due to the physics integration
#multiplayer
chrome bay
waxen socket
No way...
chrome bay
(hopefully not)
analog rover
Which version were you testing from @chrome bay ?
chrome bay
I think I downloaded the 4.25 plugin but was using 4.24 at the time. Had to make some small tweaks to get it to compile there
Demo project does work though, I don't think there's any interop with GAS yet though
Mostly just movement-orientated atm
analog rover
I was more looking to just do generic interaction systems without having to route everything through gameplay abilities
Might be overkill in that case ๐ค
north kettle
not entirely mutliplayer related: can you get navmesh path info without using the CMC?
chrome bay
yeah, can get a navpath from anywhere
PathFollowingComponent interops with UNavMovementComponent
north kettle
yeah i'm currently trying to follow the code. i want to implement my own method on how to traverse the given path, but i dont even get any path result from FindPathtoLocationSynchronoously
and that would be pretty much all i need
wanton tulip
@limber gyro All working now fine and new Project, when I'm using my IP instead of 127.0.0.1. Thanks for your help man C: (NULL Subsystem, Steam i have to test)
limber gyro
@wanton tulip i dont think i did much but you are welcome hahaha
twin juniper
Hey what does steam means
wanton tulip
Steam Online Subsystem
brazen totem
Is there a trick to get steam to work from the editor (play standalone)? It works if I launch the game by right clicking the uproject file but not from editor
twin juniper
so is there a downside to doing this:
.h
UFUNCTION(Server, Reliable)
void ServerMyFunction();
.cpp
...
{ // if(something)
ServerMyFunction();
}
void Class::ServerMyFunction_Implementation()
{
// stuff here
}
vs
.h
void MyFunction();
UFUNCTION(Server, Reliable)
void ServerMyFunction();
.cpp
...
{ // if(something)
MyFunction();
}
void Class::MyFunction()
{
if(!HasAuthority())
{
ServerMyFunction();
}
else
{
// ... stuff here
}
}
void Class::ServerMyFunction_Implementation()
{
MyFunction();
}
Seems like it's redundant to do the 2nd one, no?
steel vault
Actually wait, yes that is redundant
twin juniper
I just see the second method used in everything, so just curious why do all that extra work and functions instead of just directly calling the server function
north kettle
i think that depends on dedicated vs listen server
steel vault
I guess technically it's not though because when you call into the function and you are the server it doesn't call itself again
twin juniper
So the first one can used if you are a dedicated server, but the second one if you are peer to peer?
steel vault
What I normally do is check if I have authority, if I do, I call the normal local function. If I do not, I call the server function which then calls the normal local function
twin juniper
Yeah, I'm just curious why go through all that loop around lol
Is calling the Server function if you are already authority (the server) not good?
steel vault
If you are doing client actions, the server needs to know about them so it can do the same thing and basically synchronize your client with it
Yea it's a waste of a call
You don't need to RPC if you are already on the server
Unless you are trying to tell the client to do something from the server
north kettle
i guess that pattern is there so even if a client were to call Myfunction, you'd be sure that it is actually executed through the authority
twin juniper
but if I was a client, and called ServerMyFunction(), wont that just go through the server anyway?
north kettle
yes, ifyou were to call the server function
steel vault
Yes. You are calling to the server to tell it what to do
The server knows nothing about a client action unless you tell it
north kettle
this would be when you wanna make sure that this function never executes on a client to begin with
steel vault
The server is your source of truth. If you fire a gun on a client you better tell the server to do the same or else no one else will know you fired your weapon besides you
Which means you basically never fired it at all
If you want to synchronize things properly, you would tell the server to fire it, and then communicate that same action back to the client OR just call the same function before calling the server one
twin juniper
but why do:
Fire() which checks authority, calls serverfire, then goes back to Fire to do the shoot
than just
ServerFire() directly tell the server to shoot
north kettle
it also means you can make MyFunction blueprintcallable, and not clutter the node api with Server_ functions
steel vault
By calling Fire() inside a server function you are telling the server WHAT to do
north kettle
its a design pattern to make sure you're executing function where they're supposed to run.
steel vault
Fire is an already made function that you just want to get called on the server, so you must tell the server to do it by calling an RPC aka a server function
And the server function mimics the same behavior by simply calling Fire()
It's just the way RPCs work
If you did not call fire on the client and only on the server, however, the server will see it happen and your client will not
twin juniper
but I just don't get why I can't just say hey ServerFire() which is a server RPC, than doing Fire(), which calls the server rpc and goes back to Fire(). Can't I just put all the Fire() logic inside ServerFire(), call ServerFire() directly, and it do the same thing
steel vault
But what happens when you don't want it to fire on the server?
You're splitting out logic so that you can use it for non server implementations if necessary
twin juniper
then I don't call ServerFire?
i would only call Fire() if I wanted to fire on the server to begin with, no?
because it will go through and call the server rpc
steel vault
What you posted before with MyFunction() basically tells you to call the server no matter what if you are the client, and only call the local implementation if you are not
If you have a Fire() function that is just a regular function with logic, then you make a Server_Fire() function that is UFUNCTION(Server) and only call it when you need to call the server then that is fine
twin juniper
if(!HasAuthority())
{
ServerMyFunction();
}
else
{
// ... stuff here
}
But I am saying if I am not the server, call my server, which then calls this function again, and it will then go down my else branch.
My question is, why can't I just put that else branch inside ServerMyFunction() and just call ServerMyFunction() directly, instead of it going through basically a loop with Fire();
twin juniper
But I just don't understand why most do that redundant call if it's redundant lol
I didn't know if there was a point to that
or just choice
steel vault
You're trying to keep logic in as few places as possible. I don't do it the way you have posted. I make a function called Replicated_Fire() which says am I authority? If so call Fire(), if not call Server_Fire() and Server_Fire() simply calls Fire(). There is no redundancy there
Then I just call Replicated_Fire() if I want it to be replicated to the server
Or Fire() if not
twin juniper
but isn't that putting stuff in more places than just calling ServerFire() directly?
steel vault
Calling Server_Fire() is calling an RPC. You don't want to call an RPC unless you need to
Server_Fire() would be marked UFUNCTION(Server)
steel vault
You want to keep your RPC deciding logic on the client
So you don't have to call into a server RPC to figure it out
twin juniper
so if I am already the server, such as a listen server, I don't want to call the RPC on myself, just call the function
steel vault
Correct
twin juniper
but if I do call the RPC on myself, is there any implications to that, or just an unnecessary RPC call basically
steel vault
Should yes. But I wouldn't recommend it
twin juniper
Haha, alright. Thanks man. Sorry for the confusion
steel vault
Np!
north kettle
ugh. i just realized that my packaged game, when not focused, running at ~5fps, and i'm assuming that this might be where all my replication issues stem from. its the first time i see that happening in packaged versions though. does anyone happen to know the flag to disable that?
steel vault
Anyone here know a best practice for telling clients about damage taken or do you just multicast the event from the server? I assume everyone lets the server decide when damage happens and replicates it to clients.
I was considering just adding a replicated property for last damage taken and saying OnRep and then react to it client side.
north kettle
it depends on usecase, generally i'd just replicate the health variable
steel vault
Well my health variable is replicated, but for me if I want to decide more things to happen based on the damage type or hit location etc, I would need the same amount of information that take damage has passed in
north kettle
then i reckon an unreliable multicast is your way to go
lucid socket
Hey guys,
I've been having an issue with changing a projectiles initial speed value for a long time. Every different way I've tried has either not worked or produced laggy results for clients. Could anyone help guide me in the correct way to change the initial speed of a projectile?
Is initial speed the right way to go, or should the projectile movements velocity be changed instead? If so, should this be on a rep notify?
