events then
i need some however, not sure how will i handle it ;_;

chrome bay Jun 2, 2020, 2:25 PM

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If you mean anim notifies then yeah you can't really rely on them anyway

#

Or at least, they won't be synchronised between clients/server etc.

dawn summit Jun 2, 2020, 2:25 PM

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yep...i've ported (partially) AdvancedLocomotionSystem to replicate, but i have some issues, like Mantle uses notify to teleport the capsule when it ends

#

moved some variables to character movement component so it can be predicted and compressed

#

but it was not the best place to start learning cpp and networking

#

Should be things like key pressed actions send as reliable?

#

before i implement bWantsToDoSomeStuff in CMC

dawn summit Jun 2, 2020, 3:02 PM

#

@chrome bay yep, it seems i know why i had so many functions now...
i could trigger the event by the player itself, and by replicating a state, which should not trigger server replication again

#

oh...i just check if it's simulated proxy

copper grove Jun 2, 2020, 3:42 PM

#

*EDIT fixed (Handle Starting new player / delete on post login is how you do it...)how do you handle clients entering a new map using seamless server travel

#

without it, you'd just call event post login and call it a day, but with it, i dont know what to call on gamemode to handle those players having travelled/spawn a new pawn

odd iron Jun 2, 2020, 3:50 PM

#

Can someone send me the Config for Steam sometime working but just LAN one time showing me

LogSockets: Warning: Tried to bind address with protocol Steam to a socket with protocol IPv4

#

im using this config

📎 unknown.png

sleek current Jun 2, 2020, 4:41 PM

#

Hey, is there a simple way to check whether or not we have an internet connection?

weary mortar Jun 2, 2020, 5:16 PM

#

Hi all, I have an strange issue in my autonomous proxy client, but not in listen server.... the run animation sometimes accelerates and play faster in clients... any hint on what it could be related with?

winged badger Jun 2, 2020, 6:01 PM

#

CMC updating the skeleton twice

meager spade Jun 2, 2020, 6:12 PM

#

@weary mortar are you doing some funky stuff

#

like forcing a non autonomous to autonomou?

#

autonomous

weary mortar Jun 2, 2020, 6:25 PM

#

@winged badger @meager spade thanks for the hint! I really appreciate it!

meager spade Jun 2, 2020, 6:25 PM

#

you could try

#

GetMesh()->bOnlyAllowAutonomousTickPose = true;

#

see if that fixes it

weary mortar Jun 2, 2020, 6:26 PM

#

I think I've found it... In my AnimBp I am setting "Root Motion Mode" to Root Motion from Everything

meager spade Jun 2, 2020, 6:26 PM

#

eww

#

we have Montages Only

#

Everything is terrible

weary mortar Jun 2, 2020, 6:26 PM

#

I think that it can be the issue.... I changed it to fix a weird animation long time ago from the market....

#

yeah... now I can understand why it is terrible 😄

meager spade Jun 2, 2020, 6:27 PM

#

Rootmotion in AnimBP with networking is a no go

#

no RootMotion animations in AnimBP

weary mortar Jun 2, 2020, 6:27 PM

#

so u suggest to use always montages instead animations?

meager spade Jun 2, 2020, 6:27 PM

#

Montages for RootMotion stuff

#

animbp should be non root motion animations

weary mortar Jun 2, 2020, 6:27 PM

#

yes, In my game I avoid using root motion

meager spade Jun 2, 2020, 6:27 PM

#

when networking

weary mortar Jun 2, 2020, 6:28 PM

#

ok, I will tattoo that to don't forget it... It drove me nuts for an entire week!!

#

😄

#

thanks for the hand, guys!! 🙂

meager spade Jun 2, 2020, 6:28 PM

#

we had that issue before

#

so your not the only one 😄

#

then again we do crazy stuff

#

in our game 😄

weary mortar Jun 2, 2020, 6:29 PM

#

hahahaha glad to hear that it was not an easy thing to find

meager spade Jun 2, 2020, 6:29 PM

#

GetMesh()->bOnlyAllowAutonomousTickPose = true; < this here drove me nuts

weary mortar Jun 2, 2020, 6:29 PM

#

ufff now I can breathe again... 😄

meager spade Jun 2, 2020, 6:29 PM

#

its set in only one place, APawn::Possess()

#

and yeah, 2 days to track that bug down :/

#

lol

weary mortar Jun 2, 2020, 6:30 PM

#

😄 yeah that sounds like a really pain!!

#

anyway thanks for always being there to help and hear our lamentations 😄

light fog Jun 2, 2020, 9:17 PM

#

Got a really weird problem, I have packaged my game and when i host a game on my pc, use servertravel and get all player controllers on a new game mode it doesnt work. But when i do the same thing on my laptop it works.

silent phoenix Jun 2, 2020, 9:47 PM

#

Does vehicle movement component have any equivalent to character movement ignore correction / client side movement authority? In c++ or blueprint?

ivory lintel Jun 2, 2020, 9:49 PM

#

Guys...if anyone can help me...
What the better way to setup a player name in multiplayer game using the ue4 framework

#

playerstate

#

???

ivory lintel Jun 2, 2020, 10:18 PM

#

I wanna to use the player state from player state class...I expose the SetPlayerName as an ufunciion but don't work

#

any tip???

dawn summit Jun 2, 2020, 10:29 PM

#

@ivory lintel check
AGameModeBase::ChangeName

ivory lintel Jun 2, 2020, 11:20 PM

#

nice tks

lunar root Jun 2, 2020, 11:35 PM

#

Hey, how can a wait for the PlayerState to replicate inside my UMG widget ?

#

I have the PlayerController, but it can happen that the PlayerState inside the PlayerController is still null

#

and I need to wait until its not longer null before rendering the UI

meager spade Jun 3, 2020, 1:53 AM

#

pulse witha timer

#

tho

#

we wait till OnRep_PlayerState in the controller

#

and fire a delegate

#

which then updates our widgets

#

so widget binds to it if the PlayerState is null

#

and waits

#

simples 😄

lunar root Jun 3, 2020, 2:12 AM

#

thats pretty much what i have

#

but this doesnt work for the server since the server doesnt call on_rep

winged badger Jun 3, 2020, 2:43 AM

#

server doesn't need to wait for it to replicate

fluid prawn Jun 3, 2020, 2:50 AM

#

Question regarding netcode of rotation or translation in Local Space vs World Space. For replication do I need to convert any Local Space transformations to World space to achieve proper replication. I see in the engine code that Add Location Rotation and Add Relative Location Call the (root) Move Component Update which get converted to World Space anyway?

