#multiplayer | Unreal Source | Page 471

graceful cave Jun 20, 2019, 12:01 AM

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yes

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GetGameInstance will only ever get the game instance of on the local machine running that code because thats the only game instance that exists there

harsh lintel Jun 20, 2019, 12:10 AM

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I think I'm missing something important, the dedicated server (from ue wiki) requires to pass a map/level name/path to either the name of the server executable or to the properties of the executable, which leads me to believe that what the server hosts is a single level is that right?

graceful cave Jun 20, 2019, 12:12 AM

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i havent had to do that

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if youre trying to make it start on a specific level you can just use servertravel or open

grizzled stirrup Jun 20, 2019, 12:26 AM

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Should you store an array of controllers in the GameMode, or is it more wise to just iterate using the FConstControllerIterator instead whenever you need something to happen on all connected players?

harsh lintel Jun 20, 2019, 12:33 AM

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so if I change level the dedicated server will be the same for both levels?

copper mango Jun 20, 2019, 12:51 AM

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@grizzled stirrup GameState maintains an array of all the PlayerStates, and if you're on the server you can get the controller from a PlayerState by getting the owner of the playerstate

grizzled stirrup Jun 20, 2019, 12:52 AM

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Very true! I for some reason had it in my head that I needed to store the controllers in the GM

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However ShooterGame usually does iterate over all controllers instead of get the PS array from the GS

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Are there any benefits to either approach or both are valid as usual?

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ShooterGame doesn't store them though, just iterates

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Which is much more smart than my Array approach

copper mango Jun 20, 2019, 12:54 AM

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oh yeah GetPlayerControllerIterator is good to use also, since the world maintains a list of the player controllers, so it's pretty cheap to use

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but just remember that only works on server

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since on clients they only have the player controllers for the local clients

grizzled stirrup Jun 20, 2019, 12:55 AM

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Yeah that's fine, I need it to just loop over all controllers for cases like the round ending or to activate all players and AI

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Thanks for the help!

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In cases where I need something to happen on the player, I call a client RPC on any PC's

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Like if some UI has to pop up saying ROUND LOST

fleet raven Jun 20, 2019, 12:56 AM

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that seems like a more complicated version of multicast on game state

grizzled stirrup Jun 20, 2019, 12:57 AM

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Just following a similar pattern as ShooterGame

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If theres 20 bots and 2 players it seems just as efficient

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As the bots don't need to ever get the multicast call

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For UI stuff

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Lol not that they would (waste bandwidth) being on the server

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But still

fleet raven Jun 20, 2019, 12:58 AM

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well bots don't have a copy of the game state

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that's for real clients only

grizzled stirrup Jun 20, 2019, 12:59 AM

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Oh interesting

copper mango Jun 20, 2019, 12:59 AM

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using GameState for things that change the state of the game (like the round is over or whatever) is a more correct way to do stuff like that, sometimes ShooterGame really cuts corners

grizzled stirrup Jun 20, 2019, 12:59 AM

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I thought only the PlayerState was optional but it makes sense, no need for them to have the GS

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The GameMode should always actually end the round though right, and be counting down the world time?

copper mango Jun 20, 2019, 12:59 AM

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there's basically only one GameState per process. So the server has one, and each client has one

grizzled stirrup Jun 20, 2019, 12:59 AM

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Then it can tell the GameState- hey the round is over, notify the clients

copper mango Jun 20, 2019, 12:59 AM

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yeah

grizzled stirrup Jun 20, 2019, 1:00 AM

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Ok thanks, I might try and move over that logic

copper mango Jun 20, 2019, 1:00 AM

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sometimes ShooterGame does things in a quick way, they try to balance ease of understanding with it works

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With it's correct

grizzled stirrup Jun 20, 2019, 1:02 AM

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I see, will definitely have to have another look

fleet raven Jun 20, 2019, 1:02 AM

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more importantly, shootergame was made like 6 years ago

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a lot of the ways they do things are just outdated

grizzled stirrup Jun 20, 2019, 1:02 AM

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They do everything like showing scoreboard in the GM and just update time really in the GS

fleet raven Jun 20, 2019, 1:02 AM

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like using slate ui at all

grizzled stirrup Jun 20, 2019, 1:02 AM

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Ok got to keep that in mind

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Yeah haha

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That's the most outdated part of SG

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I am using it to learn UE4 C++ though so it's tough to know what's outdated and what isn't with very few other complete examples

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Just game flow in general

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So in the case where you are iterating over all controllers n the GM to deactivate AI at the end of a round you'd still instead call a multicast RPC on the GameState to deliver the end of round status?

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Instead of a client RPC since you are already iterating over all controllers anyway?

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I've moved my Game timer from GameMode to GameState and back like 3 times, opinions are quite conflicting haha. I've settled on the actual timer going off in the GM and it telling the GS what the current time is

fleet raven Jun 20, 2019, 1:12 AM

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I'd keep track of the ais separately

grizzled stirrup Jun 20, 2019, 1:19 AM

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I'm trying to treat them all as players

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Regardless of AI or real

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So same pawn and the only difference being the controller

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So would like any events like end of round controller iterations to be as similar as possible other than in obvious cases like UI for client or activating / deactivating AI

harsh lintel Jun 20, 2019, 1:25 AM

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so from the test I just did it seems that indeed the dedicated server only hosts a single level, because the game instance doesn't keep state...

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so how do I create a server side variable (i need it to be secret) and pass it across levels?

fleet raven Jun 20, 2019, 1:32 AM

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in the game instance

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what do you mean by secret

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anything on the server that isn't replicated is "secret"

harsh lintel Jun 20, 2019, 1:42 AM

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but changing/opening to another level that isn't the one hosted by the dedicated server resets the game instance

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or at least that's what i see in my test

fleet raven Jun 20, 2019, 1:42 AM

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no it doesn't

graceful cave Jun 20, 2019, 1:55 AM

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what do you mean opening another level that isnt hosted by the dedicated server

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the server should run servertravel to make clients move with it

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if you open another level as a client then of course the server's game instance will change because the client opened up its own level and disconnected from the server

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so it becomes its own server

harsh lintel Jun 20, 2019, 1:55 AM

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im doing something wrong then

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📎 unknown.png

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i played myself

graceful cave Jun 20, 2019, 1:56 AM

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try servertravel testlevel

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also

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nothing should come after that command

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because it loads a new level

harsh lintel Jun 20, 2019, 1:58 AM

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still not werking

graceful cave Jun 20, 2019, 2:00 AM

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what would indicate "working"

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testing dedicated server stuff doesnt work in editor btw

harsh lintel Jun 20, 2019, 2:02 AM

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so I need to build in order to actually travel?

graceful cave Jun 20, 2019, 2:03 AM

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yeah

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especially if youre testing stuff with the server's game isntance

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you need to package the game and build the server

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as far as i know theres no shortcut to that

harsh lintel Jun 20, 2019, 2:14 AM

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okay ill test with a packaged version

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what I was refering to earlier is that, since Im changing level I will hold a non-replicated variable in game instance in order to pass it across levels, but since there is only one game instance on the server, and I need one of this non-replicated variable that is set at login per player I don't know how to approach that

harsh lintel Jun 20, 2019, 2:36 AM

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idk if this would work but maybe have an array of maps in the server game instance where you somehow get the index/id of the player/client and assign it as a key, and then a custom map value

real yacht Jun 20, 2019, 7:07 AM

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📎 unknown.png

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does anyone knows what is ServerMoveNoBase is?

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this is from network profiler

fossil spoke Jun 20, 2019, 7:08 AM

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Might be a function in the CMC?

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Character Movement Component.

real yacht Jun 20, 2019, 7:12 AM

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what is the best way to check that?

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this is first time that i see this

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you are right, it's in Character

copper mango Jun 20, 2019, 8:52 AM

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those are sent from the autonomous proxies to the server as part of the normal movement flow

real yacht Jun 20, 2019, 8:58 AM

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okay, so this is normal flow

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thnx for info

potent prairie Jun 20, 2019, 10:02 AM

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how do i get a bool on an AI animation blueprint to replicate to everybody else? It's only being set on the server so clients arent seeing the updated poses

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tried doing RPC's to no success

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nvm i got it. brain fart. dont replicate variabled in animbps

grizzled stirrup Jun 20, 2019, 11:31 AM

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@thin stratus sorry for the tag, you mentioned the amazing GM OptionsString property to pass rule changes in to the GM without having to store them in the GI or similar, I'm just have a slight bit of trouble understanding the difference between the key and DefaultValue in the case of setting an int.

Would the correct workflow to pass in a different MaxPlayers value be like so? In the console type open MyMapName?MaxPlayers?MaxPlayers=4 and then at StartPlay() in the GM have this line: MaxPlayers = UGameplayStatics::GetIntOption(OptionsString, "MaxPlayers", MaxPlayers);?

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Am I correct in using MaxPlayers as the "DefaultValue" argument in GetIntOption?

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It seems to work when I test it so far....

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I'm not sure how to convert a float option though, as it seems that only strings and ints have funtions in UGameplayStatics

thin stratus Jun 20, 2019, 11:34 AM

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open MyMapName?MaxPlayers=4

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You don't need UGameplayStatics::GetIntOption(OptionsString, "MaxPlayers", MaxPlayers);

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MaxPlayers is a used key word and already handled

grizzled stirrup Jun 20, 2019, 11:35 AM

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So it's set automatically with no calls at all?

thin stratus Jun 20, 2019, 11:35 AM

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It is handled in the engine

grizzled stirrup Jun 20, 2019, 11:35 AM

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Wow that's incredible!

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So I guess that means it works for floats etc automatically

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Thank you so much!

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This is a gamechanger

thin stratus Jun 20, 2019, 11:35 AM

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Only for the ones that are handled by ue4

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Your custom key words have to be handled by you

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https://github.com/EpicGames/UnrealEngine/blob/7d9919ac7bfd80b7483012eab342cb427d60e8c9/Engine/Source/Runtime/Engine/Private/GameSession.cpp#L136

grizzled stirrup Jun 20, 2019, 11:36 AM

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As in any regular properties that you define in your GM (time / score etc.) will be handled automatically?

thin stratus Jun 20, 2019, 11:36 AM

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No, MaxPlayer is

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And some others

grizzled stirrup Jun 20, 2019, 11:36 AM

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Oh that's actually a custom one in my case

thin stratus Jun 20, 2019, 11:36 AM

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If you random write "MyFreakingCoolKey"

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Then you have to handle that yourself

grizzled stirrup Jun 20, 2019, 11:36 AM

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Defines how many bots are spawnd

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So to handle yourself, what is the correct approach? Using that UGameplayStatics call?

thin stratus Jun 20, 2019, 11:36 AM

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Yes

grizzled stirrup Jun 20, 2019, 11:37 AM

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And if so, how do you get floats back if it can only return strings / int32s?

thin stratus Jun 20, 2019, 11:37 AM

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You could pass the float as a string

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And then use the String library to convert it to a float

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Or you just make sure that you always only pass ints :P

grizzled stirrup Jun 20, 2019, 11:38 AM

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I guess most things are whole numbers even if they are floats like Health

thin stratus Jun 20, 2019, 11:38 AM

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bRequireFull = UGameplayStatics::HasOption(Options, OPTION_REQUIREFULL) || bRequireFull;
bRequireReady = UGameplayStatics::HasOption(Options, OPTION_REQUIREWARMUP) || bRequireReady;
if (UGameplayStatics::HasOption(Options, OPTION_MINPLAYERSTOSTART))
{
    MinNumPlayersToStartMatch = UGameplayStatics::GetIntOption(Options, OPTION_MINPLAYERSTOSTART, MinNumPlayersToStartMatch);
}
bAllowMapVote = UGameplayStatics::HasOption(Options, OPTION_MAPVOTE) || bAllowMapVote;
if (UGameplayStatics::HasOption(Options, OPTION_OVERTIME))
{
    Overtime = UGameplayStatics::GetIntOption(Options, OPTION_OVERTIME, Overtime);
}
bTeamDamageEnabled = UGameplayStatics::HasOption(Options, OPTION_TEAMDAMAGE) || bTeamDamageEnabled;
bBalanceTeams = UGameplayStatics::HasOption(Options, OPTION_AUTOBALANCE) || bBalanceTeams;
bCanRespawnByHand = UGameplayStatics::HasOption(Options, OPTION_RESPAWNBYHAND) || bCanRespawnByHand;
bWaitBeforeRespawn = UGameplayStatics::HasOption(Options, OPTION_RESPAWNWAITTIME) || bWaitBeforeRespawn;
if (bWaitBeforeRespawn)
{
    RespawnWaitTime = UGameplayStatics::GetIntOption(Options, OPTION_RESPAWNWAITTIME, RespawnWaitTime);
}
bForceRespawn = UGameplayStatics::HasOption(Options, OPTION_FORCERESPAWNTIME) || bForceRespawn;
if (bForceRespawn)
{
    ForceRespawnTime = UGameplayStatics::GetIntOption(Options, OPTION_FORCERESPAWNTIME, ForceRespawnTime);
}
bForceWarmup = UGameplayStatics::HasOption(Options, OPTION_FORCEWARMUP) || bForceWarmup;

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Few custom examples

grizzled stirrup Jun 20, 2019, 11:38 AM

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Ahhh thank you so much

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Your snippet from last time on making your custom OptionsString was v helpful

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This is the missing step!