Context, I'm spawning an arrow that has it's initial speed changed depending on how long the player has held down the fire button
winged badger
you're not changing it in flight
if your arrow is replicated, then just having a replicated FVector InitialVelocity there would make sure that InitialVelocity is good on clients before they call BeginPlay
in which case they just need to set velocity on ProjectileMovement to INitialVelocity and they are good
no additional replication required @lucid socket
meager spade
deferred spawn is your friend
winged badger
because then you can use same BeginPlay logic on server + clients
lucid socket
thanks for the reply, I'm just trying to visualize it, sorry one sec
winged badger
you also want client authority for determining the initial velocity and then RPCing that to server
otherwise it will feel clunky and non-responsive
lucid socket
ok so, am I correct in saying there is a variable I set called Initial Velocity (FVector) in the projectile in the construction script, the value sets the projectile movements Velocity?
I currently have it like this, sorry if I'm misunderstanding
lucid socket
ah
winged badger
not when its replicated to clients
as construction script then runs before replication
BeginPlay ruins after
lucid socket
thanks for clarifying, i've been misinformed for a long time about the construction script
lucid socket
๐
this seems to work smoothly now, just the spawn rotation to fix when spawning now, appreciate the help!
floral crow
Is there any way I can make use of ReplicationCondition "Custom" from Blueprints? I've found no BP counterpart to SetCustomIsActiveOverride
I'm confused by the fact that it is available there but I can't seem to find any way to operate with it
lucid vault
What is the optimal way for HUDs and players to communicate in a multiplayer game? Currently, I use dispatchers from my player state that get received in my HUD class. Does it make sense to do this as opposed to having the player controller send information? I figured that if the player controller was the one setting data, I would need a new player controller for every game mode that has a different HUD with different requirements
gleaming niche
i do both, depending on the type of information.
even gamestate for some stuff that doesn't matter if it lags behind.
if it's something that should be reliable, like it must be received, and it only needs to be sent once, then with an rpc
winged badger
i often call into the HUD directly, as the delegate setup is far more verbose and HUD is large as is
i never call into widgets directly though
lucid vault
If the player controller calls into the HUD directly, does that mean you have a different player controller for every game mode?
Also, when you say that you do not call into widget directly, I'm assuming that means you use the HUD as a mediary?
winged badger
i have two PCs but they all both have their own HUDs
no, widgets have a context
and use event based approach with what they are supposed to display
HUD just manages which widget is shown when and where
So i'll have something like HUD->ShowMissionObjectives();
i do have almost 300 differnt widgets in the prject
so while HUD doesn't manage all of them directly
its still way too verbose for HUD to just respond to event dispatchers for show/hide
lucid vault
That makes sense. So you don't create HUDs based upon gamemodes, but rather player controllers
If your widget requires a variable from the player state, do you pass that variable from your controller to the HUD?
winged badger
i pass it a reference to the playerstate
well, not really, as it can find the PS on its own
but if its context was something thats not as easy to find as PlayerState
i'd pass it a reference to that object when the widget was instantiated
uneven cliff
From what I understand, it's better to design your game from the ground with multiplayer in mind. That being said, if you've already got a full game, since UE4 has a lot of built in MP support, how difficult would it be to make that game multiplayer?
tall raft
You need to change every BP which should be replicated, which means any change to that should be visible to other players.
Also, some of functionalities depends on user being server, so in multiplayer none or just 1 player (listen server) is a server, so you need to remake that in mind.
Every statistics/health counters etc needs to be rebuild too.
There are a lot of caveats about that and you need to rethink most of things you did. And test if everything works fine.
uneven cliff
Alright, thanks. I have a good idea of what would need to be rebuilt, but tbh I have next to no experience with networking. I know it'd be a massive undertaking.
tall raft
Multiplayer is complicated and not trivial at the beggining.
It's not that hard when you get your mind around it, but needs some effort. And a lot of headbanging when something is not working.
uneven cliff
Yeah, I was working on a very small MP thing and it took me about an hour to realize UMG events needed to be marked as reliable
tall raft
widgets are not replicated in the same fashion as actors, thats one of caveats ๐
uneven cliff
Yeah... the tutorials I've seen are lacking. It's like "let's spend 6 hours doing UMG, skip a video, and it's working"
tall raft
Yea, it's sometimes like that.
Or, on the other hand, some tutorial guys are going in opposite direction too much - they explain every basic thing too much :P. Fastforwarding them and looking for that 1 click that does all job is sometimes time-consuming.
winged badger
i have yet hear about a good MP tutorial video
tall raft
There is one, full written documentation-tutorial about this topic.
It's a great one, i have parts of it printed in front of me when i'm working on multiplayer. It's from 2017 but fair enough. It's even pinned to this channel.
ripe ferry
Hey everyone! I am pretty new to creating multiplayer games and wanted to know if its worth it to use GameLift/Playfab for my multiplayer backend. I am fairly comfortable in native AWS, but wanted to know if those these services provided features yall thought were super useful/time efficent or if they were worth the price point.
fossil spoke
GameLift is expensive.
Not sure about Playfab.
Though either solution is better than rolling your own.
However #epic-online-services might be a viable alternative now, not sure however.
We use GameLift.
Functionally its great.
sacred ridge
trying to replicate character movement, getting client stutter and cant seem to figure out how the hell to fix it lol
nvm figured it out. ima dingus
fossil spoke
Happens to the best of us.
lost inlet
i'm not sure if PaaS is always better than rolling your own
it depends on what your needs are
and at least if it's custom, it's yours and you can do whatever you want with it and you don't have to worry about API deprecations or the service just disappearing one day
gamelift seems terrible though, i've heard so many horror stories about it and that amazon's own game teams don't want to touch it with a 10ft barge pole
fossil spoke
Ive had problems with documentation and a few bugs here and there that we discovered.
But its usable for our purposes and given that i dont have anything to compare it to i guess im biased.
lost inlet
though the latter is worrying, being at the mercy of... amazon
fossil spoke
Its worked out reasonably well for us so far. Their support team has been quite helpful.
Although, we wont be using it for our next project lol
lost inlet
i preferred the look of playfab even though our current backend is on AWS
peak sentinel
this line crashes "access violation error" on multiplayer, why?
peak sentinel
GetCharacter() is controller 0 only?
peak sentinel
Instead GetCharacter() and GetControlledPawn() how can I access my pawns CharacterMovement?
drowsy belfry
Hello, I have a question about networked projectiles and attachment/detachment. I'm making a game on which the character has a weapon attached to his hand and what I want to make is an ability on which the character throws that weapon towards the enemy.
For this, the weapon replicates (and replicates movement) and has a projectile and a rotating movement component and what I do right now is calling a "Throw" function on the weapon. This function if the caller has authority detaches the weapon and activates the rotating and projectile movement components (which are deactivated while the player has the weapon on its hands).
if (HasAuthority())
{
DetachFromActor(FDetachmentTransformRules::KeepWorldTransform);
SetActorRotation(Direction.ToOrientationQuat());
FVector Velocity = FVector::ForwardVector * Force;
ProjectileMovementComponent->SetUpdatedComponent(GetRootComponent());
ProjectileMovementComponent->SetVelocityInLocalSpace(Velocity);
ProjectileMovementComponent->Activate(true);
RotationMovementComponent->Activate(true);
}
The problem with this is that even if in single player everything looks perfectly fine and the throw has a nice trajectory and spinning effect, when in dedicated server and with "average" lag simulation option the throw animation is done on the character and the bat does some strange teleports and ends where it would have landed and the trajectory or spin can't be seen at all.
If someone can tell how to make weapon/projectile throwing look fine even with lag let me know. I guess im missing something but I dont know what.
rich ridge
@drowsy belfry why don't you make your server only to teleport and let your clients handle animation or rotation stuff.