#

I am coding A plane movement Component from scratch so I'm applying rotations and forward vector acceleration in Local space so I am curious if I need to convert those rotations and locations from local to world?

winged badger Jun 3, 2020, 3:54 AM

#

it doesn't matter, as long as you do same conversions on both sides

#

having said that, depending on coordinate space, local space vectors, typically having lower magnitude, might allow for better compression

fluid prawn Jun 3, 2020, 4:03 AM

#

When you mean same conversions on both sides? And yes you're definitely right about the lower magnitude better to compact.

#

The reason I ask was since I am doing a Movement Component from Scratch I see actually on UE4 Low level movement component they move the root component as UpdatedComponent->MoveComponent(World Delta, World Rotation, hitflag ...)

winged badger Jun 3, 2020, 4:05 AM

#

if you send a local space vector and client expects a local space vector

fluid prawn Jun 3, 2020, 4:05 AM

#

ofcource

winged badger Jun 3, 2020, 4:05 AM

#

doesn't take rocket science to transform it to world coordinates on the other side

fluid prawn Jun 3, 2020, 4:06 AM

#

Yea just a Matrix transformation. It seems their Add Local Rotation and Relative convert it for you to world space

#

and pass that transform to MoveComponent anyway

#

When I get to that step

#

I'll let you know

#

I will be coding Client prediction from scratch on top of my movement component just more or less curious about how UE4 does it since they are AAA company and they obviously have alot more developers pushing code to it

winged badger Jun 3, 2020, 4:08 AM

#

then look at their github for the new one

#

since CMC is hardcoded monolithic monstrosity that should never have existed

fluid prawn Jun 3, 2020, 4:09 AM

#

Yea

#

I dug through the current one

#

its very messy

#

the replication code and Movement code should be seperate

#

currently they are in one class

#

however.. their movement code

#

is not bad

#

just the way they did net code was a bit sloppy

winged badger Jun 3, 2020, 4:10 AM

#

until you try something non standard, like having client side movement with AIController

fluid prawn Jun 3, 2020, 4:10 AM

#

not sloppy as in bad sloppy as in just how they put the classes together

winged badger Jun 3, 2020, 4:11 AM

#

or anything really where the controller is not APlayerController and Pawn is not ACharacter

#

kaboom

#

to make it worse, it replicates via the Character directly

fluid prawn Jun 3, 2020, 4:11 AM

#

yes

winged badger Jun 3, 2020, 4:11 AM

#

and PC also has parts of its logic

fluid prawn Jun 3, 2020, 4:11 AM

#

thats another thing

winged badger Jun 3, 2020, 4:11 AM

#

see: TickActor

fluid prawn Jun 3, 2020, 4:11 AM

#

that was odd

#

their player controller

#

"Is a connection"

#

and it has the net driver shit

#

which is wack

#

that still confuses me

winged badger Jun 3, 2020, 4:12 AM

#

you have to override the roles manually, if you do this, or CMC will start doing shit like ticking your skeleton twice per frame

fluid prawn Jun 3, 2020, 4:12 AM

#

I never dug into the net driver just as far as when the server needs to do net corrections

#

it's done on the PC

#

it seems

#

So I was told by some people that they are modularizing the net replication

#

for movement

#

one dude is currently working on it

#

it's a "plugin" but I am curious how exactly you Use it if you make your own movement component.

lunar root Jun 3, 2020, 6:59 AM

#

server doesn't need to wait for it to replicate
@winged badger so basically I have to make an if statement if the PlayerState is already set otherwise bind to the delegate?

winged badger Jun 3, 2020, 9:35 AM

#

that is pretty standard

chrome bay Jun 3, 2020, 9:41 AM

#

@fluid prawn https://github.com/EpicGames/UnrealEngine/tree/master/Engine/Plugins/Runtime/NetworkPrediction

#

CMC is a dinosaur. Thankfully it looks like they plan to replace it at some point.

#

No ETA though, and I doubt CMC will ever be removed entirely as too many games depend on it.

#

Wouldn't be surprised if UE5 still has it at launch.

stoic acorn Jun 3, 2020, 9:45 AM

#

404

chrome bay Jun 3, 2020, 9:47 AM

#

Need to be logged in to Github and have your account linked

lunar root Jun 3, 2020, 10:53 AM

#

aight ty @winged badger

polar wing Jun 3, 2020, 12:21 PM

#

I can't even begin to explain the nonsense I had to get through to make my space project work with CMC

#

networking that stuff wasn't easy, but I found some hacky workarounds

sullen umbra Jun 3, 2020, 1:03 PM

#

hello guys, forgive me but I'm getting crazy.. I'm quite new to UE4, and I'm trying to make a simple LOCAL multiplayer minigolf like game in Unreal through blueprints. So, in my GameMode I set up a function to "getspawnpoints" according to playerstart class, and then another function to spawn players with their own playercontroller index according to the array created in the "getspawnpoints" function.
So now all the players are up and running at the same time, but I would like to implement a turn system so that I can enable player0 to act first, then player1, then player2, and so on. So I was thinking about creating custom events for turn begin, and turn end, but I'm stuck at this point. Can you redirect me to a comprehensible guide to do this, or can you tell me how to achieve this? I can provide GameMode BP if needed. Thanks a lot

lunar root Jun 3, 2020, 1:43 PM

#

@sullen umbra in the GameState you have an array for PlayerStates

#

you could make an variable within the GameState which holds the index of the current player

#

So you can always access the PS by using GameState->Players[INDEX_OF_PLAYER]

#

and as soon the turn ends you just count up the index until reaching the end of the Players array, then set the variable to 0 again for the first player and repeat from there

sullen umbra Jun 3, 2020, 1:48 PM

#

gonna try now, but this still looks like hieroglyphs to me 😭

stoic acorn Jun 3, 2020, 1:58 PM

#

@sullen umbra This series of tutorials will help you get setup with this https://www.youtube.com/watch?v=JF3KFWF8hUs

YouTube

Strigifo

UE4 / Unreal Engine 4 Multiplayer - #01 Local Multiplayer Set up

UE4 / Unreal Engine 4 Multiplayer Playlist:
In this collection of videos, we will cover setting up a project for both local and networked multiplayer projects.