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Thank you

thin stratus Jun 20, 2019, 11:38 AM

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That is in GameMode::InitGame

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c++

grizzled stirrup Jun 20, 2019, 11:39 AM

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I have mine in StartPlay() but I'll probably move it to InitGame then

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This is a super useful option, makes custom games so easy 😃

thin stratus Jun 20, 2019, 11:40 AM

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Yop, requires some time to setup but then it works

grizzled stirrup Jun 20, 2019, 11:40 AM

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In the case of the capital letter properties, what are those?

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OPTIONS_MINPLAYERSTOSTART

thin stratus Jun 20, 2019, 11:42 AM

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#define OPTION_MATCHTIME FString("MatchTime")
#define OPTION_NUMTEAMS FString("NumTeams")
#define OPTION_BOTCOUNT FString("FillWithBots")
#define OPTION_BOTDIFFICULTY FString("BotDifficultyLevel")
#define OPTION_REQUIREFULL FString("ReqFull")
#define OPTION_REQUIREWARMUP FString("ReqWarmup")
[...]
#define OPTION_AUTOBALANCE FString("AutoBalance")
#define OPTION_RESPAWNBYHAND FString("RespawnByHand")
#define OPTION_RESPAWNWAITTIME FString("RespawnWait")
#define OPTION_FORCERESPAWNTIME FString("ForceRespawn")
#define OPTION_FORCEWARMUP FString("ForceWarmup")
#define OPTION_MAPCYCLE FString("MapCycle")

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Sits in our main header that holds or sorts of structs and types

grizzled stirrup Jun 20, 2019, 11:42 AM

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Ahh so you can redefine and it updates everywhere

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Got it!

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Thanks

thin stratus Jun 20, 2019, 11:43 AM

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that and you don't have typos :P

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could also make them FNames, not sure

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this works for us ¯_(ツ)_/¯

grizzled stirrup Jun 20, 2019, 11:44 AM

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Either way it's important to use the FString("thing") or FName("thing") right?

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I just used "thing" and it worked but I'm sure it's not the most correct way of doing it

thin stratus Jun 20, 2019, 11:45 AM

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a #define replaces whatever OPTION_XYSDAASD you have with whatever you write after that

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#define SEMICOLON ;

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tada

grizzled stirrup Jun 20, 2019, 11:46 AM

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Ah ok makes sense! Thanks

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Finally, to set a particular key in Options, how do you go about it?

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If you weren't going to go the route of the console command opening as I have

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?MaxPlayers=4

thin stratus Jun 20, 2019, 11:47 AM

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I thought you have the struct example?

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"Your snippet from last time on making your custom OptionsString was v helpful"

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It's always ?Key=Value or ?Key

grizzled stirrup Jun 20, 2019, 11:47 AM

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Literally just ``Options += "?" + "MaxPlayers"= "NewMaxPlayers"

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Sorry

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I will go back and find it, I had though it was more for creating the full OptionsString

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As in combining the different possible keys

thin stratus Jun 20, 2019, 11:48 AM

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My struct has a function that just formats all the parameters into a string

grizzled stirrup Jun 20, 2019, 11:48 AM

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I'll try and have a proper look to understand now, apologies!

thin stratus Jun 20, 2019, 11:48 AM

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?Key1=StringValue1?Key2?Key3?Key4=FloatValue4

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etc.

grizzled stirrup Jun 20, 2019, 11:49 AM

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Ah great yeah that makes sense! Much less scary than originally thought

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I'll probably have a nice UI that can set a few params and on hitting "Start Game" it goes through all of them and makes the string nice

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Thanks again!

thin stratus Jun 20, 2019, 11:50 AM

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e.g. if (Options.bWaitBeforeRespawnEnabled) OptionsString += "?" + OPTION_RESPAWNWAITTIME + "=" + FString::FromInt(Options.RespawnWaitTime);

grizzled stirrup Jun 20, 2019, 11:50 AM

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Ahh even better

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So I can check if it's not default

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and if not, add to the string

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Thank you for these examples

thin stratus Jun 20, 2019, 11:50 AM

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depends on your game settings of course

grizzled stirrup Jun 20, 2019, 11:50 AM

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Really helpful

thin stratus Jun 20, 2019, 11:50 AM

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anyway, g2g with doggo now

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cheers

grizzled stirrup Jun 20, 2019, 11:50 AM

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Enjoy!

meager spade Jun 20, 2019, 12:11 PM

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OptionsString += FString::Printf(TEXT("?%s=%d"), OPTION_RESPAWNWAITTIME, Options.RespawnWaitTime);would be cleaner no?

thin stratus Jun 20, 2019, 12:42 PM

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Whatever you like more ¯_(ツ)_/¯

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Most likely *OPTION_RESPAWNWAITTIME then though

plush mist Jun 20, 2019, 12:48 PM

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Hi! probably anyone can suggest me how to rotate standard character by actor with rot mov component in multiplayer without "actor like replication", I want to use default out of the box Character network functionality.

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Character is staying on the rotating platform for example

timber tree Jun 20, 2019, 1:22 PM

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Is there a way where I can gracefully shutdown my server
coz GIsRequestingExit = true; this works but its not graceful

chrome bay Jun 20, 2019, 1:31 PM

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FGenericPlatformMisc::RequestExit()

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However it does the same thing, and that is the expected way to shut things down.

bitter oriole Jun 20, 2019, 1:32 PM

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ConsoleCommand("quit") is a classic too

timber tree Jun 20, 2019, 1:38 PM

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Nice ! let me try

timber tree Jun 20, 2019, 2:29 PM

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ConsoleCommand("quit") Works better 👍

harsh lintel Jun 20, 2019, 8:20 PM

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is player state good enough for server-side non-replicated variables?

winged badger Jun 20, 2019, 8:23 PM

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why would you use playerstate for that?

harsh lintel Jun 20, 2019, 8:26 PM

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well i need this variable to relate to the player somehow

winged badger Jun 20, 2019, 8:27 PM

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controller is a more natural fit

harsh lintel Jun 20, 2019, 8:30 PM

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ill do it in pc then, why is it better there?

winged badger Jun 20, 2019, 8:30 PM

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because its not the PlayerStates purpose to hold non replicated server only variables

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its the opposite, for the most part

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so you put stuff where it belongs

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makes it easier to remember/find where it is few months down the line

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the only reason to put it in PS is if you really need it to survive a player disconnecting

harsh lintel Jun 20, 2019, 8:38 PM

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makes sense thx

grizzled stirrup Jun 20, 2019, 9:41 PM

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Regarding showing a widget on clients at key moments of a match such as at the end of a round, ShooterGame does it by looping over all player controllers and calling a Client RPC in the GameMode, but some here suggested to move this to the GameState instead. If I was to say have a replicated MatchState struct that would trigger an OnRep event when changed (such as at the end of the round), how do I go about calling the UI event only on the current player? Looping over all player controllers and checking if is local controller and calling it there?

graceful cave Jun 20, 2019, 9:42 PM

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OnRep should be enough for that

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if the newly replicated value indicates that the game is over, show the widget

grizzled stirrup Jun 20, 2019, 9:43 PM

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Yeah the tricky part is calling it only on the local human player as the gamestate OnRep doesn't have the concept of owning controller etc.

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So I'd probably just do what I did in the GM and loop over all PlayerControllers and check if it's the local one, if so call the UI function?

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I guess for a local client, he will always be the first controller, so I don't need to iterate actually

graceful cave Jun 20, 2019, 9:44 PM

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you can get the local controller for anywhere

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right

grizzled stirrup Jun 20, 2019, 9:44 PM

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I can just GetPlayerController(0) and call it

graceful cave Jun 20, 2019, 9:45 PM

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just dont do it for dedicated server

grizzled stirrup Jun 20, 2019, 9:45 PM

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Yep!

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Using listen server here

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Thanks!

onyx gale Jun 20, 2019, 11:06 PM

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Looking for a dev who can help us set up multiplayer for our FPS game

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Or at least give us some pointers

fossil spoke Jun 20, 2019, 11:08 PM

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#looking-for-talent

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#looking-for-work

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@onyx gale

lofty ravine Jun 20, 2019, 11:52 PM

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Hello, beginner question here, anyone got time to help me? 😃

fossil spoke Jun 20, 2019, 11:56 PM

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Post your question mate, someone will get to you eventually. No point asking for help, just ask the question you need help with.

lofty ravine Jun 21, 2019, 12:03 AM

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Alright sec

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📎 unknown.png

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So the most important thing of the blueprint is there i think, when my melee character makes a hit , it is a sphere trace that does damage to the enemy, and prints the damage

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but when i am playing on the client side it does no damage, and ofcourse the print string says 0 in damage

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So i would love some guidance in this, thanks regards

copper mango Jun 21, 2019, 12:22 AM

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You have to resolve damage on the server, and then the server can notify the client when there’s damage so it can show it on the UI

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You don’t want to do damage calculations on the client usually

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Because the server is authority

fleet raven Jun 21, 2019, 12:57 AM

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wtf

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📎 unknown.png

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y is it trying to write -1 bytes

copper mango Jun 21, 2019, 12:59 AM

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Did you somehow write a huge amount of data and overflowed the size?

lofty ravine Jun 21, 2019, 1:00 AM

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Yes, im aware that the server does most of the stuff, can you help me where to but the stuff so the client can see it ?

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i need a custom event with an authority switch ?

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I just don't know when to start call it ;>

fleet raven Jun 21, 2019, 1:02 AM

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but it's not overflowed, it says there's still 7KB remaining

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it just died because it tried to write -1 bytes for some reason

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oh wait.