Your player character does know that enemy is throwing his weapon, so animate that weapon coming towards you, and server is doing translation update.
drowsy belfry
That might be an optimization (using projectile movement on server and rotation movement on clients only) but it's not what I'm asking, the teleport would still happen if the server is the one handling the projectile movement
random nymph
Is it possible to make replicated variable in base class, but only replicate that value on selected inherited classes?
Or does it take bandwith to have replicated values that never change?
worthy knot
Is this what dedicated server machines look like?
this is my test machine ^
So i upload my packaged game with the dedicated server here and launch it ^ ?
Need some huge tips on this
chrome bay
@random nymph you can do stuff like this:
if (OverheatConfig.bSupportsOverheating == false)
{
DisableReplicatedLifetimeProperty(AShooterWeapon::GetClass(), AShooterWeapon::GetClass(), "PackedOverheatData", OutLifetimeProps);
}```But that only works for flags that you set on the class itself.
random nymph
Oh, cool
chrome bay
So if you had an actor component that had a flag, you'd have to subclass the component, then add it to an actor
I added a UPROPERTY meta tag "EditSubclassOnly" to avoid changing it accidentally
If you want to do dynamic switching on/off of properties though, you can override PreReplication()
random nymph
Okay. What about the overhead of replicated property if it never changes? When replicated actor is spawned on the client are the replicated values initialized to default value without any additional data sent over the network if the server has never changed the value?
chrome bay
If it never changes it's never sent
random nymph
Okay that's nice
chrome bay
But it will still be in the changelist manager and compared
If the value is different from the serialized value, then the server will send the property
So if you change it in begin play or post init comps or something, it will be sent
random nymph
Okay makes sense. Thanks
chrome bay
ACharacter has an implementation for PreReplication btw
Which enables/disables the root motion replication stuff
I'm pretty sure disabling it there removes it from the changelist manager / skips comparisons too
meager spade
i disable replication in PreReplication
on my weapon
{
Super::PreReplication(ChangedPropertyTracker);
bool bCanReplicateAmmo = false;
if (UKaosAbilitySystemComponent* ASC = GetPawnASC())
{
bCanReplicateAmmo = !ASC->IsAbilityActive(PrimaryAbilitySpecHandle) && !ASC->IsAbilityActive(SecondaryAbilitySpecHandle);
}
DOREPLIFETIME_ACTIVE_OVERRIDE(AKaosWeapon, AmmoCount, bCanReplicateAmmo || bUpdateLocalAmmoCount);
if (bUpdateLocalAmmoCount)
{
bUpdateLocalAmmoCount = false;
}
}```
vagrant grail
I still need help with nerworking pleaaaaase ,anyone good at it please tag me
winged badger
@vagrant grail if you have a question ask it, without doing it in multiple channels
vagrant grail
@winged badger It's the same as yesterday, I can't printstring the num of players to all clients
worthy knot
Is this what dedicated server machines look like?
@worthy knot Does anyone know about this?
bitter oriole
Dedicated server machines look like what you use for your dedicated server
Usually a random Linux VPS with a bit of CPU
twin juniper
I have a widget component whose visibility is changed to true when a player walks close enough. The problem is that the visibility is set on all players. Is there a way for me to only change the visibility for the player that is close enough?
worthy knot
@bitter oriole The machine i am using is a total windows server and doesnt use a graphics card
or audio
winged badger
@twin juniper handle visibility locally, no network involved
worthy knot
So i deploy my packaged game folder with the server .exe and launch it from there for testing right? @bitter oriole
bitter oriole
@worthy knot Most people just rent a VPS since it's much cheaper, easier, safer and provides more performance than hosting your own machines.
For testing you can run your dedicated server from your development computer
worthy knot
I have tested from my own pc, but i need to test from an actual server machine that will be on 24/7
with a better CPU and ram
so tell me im not doing anything wrong here
bitter oriole
Well, does the actual server machine has access to uninterrupted redundant power and 100MB uplink ?
Because that's a lot more important than RAM
bitter oriole
Basically if your server hardware is not in a data center you are doing it wrong
Other than testing - testing you can do on your own development computer
worthy knot
im using an IBM's server
and its customizable, right now i have only taken a test machine
bitter oriole
Okay but the important part is not what is it but where is it
worthy knot
its in India
bitter oriole
Sigh
What I'm asking you is is this machine in a data center
yes/no
If it is, then you're good
if it's not, then you're not
worthy knot
Okay so thats how it is, ill ask the staff if it is or not
@bitter oriole it is a VPS machine of HP hosted through ESXi
im sure its in a data center
worthy knot
ooh aight
so about testing on the server machine , i just have to launch the server exe of my game, then make my pc join it via public IP right?
bitter oriole
Yes
worthy knot
Ok and do you know anything about joining the server via steam?
worthy knot
thanks
fossil zinc
I think there something I don't quite understand yet about RPC's. I have a combat game that clients can hit AI enemies. When an attack starts it will call a function in the enemy that tells him to react to that attack (They use this by starting an ability from the ability system) and play an anim montage. We start this ability by doing an RPC call to the server, since I supose there is where the ability should start. However, something weird is happening, since 9 out of 10 times this system will work nice, but every once in a while the attack will start and the hit reaction wont start. The RPC is reliable since Its a core gameplay feature. Is anything I'm missing?
This is what starts the ability
In each attack I have a reference to my target, so when is time to start the Reaction I tell him to call the function.
zinc garden
If you inflate the ping a lot, does it fail consistently then?
If not, it might not be a network issue
If it does, then maybe something to do with timing? Some event/function being fired off in the wrong sequence
fossil zinc
If I play locally always works.
Maybe is something about syncronization. I'll give it a look. From your perspective the RPC is fine, right? This should be made on the server?
near bison
How does reliable vs unreliable for RPCs work?
Does unreliable mean it's actually sent over UDP, and reliable over TCP?
Or are both sent over UDP and then taken care of accordingly by the engine?
zinc garden
I'm not an expert on multiplayer ๐ But looks fine
fossil zinc
As far as I know, reliable means that the game will make sure that the packages are being recieve over the network. Unreliable means that they may or may not arrive to the destination. Usually used for visual effects.
zinc garden
UE4 uses UDP. Reliable just means that it will queue it up and then fire it at some point
fossil zinc
Or something like that
zinc garden
And yeah, unreliable ones can be dropped if the queue is too long
near bison
Okay. It's actually a question more pertaining to how UE4 is utilizing the transport layer. Was wondering if UE4's networking implementation was some sort of UDP + TCP hybrid like modern VoIP
near bison
Really? I don't browse this place often ๐
meager spade
lol
near bison
thank you! ๐
meager spade
get lost with time lol
near bison
That's the one thing I don't like about discord. information is ephemeral and not search indexable
meager spade
yeah there is a search above tho
but yeah i understand what you mean
its not easy to find previous stuff
near bison
Yeah. Maybe discord will introduce a message history cap like Slack.
10k messages and you have to pay or something
fossil zinc
Just realized that the problem may be in the animation. I have anim notifies that use the Send Event to Actor, but only some times this event won't arrive. Is something I need to do or this method is not good for networking?
meager spade
make the notify Branching point
if its from a montage
ensure it happens before blends
(montages default to a .25 blend)
this can cause notifies to not fire.
wanton tulip
@limber gyro Today I just change the Online Subsystem from NULL to Steam ~ Not working ๐ฃ. The Client outdates even if I try to connect to my IP instead of 127.0.0.1. I tried it with Steam on and off, but nothing helps. Do you know what I have to change when I would like to use Steam for Dedicated Server?
brazen totem
is the steam subsystem still supposed to work when you run standalone from the editor?
brazen totem
hmmmm. doesnt work for me, but it does if I launch the game by right clicking the uproject file
limber gyro
that is strange indeed, works fine in .24
@wanton tulip if it complains about id's then you gotta override login and prelogin
wanton tulip
@wanton tulip what is the error in the log?