This Video:
In this video, we set up our project and get an understanding of what we will need to begin spawning our...

▶ Play video

#

works perfectly for splitscreen local co-op

#

doesn't have to be splitscreen obvs

sullen umbra Jun 3, 2020, 1:59 PM

#

@stoic acorn yes I followed up that tutorial, but the problem here is to set up a turn system to tell which player should act

#

actually my gamemode is the same as that tutorial

stoic acorn Jun 3, 2020, 2:01 PM

#

so it would probably be set up in the same way as a turn based game. I bet there are a ton of tutorials like that

sullen umbra Jun 3, 2020, 2:05 PM

#

I don't know.. I can only find rpg based games which are way more complex than the thing I'm trying to achieve.. that should be super simple in theory, but in practice I get lost

winged badger Jun 3, 2020, 2:06 PM

#

gamemode decides which players turn it is

#

then it just informs the players of that

#

a client RPC to the client controller is appropriate here

#

do not multicast from gamemode 😄

worldly raft Jun 3, 2020, 2:20 PM

#

Can anyone help explain how to create a character selection at the start of the game like in ARK, Hurtwold and other types of multiplayer games?

spark fossil Jun 3, 2020, 2:28 PM

#

@worldly raft You can set up a blueprint for your character selection "booth" with a camera with a skeletal mesh component for the current character. Then create a set of character buttons in UMG which replaces the mesh with that character's mesh when clicked.

worldly raft Jun 3, 2020, 2:36 PM

#

@spark fossil thanks for the advice 👍😊 any good documentation or tutorials that show steps to create this?

spark fossil Jun 3, 2020, 2:41 PM

#

@worldly raft Np. I don't I'm afraid, but I have I did it that way in my game and it seems to work fine.

#

📎 HeroSelect.mp4

#

The blueprint actor is floating in the air but is set to not be visible to any other cameras.

worldly raft Jun 3, 2020, 2:46 PM

#

That looks amazing! Nice work

#

I’m assuming all characters use the same skeleton?

lunar root Jun 3, 2020, 2:47 PM

#

@worldly raft @spark fossil What I have done is creating a new Level (Hero Select Level), and do everything there. I spawned an Actor which holds a SkeletalMesh, as soon the player clicks on a button to select a character an RPC is send t othe server, the server then selects the character and send an RPC back to the client who then updates the SkeletelMesh of my previous Spawned actor to the new one

#

When the Selection is done I use seamless travel to persist the data to the new level and start from there

#

But this technique makes only sense when you dont have to swap in Mid-Game

spark fossil Jun 3, 2020, 2:48 PM

#

@worldly raft Thanks, but all credit there goes to the marketplace asset creators 🙂 Nope, all different skeletons.

jolly siren Jun 3, 2020, 2:49 PM

#

My fix to the PIE window net mode bug in 4.25 made it into 4.25.1. Just letting people know who were having issues with it https://github.com/EpicGames/UnrealEngine/pull/6963

lunar root Jun 3, 2020, 2:49 PM

#

@jolly siren still waiting for server travel in PIE -_-

spark fossil Jun 3, 2020, 2:50 PM

#

@lunar root Sounds good. I've taken a similar approach with the RPC calls when switching hero or skin, but just kept it in the same map so no travel. That was maybe just laziness though on my part.

lunar root Jun 3, 2020, 2:51 PM

#

Fully understandable, just took me two days to get the travel to work ......

#

xD

spark fossil Jun 3, 2020, 2:51 PM

#

haha ouch

lunar root Jun 3, 2020, 2:51 PM

#

It's supposed to be a oneliner, yeah.. no

#

I traveled to the new map and couldnt move the entire time

#

and was nearly crying

#

and randomly i realized, wait the server isnt running in the task manager

#

basically the server crashed after traveling, and since i have to test in standalone because the editor doesnt support server travel i didnt realize

spark fossil Jun 3, 2020, 2:53 PM

#

painful 😦

sullen umbra Jun 3, 2020, 2:53 PM

#

I give up, thanks anyway 😭

lunar root Jun 3, 2020, 2:53 PM

#

@sullen umbra Okay dude listen

spark fossil Jun 3, 2020, 2:53 PM

#

I feel your pain though. I just spent 3 days fixing bugs that weren't there in PIE

lunar root Jun 3, 2020, 2:53 PM

#

You set a GameMode per Map

#

this GameMode initializes a GameState and PlayerStates

#

those are replicated to the clients, but can only be changed on the server side

#

Mean the client can read this information and process it, but not change it

#

Since you have an Array (a list) of PlayerStates you can just say, okay its the turn of the player with position 0 in the PlayerStates array

spark fossil Jun 3, 2020, 2:55 PM

#

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

lunar root Jun 3, 2020, 2:55 PM

#

when he is done you can just increase the so called index to 1

#

When player 1 is done increase it to 2 etc

#

and when you reach the limit of the array (lets say 5) you just resetz the counter to 0 again

#

also super useful: http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf
@spark fossil Didnt know about this, might have to look into it too, i feel like i know replication but sometimes i just sturggle with things like UMG etc

#

because it needs to wait for the PlayerState etc

spark fossil Jun 3, 2020, 2:58 PM

#

Same, but this document comes in handy even just to look something up

#

Still use it all the time

lunar root Jun 3, 2020, 2:59 PM

#

@spark fossil yesterday i looked up repgraph

#

and was like wtf is this

spark fossil Jun 3, 2020, 3:00 PM

#

Oh, first I've heard of that

#

That for large scale multiplayer I guess?

lunar root Jun 3, 2020, 3:00 PM

#

Yeah, dont do this

#

I guess, i heared @meager spade talking about it and just looked it up

dawn summit Jun 3, 2020, 3:01 PM

#

I've seen people discussing CMC. Pain exist...