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alright this is one confusing constructor but here it is adding the -1

📎 unknown.png

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I guess I'm sending too many reliable thingies

copper mango Jun 21, 2019, 1:46 AM

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@lofty ravine the simplest way is you make a Server reliable function, and when the client wants to attack, you call that Server function, then everything from the trace onwards is done on the server

harsh lintel Jun 21, 2019, 1:47 AM

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im calling an event defined in a widget blueprint from a client rpc defined inside the player controller blueprint, but it isn't being called

copper mango Jun 21, 2019, 1:48 AM

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you sure the client RPC is being called? and is the owner of the widget set to that player controller?

lofty ravine Jun 21, 2019, 1:49 AM

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im sorry for being slow @copper mango , but we got this working on archer , for both server and client

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📎 unknown.png

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And it all starts from oncomponenthit

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sphere

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And we don't even need authorty switches or anything

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But now on the warrior when the event starts on a keypress, it doesn't work

copper mango Jun 21, 2019, 1:50 AM

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oh, so if you're doing it off of OnComponentHit, that means it's running both on server and client

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however, if you're doing it off of a key press, that's only running on the client, since the server won't know about the key press

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but then the client can't actually resolve the damage, which is why it doesn't happen

lofty ravine Jun 21, 2019, 1:50 AM

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Ahhh, okey, an off question, how do i know what event runs on what?

harsh lintel Jun 21, 2019, 1:51 AM

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the client rpc is indeed being called from client

📎 unknown.png

copper mango Jun 21, 2019, 1:51 AM

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in Blueprint, honestly I'm not really sure if there's an easy way to know

lofty ravine Jun 21, 2019, 1:51 AM

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So i should just add an sphere on the warriors sword and start he event on an oncomponenthit and it should be solved ?

copper mango Jun 21, 2019, 1:53 AM

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if you did that then the component hit or overlap would trigger on both server and client, yes

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does get all widgets from class only show you the widgets that the player controller "owns"?

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I honestly don't know about those blueprint functions, I just nativized most of my user widget updates

harsh lintel Jun 21, 2019, 1:56 AM

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i found that the array im setting in the server isn't replicating to the client

copper mango Jun 21, 2019, 1:56 AM

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you're creating the widget on the server?

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you should only create it on client

harsh lintel Jun 21, 2019, 1:57 AM

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the widget is created on a client rpc yes

copper mango Jun 21, 2019, 1:57 AM

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so what's the array for?

harsh lintel Jun 21, 2019, 1:57 AM

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a json array, im setting it in a server rpc, and im trying to use it on the client rpc but the array is empty

copper mango Jun 21, 2019, 1:58 AM

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like you passed it as a parameter to the RPC?

harsh lintel Jun 21, 2019, 1:58 AM

#

nope, im just getting a reference to it

copper mango Jun 21, 2019, 1:59 AM

#

how do you guarantee that the JSON array is replicated before the RPC comes in?

harsh lintel Jun 21, 2019, 2:00 AM

#

thats actually a really good point xD

copper mango Jun 21, 2019, 2:00 AM

#

one thing you could do is send the JSON array in a client RPC when you set it, rather than replicating it separately as a variable

#

because it's guaranteed that if you call RPC A and then RPC B on the same object, A will execute before B

#

at least if they're reliable

#

assuming that array is changing infrequently at least, that shouldn't be a performance issue

harsh lintel Jun 21, 2019, 2:02 AM

#

let me try sending it as input first

#

genius : D

#

thanks a lot

harsh lintel Jun 21, 2019, 2:27 AM

#

hmm the array is sent with the correct number of items but the jsons are empty

fleet raven Jun 21, 2019, 2:28 AM

#

wtf

#

how is it possible for UCharacterMovement::ReplicateMoveToServer() to run for a character which fails this: check(!HasAuthority() && IsLocallyControlled());

copper mango Jun 21, 2019, 2:43 AM

#

@harsh lintel might be that JSON struct/whatever doesn’t replicate. There are some rules about what TArrays will work in an RPC

#

Basically everything needs to be a UPROPERTY or you have to override serialize I think

harsh lintel Jun 21, 2019, 3:14 AM

#

thanks, Ill just get the data as proper types and send it to the rpc

twin juniper Jun 21, 2019, 3:56 AM

#

Whats the best way to setup random character mesh spawn....i randomly select the character when the game starts in the game instance and then when the player joins the server he then spawns that randomly selected character but the problem is every ones character is the same :/

#

📎 unknown.png

#

📎 unknown.png

#

any reason why i see the same characters for everyone instead of the randomly generated characters for each client?

#

📎 unknown.png

copper mango Jun 21, 2019, 4:13 AM

#

Well game instance exists per process. So if the server game instance selects a random character, that would be used for all clients, since the server is responsible for spawning the pawns in the game mode

#

You can override SpawnDefaultPawnFor in the game mode, though I dunno about blueprints

winged badger Jun 21, 2019, 6:10 AM

#

you should definitely not use GI for choosing random characters, unless you really want the random persisting thru multiple level changes

#

that is GameMode's job

#

overriding HandleStartingNewPlayer (possibly in combination with override ChoosePlayerStart)

#

is the easiest way to make custom spawn logic from BP

worthy perch Jun 21, 2019, 9:33 AM

#

When using FFastArraySerializer, what is the equivalent of OnRep (or should I just use OnRep as I am currently doing)?
I see the PostReplicatedChange/Add stuff, but I'm not entirely sure if that's what I want.
Because, if I use PostReplicatedChange/Add, wouldn't it be hard to get a reference to the actor with the FFastArray array?

gleaming niche Jun 21, 2019, 10:13 AM

#

since you're creating the serializer in your class, you just register the actor with it

#

or whatever is using it.

#

in your custom serializer

#

and then you use the postreplicatedxxx stuff

#

as you said.

#

eg:

#

{
    //a change came through (dirty item) update displayname and stack count.
    if (InArraySerializer.Owner)
    {
        InArraySerializer.Owner->OnReplicatedItemChanged(*this);
    }
}```

worthy perch Jun 21, 2019, 10:30 AM

#

Ooooh, that makes a lot of sense. Thanks so much!

white mason Jun 21, 2019, 2:15 PM

#

📎 ue4bug.png

#

I think it's problem with a) replication b)ownership

rotund sapphire Jun 21, 2019, 2:34 PM

#

@white mason c) timing d) incomplete implementation . for instance it may work on server because all characters are always relevant, so your code works as expected, but on client they are streaming in and out, and it matters who does streaming in first (either the weapon or the character). try applying some timers/delays and make sure the character will configure the weapon and iks always, properly.

winged badger Jun 21, 2019, 3:39 PM

#

yuck @ delays for construction

#

they are never really needed

white mason Jun 21, 2019, 3:42 PM

#

@rotund sapphire If i spawn weapon some time after beginplay, everything works fine so what's the problem?

winged badger Jun 21, 2019, 3:47 PM

#

as long as weapon has SetOwner called on server when its spawned

#

and your OwnerNoSee/OnlyOwnerSee boxes are checked properly

#

(assuming here weapon itself is replicated)

#

everything works fine

magic helm Jun 21, 2019, 3:58 PM

#

Hello does anybody have experience with the replay system thats able to help me out with actually renaming a recorded replay? I found the wiki tutorial on replays which brute forces it by modifying the save file but I also found the INetworkReplayStreaming interface which has a function for renaming replays... and I cant seem to find out where to access it

#

Other than actually creating a replay streamer...

fleet raven Jun 21, 2019, 4:01 PM

#

does it generally make sense for players to be the owners of projectiles they fired?

magic helm Jun 21, 2019, 4:06 PM

#

Ah ok I found out how to access it, using the DemoNetDriver on world context objects has a shared ptr to the replay streamer so I can call those functions

rotund sapphire Jun 21, 2019, 4:11 PM

#

@winged badger i suspect the issue at @white mason is that the character will replicate first, then the weapon later, so the character cannot setup the weapon iks and the code fails somewhere down the line. Znany, just make some logs in these steps and make sure the sequence of events are in correct order, all is running. I think you will find the circumstances are invalid, and so the ik cannot be setup without the weapon being rpesent and available at the right moment. Hence, timing issue (or call it race condition maybe)

winged badger Jun 21, 2019, 4:13 PM

#

unless he really went out of his way to mess up the network, weapons spawned in same frame as the Character will come in second, as Actors take a back seat to Pawns in priority

#

so weapon will have a valid pointer to Owner by the time it calls BeginPlay on client

fleet raven Jun 21, 2019, 4:14 PM

#

it's not guaranteed though

rotund sapphire Jun 21, 2019, 4:15 PM

#

There is no guaranteed order of replication of individual actors, even if you set the ownership and priority it makes no difference, and the order will be pretty much random. With 4.20 that's what i have found at least.

fleet raven Jun 21, 2019, 4:15 PM

#

the bunch with the character could always be dropped

winged badger Jun 21, 2019, 4:15 PM

#

...

#

basically, that can never happen consistently

#

the packet getting dropped

#

and never in PIE unless you configure it to do it intentially

rotund sapphire Jun 21, 2019, 4:18 PM

#

I dont think it is getting lost, but drop, and the weapon may stream in a second later after the character - or the other way around.

winged badger Jun 21, 2019, 4:18 PM

#

not in PIE, which that almost certainly is, Robert

rotund sapphire Jun 21, 2019, 4:18 PM

#

I've added defered methods that are waiting for the weapons to arrive, then i execute the operations on them.

winged badger Jun 21, 2019, 4:19 PM

#

i spawn my weapons between my SpawnActorDeferred and FinishSpawning call for the character

#

it has never, once, failed

#

or arrived out of order

rotund sapphire Jun 21, 2019, 4:20 PM

#

It may fail once the character is coming from afar. Also don't forget to check your game with network latency, and other noisy circumstances.

winged badger Jun 21, 2019, 4:20 PM

#

like testing over internet with a failing 7 year old wireless card?

#

i do that all the time

rotund sapphire Jun 21, 2019, 4:21 PM

#

Not what i mean. Network latency, packet order errors, randomize latency and so on. You can try packet drop too if you want to torture the code an try all circumstances.

#

But anyways, i'm happy it works out for you. For many it does not, and the order of replicated actors are never guaranteed, makes any code suspectible of invalid expectations to fail eventually. Both in PIE and cooked game the circumstances are always in motion in this matter.

winged badger Jun 21, 2019, 4:23 PM

#

i have growing, altho not yet 100% confidence that this can't fail

#

my entire object graph is ready before clients call BeginPlay

#

game has been thru various network tests for over a year now, not one incident

#

with spawning weapons/characters

#

in any case, in Znany's scenario, if the mesh has the correct Owner, and its replicated by default

rotund sapphire Jun 21, 2019, 4:25 PM

#

You may be spawning the weapon on client side, manually. But if you spawn it on server, then replication will make fun of us.

winged badger Jun 21, 2019, 4:25 PM

#

it will adjust its visibility OnRep

fleet raven Jun 21, 2019, 4:25 PM

#

how'd you manage that

rotund sapphire Jun 21, 2019, 4:25 PM

#

There maybe is more to your solution which sounds intriguing actually.

fleet raven Jun 21, 2019, 4:26 PM

#

I always get characters before player/game states

winged badger Jun 21, 2019, 4:26 PM

#

i spawn nothing except target markers and such client side

#

@fleet raven assuming no packet gets lost/stuck, actors will arrive in order of NetPriority

#

Pawn and Characters have 3

#

Actors 1

rotund sapphire Jun 21, 2019, 4:27 PM

#

So that makes the character arrive before weapon, which is the problem, because character will try to run weapon setup without the weapon actor available at that frame.

#

Not sure how'd you throttling the character beginplay to wait for the weapon actor to arrive, it may take a second actually.

fleet raven Jun 21, 2019, 4:27 PM

#

is it actually necessary to receive characters and weapons in the same frame tho

winged badger Jun 21, 2019, 4:27 PM

#

that assumes i have to do more then bind delegates inside OnRep_Owner

fleet raven Jun 21, 2019, 4:28 PM

#

well I guess my order being wrong all the time is far better than it not doing that in the long run

#

because otherwise I wouldn't take care of it and it would randomly crash clients on bad connections

winged badger Jun 21, 2019, 4:30 PM

#

i don't really care if Character BeginPlay runs before the weapon arrives

#

it just needs the controller already there to work

#

same as weapons just need a valid poitner in onrep_owner to work

#

one rule i didn't break, never put yourself in situation where a replicated actor has more then 1 actor its dependant upon already there client side to work

rotund sapphire Jun 21, 2019, 4:34 PM

#

I'm sure it's avoidable tho the solution might gets too troublesome to maintain.

winged badger Jun 21, 2019, 4:34 PM

#

except for if dependancy is loaded from a package, then you just don't care

rotund sapphire Jun 21, 2019, 4:34 PM

#

Timing issue however is something you can treat, it just messy a bit.

slender yarrow Jun 21, 2019, 4:50 PM

#

does anyone know of any more detailed guides/information on remote dedicated server networking? Im at the point in the known wiki tutorial on dedicated servers, where I have just typed in my public IP to the travel map BP, but other computers are not able to successfully connect to the server and travel to the playable map. Ive seen this asked on the answerhub and forums but no real solid answers.

rotund sapphire Jun 21, 2019, 4:51 PM

#

Open a port on your router so outsiders can connect to your locally run server

slender yarrow Jun 21, 2019, 4:56 PM

#

well i did port foward on 7777. But im running the server on 1 computer in my house and trying to play on another. Does this not work if the computers are on the same network?