@limber gyro There aren't any Error in the Server. Nothing Red, but I can send you Client and Server Log if you want.
limber gyro
what does it do?
wanton tulip
Who, Server or Client?
limber gyro
client
does it show the map and then goes instantly back to the previous one?
like it tried to connect but got rejected
wanton tulip
No nothing
limber gyro
well there must be a something in the logs to tell you what is going on
if you are attempting to connect something must be going on
wanton tulip
Oh, here an error on the Client:
[2020.09.16-13.58.09:257][775]LogWorld: Warning: SetActiveLevelCollection attempted to use an out of date NetDriver: GameNetDriver
wanton tulip
No, that isn't the problem. I already read this. I turned on everywhere seamless ServerTravel
Maybe because in the beginning is standing:
[2020.09.16-13.58.08:855][725]LogNet: DestroyNamedNetDriver IpNetDriver_2147482045 [GameNetDriver]
[2020.09.16-13.58.08:855][725]LogExit: GameNetDriver IpNetDriver_2147482045 shut down
[2020.09.16-13.58.08:855][725]LogOnline: OSS: Creating online subsystem instance for: Steam
[2020.09.16-13.58.08:871][725]LogSteamShared: Warning: SteamAPI failed to initialize, conditions not met.
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamUtils() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamUser() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamFriends() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamRemoteStorage() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamUserStats() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamMatchmakingServers() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamApps() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamNetworking() failed!
[2020.09.16-13.58.08:871][725]LogOnline: Warning: STEAM: Steamworks: SteamMatchmaking() failed!
[2020.09.16-13.58.08:871][725]LogOnline: STEAM: [AppId: 0] Client API initialized 0
[2020.09.16-13.58.08:871][725]LogOnline: Display: STEAM: OnlineSubsystemSteam::Shutdown()
[2020.09.16-13.58.08:872][725]LogOnline: Warning: STEAM: Steam API failed to initialize!
[2020.09.16-13.58.08:872][725]LogOnline: Display: STEAM: OnlineSubsystemSteam::Shutdown()```that in PIE?
wanton tulip
No Packaged Game
winged badger
is your steam client running? ๐
wanton tulip
I tested both. But maybe when it is on, my Server use it so my Client cannot use it
wanton tulip
ok, so what the problem could be?
winged badger
well, this looks like that whatever machine ran that code couldn't find a steam client running on it
wanton tulip
But when I shut down the Server and start the Client this errors don't appear in the log?!
winged badger
usually dewdicated servers don't run on same machine as client
but i haven't worked with them much, so i wouldn't know
wanton tulip
Ok, I now started my Game first and then my Dedicated Server and then happends what sonicphi discribes, the client joins and get instantly kicked, because the UID not matching, because Client uses Steam and Server NULL. So I try to run my Dedicated Server on my laptop with another account.
low helm
Still having this eerie problem in multiplayer setup -
An AIController is controlling a pawn on the server which the client is never supposed to see. The pawn is not replicated.
Insanely, the unit shows up on the client anyway, but does not even run Beginplay logic, it's like a ghost. TearOff works, but only for currently connected clients. Clients who log in later will see all the ghosts of the controllers.
winged badger
how's it spawned?
low helm
The server runs a non-replicated spawnactorfromclass node, then that pawn runs SpawnDefaultController on server only branch, this replicates the pawn to the client
someone at Epic is on drugs or something
winged badger
how much c++ is involved?
low helm
all bp
chrome bay
If you Tear it off, client has to destroy it
It will initially replicate, then tear off just closes the channel down and gives client authority over the pawn
vagrant saddle
Is there a proper way to replicate setting a clients velocity? Iโve been trying to set up a system where the client asks the server to calculate itโs next velocity then the server tells the client what it is, but everything Iโve tried has failed.
I havenโt tried replicating their velocity variable directly yet, as Iโm not home right now, would that be the way to do it?
Also asking the server to do this every frame wouldnโt be an issue would it?
chrome bay
velocity already is replicated if you're using Replicated Movement
vagrant saddle
Well Iโm asking cause we set up a custom way of calculating velocity, but I think I may have figured out what my issue was
The way it calculates velocity is reliant on what the current inputs of the client is and I wasnโt sending that to the server when I asked it to calculate the next velocity
So those axis values were probably just staying as 0 when I asked the server to do stuff
I really wish I were home to test it lol
low helm
Is there any event that fires on client to signify a tear-off occurred and the client now has authority?
fluid flower
hey all, I got beacons working somewhat, but now wondering: if I run multiple instances of a server on the same machine, will the beaconports also have to be unique? if so, what is the commandline for it or is there another way?
wanton tulip
Ok, I now started my Game first and then my Dedicated Server and then happends what sonicphi discribes, the client joins and get instantly kicked, because the UID not matching, because Client uses Steam and Server NULL. So I try to run my Dedicated Server on my laptop with another account.
Seems to work, but only, when I am hosting on my PC an joining with Laptop. I think, because my Laptop uses the Windows defender. Thanks for your help ๐ (Zlo and sonicphi)
zinc garden
I'm using a Character, and I want to set a custom world rotation for the Mesh component that it has by default. That worked with just an additional cube staticmesh component that I added, but for the default skeletalmesh component, it seems like it's not working
I'm guessing maybe it has something to do with the prediction code of the CharacterMovement component?
Actually, I was being half-stupid. Stupid because I hadn't set "Component Replicates" for that skeletal mesh component. But only half-stupid because it reverts to 0 rotation as soon as I move. So I guess the prediction issue is still valid.
chrome bay
@low helm yes in C++, in BP probably not
@zinc garden The rotation has to be the default property
CMC will rotate it back to the default rotation for network smoothing
Also you don't need to mark that component as replicated
Wouldn't do anything in that case anyway
zinc garden
@chrome bay Alright, thanks. Yeah this is in BP. I'm going to try and figure out a hack to get around the issue. Like add a second skeletal mesh that I'll use instead. ๐
chrome bay
You can just set the rotation in the details panel
It just has to be the default rotation for that class
zinc garden
Hmm... what do you mean? For the default mesh?
That's what I tried, but it resets it to 0
analog rover
Is there a way to send an RPC to just one client without routing it through a client owned actor?
livid holly
has anyone ever had a problem where you put two player starts in the level, and when you run a multiplayer game, sometimes the game only spawns 1 of them?
I think the game is sometimes trying to target the same player start to spawn the 2nd player, and failing
while sometimes it works and each player goes in a diff start
I get a LogSpawn: Warning: SpawnActor failed because of collision at the spawn location for BP_Pawn... yeah but shouldn't you try another player start?
ok I found an overridable game mode function, InitNewPlayer, where you can pass a string param that will be a tag for the player start... this should be standar dbehavior IMO though
strong vapor
grim lintel
I also had to learn that the hard way recently.
meager spade
where is the multiple pistols
faint seal
the pistol pointing right, there are two front sights. In the firing animation you can see one of the front sights staying still
meager spade
cause that last screenshot doesn't really show multiple pistols
yeah but you shoulda moved them slightly or highlighted them ๐
and with that little bit of code, nope
faint seal
yeah lol, i'll try to get a better shot
meager spade
need to see more of your flow
if you are spawning them beginplay
then you are likely spawning two copies
cause you are doing a server rpc
so client and server both ask to spawn a weapon
faint seal
Yeah it's begin play
meager spade
BeginPlay runs on Server AND client
so use HasAuthority node
and choose a direction
tbh server should just spawn it
no need for the RPC
faint seal
So use the authority and just go straight to the function?
meager spade
yes
lucid vault
Can I get the player controller from the player state on the server?
meager spade
sure..
lucid vault
in bps ๐
meager spade
yes
lucid vault
how?
meager spade
PlayerState owner is the PlayerController
so PlayerState->GetOwner->Cast PlayerController
lucid vault
oh, lol. That makes sense
livid holly
is there a delegate / a function / any way for the game mode to know that the game state has spawned in clients and can multicast there?