#

I hope there will be some brave man who will make new plugin with component that can be plugged in to any pawn

lunar root Jun 3, 2020, 3:02 PM

#

Isnt this the NetworkPredictionPlugin?

#

idk anything bout it just heared it often when talking about CMC

chrome bay Jun 3, 2020, 3:03 PM

#

yep

#

Isn't finished yet. no eta

#

Also don't expect it to be plug-and-play, will still be a lot of core work to do, and it's unlikely to be something you can use in BP.

lunar root Jun 3, 2020, 3:05 PM

#

I mean i use CPP primarily

#

but idk what the benefits are in using the NPP > CMC

dawn summit Jun 3, 2020, 3:05 PM

#

to replace CMC it should be universal for cpp and bp

#

and cmc does more than just replication

chrome bay Jun 3, 2020, 3:06 PM

#

It won't be, and it probably won't replace CMC

#

CMC will probably still exist alongside

dawn summit Jun 3, 2020, 3:06 PM

#

AI navigation is handled by CMC

scarlet cypress Jun 3, 2020, 3:09 PM

#

Does someone know this bug? There are two widgets being displayed on top of each other and one version is inactive. It is only a problem when there are multiple players in the game, like if the other player would create a second widget for you. But as you see the HUD events plays local and dont get replicated.

#

📎 Unbenannt.png

#

📎 Unbenannt2.PNG

spark fossil Jun 3, 2020, 3:18 PM

#

@scarlet cypress Try doing a check to make sure that the Actor is locally owned

#

What BP is that in the screenshot?

scarlet cypress Jun 3, 2020, 3:22 PM

#

The PlayerCharacter

#

Thanks! This fixed it! I still dont understand why this bug occurred tho..

📎 Unbenannt.PNG

spark fossil Jun 3, 2020, 3:40 PM

#

@scarlet cypress Glad it worked 🙂 It's because this will be ran for every player character in the level, so you'll get a hud widget for each one.

scarlet cypress Jun 3, 2020, 3:58 PM

#

Okay, thats kind of wierd tho because it runs 1 time on each player but i gets 2 widgets for both...

spark fossil Jun 3, 2020, 4:11 PM

#

but if it runs once for each player character, and you have 2 player characters in your level at the time you'll get 2 widgets on the player's screen right?

#

So you could either check that the playercharacter is locally controlled, as you did, or move the widget spawning code into the HUD or something.

meager spade Jun 3, 2020, 4:41 PM

#

how do you actually kick someone from a steam lobby

thick sand Jun 3, 2020, 4:41 PM

#

Good Morning. Anyone in the mood today to help a fellow hobby dev? In specific, I am trying to control two pawns at once (a first person and 3rd person pawn). I have it working single player but everything gets messed up once I try to introduce multiplayer (and not just because of replication, something else is going on).

spark fossil Jun 3, 2020, 4:55 PM

#

@thick sand How are you controlling the second pawn? Via commands to an AI I guess?

thick sand Jun 3, 2020, 4:57 PM

#

@spark fossil Right now, I posses the thirdperson pawn with an AIController spawned by the first person. I then just control the pawn vie the firstperson pawn.

spark fossil Jun 3, 2020, 4:58 PM

#

@thick sand Not sure if this is your issue, but the ai controlled pawn will always be server owned

#

so you would need to issue any commands via an rpc on the player controlled character or player controller or something else that the local player "owns"

#

The ai controlled pawn would be a simulated proxy for the client, so they can't really do anything with it directly

thick sand Jun 3, 2020, 5:00 PM

#

@spark fossil That makes sense. Let me see if I can run a few tests.

#

@spark fossil Successful initial tests. Thanks! So I am calling a server RPC in the FPPawn which then calls the function on the thirdperson char

spark fossil Jun 3, 2020, 5:04 PM

#

@thick sand Good stuff. Yeah that sounds right.

#

I tried various ways to get the client to spawn an AI as an Autonomous Proxy instead of Simulated Proxy, but couldn't figure out any non horrible way of doing it.

#

So it seems like you just have to relay the commands

thick sand Jun 3, 2020, 5:06 PM

#

gotcha

#

thanks again. The first person pawn is actually going to be a VR pawn. Let's see what challenges I run into next 🙂

spark fossil Jun 3, 2020, 5:07 PM

#

np - gl!

thick sand Jun 3, 2020, 5:11 PM

#

ty vm

thick sand Jun 3, 2020, 5:35 PM

#

@spark fossil One weird thing I am experiencing is that everything seems to work fine when running a multiplayer test (both dedicated and non dedicated checked) but when I try hosting the game on one comp and joining on another (via steam) the client somewhat jitters in place rather then moving. Any thoughts?

spark fossil Jun 3, 2020, 5:36 PM

#

@thick sand Is it the AI character or the player controlled one?

thick sand Jun 3, 2020, 5:36 PM

#

AI. The other one is just a static camera as of now

spark fossil Jun 3, 2020, 5:37 PM

#

ah ok

#

So, you're taking an input from the player, calling a Server RPC on the Player character, which tells the AI character to move?

thick sand Jun 3, 2020, 5:42 PM

#

VR Pawn takes the input, calls a RPC (server event) on itself which then calls an event on the AI pawn. That event I have attached to an authority switch. The authorized exec calls the Multicast version while the remote exec calls a server RPC . The multicast event is what adds the movement input to the pawn

spark fossil Jun 3, 2020, 5:43 PM

#

afaik all of the AI pawn's movement etc. should be done on the server, and have it replicate via its movement component.

#

It will be a simulated proxy on the client so they won't be able to move it, but also I don't think the navmesh exists on the client (I could be wrong but I'm fairly sure on that)

#

As long as the Ai pawn is replicated and has a movement component, it should update itself on the client when you move it on the server

thick sand Jun 3, 2020, 5:48 PM

#

ok, so therefore the movement should be done on the server rather then a multicast?