#

I guess i need to try and connect from another network to really know its not working 😑

rotund sapphire Jun 21, 2019, 5:04 PM

#

If you're using null oss then it should work. Since you're running it locally you can connect to your server using the lan ip, outsiders must use your external ip however

#

You should be able to connect to your own server using the external ip too

#

Also check on firewall settings and make sure it is not limiting the process to interact with the internet in any way

#

There also is one more awkward circumstance when your network is behind multiple NAT, in which case only steam will work. Alternatively you can just upload your server to the cloud and get it shared that way - it's the preferred way actually

slender yarrow Jun 21, 2019, 5:13 PM

#

yeah i want to do that eventually but im just testing it right now

#

i just want to see a client connect

#

thats all i need

rotund sapphire Jun 21, 2019, 5:15 PM

#

then just connect your own client to your local ip of your server and it should work - if everything is good with your cooked game and server

#

logs can tell you if something is broken and the client gets dropped or something

slender yarrow Jun 21, 2019, 5:17 PM

#

well problem is, I have my public IP baked into the entry level bp. Begin Play -> Open Level (public IP), and the game is packaged.

#

Ive seen it work already using my local ip

rotund sapphire Jun 21, 2019, 5:22 PM

#

That's not a problem :) The problem is that it is not connecting for others, but like i said it is possible your ISP is using additional layers of NAT so you wont be able to host p2p games for others. Just upload your server to the cloud it should work. On amazon you can get tiny instances for free for a year, that's a good place to test things i guess.

slender yarrow Jun 21, 2019, 5:23 PM

#

Ok ill give it a try. Thanks for the advice

civic light Jun 21, 2019, 8:27 PM

#

Is it possible (without using a custom engine build) to load a random map that isn't the GameDefaultMap when disconnected from a server?

#

bind to the server error delegate and call UGameMapsSettings::SetGameDefaultMap(MapString);?

twin juniper Jun 21, 2019, 9:51 PM

#

@copper mango i tried what you metioned but no luck

#

📎 unknown.png

#

the random character selected

cerulean escarp Jun 21, 2019, 10:10 PM

#

so I'm trying to get my shooting working so clients can actually aim, but I don't know how to have the server see that a client is aiming X degrees up/down, so when I shoot from a client the line trace just goes directly forward out of the client even when aiming up or down, also the server player can shoot in any direction and it works as intended

#

this is my weapon BP (yes I know the line trace shouldn't be in there please don't murder me for improper organization):
https://i.imgur.com/m5qifJo.png

Imgur

#

also when I shoot, the client sees the correct bullet impact location with the added straight ahead one, but the server only sees the straight ahead one

#

here's an example of in game, the client is on the right the server is on the left:
https://i.imgur.com/uugY836.jpg

Imgur

copper mango Jun 21, 2019, 10:21 PM

#

I believe if you use GetPlayerViewPoint on the player controller, that is replicated client to server

cerulean escarp Jun 21, 2019, 10:23 PM

#

I couldn't find that function

copper mango Jun 21, 2019, 11:16 PM

#

@cerulean escarp hmm in BP it might be this one

#

https://api.unrealengine.com/INT/BlueprintAPI/Actor/GetActorEyesViewPoint/index.html

Get Actor Eyes View Point

cerulean escarp Jun 21, 2019, 11:16 PM

#

ah let me see if that's it

#

it worked! thank you

#

stupid though that it wouldn't work with the camera's rotation

copper mango Jun 21, 2019, 11:21 PM

#

reason is just the camera isn't replicated at all, but that separate actor view thing is

#

because like the server doesn't really need to know about almost anything camera-related, so it'd be a waste of bandwidth to replicate it

graceful cave Jun 22, 2019, 12:48 AM

#

i have a menu ingame to allow admins to configure server settings which are all part of one struct

#

it keeps track of settings that were changed so only those need to be sent instead of all of the settings

#

is there a way to send only specific data in a struct in an RPC to reduce the size of the data thats sent to the server

#

or do i need to have a separate RPC for each setting

#

using cpp

meager spade Jun 22, 2019, 1:29 AM

#

use a struct

#

and replicate only whats changed

graceful cave Jun 22, 2019, 2:00 AM

#

this is client to server so theres no replication

#

only RPC

meager spade Jun 22, 2019, 2:01 AM

#

yeah then its up to you how you handle the rpc

#

i wouldnt have a rpc for each value, i would just be sending a struct, its not like your sending the rpcs all the time

#

so why be concerned?

graceful cave Jun 22, 2019, 2:02 AM

#

i havent checked the actual size but its decently large

#

not that its anything significant

#

more so just wondering if i can optimize sending it

ebon nimbus Jun 22, 2019, 2:09 AM

#

Hey all! Having an issues with a shield spawning in 2 different locations. Here is the spawn code:

#

https://gyazo.com/c46644be89ccccc99471b7b656ddc7d6

Gyazo

#

Currently im getting one spawning on the arm in the correct location and another spawning way off to the size but rotating with the player pawn when i move. I honestly get the feeling im messing up something fundamental as even the projectile im throwing around had issues with hitting itself(or a duplicate)

graceful cave Jun 22, 2019, 2:11 AM

#

is the actor set to replicate? spawning it in a multicast would mean the clients are spawning one as well as spawning the server's

ebon nimbus Jun 22, 2019, 2:11 AM

#

yes its set to replicate, does doing that along with the multicast cause the duplication?

graceful cave Jun 22, 2019, 2:12 AM

#

yes because replicated actors spawned serverside will spawn for clients

#

so they're spawning the one that's being attached locally and then getting the server's actor that isn't attaching to anything

ebon nimbus Jun 22, 2019, 2:13 AM

#

ah that makes all the sense

#

i was thinking of the replication setting as a requirement for it to be multicasted. Thanks for the clarification!

graceful cave Jun 22, 2019, 2:14 AM

#

the actor that spawnactor is being called on needs to be replicated in order to call RPCs

#

but spawning actors through multicast is bad compared to just having the server spawn it

#

try that and then call the attach on beginplay

#

that comes with the benefit of newly joining clients spawning the actor and attaching it too

ebon nimbus Jun 22, 2019, 2:16 AM

#

Do you mean the actor in which the SpawnActor resides or the class type specified in SpawnActor?

graceful cave Jun 22, 2019, 2:16 AM

#

the actor spawning the actor needs to replicate for an rpc to work

ebon nimbus Jun 22, 2019, 2:17 AM

#

makes sense

graceful cave Jun 22, 2019, 2:17 AM

#

but instead just replicate the shield actor and spawn it on server only

#

that will spawn it for everyone

ebon nimbus Jun 22, 2019, 2:19 AM

#

Thanks again for the clarification, it really helps! Right now everything is working as intended so im going to go mess some more stuff up!

elfin veldt Jun 22, 2019, 4:27 AM

#

I need a little help with this, I'm trying to get a lock-on system that functions regardless of which player you are, but currently it only locks on to player 2's spawn point. doesn't follow them even if they move, not to mention this is also true for player 2.

📎 unknown.png

#

📎 unknown.png

#

Any ideas?

copper mango Jun 22, 2019, 4:57 AM

#

@elfin veldt Get Player Pawn doesn't get the player from the PlayerState...it gets the one assigned to the player controller index you pass in

#

if you're wanting the pawn associated with a PlayerState, I think in Blueprint you just access the PawnPrivate variable off of the player state

elfin veldt Jun 22, 2019, 5:27 AM

#

@copper mango what is Pawn Private exactly? nothing seems to have changed though likely because I'm dense.

📎 unknown.png

copper mango Jun 22, 2019, 5:41 AM

#

it's the pawn associated with that playerstate

elfin veldt Jun 22, 2019, 5:42 AM

#

how would I get the pawn for both players?

copper mango Jun 22, 2019, 5:43 AM

#

how do you want your lock on to work? like you press a button then what happens?

elfin veldt Jun 22, 2019, 5:44 AM

#

end goal is pretty much make the camera look at the other player.

#

somehow It's focused on the world origin at the moment

#

so no matter where I move player 1 or player two, they both look there.

copper mango Jun 22, 2019, 5:48 AM

#

what's the intent of your SetPlayerPawn function?

#

like right now, for each player state you're setting the associated pawn's target location as its own location

#

I don't think what's what you want

elfin veldt Jun 22, 2019, 5:49 AM

#

I'm sure it isn't, I'm just unsure of how to actually do it.

copper mango Jun 22, 2019, 5:50 AM

#

so to get Player A to constantly look at Player B, you want to just save Player B and then in tick or whatever you need to update your facing to look at the new Player B position

#

you have to update it every frame since the player might move

elfin veldt Jun 22, 2019, 5:51 AM

#

but how do I decide player a and player b

copper mango Jun 22, 2019, 5:53 AM

#

well your InputAction Lock On or whatever is in your controller, yeah? so inside the controller you can use Get Pawn to get the Pawn associated with that player, and that's player A

#

for player B it depends on how you want to figure that out, like if you know it's only ever two players, then you know the player that's not player A is the one you want...if there's more than that then you'll have to decide however you want to

#

but I honestly don't really do blueprint stuff at all, so I couldn't tell you like which specific nodes and all that to use

#

you might have better luck with the folks in #blueprint

ember needle Jun 22, 2019, 9:03 AM

#

All, I'm experiencing something unexpected. I've got a player who controls a character (military). At a given point, this player possesses a Drone, so unpossessing the character.

If the possess happens when the character is moving, GetVelocity in the character's animBP returns the speed that the character had (so > 0) despite the fact that the character is not moving, so this happens:
https://gyazo.com/b9010bcdb689f12250e3da5177177ae4

Gyazo

▶ Play video

#

What you see printed there comes from the animBP:

📎 d36ca8e5c963857d754338173c62c75c.png

#

but as you can see the character is not moving.

ember needle Jun 22, 2019, 9:26 AM

#

In MP this is pretty clear:
https://www.youtube.com/watch?v=R58rObo1VT4

YouTube

Misultin Games

Possess BUG in UE4

▶ Play video

twin juniper Jun 22, 2019, 9:37 AM

#

How in CPP replicate override void from interface?