I'm starting the match at PostLogin, when the right number of players have entered. Then, from the game mode, I'm calling a Multicast function in the game state... but it only executes on the server
if I give a delay (2 sec), it executes in both sides... however delay is not a good way to handling netcode
meager spade
what are you multicasting?
the proper way is to NOT start the match till criteria is met, then you call StartMatch
livid holly
a custom funciton to kick off the match, the game state will do broadcasts and handle some initial states and allow the match to begin
meager spade
players all connect and wait, once gamemode says, yep all players connected, then it starts the match
livid holly
yeah I'm doing this on Post Login after I've ensured all players connected, but aparently I need the game state to exist in clients as well
livid holly
as in, right after Post Login it's too soon
meager spade
why not just send a Client RPC to all players?
if they need to do something
you can do that at any time if the RPC is on the client.
err PlayerController
livid holly
I could refactor indeed, it's just bc I put some "general state" logic in the game state, while the players handle more their own things
is there a built-in function or delegate or trigger for the game mode to know that the game state exists in the client?
meager spade
no
livid holly
yeah, probably I'll have to change the logic to use the PCs then... or make the client game state communicate with the server game mode...
thanks
radiant jolt
Could someone help me figure out why this isnt replicating
I went to two players and multiple things broke and I cant figure out why
Can clients not use event dispatchers?
winged badger
because you're using level blueprint
its not Owned by the client's PC
so it can't send a Server RPC
only MCs from Server are allowed for non-owned Actors
Owned = PlayerController, PlayerPawn, PlayerState, their Components + anything that had any of them set explicitly as Owner
lucid vault
Is player controller[0] always the local controller server-side with a listen server?
winged badger
yes, you should get into a habit of not using that function though
lucid vault
why is that?
winged badger
people mostly use it to create ridiculous cross-wiring bugs in their netcode
there are other ways to get the PC
simplest one is via c++ GatGameInstance()->GetFirstLocalPlayerController()
from Pawn its GetController(), from PS its GetOwner cast to PC...
from HUD its GetOwningPlayerController... etc
radiant jolt
Why is it that when I possess on the client the server also possesses?
winged badger
if that happens to you
you used GetPlayerController[0] hooked into a Server RPC
@lucid vault my point just made for me
lucid vault
haha
winged badger
@radiant jolt whatever is hooked into a Server Event, executes on Server - meaning GetPlayerController[0] is evaluated on Server, and it doesn't return the same thing as when its evaluated on Client
radiant jolt
im in bp tho
radiant jolt
ok
winged badger
its the same as for non-networked events
click the red node, goto details panel on the right, Add Input
winged badger
http://cedric-neukirchen.net/2017/02/14/multiplayer-network-compendium/ read that a couple of times
radiant jolt
so basically I want to get only the client PC
wtf I cant move now after the possesion on client or server
@winged badger I still dont understand how to fix my problem
oh nvm i got it
ty so much!
peak sentinel
so in a function if I calling GetPlayerCharacter(0); I should always replicate it to client if I want to get clients character?
because ue4 crashes when I call it on dedicated mode
twin juniper
Would anyone know why a connection would timeout when connecting to a server?
NetworkFailure: ConnectionTimeout, Error: 'UNetConnection::Tick: Connection TIMED OUT.
twin juniper
port is the default port 15000
gleaming niche
default port is 7777
gleaming niche
yeah well,if it's not connecting, there's only 3 reasons for why you'd fail to connect: 1) port isn't actually open (from router pointing to the server) 2) there is a firewall in the way, or 3) the address is wrong.
there may be a fourth, but i can't think of it at the moment.
i guess #4, could be that you're trying to connect on the port, that the server is not actually listening on.
twin juniper
I have my ports forwarded to 20150 and 7777
and the firewall one is interesting? I am slow in the head do you mean my own firewall or do servers have firewalls?
gleaming niche
anything can have a firewall, it depends on where your server is.
twin juniper
the address being wrong is plausible. but the address of my server when printed on the server logs returns my IP address which makes sense.
gleaming niche
ah right #5; the server is running locally on the same machine, and you're trying to connect to an external ip address.
locally on same machine / or on same network
twin juniper
yeah.
gleaming niche
some routers can intelligently forward that
so they redirect the public ip to lan ip
it's easier if you have a domain name you can use, because then in windows for example, you can modify the host file, and redirect the name to resolve to a lan ip
twin juniper
Okay thanks.
worthy knot
@twin juniper are you trying to connect to a dedicated server machine?
and yes i get the same timed out connection too
gleaming niche
if you're locally on the same network, and trying to connect to a public ip, ie: your actual internet address, this will fail.
unless you have an uber intelligent router, that magically can redirect public ip, that every machine on the network shares, to redirect to a lan ip
worthy knot
@gleaming niche So i have a windows server machine ready, and i copied and pasted my packaged project into it through remote desktop, i launched the server .exe shortcut log , and now i try to join the server machine by putting both the public and local IP with port 7777 but it wouldnt connect, Then i accessed the server machine through direct VPN, i then launched the server exe of the game through that, then put the VPN ADDRESS into the join domain info of the game , it joins, now i dont know if this is the correct thing happening, cause all the steam games join their servers via public IP i believe
my firewall is disabled btw
gleaming niche
if you're using steam, you should be using sessions. then it will connect via steamid, and deal with the NAT traversal through the steam sockets, and then you don't have this problem.
twin juniper
@worthy knot have you resolved your issue?
gleaming niche
with the exception, of not being able to host a dedicated server on the SAME pc as a client, as usual.
worthy knot
@twin juniper No regarding the timeout no, i need to look into that, but as of now i cannot join the server hosted game via IP
twin juniper
shitty. that's where im at.
worthy knot
Do you have your game folder inside the server machine ?
twin juniper
Yeah.
worthy knot
ok and you ran the server .exe shortcut ?
worthy knot
oh
i think this could be some port forwarding problem
do server machines have use different port?
gleaming niche
did you disable the firewall on the windows server machine?
or add exceptions, so it can open ports?
worthy knot
i did it right now and i will test
gleaming niche
it's been a while, but from what I can remember, windows server doesn't do the popup like normal windows does, so if you didn't explicitly modify the firewall, you'll get no indication that it needs to be
worthy knot
Do i need to put some other port number other than :7777?
worthy knot
im using the default UE4 one
twin juniper
I am using steam
gleaming niche
then no, only 7777 by default
steam is different
steam needs 27015 for the query port (to show up in session lists)
and then 7777 base port for actually connecting
you can of course change all of it on command line.
twin juniper
๐ค
gleaming niche
with steam it's super easy with sessions
cuz you just query, and join
and it will use the steam ports
and doesn't matter if server is on same network, cuz it can do nat traversal.