#

maybe its getting dbl input and conflicting??

#

its also a bit weird that this is not present when testing as a "dedicated server"

spark fossil Jun 3, 2020, 5:52 PM

#

it could be that, but either way I would move it on the server and just let it replicate. If you use a behahavior tree instead too, it will have to be server only for that stuff.

#

There seems to be a lot of issues that are not picked up when playing in editor. EQS queries on the client seem to run fine until you deploy and test it on 2 different machines :/

thick sand Jun 3, 2020, 5:58 PM

#

ok, thanks. Let me try

thick sand Jun 3, 2020, 6:14 PM

#

@spark fossil I appreciate the help and hope its not a bother. I changed it to VRPawn (Server RPC) -> ThirdPersonPawn (run on server) -> add movement input. Unfortunately, its still jittery.... I've gotten to this point before and decided to start over since I wasn't sure what was going on.. ugh

#

third person char

📎 unknown.png

spark fossil Jun 3, 2020, 6:17 PM

#

@mellow dome It's no bother at all. Hm strange. Is it moving but jittery movement or is it just staying still and jittering a bit?

thick sand Jun 3, 2020, 6:18 PM

#

First person (VR Pawn)

📎 unknown.png

#

Its a bit hard to tell but it looks like its moving but not getting anywhere and just jittering

spark fossil Jun 3, 2020, 6:21 PM

#

But it was moving when playing with 2 PIE windows?

#

I've never tried moving an ai like that tbh, without a navmesh

#

I thought you could only do that with a playercontroller

thick sand Jun 3, 2020, 6:23 PM

#

I tried using a player controller and ran into issues as well. Everything seems to work fine in 2 PIE windows

#

when I "launch game" and then join the MP session, the client def tries to move but jitters

spark fossil Jun 3, 2020, 6:24 PM

#

hm weird

#

You could use a navmesh and move it like a typical AI but it would be a bit of work to set up and I'm not sure how responsive it would be to the direct control

foggy idol Jun 3, 2020, 6:26 PM

#

How do I get the number of people spectating a player

thick sand Jun 3, 2020, 6:27 PM

#

yeah, thanks for the help. It always seems like the projects I want to work on are slight fringe cases and that combined a lack of knowledge and it makes for a dangerous combination

spark fossil Jun 3, 2020, 6:28 PM

#

@foggy idol You can use GameMode -> Get Num Spectators

#

@thick sand I know the feeling 🙂

foggy idol Jun 3, 2020, 6:28 PM

#

I want to get the value for a specific player

#

I go into spectator mode by setting view target

#

I want to find out how many people are currently viewing

#

I don't mind if c++ is involved

dry turret Jun 3, 2020, 6:31 PM

#

i'm curious about the Get ServerWorldTime node - what happens when the server is left running for a long time? i just found that my map has been running for hours instead of ending after 10 minutes, i assume the value got too high or something. is there any way to reset it to 0?

foggy idol Jun 3, 2020, 6:50 PM

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So maybe do if(IsLocallyControlled() || CurrentViewers.Contains(GetLocalFirstPlayerController()))
@thin stratus
Is current viewers an accessible array or do I have to make it and set it on my own

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And how would i implement this

oak thunder Jun 3, 2020, 7:11 PM

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Hello Guys, have anyone already created a video chat using UE for a multiplayer game app?

shy kelp Jun 3, 2020, 7:21 PM

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Im replicated montages with root motion and getting up wonky results. I have a run on server custom event running a multicast, which as a repnotify triggering the montage. https://gyazo.com/ceb4111533516388ac7735b5cc105ea0

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https://gyazo.com/527fe06bc4c8da4ba1cb39e5b6d2faac

thick sand Jun 3, 2020, 7:30 PM

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@spark fossil It seems my pawn moves but really slowly. I would think its because of lag but it works fine when just controlling a single pawn. Maybe the extra pawn is too much? ugh, idk

foggy idol Jun 3, 2020, 7:33 PM

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Maybe you have too many RPC's in the character

quartz anvil Jun 3, 2020, 8:04 PM

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@thick sand did you try to turn on "orient rotation to movement" in character?, also try to disable particle and try again. solution :https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/71123-multiplayer-3rd-person-and-terrible-stuttering

Unreal Engine Forums

Build powerful visual scripts without code.

light monolith Jun 3, 2020, 8:56 PM

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How do i test to see if the sound is playing for everyone on the server? On 1 computer

restive flicker Jun 3, 2020, 9:02 PM

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Check on each client

light monolith Jun 3, 2020, 9:07 PM

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How do i check if the bullet firing sound is playing in another client if i have to click to fire in the current client tho?

spark fossil Jun 3, 2020, 10:30 PM

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@thick sand Hm weird. Guessing that's just where it's trying to move at one and then being brought back by the authority.

thick sand Jun 3, 2020, 10:46 PM

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@quartz anvil I just tried both on and off (was on) and still does a stutter step.
@spark fossil Thanks. That's kind of what I'm thinking as well but can't quite sort it out atm. Comparing it to a reg ThirdPerson pawn setup, it has 4 x as many RPC calls per sec (2k - 8k) .

spark fossil Jun 3, 2020, 11:19 PM

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@thick sand I don't think it would be too many RPC calls tbh. I've never tried moving an AI pawn with input rather than a BT/Navmesh, but I'm guessing there's some issue there. GL, hope you crack it.

harsh lintel Jun 3, 2020, 11:59 PM

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I'm using SetActorRotation on the server, it is not reflected on the client tho

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The client on the left calls the server RPC that updates the rotation and it isn't reflected, the client number 2 on the right does update the rotation

📎 rotatt.gif

twin storm Jun 4, 2020, 1:13 AM

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Hello everyone, I'm new to Unreal Engine development. I was hoping someone could provide me with some insight on to how a custom client side tcp connection of an online UE4 client might look like (specifically on an MMORPG). I know how to construct the TCPSocket and connection, my question is more so how to effectively process communications. As far as I know I have two options...