    virtual void InteractWithObject_Implementation() override;``` I need to create 2 functions in interface like this? (above)
```void InteractWithObject();
bool InteractWithObject_Validate();```

winged badger Jun 22, 2019, 9:55 AM

#

Not sure unreal will like mixing interfaces and rpcs

#

And its a dodgy idea to start with, as implementing an unterface doesnt mean the actor has a data channel to sent the rpc through

twin juniper Jun 22, 2019, 9:57 AM

#

Shiet, I need use rpc to interact with objects like lamps or gate switch

meager spade Jun 22, 2019, 11:49 AM

#

when you interat

#

interact

#

simply in your Interact implementation send a RPC

#

for that object

#

as long as the object is net name stable and has a owner it will have a data channel

left atlas Jun 22, 2019, 12:14 PM

#

I'm looking for recommendations and opinions for distributing a multiplayer closed, small-scale multiplayer alpha. The game will likely not be released on Steam, but I do have unused game spots available there and I'm not adverse to using it for testing. I need to be able to distribute, update, and allow clients to find and connect to non-dedicated sessions using some sort of existing friend/player system (i.e. Steam, EOS, or other). I'd prefer to use EOS since if the game is released to PC I would likely target the Epic store but I'm not sure what state that is in and how I could distribute the game during closed alpha/beta if using it.

#

I'm also not adverse to using an online system for testing that would not be used at release.

winged badger Jun 22, 2019, 2:29 PM

#

sounds like you need a solution which is primarily not time consuming

#

steam can do that, using something like advanced sessions you can get basic functionality working inside a day

#

provided you are somewhat familiar with how it works

twin juniper Jun 22, 2019, 3:19 PM

#

{
    GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("Called lamp on off!"));

    if (PointLight->IsVisible())
    {
        PointLight->SetVisibility(false);
    }
    else
    {
        PointLight->SetVisibility(true);
    }
}```ScreenDebug works on server and client but why `SetVisibility` works only on server?

meager spade Jun 22, 2019, 3:24 PM

#

it doesnt

#

you have to multicast it

#

but i wouldnt do that

#

i would use a replicated bool you set like UPROPERTY(ReplicatedUsing = OnRep_LampOff) bool bLampOff;

#

then void AWallLamp::OnRep_LampOff() { PointLight->SetVisibility(!bLampOff); }

#

then in your server rpc

#

you do:

#

{
    GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("Called lamp on off!"));
    bLampOff = !bLampOff;
}```

#

this will create a togglable lamp

#

and using OnRep will ensure new clients or clients who came into relevancy of the lamp will see the correct state

twin juniper Jun 22, 2019, 3:34 PM

#

I will try this @meager spade. But I need declare void OnRep_LampOff, yes?

meager spade Jun 22, 2019, 3:37 PM

#

yeah

#

and you need to replicate bLampOff via GetLifetimeReplicatedProps

twin juniper Jun 22, 2019, 3:38 PM

#

Thanks for tips 😃

meager spade Jun 22, 2019, 3:38 PM

#

{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(AWallLamp, bLampOff );
}```

#

dont need to declare that in header file

#

and you need #include "UnrealNetwork.h" in your cpp file

#

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

Property Replication

Detailed information about how Actor properties are replicated.

twilit swift Jun 22, 2019, 4:01 PM

#

Hey All, I'm making a force field actor that has health and can be destroyed by projectile hits. When I run a dedicated server the hits don't seem to register and the actor doesn't get destroyed. Also, the particles don't get spawned on all clients. What am I missing here?

📎 unknown.png

#

📎 FF_Hit2.PNG

#

📎 unknown.png

#

I thought maybe I forgot to set a component to replicated, but I just double checked and all actors/components involved in this mechanic are set to replicate.

twilit swift Jun 22, 2019, 4:37 PM

#

to be clear, the process works as expected when I'm the server. Just not when I tick 'run dedicated server'

meager spade Jun 22, 2019, 4:57 PM

#

i know in c++ servers dont call OnRep themselves

#

and you have to manually call it

#

but what is not working?

#

the overlap detection?

#

only thing i can think of is your projectile on server is not going where you think it is

#

might need to debug where your server thinks the projectile is

small compass Jun 22, 2019, 6:34 PM

#

Does anyone have any experience with the Event CopyProperties in the PlayerState?
I'm trying to keep player state values after changing a level in multiplayer.

#

theres almost no documentation nor cases online. tried to find everywhere

#

would this be a good way of keeping player state properties upon level change or are there better ways?

#

📎 unknown.png

meager spade Jun 22, 2019, 7:01 PM

#

its the only way really

small compass Jun 22, 2019, 7:01 PM

#

what is?

meager spade Jun 22, 2019, 7:01 PM

#

CopyProperties

small compass Jun 22, 2019, 7:01 PM

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how do i use it?

meager spade Jun 22, 2019, 7:01 PM

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NewPlayerState is the new player state

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so you just set the properties on it

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from your current playerstate

small compass Jun 22, 2019, 7:02 PM

#

📎 unknown.png

meager spade Jun 22, 2019, 7:02 PM

#

yeah

small compass Jun 22, 2019, 7:02 PM

#

thats what i tried

#

i set all gamemodes to seamless travel aswell

meager spade Jun 22, 2019, 7:03 PM

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mind you i never done that in bp

#

i did it in c++, but it should be the exact same

#

does it hut

#

hit*

small compass Jun 22, 2019, 7:03 PM

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when i put a print there, it doesnt get called

meager spade Jun 22, 2019, 7:03 PM

#

then your playerstate is not persisting

#

well

#

its not being copied

small compass Jun 22, 2019, 7:04 PM

#

where should CopyProperties be called from?

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because i'm indeed not calling it

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before/after i level change?

meager spade Jun 22, 2019, 7:05 PM

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its called automatically

small compass Jun 22, 2019, 7:05 PM

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thats what i assumed

meager spade Jun 22, 2019, 7:06 PM

#

so in code

#

{
    DispatchCopyProperties(NewPlayerState);
    NewPlayerState->bOnlySpectator = bOnlySpectator;
}```

#

when player seamless travels, it dispatches CopyProperties

#

which in turn calls CopyProperties

#

and its called here

#

OldPlayerState->SeamlessTravelTo(C->PlayerState); inside AGameMode::HandleSeamlessTravelPlayer

#

so as long as you are Seamless travelling

#

the properties will be copied

scarlet osprey Jun 22, 2019, 7:08 PM

#

@small compass Multiplayer Network Compendium by Cedric is a good read for that. It helped me a lot. Thanks Cedric! Pdf download here: http://cedric-neukirchen.net Examples in blueprints and c++

Cedric Neukirchen

eXi

Home Page

small compass Jun 22, 2019, 7:10 PM

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i'm currently not using ANY c++ in my project. but i will definitely bookmark your message @meager spade

meager spade Jun 22, 2019, 7:10 PM

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im just showing that its called when seamless travel happens

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so your bp CopyProperties will only fire if you are seamless traveling

small compass Jun 22, 2019, 7:11 PM

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yeah im trying to compare my bps with your c++ to find resemblances

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and @scarlet osprey thx for the pdf :)

scarlet osprey Jun 22, 2019, 7:13 PM

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@small compass 👍the author is also frequently in this channel.

small compass Jun 22, 2019, 7:37 PM

#

this prints the name correctly. right before it joins the session:

#

📎 unknown.png

#

but i change the controller class on level change aswell

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the menu, lobby and game have a seperate player controller

#

could that be a problem?

#

@meager spade

small compass Jun 22, 2019, 8:03 PM

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@thin stratus is it possible to have a persistent playerstate without using c++ when changing a level in multiplayer?

thin stratus Jun 22, 2019, 8:04 PM

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Well yeah

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Mark the GameMode Seamless

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It's not 100% persistent

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But it gives you the option to pass over data with CopyProperties

small compass Jun 22, 2019, 8:05 PM

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exactly thats what i did

#

but no success

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but the CopyProperties does not get called

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i'm also switching gamemodes, is that a problem?

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i have a MenuGameMode and a MenuPlayerController, then i enter the lobby and i use a LobbyGameMode and a LobbyPlayerController

rotund sapphire Jun 22, 2019, 8:11 PM

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Valandril the playerstate is tied to the controller, once you get rid of the controller the state will be eaten up by the gc i think. So that maybe one reason the copy never gets called. Not sure tho.

small compass Jun 22, 2019, 8:14 PM

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all i want is to keep the name a player filled in in the main menu when he is joining a session to persist.
Should i be doing this in a different way overall?

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like maybe a savegame?

meager spade Jun 22, 2019, 8:16 PM

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PlayerState has a name property by default

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which is pulled from the OSS, or a custom one can be provided

small compass Jun 22, 2019, 8:19 PM

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yeah i noticed that it had it by default, i simply wanted to add a "points" variable

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every game mode uses the custom one

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(i started with ue4 3 weeks ago and trying to score an internship)

twin juniper Jun 22, 2019, 8:20 PM

#

Good day everyone. I red some documents about multiplayer, but still don't know in how can I connect to other person through IP or Steam. Anybody can help me with this by providing an example or by showing how to do it?

small compass Jun 22, 2019, 8:21 PM

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https://www.youtube.com/watch?v=abmzWUWxy1U&list=PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ&index=1

YouTube

Unreal Engine

Blueprint Multiplayer: Project Overview | 01 | v4.11 Tutorial Seri...

In this video we take a look at the finished project and step through each of the features that will be covered in this series. We show our functional Main M...

▶ Play video

#

this guide has steam implementation

#

from epic games themselves

twin juniper Jun 22, 2019, 8:24 PM

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Valandril Thanks. I already saw it. Will try to understand again

small compass Jun 22, 2019, 8:27 PM

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@rotund sapphire i checked and the player ID in the player State class is different

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before changing level it was 499, afterwards it was 500

twin juniper Jun 22, 2019, 9:32 PM

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can someone help me with setting mesh with networking?

#

im trying to set random character models

dark edge Jun 22, 2019, 9:33 PM

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@twin juniper do you have component replicates checked?

twin juniper Jun 22, 2019, 9:34 PM

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no will try one moment

#

@dark edge can i pm you?

#

Still no luck

dark edge Jun 22, 2019, 9:48 PM

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Sure

meager spade Jun 22, 2019, 10:05 PM

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you need to multicast

#

or set the mesh via onrep

#

mesh changes are not replicated

worthy perch Jun 22, 2019, 11:11 PM

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This is weird. Does a Character's Mesh have to be near the center of the root capsule (in terms of XY) for net rotation smoothing to work?
If I move out from the center (~>10uu), there is a strange out of jittering that I couldn't really get rid of.

twin juniper Jun 23, 2019, 6:56 AM

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got it all figured out

#

by any chance anyone have any good footstep sounds for outside like grass/dirt/sand/ anything around that nature?

hollow lance Jun 23, 2019, 11:14 AM

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Hi all, can UObject be replicated as an UPROPERTY?

#

the simulated proxy version on clients always get my UObject replicated PROPERTY equals NULL when I debug into OnRep_UobjectVar

#

I did set up ReplicateSubobjects function

winged badger Jun 23, 2019, 11:16 AM

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you want to replicate a reference to it, or the object itself?

hollow lance Jun 23, 2019, 11:17 AM

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the object itself, I'm using it for some data that needs to be sync across clients

winged badger Jun 23, 2019, 11:19 AM

#

did you override IsSupportedForNEtworking in the UObject class?

hollow lance Jun 23, 2019, 11:20 AM

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Yes, I did

winged badger Jun 23, 2019, 11:22 AM

#

they can be replicated, and you have to keep a pointer to them in an UPROPERTY marked variable, otherwise GC will clean them up

#

most common use case would be UPROPERTY(Replicated or ReplicatedUsing)

hollow lance Jun 23, 2019, 11:23 AM

#

📎 unknown.png

#

Yes I do have that

#

I've tried basically everything I found on Google, not sure if I missed something 😄

winged badger Jun 23, 2019, 11:23 AM

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show me the ReplicateSubobjects function?

hollow lance Jun 23, 2019, 11:23 AM

#

📎 unknown.png

#

sure

winged badger Jun 23, 2019, 11:24 AM

#

thats ok

#

since OnRep fires, you're not missing a DOREPLIFETIME either

hollow lance Jun 23, 2019, 11:26 AM

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that's right, I did set up my DOREPLIFETIME macro

winged badger Jun 23, 2019, 11:31 AM

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and your IsSupportedForNetworking implementation in USlotHandlerObject?

hollow lance Jun 23, 2019, 11:31 AM

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yes

winged badger Jun 23, 2019, 11:31 AM

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i mean what is it? just return true;

hollow lance Jun 23, 2019, 11:31 AM

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📎 unknown.png

#

just return true, indeed

winged badger Jun 23, 2019, 11:32 AM

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it should work then

hollow lance Jun 23, 2019, 11:32 AM

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yeah I know right

#

it's driving me crazy xD

winged badger Jun 23, 2019, 11:33 AM

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there are few more functions i implemented, like GetFunctionCallspace and CallRemoteFunction

#

but those are required only if you're going to send the RPCs through it

hollow lance Jun 23, 2019, 11:33 AM

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hmm

#

not sure if there is anything wrong with the actor contains the object

winged badger Jun 23, 2019, 11:34 AM

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there is a possibility that it does work, but there is a bug in your test scenario

hollow lance Jun 23, 2019, 11:34 AM

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the idea is to have those actors exist on the server, and have their "mirror" on clients

#

one of the example I've read has the UObject initialized only on server, with checking on HasAuthority

#

but in my case it still fails, as OnRep still delivers NULL value