(as ong as it's not same pc)
since steam itself is running, it will connect via lan automatically
bitter oriole
No port setup is needed with Steam AFAIK
bitter oriole
Ah, alright.
gleaming niche
dedicated needs the ports open for whatever range you happen to be running, if you're going to run more than one DS on one machine / vm
worthy knot
Ok so i disabled firewall and joined via LOCAL IP , joined successfully
twin juniper
worthy knot
now heres whats confusing for me, Is Local IP or Public IP required to join dedicated servers?
gleaming niche
depends on where the server is lol.
if it's on your network, you need to connect with lan ip.
if it's a different public ip, you connect with public ip.
worthy knot
its not on my network, its a VPS
gleaming niche
and then it depends on if they are forwarding ports for you.
steam just makes it all easy lol
twin juniper
"easy"
worthy knot
haha
gleaming niche
if you use the sesions properly, it takes 10 minutes, i dunno what your problem is beefy, beecaue i don't know how you implemented anything.
or how you're trying to connect.
or how you're defining this different port of 10000
worthy knot
so this means i gotta see what port the server machine is using? then use that port with its public IP?
gleaming niche
for steam dedicated severs, it's as simple as
yourbinary.exe -port=7777 -queryport=27015 for first server
yourbinary -port=7778 -queryport=27016 for second server on same machine, etc.
and then you just find sessions in the client
and join session
and just make sure all the ports are open in the router.
for the server itself.
worthy knot
in mine and servers?
gleaming niche
and it will work over lan and internet
because steam will do the resolving for you.
worthy knot
I have yet to integrate steam sessions in my game and set the IP address of the server on steam, i will look into that asap, but before that i must test and confirm it the basic way of joining via public ip
gleaming niche
your issue is going to be because of ports not being forwarded to the machine, via public ip. if you can now connect to the thing over your VPN, then you can just proceed, and do the steam sessions and you should be fine.
worthy knot
you sure steam will recognize all the ports and join via public IP without an issue? cause i havent ever looked into this stuff before
twin juniper
gleaming niche
ah, you're using beacons, instead of just sessions.
twin juniper
Yep
gleaming niche
and your server is on the same network
so you're trying to connect via public ip
which won't work.
twin juniper
Well i've tried from a dedicated machine and that gave the same connect timeout error
gleaming niche
and was it forwarding the ports, on that dedicated machine? lol
twin juniper
How would i know that? lol
gleaming niche
well there ya go.
if you don't even know that, then i'm willing to bet that's the reason.
forget beacons and just use sessions, and your life will be happy.
lmao.
twin juniper
Obviously. We had it working before i included beacons.
and then i tried doing initclient
and its failing.
worthy knot
@twin juniper you are using steam sessions ?
@gleaming niche Tell me if i should proceed with a steam integration tutorial , are there any specific ports that i need to provide?
I just want the server IP to be up on the steam server list and when i search sessions, it should show the active server IP and i should be able to join it without a hassle ๐
peak sentinel
if you guys can help please look at there
https://answers.unrealengine.com/questions/984536/ue4-crashes-when-editor-play-as-client.html
marble gazelle
I suggest to not use GetPlayerCharacter if you know your character ๐ use GetPawn() on a controller, and cast it to your character class, way less error prone.
and check you actually have a pawn of course
worthy knot
Do i need my game uploaded on steam to get an app id for testing?
gleaming niche
you need an app before you can upload.
worthy knot
an app? like my packaged project?
gleaming niche
no.
a steam app + appid.
you need that before you CAN upload.
since depot is tied to the appid / steam application
worthy knot
by a steam app you mean the steam desktop application or some app inside steam like another game?
gleaming niche
are you able to log into partner.steamgames.com?
and you have an app, on the site?
with an appid?
if so, then you can upload.
worthy knot
yeah i am logged in
not sure what you mean by "app" application or a game
gotta hit this?
gleaming niche
yup.
worthy knot
Okay i got the sdk
So what am i supposed to do with this now? does it give an app id in it?
chrome bay
You need to login to the Steam backend, sign up as a partner and create an App. It's not free though.
gleaming niche
sorry i didn't pay attention to your red line
i mean i would think it's obvious, if your intent is developing a game.
worthy knot
Oh i need to sign up all the tax info and stuff just for the app id
$100 to create a new app, this can be used as my first video game title right, because thats the fee to publish every new title
chrome bay
yep
worthy knot
@gleaming niche Just a recap to the port openings, I need to add 7777 in one of these?
gleaming niche
Yeah under forwarding.
gleaming niche
wow huawei sucks.
worthy knot
why? is something missing?
gleaming niche
the ability to actually define a port
and not just pick from a list.
maybe you need to enable "advanced" mode or something in the router.
worthy knot
ill check if there is a setting
hmm no advanced setting
what router are you using?
gleaming niche
i have a few different ones. asus, cisco, etc.
worthy knot
and they allow to define a port?
gleaming niche
yup.
worthy knot
Lucky
i dont think the server machine needs port forwarding, cause i tried accessing the router homepage it wont load up ( well its a server machine so yea )
just my end that needs it
verbal gust
what is the best way to setup vr replication (so that users can see others) [tracked controller, teleport location, etc]?
urban palm
@verbal gust if you want a quick start to it, the VR Expansion Plugin by Mordentral has pretty much all the networking already figured out for you
verbal gust
thats annoying, just spent a week pondering over things i didnt need too, ty for pointer
gleaming niche
imo, that plugin is the best for VR stuff.
verbal gust
will have a look cheers
zenith wyvern
Can anyone tell me why get mouse position returns 0,0 every other tick on client in multiplayer?
its fine on server
Turns out get mouse position was returning false every other tick on client. can branch around it, but wondering why that would happen
fleet raven
are you running multi-PIE? if so, each PIE window is going to be ticking independently (obviously) and your mouse can only be over one window at once, so the others are going to fail to read mouse position that tick...
unkempt tiger
is using the DrawDebug___() functions serverside going to network the debugging call to the clients so I can see the serverside debug information?
for example DrawDebugSphere() etc?
meager spade
no
meager spade
that is how i have to do it
unkempt tiger
should have come ready with the engine
meager spade
well you can use Gameplay Debugger
unkempt tiger
what's that?
unkempt tiger
ah right, thanks, will do
meager spade
though that custom GD stuff
is old
i did have a tutorial on my blog (but i lost it) to create a new category
but its fairly simple
{
public:
FMyCustomDebugger();
static TSharedRef<FGameplayDebuggerCategory> MakeInstance();
virtual void CollectData(APlayerController* OwnerPC, AActor* DebugActor) override;
};```FMyCustomDebugger::FMyCustomDebugger()
{
bShowOnlyWithDebugActor = false;
}
TSharedRef<FGameplayDebuggerCategory> FMyCustomDebugger::MakeInstance()
{
return MakeShareable(new FMyCustomDebugger());
}
void FMyCustomDebugger::CollectData(APlayerController* OwnerPC, AActor* DebugActor)
{
AMyCustomPawn* MyPawn = Cast<AMyCustomPawn>(DebugActor);
if (MyPawn)
{
MyPawn->DescribeSelfToGameplayDebugger(this);
}
}```that is the basics ๐
then in GameInstance Init just do IGameplayDebugger& GameplayDebuggerModule = IGameplayDebugger::Get(); GameplayDebuggerModule.RegisterCategory("MyCustomDebugger", IGameplayDebugger::FOnGetCategory::CreateStatic(&FMyCustomDebugger::MakeInstance), EGameplayDebuggerCategoryState::EnabledInGame, 6); GameplayDebuggerModule.NotifyCategoriesChanged(); and voila ๐
unkempt tiger
oh neat
meager spade
then your custom pawn can show anything to the Gameplay Debugger
unkempt tiger
good stuff! this will come handy for my lag compensation scripts
zenith wyvern
@fleet raven was in standalone
lucid vault
What's the cleanest way to replicate num players
Is there a better solution than creating a duplicate replicated variable?
lucid vault
What's a good way for widgets / BPs to subscribe to changes in the playerarray length? I need some function that runs client-side when the playerarray changes, so I can use an interface to let everyone know
With replicated variables in the game state, I use onRep which in turn get's every actor/widget and calls an interface function to let them know of changes to that variable
winged badger
overriding Add/RemovePlayer in GameState and adding a delegate broadcast to it
is the cleanest way, c++ only
lucid vault
Is there any benefit to using a delegate over an interface?