Run a Network Layer on a separate thread and allow the game to queue commands to submit data to a server. Similarly, allow the Network layer to queue commands on the game thread to process packets/data that is sent to us from the server.
Run the Network Layer on the same thread as the game and depend on Ticks() for processing data that the server sends to us. I'm not sure if the Tick system occurs often enough where this would be a good idea.

If I were to not run the network layer on a separate thread AND I was constantly listening for data from the server instead of only checking during Ticks... Wouldn't this cause the game to have lots of lag due to constantly processing something on the same thread?... or is this a trivial task for the game engine?

lunar root Jun 4, 2020, 1:55 AM

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@twin storm I doubt that I can help you there because this advanced stuff you are talking about, but maybe take a look at ReplicationGraph, it depends on ReplicationDriver and allows you to customize the replication logic

twin juniper Jun 4, 2020, 3:19 AM

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hello! i've here some blueprints for a door that i am attempting to replicate
the server can open and close it fine
it's also replicated fine (client sees it open and close in sync perfectly)

however
the client cannot interact with the door - ie cannot open or close it

📎 unknown.png

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does anyone have any pointers?

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also dooropenclient node is set to reliable run on server

winged badger Jun 4, 2020, 3:34 AM

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you can't send an RPC thru an actor you don't own

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exception being multicasts from server

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all you get is "no owning connection..." warning in your output log with this

twin juniper Jun 4, 2020, 3:35 AM

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i see, thank you
what would be an alternative solution? i'm new to UE4

winged badger Jun 4, 2020, 3:38 AM

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sending an RPC with a door reference as input through your PlayerController, PlayerState, Pawn or other actor you do own as a client

twin juniper Jun 4, 2020, 3:39 AM

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ahhh ok so you reckon i should handle the input through the player controller?

acoustic inlet Jun 4, 2020, 5:25 AM

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Anybody know why my Map data gets swallowed? Before calling the function the map has information, but when I add a breakpoint there's nothing in the Map value

📎 unknown.png

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Seems to disappear during the information transfer from client->server

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Oh...

📎 unknown.png

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but why tho

vivid seal Jun 4, 2020, 6:12 AM

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I was bummed when I found out about that. You can kinda cheat it by making an array of structs where each struct is a key value pair, but it’s obviously not as good as having a map.

shrewd tinsel Jun 4, 2020, 6:47 AM

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@acoustic inlet ue4 doesnt replicate maps ...

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guys, what is the correct way to spawn a player in multiplayer game?

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do i do it on gamemode? or on pawn?

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or on player controller?

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spawn actor from class > possess?

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in blueprints

fluid prawn Jun 4, 2020, 9:33 AM

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Gamemode

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game mode runs on the server

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Last I recall you can use the game mode to get the PC's which are connections and possess w/e thing you're spawning that takes a player controller

chrome bay Jun 4, 2020, 9:37 AM

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The Gamemode is what usually handles pawn spawning yeah, but it depends on the game.

fluid prawn Jun 4, 2020, 9:37 AM

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ya

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i think for split screen

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or some local mulitplayer

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there is that edge case

chrome bay Jun 4, 2020, 9:38 AM

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Same for splitscreen or online really

fluid prawn Jun 4, 2020, 9:40 AM

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I wonder how games that are competitive handle spawning

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if its done server side

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like I assume if you have high ping you might have a delay on your spawn versus someone who has lower ping

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and thus create potentially a disadvantage

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Unless you server and client time stamp

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and compare them and then interp it or something

chrome bay Jun 4, 2020, 9:41 AM

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Well the pawns will always be spawned server-side. If you have additional latency to the Server and it takes you longer to receive the pawn there's not much that can be done about that.

fluid prawn Jun 4, 2020, 9:42 AM

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yeah

chrome bay Jun 4, 2020, 9:42 AM

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But that will affect the whole game too, not just pawn spawning/possession.

fluid prawn Jun 4, 2020, 9:42 AM

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yeah

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time to register kill

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etc

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all adds up

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in the end

chrome bay Jun 4, 2020, 9:42 AM

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yeah, it's quite hard to build the systems to workaround/support that

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Can be done, just usually very game-specific

fluid prawn Jun 4, 2020, 9:43 AM

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untill we get quantum entanglement internet speed

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and then GG

chrome bay Jun 4, 2020, 9:43 AM

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yep 😄

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one day...

fluid prawn Jun 4, 2020, 9:43 AM

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haha

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man

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imagine the netcode

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it would be so clean

chrome bay Jun 4, 2020, 9:43 AM

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Then everything will run in the cloud, and it'd be streamed

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Would be great

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Everything would be a single player game.

fluid prawn Jun 4, 2020, 9:43 AM

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lol yea

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I mean

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theoretically it's possible but we gotta wait

small marsh Jun 4, 2020, 12:09 PM

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Hello, guys. I'm working on card multiplayer game. Can i ask some questions about logic and Game Framework(GameState, GameMode)?

bitter oriole Jun 4, 2020, 12:09 PM

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Asking questions is strictly forbidden here 😏

small marsh Jun 4, 2020, 12:11 PM

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i take this risk )

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In my card game i need show to players different cards location. Gamemode has refs to all cards. Which classes must handle the logic of card distribution

#

📎 Playe1.jpg

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📎 Playe12.jpg

bitter oriole Jun 4, 2020, 12:15 PM

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You should think about gameplay framework actors (pawn, game mode, player controller, game state, player state) in terms of where they are

#

gamestate/playerstate are basically just shared data, changed on server and replicated to everyone

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game mode is server only

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player controller is server + owning client

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You could very well put your logic distribution in any of these classes, but you have to think about who should be responsible

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If it's the server, then game mode would make the most sense

small marsh Jun 4, 2020, 12:21 PM

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Yes, in the current prototype of the logic, the game mode is responsible for the distribution of cards, but i need to make each player see the process differently: their cards face down, and the cards of the other players face up. I am replicating the cards themselves, but I am not replicating their movement because I need to display them differently for each player

bitter oriole Jun 4, 2020, 12:22 PM

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Seems like the right thing to do