winged badger Jun 23, 2019, 11:37 AM

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so you do SlotStateHandler = NewObject<USlotHandlerObject>(this); from ASlotActor on server at what point?

hollow lance Jun 23, 2019, 11:38 AM

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I set it in ASlotActor::BeginPlay()

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(without any checking on HasAuthority)

winged badger Jun 23, 2019, 11:38 AM

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should be from Authority

#

but the OnRep_ should still fire before BeginPlay client side

hollow lance Jun 23, 2019, 11:39 AM

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yes, I understand the HasAuthority part, but the OnRep_ is still unexplanable for me

winged badger Jun 23, 2019, 11:39 AM

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without authority clients will overwrite the received object with newly created local one

#

that won't have a matching NetGuid

#

you put a breakpoint into OnRep_SlotStateHandler?

hollow lance Jun 23, 2019, 11:43 AM

#

📎 unknown.png

#

yes, I put it here

winged badger Jun 23, 2019, 11:49 AM

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and the object is valid on server when BeginPlay is done?

hollow lance Jun 23, 2019, 11:49 AM

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yes

#

I debugged in the BeginPlay function as well, and all a server and two clients have the valid value of the object

#

(currently without HasAuthority checking, if with, then the game can't survive more than one tick, when one of my client Tick function accesses the status of the variable)

winged badger Jun 23, 2019, 11:52 AM

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and the SlotActor itself is spawned at runtime or loaded from package?

hollow lance Jun 23, 2019, 11:54 AM

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it is spawned at runtime

#

it is server-sided actor

#

📎 unknown.png

#

this function is a RPC, server only, and called from authored client owning the player

#

📎 unknown.png

#

this is its signature

winged badger Jun 23, 2019, 11:56 AM

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slot actor class is a BP class?

hollow lance Jun 23, 2019, 11:56 AM

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yes it is

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I made ASlotActor in C++ and another derived in BP (for visual stuff)

winged badger Jun 23, 2019, 11:57 AM

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try overriding ASlotActor and USlotHandlerObject::PreReplication

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also, implementing USlotHandlerObject::GetWorld

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my scenario is more complex then this, but it just works

hollow lance Jun 23, 2019, 11:58 AM

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what should I fill into these function?

winged badger Jun 23, 2019, 11:59 AM

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void UAttributeComponent::PreReplication(IRepChangedPropertyTracker & ChangedPropertyTracker)
{
    Super::PreReplication(ChangedPropertyTracker);

    for (USolsticeBuffBase* Buff : ReplicatedBuffs)
    {
        if (IsValid(Buff) && IsValid(GetOwner()))
        {
            Buff->PreReplication(ChangedPropertyTracker);
        }
    }
}

#

that is mine, mind that i am creating and replicating SubObjects from an ActorComponent

#

not Actor

#

so yours in Actor should just call Super, check the pointer for null and call PreReplication

hollow lance Jun 23, 2019, 12:01 PM

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it seems to me that UObject does not have any PreReplication

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should I make a new function?

winged badger Jun 23, 2019, 12:01 PM

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    UBlueprintGeneratedClass* BPClass = Cast<UBlueprintGeneratedClass>(GetClass());
    if (BPClass != NULL)
    {
        BPClass->InstancePreReplication(this, ChangedPropertyTracker);
    }

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this is mine

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the body of it

hollow lance Jun 23, 2019, 12:02 PM

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hmm, I have no such thing for overriding

winged badger Jun 23, 2019, 12:02 PM

#

mine apparently isn't an override either, sorry

#

i did go through UActorComponent source code to see what they did to make it replicate, as it is also a UObject

hollow lance Jun 23, 2019, 12:03 PM

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yeah, so it seems that it's not so applicable in my case 😦

winged badger Jun 23, 2019, 12:04 PM

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both of these are longshots

#

but i don't really see anything wrong with your code

#

and my UObjects replicate just fine

hollow lance Jun 23, 2019, 12:05 PM

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yes, that's why I can't find any solution online xD

#

tried every fucking way, haha

winged badger Jun 23, 2019, 12:06 PM

#

your case is simpler because you are not creating and replicating objects in a component

#

i do have a nasty engine caveat to deal with because of this

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(when my object replicates, its outer gets ninjaed so its no longer the component, but the actor owner)

hollow lance Jun 23, 2019, 12:08 PM

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yes, this is just a demo for learning purpose

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not anything super complex

winged badger Jun 23, 2019, 12:09 PM

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does it have GetWorld?

hollow lance Jun 23, 2019, 12:10 PM

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what do you mean by it?

winged badger Jun 23, 2019, 12:10 PM

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the USlotStateHandler?

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virtual UWorld* GetWorld() const override

hollow lance Jun 23, 2019, 12:11 PM

#

📎 unknown.png

#

yes it does have

winged badger Jun 23, 2019, 12:11 PM

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that is UObject function, did you override it?

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i do override it on all my UObject derived classes automatically

hollow lance Jun 23, 2019, 12:12 PM

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no, I didn't overide it

winged badger Jun 23, 2019, 12:12 PM

#

so i don't actually know if my UObjects would replicate without it

#

i assume they would

#

but can't say i am sure

hollow lance Jun 23, 2019, 12:13 PM

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hmm, let me try it

#

but how can you fetch the World pointer? (beginner question)

winged badger Jun 23, 2019, 12:15 PM

#

if (HasAnyFlags(RF_ClassDefaultObject))
{
    return nullptr;
}
return GetOuter() ? GetOuter()->GetWorld() : nullptr;

#

first part is because GetOuter()->GetWorld() is kinda undefined in the editor on the CDO

#

when you right click on event graph for context

#

it calls GetWorld()

#

and if it gets something it understands, even a nullptr

#

it lets you use functions that require a world context to work

hollow lance Jun 23, 2019, 12:17 PM

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doesn't work though 😦

#

I'm gonna head off for dinner and get back later

#

thanks for your support anyways, @winged badger

twin juniper Jun 23, 2019, 12:20 PM

#

📎 Screenshot_2.png

#

bro networking is so frustrating

winged badger Jun 23, 2019, 12:23 PM

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never call a reliable RPC on Tick

#

which you are doing assuming 60 FPS

twin juniper Jun 23, 2019, 12:23 PM

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yes what

#

i wait for the tick in order to recheck if it can jump

#

so it doesnt call

#

retriggerable delay

winged badger Jun 23, 2019, 12:26 PM

#

you just need to replicate the user input

#

as in

#

is the jump button pressed or not

twin juniper Jun 23, 2019, 12:26 PM

#

yeah i do that too

#

it doesnt send constant updates

winged badger Jun 23, 2019, 12:26 PM

#

that sets your IsJumping flag

twin juniper Jun 23, 2019, 12:27 PM

#

i do that too my guy

#

before calling in the notify

winged badger Jun 23, 2019, 12:27 PM

#

you also make a setter function for CanJump

twin juniper Jun 23, 2019, 12:27 PM

#

yes

#

already did that

#

the networking is the problem in my case

winged badger Jun 23, 2019, 12:27 PM

#

that sets IsJumping to false if its false

twin juniper Jun 23, 2019, 12:27 PM

#

its frustrating for me

winged badger Jun 23, 2019, 12:27 PM

#

and you simulate the rest

#

server doesn't really need to know anything except if the player is trying to jump

#

it knows the rules of jumping

twin juniper Jun 23, 2019, 12:29 PM

#

i do it with impulse

#

the jumping

#

u can see it on the screenshot

winged badger Jun 23, 2019, 12:29 PM

#

so it can figure the rest out without getting in more RPCs

twin juniper Jun 23, 2019, 12:29 PM

#

the server gets one call everytime i jump

#

cause i set it that way

#

what u dont understand

#

not when i trigger jump

#

not when is jumping

#

one when i jump

#

I don't need help with functions,thats why im in multiplayer,i need help with networking

twin juniper Jun 23, 2019, 1:20 PM

#

📎 Screenshot_3.png

meager spade Jun 23, 2019, 2:12 PM

#

your setup is all wrong

#

saying that, handling custom jumps in blueprint is a nightmare

#

you really need to handle it in the cmc

twin juniper Jun 23, 2019, 2:33 PM

#

the impulse is from the character movement

#

I just replicate it

meager spade Jun 23, 2019, 2:34 PM

#

yeah so what issue you having?

twin juniper Jun 23, 2019, 2:34 PM

#

Nothing now

#

I just wanted some help in networking it

meager spade Jun 23, 2019, 2:35 PM

#

i presonally dislike multicasting things like that

#

i would handle it inside the cmc via a custom movement

#

but you need to do that in c++

twin juniper Jun 23, 2019, 2:35 PM

#

I never cared for c++

#

So being that far up in the project,starting to learn c++ while I can do it in bp will set up back a lot

meager spade Jun 23, 2019, 2:36 PM

#

all client does is send in he his custom jumping, cmc handles it and replicates it to other clients via the movememnt

#

yeah, but you will hit many brick walls in blueprint, especially on a big game

twin juniper Jun 23, 2019, 2:37 PM

#

Yeah I have noticed some

meager spade Jun 23, 2019, 2:37 PM

#

but then again i find blueprints messy and disorganized, i use them only for a few nodes. then again i can do stuff just as quick in c++ as i can in blueprint

#

but if you never need to use c++ stuff, then its fine, there are many little games out there wrote purely in bp

#

but the bigger games would be crawling if they did it all in bp

chrome bay Jun 23, 2019, 2:40 PM

#

You'll hit multiple brick walls trying to do multiplayer in BP-only. Certainly if you want to modify character movement anyway. Some stuff is just off limits.

#

Just be sure to test with a real-world connection scenario. Don't assume it'll work unless it does so outside the editor with some lag and packet loss introduced.

spare glade Jun 23, 2019, 3:37 PM

#

For some reason when any player leaves the dedicated server instance the server instantly hits array out of bounds, after adding them to the inactive list it seems

#

then crashes

#

📎 unknown.png

spare glade Jun 23, 2019, 4:01 PM

#


[2019.06.23-15.53.04:794][374]LogNet: Warning: Network Failure: GameNetDriver[ConnectionTimeout]: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 0.00, Real: 271.82, Good: 271.82, DriverTime: 7.53, Threshold: 60.00, [UNetConnection] RemoteAddr: 127.0.0.1:17777, Name: IpConnection_0, Driver: GameNetDriver IpNetDriver_0, IsServer: NO, PC: BP_PlayerController_C_0, Owner: BP_PlayerController_C_0, UniqueId: NULL:DESKTOP-VRJ2G1O-A2C50F0643C9616A889006825146B5C5
[2019.06.23-15.53.04:794][374]LogNet: NetworkFailure: ConnectionTimeout, Error: 'UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 0.00, Real: 271.82, Good: 271.82, DriverTime: 7.53, Threshold: 60.00, [UNetConnection] RemoteAddr: 127.0.0.1:17777, Name: IpConnection_0, Driver: GameNetDriver IpNetDriver_0, IsServer: NO, PC: BP_PlayerController_C_0, Owner: BP_PlayerController_C_0, UniqueId: NULL:DESKTOP-VRJ2G1O-A2C50F0643C9616A889006825146B5C5'

#

[2019.06.23-15.53.04:794][374]LogNet: UNetConnection::Close: [UNetConnection] RemoteAddr: 127.0.0.1:17777, Name: IpConnection_0, Driver: GameNetDriver IpNetDriver_0, IsServer: NO, PC: BP_PlayerController_C_0, Owner: BP_PlayerController_C_0, UniqueId: NULL:DESKTOP-VRJ2G1O-A2C50F0643C9616A889006825146B5C5, Channels: 9, Time: 2019.06.23-15.53.04
[2019.06.23-15.53.04:794][374]LogNet: UChannel::Close: Sending CloseBunch. ChIndex == 0. Name: [UChannel] ChIndex: 0, Closing: 0 [UNetConnection] RemoteAddr: 127.0.0.1:17777, Name: IpConnection_0, Driver: GameNetDriver IpNetDriver_0, IsServer: NO, PC: BP_PlayerController_C_0, Owner: BP_PlayerController_C_0, UniqueId: NULL:DESKTOP-VRJ2G1O-A2C50F0643C9616A889006825146B5C5

#

the start of the crash then it starts unloading everything ^

echo pond Jun 23, 2019, 7:42 PM

#

hey, is there an easy way to replicate a variable only when a certain condition is met (and if so how expensive is it)?

severe widget Jun 23, 2019, 7:52 PM

#

in C++ yes, cheap

echo pond Jun 23, 2019, 7:53 PM

#

how to go about it?

rotund sapphire Jun 23, 2019, 8:01 PM

#

@spare glade The error is strange indeed. It may be because the max inactive players is 1 or 0 (for 0 it would not hit error i suppose but perhaps 1 is an ominous number). Check your gamemode settings the value should be 16 by default. maybe it solve the glitch once you set it back to default. Other than that, your game is kinda failing to maintain arrays which is rather strange and i have no idea atm what else could be the source of the error.

meager spade Jun 23, 2019, 8:49 PM

#

you can adjust the Replication (ie only replicate) when you like,

#

        DOREPLIFETIME_ACTIVE_OVERRIDE(AAresWeapon_Ranged, CurrentFiringSpread, true);```

#

something like that

#

can toggle the property replication on/off

echo pond Jun 23, 2019, 9:00 PM

#

thanks

#

I wasn't sure how efficient it was

meager spade Jun 23, 2019, 9:03 PM

#

obvs only the server can do that

echo pond Jun 23, 2019, 9:11 PM

#

yea naturally :)

devout galleon Jun 23, 2019, 10:16 PM

#

should i do multiplayer after i finish my game or as im doing my game?

winged badger Jun 23, 2019, 10:16 PM

#

multiplayer is not an afterthought

devout galleon Jun 23, 2019, 10:18 PM

#

i guess i do it as i do the game

cerulean escarp Jun 23, 2019, 11:24 PM

#

I'm new to networking and I can't get my animations to replicate to other clients. I'm using a multicast and it successfully changes the animation from idle without a weapon to idle with a weapon flawlessly across all clients, but for some reason it doesn't do the same for the movement animation.
here's the animation controlling portion of my FPSCharacter BP:
https://i.imgur.com/iie7PIW.png

Imgur

meager spade Jun 23, 2019, 11:38 PM

#

only the server can call the multicast

#

so if they are not running on the server, they will never multicast

#

also why you sending a movement bool to the animgraph

#

that is terrible

#

animbp should NEVER receive values like that

#

instead it should pull the value

#

and you can easily just get the actors velocity to tell if they are moving

#

and that will be on server and client

#

and all other clients

#

what you are doing is trying to re-invent the wheel

#

and using more network resources in the process

limber mortar Jun 24, 2019, 12:30 AM

#

I need some help figuring out why my new helicopter works for a little while and then stops lifting vertically. It works for 4-5 minutes before having problems, due to past experiences I thought it could be a replication issue. But I can't figure it out 😦

#

📎 Support1.png

#

📎 Support2.png

#

I'm a novice

#

when the elevation impulse fails I can still steer side to side and such, it just starts gradually losing elevation like it is idling while holding throttle input, print screen shows 1.0 as the correct value for the upward input when it fails

limber mortar Jun 24, 2019, 12:56 AM

#

if I exit the chopper, my new pawn's actions work just fine

#

so I don't think the game is messed up

#

The fire continues to burn, trees still disappear, et cetera

📎 unknown.png

copper mango Jun 24, 2019, 1:34 AM

#

anyone have a problem where like an AI character capsule separates/jitters away from the skeletal mesh in dedicated server?