I plan on moving my code over to C++. I've just been prototyping quickly in BPs
chrome bay
delegates are portable, anything can subscribe to it
interfaces considerably less so, and you somehow need your gamecode to be referencing UI widgets which is also not great
winged badger
and by "which is also not great" he means you'll regret it ๐
chrome bay
yeah ๐
Nothing less fun than trying to redesign a UI that has spiderweb code all over your project ๐ฆ
peak sentinel
Hey Jambax, i replied your reply on answers, can you check it out if you are avaiable?
nvm i misread it
solved now
lucid vault
Is it bad practice for the player controller to conditionally render widgets depending upon the game mode? Originally I had multiple player controllers for each gamemode, but the player controllers are mostly the same apart from widget rendering.
winged badger
yes, you have HUDs pretty much designed to do that
lucid vault
I was thinking about using the HUD class, but everyone kept saying it was outdated
I guess I could use a widget class called HUD
So, you would add a generic HUD class that is responsible for looking at the gamemode? Or you conditionally add HUDs based upon the gamemode in the PC?
chrome bay
yeah treat the HUD as a convenient manager for widgets
lucid vault
Should the HUD conditionally render based upon the game mode, or do you typically have separate HUDs for each gamemode?
chrome bay
different HUD for each gamemode, since the gamemode defines what HUD class is used anyway
But, I suspect most of the gamemodes still share a lot of common elements
lucid vault
I see, that makes sense. So, it probably makes sense for the HUD class to be the one that interacts with state, and it can pass the state variables down to it's widgets
chrome bay
Well not necessarily, widgets can grab info from the game too
But the HUD is a convenient place to store all your widgets and instantiate/manage them, since it's closely linked up with the player controller
But there's no need to route information through the HUD into widgets, if widgets can just grab the info themselves
E.g. our scoreboard might be stored in the HUD, but it updates itself
lucid vault
I guess I'm just coming at it from a React web dev perspective, where the display elements only get passed data and never directly read from the state
For instance, if a scoreboard widget wants to be re used for different game modes, it can't really get the game state directly
chrome bay
If you have a common gamestate it can, most scoreboards will likely be showing the same thing
E.g, a list of players, possibly sorted into teams, etc.
the advantage of widgets manging their own internal elements and what they display is that you can put them wherever you want and they "just work" without any dependencies on some other class
If your widgets are totally dependent on the HUD to function, then it becomes a pain when it comes to redesigning stuff, or if you want to reuse a widget elsewhere etc.
lucid vault
I didn't think about having a super class for the hud. That makes more sense now
chrome bay
Sorta depends really. I don't have any webdev experience tbh, I just go with what works for general game level stuff in UI too
I just tend to keep UI as separate as possible from the game-code. HUD/Game might control what is visible and when, but widgets control their own appearance and grab whatever info from the game they want to display. Avoids a lot of nasty tangling of code.
rich ridge
I have been watching this video.https://youtu.be/QuuRUzZcmGE
So I m very much interested how is this even possible to do even though fortnite has AntiCheat.
If I know how to hack then I can code to prevent this.
But I couldn't think of anyway to hack
And most of the hacks are from current season
lucid vault
Someone wants to make some hacks ๐
rich ridge
The hacker were able to bypass collision, twist the physics
Some of the hackers were like Barry Allen- The Flash
fleet raven
anti cheat is not infallible
chrome bay
Be amazed what people come up with
fleet raven
the vast majority of what EAC does is pattern matching
it will upload the signatures of everything people inject
if any of those are later verified to be a cheat -> all of them banned
chrome bay
This was one of my personal favourites we had to deal with at one point https://www.youtube.com/watch?v=2degQm1dZP0
rich ridge
This is ridiculous
chrome bay
MP is just a barrel of fun
rich ridge
Do you believe these hackers do have good knowledge of Unreal engine??
fleet raven
better than all of us here
rich ridge
Ohh
chrome bay
Problem with UE being "open" source, is it gives people a lot of shortcuts too...
chrome bay
yeah
rich ridge
Hmm, so it's fair to assume whatever game I m making now won't be immune to hack
chrome bay
you can garauntee it
fleet raven
unless you are exclusive to stadia
then people can still use neural network aimbots on the video stream...
rich ridge
Yes right
chrome bay
some dumb stuff like you see in that video you can protect against, we missed some pretty basic things at launch
rich ridge
All these hacks are from current season of fn
chrome bay
ah I meant the one I linked.. but yeah no idea with FN
I mean you would assume Epic has done everything they can at the game level to prevent obvious exploits, but you never know
chrome bay
The teleporting one was our own fault. the hit-reg verification was just a dot product.
So hacker could teleport a pawn to their location on the client end, shoot them, then send a hit to the server and it'd would be like "you're looking the right way that's fine"
So obvious when you look at it now
funny really
winged badger
that particular cheat is fairly common
rich ridge
Ok understand
chrome bay
yeah. really easy to protect against, but so common. Doesn't help that a lot of shooters are using the shootergame template as a starting point which has a less-than-ideal implementation
fleet raven
that cheat is only common because doing hit detection so badly is common
winged badger
it is ridiculously simple, just teleport the target infront of a gun just as it fires
fleet raven
overwatch is the only one that did it right
chrome bay
the fast sprint was because we put out a dev build with all our console commands exposed. ๐
GG WP
fleet raven
it's too hard to do it like them
chrome bay
Didn't they do a talk about their anti-cheat approaches? Like doing crazy memory stuff and whatnot
fleet raven
they do full server side hit detection and since they have fixed ticks and deterministic logic they can actually do latency compensation perfectly
unkempt tiger
lmao @chrome bay that video is golden
chrome bay
Ahhh right, yeh determinism helps a lot I guess
rich ridge
@chrome bay I get the problem statement of your hack, so how did you prevented it. I still didn't understand
chrome bay
Solution was to simulate the bullets on the server too.
unkempt tiger
I'm working with a fixed tick and deterministic logic, Im funnily enough just now setting up a hit detection script
rich ridge
Ok ok
winged badger
even a common sense check on _Validate would prevent most of it
chrome bay
yeah
rich ridge
Right
winged badger
like, is the Target hit location anywhere around where Server thinks the Target is?
chrome bay
We do fancier stuff now, but looking back it's comical how easy we made it for people
So obvious when you look at it
winged badger
no, they are game specific
rich ridge
Ok
fleet raven
assuming that's a custom system
unkempt tiger
it is yes
fleet raven
epic should finish their new network prediction plugin 
it has proper fixed tick systems
unkempt tiger
what are its features?
winged badger
4.29-4.40, its just around the corner
chrome bay
fixed-tick chaos and everything
fleet raven
well chaos is the least interesting part
chrome bay
yeah true
unkempt tiger
so whats the most interesting part?
fleet raven
it gives you a proper framework for predicted, fixed tick simulations
chrome bay
..unless your doing a lot of physics stuff, in which case very big news ofc
fleet raven
handling multiple objects and everything
rich ridge
And they are integrating it with GAS too.
unkempt tiger
oh man
what am i doing with my life spending months of work getting my shit to work
fleet raven
they are also making properly working physics prediction based on that and chaos
unkempt tiger
when that plugin is around the corner, and can solve all my problems
fleet raven
you can see it in the new fortnite season, vehicles are using it
unkempt tiger
link?
fleet raven
don't have one
chrome bay
fleet raven
ye
rich ridge
@fleet raven you mean fn using prediction plugin already??
fleet raven
yes
what do you think why this exists
they are making it for fortnite
the predicted physics vehicles is already live
rich ridge
Yes they told it's for fortnite, but I didn't expect to go in production soon
fleet raven
yeah the boilerplate in that video is big egg
unkempt tiger
like how does one even go about making a generic prediction system
fleet raven
but that's because the chaos API isn't quite there yet
he said it won't be like that
unkempt tiger
so
am I wasting my time trying to do this myself (well not exactly this, but my own private case of it, so less generic) for a game I plan to work on for the next 3 or 4 years?