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You don't need to be replicating more than an identifier for each card anyway

small marsh Jun 4, 2020, 12:25 PM

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📎 unknown.png

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on first iteration of card distribution each player see different card movement(different locations) now i can't understand how i can change location of object for each player differently

bitter oriole Jun 4, 2020, 12:30 PM

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You could simply set the owner of each card actor as the player controller owning the card, and then in your animation code, check whether the owner is non-null, and a local player controller

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If both things are true then the animation is for the owning player, if not, for a remote player

small marsh Jun 4, 2020, 12:32 PM

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Thank so much)

small marsh Jun 4, 2020, 12:48 PM

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📎 unknown.png

small marsh Jun 4, 2020, 1:55 PM

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why can't an actor be replicated to other players?

bitter oriole Jun 4, 2020, 1:57 PM

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Actors can always be replicated to other players, but game mode in particular is not

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By design

small marsh Jun 4, 2020, 2:01 PM

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I created cards in the game mode and they are visible to all players. Then I try to call an event on a card with a game mode, but it only works on the host

bitter oriole Jun 4, 2020, 2:05 PM

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Sounds like the card actor is not replicated

small marsh Jun 4, 2020, 2:09 PM

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even if it is visible to other players after creation? responsible for this is "net load on client" and "replication" is checked

📎 unknown.png

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Maybe there are replication conditions about which I do not know?

meager spade Jun 4, 2020, 2:48 PM

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you cant access GameMode

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from any client

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even for the cards

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GameMode forces itself away

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your cards should be in some other Manager you make yourself

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which all players can access

small marsh Jun 4, 2020, 2:51 PM

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GameState ?

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what class should the manager be in?

meager spade Jun 4, 2020, 2:57 PM

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you can make your own

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and place in the level

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just based on AActor

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but GameState can be accessed by any player

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so might be better place

winged badger Jun 4, 2020, 2:58 PM

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separate actor does avoid clutter

small marsh Jun 4, 2020, 3:04 PM

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If I understand correctly, i just need to create objects in the scene and then get a link to them in GameMode. And when will I call the events of these objects, will replication work?

meager spade Jun 4, 2020, 3:04 PM

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as long as client doesn't access the game mode

small marsh Jun 4, 2020, 3:06 PM

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LevelBlueprint good place?

meager spade Jun 4, 2020, 3:06 PM

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for?

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just make a Actor

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Always relevant

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replicated

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place in level

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and use that for your cards

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GameMode can get that actor via GetAllActorsd

small marsh Jun 4, 2020, 3:07 PM

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i get it

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tnx

woeful jacinth Jun 4, 2020, 3:35 PM

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Hello! I have a question about event tick for a race car controls and multiplayer! The controls are triggered in virtual reality so I have to use event tick to always check if an actor is overlapping or not.

#

when it comes to multiplayer, I want to make it so the server stays around 120 tics. I know that I will have to account for someone not running the game at 120 FPS. How would I go about making the server account for that player lagging/low fps, but still properly replicate their pawn movement to other players? Do I basically need to make it somewhat predict what the player will do or just store the players values from last tic and use those until the server receives updated values from the player?

chrome bay Jun 4, 2020, 3:42 PM

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players might extrapolate other players' movement locally, but you don't do it on the Server

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You won't get client packets at a steady 120Hz rate anyway, even if they're running at 120FPS or higher.

woeful jacinth Jun 4, 2020, 3:47 PM

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Where would you suggest I look in terms of making the movement stable?

#

I'm good at self teaching, I just need a pointer in the direction I need to go

chrome bay Jun 4, 2020, 3:49 PM

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If you're using physics vehicles you've entered a world of hurt is all I can say

woeful jacinth Jun 4, 2020, 3:49 PM

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Still possible though I assume?

chrome bay Jun 4, 2020, 3:49 PM

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Negative

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I mean, you can use them in multiplayer sure, but smoothing / interp is extremely difficult and usually game-specific

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Thankfully since it's physics you don't need to do smoothing, all clients will be running the physics scene between updates anyway at whatever their framerate is

woeful jacinth Jun 4, 2020, 3:51 PM

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I could leave the physics calculating up to the client, varify through some prediction, and just replicate the pawn position and animations to other players maybe?

chrome bay Jun 4, 2020, 3:51 PM

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Server-Auth is basically not possible though, so what you tend to do is just fire an unreliable RPC to the Server each tick which contains the players current input and their latest physics state.

woeful jacinth Jun 4, 2020, 3:51 PM

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I could not train an AI to auth?

chrome bay Jun 4, 2020, 3:51 PM

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nope

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You can add server-side checks for blatant cheating ofc

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How advanced you go with that is up to you

woeful jacinth Jun 4, 2020, 3:52 PM

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Blatant cheating is my main concern

chrome bay Jun 4, 2020, 3:52 PM

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yeah I'd just protect against that, even if it's quite rudimentary

#

But generally with physics and networking you just have to lean towards trusting the client a lot more than you do with kinematic movement (aka characters)

woeful jacinth Jun 4, 2020, 3:53 PM

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ya, the physics I feel like I can smoke out through scripting

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like when you see other players, you will only be seeing their pawn. Your client will have no awareness of their hovering or thrust power

#

Thank you!

chrome bay Jun 4, 2020, 3:55 PM

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It's a complex topic in all honesty, comes up here quite often - no one-size-fits-all solution though unfortunately!

woeful jacinth Jun 4, 2020, 3:59 PM

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Sadly not, thankfully I know it is a challenge

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does not seem hard from what I am reading, just tedious and some complex thought

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Getting 8 players stable will be fun lmao but doable

chrome bay Jun 4, 2020, 4:01 PM

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I've been doing the client-auth, server-verify approach for a while, it's quite simple to set that up. It doesn't look great on remote clients but is playable for my use case

woeful jacinth Jun 4, 2020, 4:03 PM

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That is what I'm looking at. I know I will have to check the client to make sure players are not running this tool that lets you teleport your HMD location

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by literally hacking you play space. Will be the only real way players can get ahead. The server will just varify the values of their cars thrusters and hover calculations

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I know for only 8 players, the event tick should be decent since it is used in a couple other 10+ player vr games to calculate movement with relative stability.

chrome bay Jun 4, 2020, 4:09 PM

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I've not done VR but I can also imagine that client-auth is the only way to go there, because it would be pretty jarring to be snapping constantly from corrections.

woeful jacinth Jun 4, 2020, 4:13 PM

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That is why I feel training a simple AI to watch values would be useful. Not really constantly correcting, but looking for areas that need correction without putting load on the clients. Say if I was to train it to look for a car rapidly changing values(a spin out or flip would generate these), I could have the AI flag that and set them back on the track. Or if they lagged and their values do not line up with where they should be by some margin, the AI could correct.