#

wait it looks like the net smoothing only applies to the meshes and not the capsules?

copper mango Jun 24, 2019, 2:09 AM

#

well, I changed it so my WidgetComponent is attached to the mesh instead of the capsule and you can't really notice the jittering anymore, even though it's happening

#

because the mesh is smoothed

#

doesn't feel great but I figure I'm probably gonna have to write a custom move component for my AI dudes ultimately anyway

shut osprey Jun 24, 2019, 2:39 AM

#

I'm researching the OnlineSubystem interfaces IOnlineUserCloud and IOnlineSharedCloud, and I am looking for examples of their usage to make sure that I am aligned with the industry. Does anybody know of any public/example projects that use those two interfaces?

Interface links for reference:
https://docs.unrealengine.com/en-US/API/Plugins/OnlineSubsystem/Interfaces/IOnlineUserCloud/index.html
https://docs.unrealengine.com/en-US/API/Plugins/OnlineSubsystem/Interfaces/IOnlineSharedCloud/index.html (edited)

twin minnow Jun 24, 2019, 3:23 AM

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has anyone seen this kind of log message when trying to call OpenLevel to connect to the server?
Ignoring restart handshake request, due to < 10 seconds since last handshake.

spare glade Jun 24, 2019, 4:10 AM

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@rotund sapphire seems to be good now, i just need to leave it on a higher number for now on or default. thnx

unique kelp Jun 24, 2019, 11:54 AM

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Do RPCs batch? and would I even want them to?

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might be a stupid question

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I have read they are sent as soon as you call the function, so I'm assuming no

meager spade Jun 24, 2019, 12:38 PM

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reliables are batched

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as they are deemed reliable to, so if they don't get sent through straight away, they will eventually

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unreliable will be dropped if they cant get to through

fleet raven Jun 24, 2019, 12:41 PM

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for some reason the engine can decide to not even try to send unreliables

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you'd think they are unreliable on the network layer only - as in, not resent when the packet is lost, but it goes much further than that

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it can just discard them when it thinks the connection might be busy

twin juniper Jun 24, 2019, 3:45 PM

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I have big problem. How can I add multiplayer to destructible object? Creating custom event for multicast replication or adding replaction for function above?

modern swift Jun 24, 2019, 4:16 PM

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anyone know how to setup the replication graph to let a specific group of connection sync to each other. I trying to create a UDAReplicationGraphNode_AlwaysRelevant_ForConnection node , but I dont know how to add some group of actors to this node

slender yarrow Jun 24, 2019, 4:16 PM

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So im trying to connect to my dedicated server from another computer in my house. This is what the server log is showing. It does this endlessly and I never fully connect and move to the playable map. Just a black screen on the client. People outside of my house are able to connect successfully though. Anyone know what would cause this?

📎 Untitled.jpg

modern swift Jun 24, 2019, 4:18 PM

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I tried to use RouteAddNetworkActorToNodes , I dont know how to setup FNewReplicatedActorInfo to make it added in UDAReplicationGraphNode_AlwaysRelevant_ForConnection node

shut gyro Jun 24, 2019, 5:29 PM

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Has anyone played around with the Physic Error Correction settings in the Project Settings with multiplayer testing?

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If so, how reliable has it been to see less jitter with PhysX actors and what values are appropriate for fast-moving vehicles?

dark edge Jun 24, 2019, 6:03 PM

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I've messed with it but not much. I'm waiting on Chaos to deal with networked physics.

twin juniper Jun 24, 2019, 6:29 PM

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Why this destructible wall don't replicate to other clients? This is my BP functions:

https://gyazo.com/4ef3b9c8ccc5eb7a1d36be74839835e6

📎 9f533bc7249fa9dd39297a1b79bf4484.png

Gyazo

▶ Play video

worthy perch Jun 24, 2019, 6:36 PM

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Clients shouldn't call Multicast RPCs.

twin juniper Jun 24, 2019, 6:43 PM

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@worthy perch so how can I do this? property replication?

worthy perch Jun 24, 2019, 7:04 PM

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Replicating the health of the destructible would be better, yeah.

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And have the clients change the appearance of the destructible via OnRep.

meager spade Jun 24, 2019, 7:07 PM

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tell the server to do the multicast

twin juniper Jun 24, 2019, 7:13 PM

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@meager spade you mean health property?

bitter oriole Jun 24, 2019, 7:13 PM

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Something like health needs to be changed on server only, and replicated to everyone

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These two things need to happen, anyway

twin juniper Jun 24, 2019, 7:27 PM

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Okey, I think I understand this. So players shoot on destructible objects, server changes healt and replicate to everyone, I will try do this - thanks for tips

opaque flicker Jun 24, 2019, 8:26 PM

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Hi, I have a problem that i dunno why it's happening, I have a spectator camera pawn that's os possessed by a specific client -- it's replicated and all fine, this spectator camera follow another player (on server and client for sure as it's replicated), but when this player is beyond certain range all of his child actors disappear and become not replicated anymore (from the spectator camera view), when he's back to the initial area everything appears just fine ,, any clue why this could be happening ?

winged badger Jun 24, 2019, 8:28 PM

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without the spectator pawn being replicated

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its net relevancy position doesn't change

opaque flicker Jun 24, 2019, 8:28 PM

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what should happen is that this player and his child actors that the camera pawn is following should be replicated all the time since the spectator camera is in it's relevancy

winged badger Jun 24, 2019, 8:28 PM

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so when you get out of 15k UU range, everything suddenly becomes not net relevant and culled

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only exception being the current viewtarget

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sorry, you did say it is replicated

opaque flicker Jun 24, 2019, 8:30 PM

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yea

winged badger Jun 24, 2019, 8:30 PM

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its still a distance based net relevancy culling

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where is the spectator pawn physically when the observed player gets out of range?

opaque flicker Jun 24, 2019, 8:31 PM

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why this happend lol, the pawn is on the head of the player

winged badger Jun 24, 2019, 8:31 PM

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so its attached?

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did you run the attachement on the server?

opaque flicker Jun 24, 2019, 8:31 PM

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he was actually over his head

winged badger Jun 24, 2019, 8:32 PM

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ok

opaque flicker Jun 24, 2019, 8:32 PM

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i'm not attaching

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just set actor transform with interp

winged badger Jun 24, 2019, 8:32 PM

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is it there on the server, or are you just teleporting it around locally on tick?

opaque flicker Jun 24, 2019, 8:32 PM

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tick yea

winged badger Jun 24, 2019, 8:32 PM

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because its server position determines net relevancy

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doesn't matter where it is on client

opaque flicker Jun 24, 2019, 8:33 PM

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the server is moving then replicates to client

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i'm printing postion on server and client and they r both the samew

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same*

winged badger Jun 24, 2019, 8:34 PM

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try attaching the specatotor controller to the spectator pawn

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you have a checkbox for it in class defaults

opaque flicker Jun 24, 2019, 8:35 PM

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hmmm spectator controller ? is that a thing ?

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u mean player controller ?

winged badger Jun 24, 2019, 8:36 PM

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yeah

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assumed they were different, but they don't have to be

idle blaze Jun 24, 2019, 8:41 PM

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Could I get some clarification on RPCs? https://docs.unrealengine.com/en-US/Gameplay/Networking/Actors/RPCs/index.html This page says that:
They must be called from Actors.
Does that mean that the RPC function itself (e.g., marked UFUNCTION(Server)) must be called by an Actor? What if another object calls an Actor function that calls an RPC?

RPCs

Designating function replication across the network

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To give a more specific use case: let's say I want to call an RPC from an AnimNotify. Can I call a function on the Actor that internally calls the RPC? Or can I call the RPC directly from the AnimNotify?

opaque flicker Jun 24, 2019, 8:47 PM

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@idle blaze you can call RPC from server to clients by anim notify if this server will call this notify too, and call RPC from client to server from anim notify if the owner of the animation blueprint is local

idle blaze Jun 24, 2019, 8:49 PM

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In that case, I'm confused by what it means that "[An RPC] must be called from Actors." Does it just mean the RPCs must be defined in an Actor?

opaque flicker Jun 24, 2019, 8:50 PM

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@idle blaze hold a second then let me check my anim BP, may be i have used some

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there u go, and it works fine

📎 notify.png

idle blaze Jun 24, 2019, 8:52 PM

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Interesting, thank you.

opaque flicker Jun 24, 2019, 8:52 PM

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yw

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@winged badger so i have attached the player controller to the pawn and still the child actors of the player i'm spectating disappear

winged badger Jun 24, 2019, 8:56 PM

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just the child actors?

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you have their base in c++?

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do

opaque flicker Jun 24, 2019, 8:59 PM

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well the player donesnt disappear cuz i'm setting him always relevant, but when i uncheck this, it disappears too 😄

winged badger Jun 24, 2019, 8:59 PM

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AMyChildActor::IsNetRelevantFor(params)
{
    if (GetAttachParent())
    {
        return GetAttachParent()->IsNetRelevantFor(params);
    }
    else
    {
        return Suoer::IsNetRelevantFor(params):
    }
}

opaque flicker Jun 24, 2019, 9:00 PM

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sadly i'm using BP

winged badger Jun 24, 2019, 9:00 PM

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any use of replication graph?

opaque flicker Jun 24, 2019, 9:00 PM

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nop

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i'm guessing that the server doesnt know where the client is so it doesn't replicate the player to him

winged badger Jun 24, 2019, 9:01 PM

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the relevancy evaluation is done server side

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it never runs on client

opaque flicker Jun 24, 2019, 9:03 PM

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so as long as the server of the spectator pawn is in the same area of the player, he should be relevant right ?

winged badger Jun 24, 2019, 9:03 PM

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well

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it should be enough if you teleport the spectator over players head every 1-2 seconds

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and interp only locally on client

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you don't even need to replicate its position

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and i am pretty sure about that, as i use a similar setup for RTS controls

opaque flicker Jun 24, 2019, 9:17 PM

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in my setup the server is moving the spectator pawn in tick to the player camera location, and since it's replicated the client follows

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but still this problem exist frim nowhere lol

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the spectator pawn is set only relevant to owner tho

twin juniper Jun 24, 2019, 9:29 PM

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Why projectiles from weapon works only client to server, and client to client but no for server to clients?

I declare this void I character CPP:

void ServerFire();```

meager spade Jun 24, 2019, 9:37 PM

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no clue, you probably did something wrong

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but that should work like you said, Client to Server and server to client

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as long as you spawn the projectile on the server

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and its set to replicate

winged badger Jun 24, 2019, 10:45 PM

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replicate a boolean

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set collision from onrep

cerulean escarp Jun 24, 2019, 10:49 PM

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I have no idea how to do that xD

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the onrep thing

twin juniper Jun 24, 2019, 10:53 PM

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Why this shoot spawn projectile works only on client -> serwer?

{
    if (ProjectileClass != NULL)
    {
        UWorld* const World = GetWorld();
        if (World != NULL)
        {
            const FRotator SpawnRotation = GetControlRotation();
            const FVector SpawnLocation = ((FP_MuzzleLocation != nullptr) ? FP_MuzzleLocation->GetComponentLocation() : GetActorLocation()) + SpawnRotation.RotateVector(GunOffset);

            //Set Spawn Collision Handling Override
            FActorSpawnParameters ActorSpawnParams;
            ActorSpawnParams.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AdjustIfPossibleButDontSpawnIfColliding;

            // spawn the projectile at the muzzle
            World->SpawnActor<AFPSGameProjectile>(ProjectileClass, SpawnLocation, SpawnRotation, ActorSpawnParams);
        }
    }
}```
In projectile constructor I have:
```SetReplicates(true);
    SetReplicateMovement(true);```