#

Kind looking for values that fall off the bell curve model

void mantle Jun 4, 2020, 4:19 PM

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Hi all. Wanted to see if anyone was able to integrate a grpc plugin into ie4 4.25?

lunar root Jun 4, 2020, 4:33 PM

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Question from a new game dev here, when I do a Multiplayer game where exactly should I start? With the menu? Hero Selection? Game Mechanics? I feel really lost to the honest since everything goes hand und hand

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And I don't rly have a clean way to go

woeful jacinth Jun 4, 2020, 4:33 PM

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

#

I started there

#

It will explain everything to you.

lunar root Jun 4, 2020, 4:34 PM

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Ok didn't read it but I guess it's to read it now

woeful jacinth Jun 4, 2020, 4:34 PM

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I would start with your game mechanics. Make a base of everything. Base character. Base weapon. Base picked up item

#

That will explain the flow

lunar root Jun 4, 2020, 4:35 PM

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Aight ty

woeful jacinth Jun 4, 2020, 4:35 PM

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you should build your game mechanics accounting for what is in there

#

Also, limit use of event tick if you can help it lmao

#

on the characte/pawn

novel siren Jun 4, 2020, 4:38 PM

#

hey everyone. Got a question. I am working on an inventory and equipment system. The inventory system replicates correctly. The issue I have is on the equipping items. To equip items my system spawns the actor in (spawn actor by class). To get the spawn actor to work I have had to set every component to replicate. Then on a repnotify, I use attach to component to attach the actor to the correct component of the character. This is where the issue comes up. It appears the actor's transform is being edited so that it appears slightly rotated and far up and to the right of the character. Everything I read only says that attach to component has replication issue when the components of the actor being attached are replicated, but they have to be replicated for it to spawn. Any ideas/suggestions?

brave solar Jun 4, 2020, 4:39 PM

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Is it not possible to bind an event dispatcher on a client from within an actor? I'm trying to bind an event dispatcher in my character blueprint when entering an actor's collision volume, and it works as it should on server, but it doesn't work at all on client. If I run the intended function directly on overlap it works, but not if I bind the event dispatcher on overlap and then call the function.

woeful jacinth Jun 4, 2020, 4:41 PM

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I am not too knowledgeable yet, but I was thinking the same thing while playing Pavlov. They have an issue with replicating objects held by other players.

#

I was thinking that you could basically not replicate the item equiped, but send a single from the server to all other clients to equip your replicated pawn with that item

novel siren Jun 4, 2020, 4:51 PM

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I have not had an issue with a repnotify before, the difference between now and before is I was not spawning the actor I was just moving it from the world to the character

twin storm Jun 4, 2020, 6:15 PM

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Can anyone tell me why when I use DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam the function that runs via AddDynamic() does not register breakpoints in visual studio? (It does run because its logging msgs to console)

#

Nevermind, switching solution config to "DebugGame Editor" instead of "DevelopGame Editor" fixed it

harsh lintel Jun 4, 2020, 7:02 PM

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The client on the left calls a server RPC that changes the client's pawn rotation but the rotation doesn't change, the client #2 on the right does see the rotation of client 1 pawn change

📎 rotatt.gif

#

Im just using SetActorRotation so idk why it doesn't work

half cradle Jun 4, 2020, 7:08 PM

#

hi, does anyone know a good tutorial on how to make ALSv4 replicatable?

light monolith Jun 4, 2020, 7:56 PM

#

📎 IMG_20200604_235546.jpg

#

How can i do this?

#

I've got a system where a host start a server and players can join put i want this kind of lobby

#

But*

bitter oriole Jun 4, 2020, 7:57 PM

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Sessions

light monolith Jun 4, 2020, 7:57 PM

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When i create a session the host doesn't join it unless i open a new level tho?

bitter oriole Jun 4, 2020, 7:58 PM

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Sessions and levels are unrelated

light monolith Jun 4, 2020, 7:59 PM

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So do i have to make the host join the session when i create it?

#

I'm using advanced sessions plugin

bitter oriole Jun 4, 2020, 8:00 PM

#

Being the host is also unrelated

#

Someone creates a session, people join it

#

Usually this is linked to levels and multiplayer, but it's fairly independent

light monolith Jun 4, 2020, 8:01 PM

#

But when i create a session and check how many players are in the session it shows me 0

bitter oriole Jun 4, 2020, 8:01 PM

#

You just need to display the players in the session before they join the same server

light monolith Jun 4, 2020, 8:01 PM

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Or does the host not count?

#

I should use Servertravel then?

bitter oriole Jun 4, 2020, 8:02 PM

#

That's a multiplayer concept

#

It's unrelated to sessions

#

Sessions, are just a way for people to share data before joining a server

#

A lobby would have players in the session, and outside the server

light monolith Jun 4, 2020, 8:04 PM

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So in the photo i just sent, they are not in the same server but in the same session?

bitter oriole Jun 4, 2020, 8:04 PM

#

No idea, just telling you how I would implement it in UE4

light monolith Jun 4, 2020, 8:04 PM

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OK thanks I'll try and miss with it

unkempt tiger Jun 4, 2020, 9:32 PM

#

anyone maybe has an idea why my TArray<FMyStruct> isn't replicating properly? While its .Num() is correct, the FMyStructs inside it contain default data (as if it was initialized by my default constructor) rather than the correct data, when sending from server to client

spark leaf Jun 4, 2020, 10:11 PM

#

Does anyone know if there are tutorials yet for the epic services p2p? I see its in beta and I want to try it out but It would be nice if there was a tutorial or sample project more than the chat program.