twin minnow Jun 25, 2019, 1:34 AM

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if i want to pass a string from the client to the server using OpenLevel, would I pass it in through the Options parameter or would I append to the level name ?StringIWantToPass

meager spade Jun 25, 2019, 3:34 AM

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?Something=Something

fossil spoke Jun 25, 2019, 3:53 AM

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?Key=Value?Key2=Value2?Key3=Value3...

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Just to help clarify what @meager spade said.

#

Thats how the Options string wants to be formatted.

arctic bone Jun 25, 2019, 4:18 AM

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weird question, is there a way to write totally separate files for server and client?

twin minnow Jun 25, 2019, 4:52 AM

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thanks guys, u guys are life savors as usual

fossil spoke Jun 25, 2019, 4:59 AM

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@arctic bone How do you mean exactly?

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What files?

arctic bone Jun 25, 2019, 5:05 AM

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lets say i want a door in my game, i can have the door.cpp and door.h, then in the door implementation i can have something like 'if has authority, open door'

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what i want is a completely separate file for door_client and door_server, and only door_server has the function open door

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if that even makes sense

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@fossil spoke

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i might not even necessarily need a door_client if the client can't interact with it, like if its an automatic door for instance

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i just dont want to deal with all the if (HasAuthority()) junk to find out my roles

severe widget Jun 25, 2019, 5:08 AM

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Typically this is done all-in-one file

#

#if WITH_SERVER_CODE
void OpenDoor();
#endif```

arctic bone Jun 25, 2019, 5:09 AM

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oh interesting

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so i just put all my server code in there

fossil spoke Jun 25, 2019, 5:10 AM

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Yeah use the Preprocessors to block code you want to be separate for which target your building for.

arctic bone Jun 25, 2019, 5:10 AM

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not the cleanest but if it works what the heck

severe widget Jun 25, 2019, 5:10 AM

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You can do the inverse, #if !WITH_SERVER_CODE but nobody does that

arctic bone Jun 25, 2019, 5:10 AM

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im assuming WITH_SERVER_CODE is true for when it is the server running

severe widget Jun 25, 2019, 5:10 AM

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Generally, your server should be doing a superset of what your client does.

#

Nah, conditional compilation is determined before packaging.

#

YourGame_Server.exe

#

YourGame_Shipping_Win64.exe

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etc

arctic bone Jun 25, 2019, 5:11 AM

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ah, does it still work on the pie environment?

fossil spoke Jun 25, 2019, 5:11 AM

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Its UE_SERVER though isnt it? @severe widget

arctic bone Jun 25, 2019, 5:12 AM

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guess testing is easy enough

fossil spoke Jun 25, 2019, 5:12 AM

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Never heard of WITH_SERVER_CODE

arctic bone Jun 25, 2019, 5:12 AM

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is there a list of these preprocessor defines?

fossil spoke Jun 25, 2019, 5:12 AM

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Build.h has them.

severe widget Jun 25, 2019, 5:12 AM

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🤔

fossil spoke Jun 25, 2019, 5:13 AM

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/** 
 *   Whether compiling for dedicated server or not.
 */
#ifndef UE_SERVER
    #define UE_SERVER                    0
#endif

arctic bone Jun 25, 2019, 5:13 AM

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thanks

severe widget Jun 25, 2019, 5:14 AM

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Heh.

#

Might be project specific. :whoops:

arctic bone Jun 25, 2019, 5:14 AM

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my very rudimentary test is telling me that it does not work in pie, ill keep trying

severe widget Jun 25, 2019, 5:15 AM

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PIE won't tell you anything

arctic bone Jun 25, 2019, 5:16 AM

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i guess all i really have to do is just change if UE_SERVER to if true when testing out dedicated server functions in pie

severe widget Jun 25, 2019, 5:16 AM

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It's WITH_EDITOR, UE_SERVER, UE_GAME, etc, etc

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all set to 1

#

PIE is basically most things.

#

You wanna do a different client and server exe to test compartmentalization of code.

fossil spoke Jun 25, 2019, 5:17 AM

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Yeah PIE isnt where you should be worrying about that

severe widget Jun 25, 2019, 5:19 AM

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@fossil spoke

📎 unknown.png

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Nah we good

fossil spoke Jun 25, 2019, 5:19 AM

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So its in the GAS plugin?

severe widget Jun 25, 2019, 5:20 AM

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Nah

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It's a compile variable added by UBT

fossil spoke Jun 25, 2019, 5:20 AM

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So thats why i cant scope to it lol

severe widget Jun 25, 2019, 5:20 AM

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📎 unknown.png

#

UEBuildTarget.cs

fossil spoke Jun 25, 2019, 5:21 AM

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Wonder why they have both

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🤷

severe widget Jun 25, 2019, 5:21 AM

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UE_SERVER isn't in here.

fossil spoke Jun 25, 2019, 5:21 AM

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UE_SERVER is in Build.h, its probably just saying that we are building for Dedi

severe widget Jun 25, 2019, 5:22 AM

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TargetRules.cs is where UE_SERVER is added

fossil spoke Jun 25, 2019, 5:22 AM

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Its also defined in Build.h

severe widget Jun 25, 2019, 5:23 AM

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Well, only if it isn't pushed through by UBT

fossil spoke Jun 25, 2019, 5:23 AM

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Yeah

severe widget Jun 25, 2019, 5:23 AM

#

Anyway, it appears UE_SERVER, UE_GAME, and UE_EDITOR are mutually exclusive

#

if you want your code to legit only work in a server, UE_SERVER is your preprocessor macro @arctic bone

arctic bone Jun 25, 2019, 5:39 AM

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thanks homies!

brittle tulip Jun 25, 2019, 10:10 AM

#

hey i want to make a coop multiplayer game in c++ any where i can see a tutorial where to do this ?

bitter oriole Jun 25, 2019, 10:12 AM

#

Gonna need a whole lot more details

brittle tulip Jun 25, 2019, 10:13 AM

#

like what?

bitter oriole Jun 25, 2019, 10:13 AM

#

Like what game is it ? If you're doing multiplayer physics, the tutorial is going to be one word - "no"

#

Multiplayer is a whole field of work, not a feature

brittle tulip Jun 25, 2019, 10:14 AM

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oh so its a zombie horde game with waves

#

doesnt use physics

bitter oriole Jun 25, 2019, 10:18 AM

#

Is it a shooter ? Vehicle game ?

brittle tulip Jun 25, 2019, 10:18 AM

#

shooter

bitter oriole Jun 25, 2019, 10:18 AM

#

In that case you basically have multiplayer working already

#

You want to look at sessions (something like the advanced session plugin is a good start), and any tutorial on multiplayer will explain the concepts you'll need for game features

brittle tulip Jun 25, 2019, 10:20 AM

#

I have been looking at some tutorials but the ones on youtube only show blueprints

#

and one said to replicate a variable inside the game instance

bitter oriole Jun 25, 2019, 10:20 AM

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Okay ?

#

Most BP stuff is rather easy to translate into code

brittle tulip Jun 25, 2019, 10:21 AM

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yeah but ive seen that you cant replicate in a game instance

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with c++

bitter oriole Jun 25, 2019, 10:21 AM

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Of course, the game instance isn't replicated

#

Dunno how BP gets it to work

#

So replicate another class

#

If you're new to networking in UE4, C++ is not where you should start, tbh

brittle tulip Jun 25, 2019, 10:22 AM

#

ah

#

alright ill do it in blueprints and come back to it later then

hasty adder Jun 25, 2019, 11:45 AM

#

Hey question. I got a level cloud bp that moves around the world. Should I be spawning the cloud bp in from gamestate because the actor dropped in the level with replicate movement doesn’t seem to update its location to a newly joined player . Figured maybe if it’s spawned in it’ll pickup the location data

#

I tried on begin play for non server to set the bp location to the servers Vector. I have an idea that maybe the vector of location should get stores to a rep vector variable and client side it just continuiouslt keeps current location to that var