chrome bay
The idea eventually IIRC, is to just determine what input and outdata there is, and the simulation itself
Without having to worry about how the netcode works
So unlike the horrific approach CMC takes where netcode is heavily interlinked with the simulation
And it's a pain to change anything
winged badger
even when it starts working, you'll have to be intimately familiar with netcode for anything but the 2-3 basic scenarios
its like that every time with unreal
unkempt tiger
is there a place I can read more about this prediction plugin btw?
fleet raven
if you don't have a deadline then yes you are wasting your time
unkempt tiger
smfh
rich ridge
CMC emits a lot of bytes and eats up alot of network bandwidth
unkempt tiger
hmm
so as to physics prediction
whats actually preventing us from using substepping and our own custom rewind/rollback solution for prediction?
lucid vault
Non deterministic physics
@fleet raven Will the new prediction system be that much better?
unkempt tiger
physics can be deterministic if we give it a fixed deltatime value though
fleet raven
yes
it will be good
they're also making a new character movement based on it from scratch and throwing the old mess away
unkempt tiger
so basically it comes down to our inability to manually call Engine->TickPhysics(Time)?
lucid vault
I've always wanted to enable players to push around physics actors. But it breaks with more than 50 ping, especially when multiple players are pushing on the same object
Is this new net code coming in UE5?
unkempt tiger
that scenario will probably always break
lucid vault
yeah, I wasted a ridiculous amount of time trying to get it to work
unkempt tiger
what were your approaches?
lucid vault
I disabled replicate movement and tried to apply impulse nudges to keep the physics synced up, but it never ended up working good enough
The best theoretical solution that I ended up deciding on was to locally simulate the physics actor on the nearest player, and to use replicate movement when more than 1 player is near that physics actor
I haven't implemented that yet though
With the first solution, I used a fixed timestamp and send along previous transforms of the actor, that way corrective nudges could be made
Didn't work out too well ๐
fleet raven
this scenario will work fine with the new physics prediction system
chaos can do selective re-sim
fortnite has no issues with multiple predicted player controlled vehicles colliding
unkempt tiger
how tho? if the local player is still some ticks ahead of simulated proxies?
signal lance
@unkempt tiger the local client is predicting other players around it by simulating ahead with their last known input.
most likely
cinder tartan
hey guys is https://docs.unrealengine.com/en-US/Gameplay/Networking/QuickStart/index.html outdated?
followed it exactly and got bulk errors even after using code samples
signal lance
this puts the simulated proxies in the same "time frame" so it can properly simulate collisions
cinder tartan
Severity Code Description Project File Line Suppression State
Error (active) E1696 cannot open source file "IDamageInterface.h" ForsakenAndForgotten C:\Users\Ty\Documents\Unreal Projects\ForsakenAndForgotten\Source\ForsakenAndForgotten\ForsakenAndForgottenCharacter.h 7
and a bunch of others
lost inlet
please don't randomly DM people
radiant jolt
how do I set variables to replicate?
lost inlet
in code or BP?
radiant jolt
Code
lost inlet
UPROPERTY(Replicated) above the property and then override virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override; to include the property, don't forget to call the Super
faint dock
#include "Net/UnrealNetwork.h"
radiant jolt
ty
wait now when I try to use something that replicated i get an error saying attempted to access missing property?
nvm its a bug reloading editor fixed it
radiant jolt
ty
unkempt tiger
@unkempt tiger the local client is predicting other players around it by simulating ahead with their last known input.
@signal lance Yeah, tho I still don't see how prediction can work in that scenario, since its fundamentally different than other scenarios (each client can affect every other client when everyone is pushing the same prop, the net latencies alone just make it seem impossible without solving the case manually with specialized netcode, I may be wrong though)
zinc garden
Hey, I have a hard time figuring out how to structure my BPs to get something to work. What I want to do is:
Player connects, becomes a spectatorpawn and gets a widget where they can enter their name. When submitted, that name is saved in their player state so that others can see it in the scoreboard. - So far, okay.
Then I want to spawn the character and have the new player possess it. - This is where I'm stuck
I can't talk to the gamemode directly from the widget, because the widget is clientside and the gamemode only exists on the server.
If I fire a serverside event on the playerstate, it's gonna happen for all players, so it will spawn a character for every player currently connected instead of just the player who submitted their name.
zinc garden
Fixed it ๐
signal lance
@unkempt tiger https://youtu.be/ueEmiDM94IE?t=2442
unkempt tiger
correct me if Im wrong (I havent played rocket league myself so I can't tell for sure, although I did see videos): there are two differences between rocket league and what @lucid vault described though, (which is a scenario where several players are actively pushing against the same prop). the first is that in most cases, rocket league's car-to-ball interactions are single events rather than a continuous dynamic system (I may be mistaken here, so please correct me) and this can make accounting for in the net code easier, and the second more important part is that usually, not more than one car is actively pushing the ball at a time, right?
im thinking out loud here more than anything else
so the pushing car has all the data it needs to know where the ball is going next, upon impact
Oh, there we go
He explains that this doesnt work very well with other cars
lucid vault
The ball also seems much more predictable
analog rover
Re: network prediction, has anyone here used it for anything outside of the examples?
I was mostly digging through the mock simulation examples out of curiosity, since trying to implement anything with it in my project would probably not be worth it
unkempt tiger
are you talking about the current prediction solution ue4 provides atm?
analog rover
Nah, the new Network Prediction plugin
bitter oriole
Some people have been using it here though it's still experimental
analog rover
I saw someone mention that FN is using the plugin for their vehicle sims though
Oh neat!
I guess I was wondering how experimental it is, though according to the update notes it seems like the API is mostly set for now and most core features are done
bitter oriole
That's probably true
analog rover
I'd definitely be interested to see if they provide some more fully-featured examples/documentation with the full release or whenever they merge CMC functionality into the plugin (whatever year that ends up being ๐ )
bitter oriole
Provided they actually do that
analog rover
You're thinking they won't change the CMC?
bitter oriole
Yeah
It's an immensely complex feature that you can't really change much since like 90% of UE4 projects use it
Probably including Fortnite itself
Definitely including every shooter under the sun
analog rover
Yeah, that would definitely be a big change. I know they stated a desire to replace CMC (I think that might even be one of the main goals) with it at some point, but I suppose we'll have to wait and see if they actually do
bitter oriole
I think a generalized Pawn movement with network physics would be incredibly more valuable tbh
analog rover
Yeah, I can see that
I didn't actually realize they were working on generic networked physics
bitter oriole
Chaos is very much meant for network
Right now you just can't have server-authoritative vehicles in UE4
analog rover
Are the networked vehicles coming in 4.26? Or is that just single-player vehicles?
(I saw Chaos vehicles listed on their Trello for the 4.26 release)
meager spade
they seem to be tested well in Fortnite
so im hoping they release something
also i spoke to a few people and got told the CMC is not going to be removed/changed, but a more generic framework will be useable including a new client movement system. Hopefully this is more encapsulated, and not needing to be hardcoded to use the PlayerController/ACharacter to do everything
analog rover
So just something new alongside of the CMC, but keeping the old one for legacy purposes?
sweet robin
I'm having an issue with the Steam Subsystem where once 2 people are in a session, the session can no longer be found. On the NULL subsystem I can have any number of people join, no issue. I've got my NumOfPublicConnections set to a good number.
The issue also arises if someone joins, leaves, then tries to rejoin. It's like the session can't be found after the first connection.
unkempt tiger
by CMC you mean character movement component right?
analog rover
Yeah
steel vault
I would hope that whatever solution they end up coming up with would be easily usable in place of/with the existing character classes so that you don't have to incorporate a Pawn instead or rebuild everything to get your characters working with the new stuff.
Would be nice if it had an easy way to replace the CMC if you so wish
I for one, am super amped about Chaos and properly simulated net physics because my game is supposed to have a ton of destruction and physics in it.
lucid vault
'GetDefaultPawnClassForController': illegal qualified name in member declaration
Why is this ๐ค
sweet robin
I found my problem:
LogOnlineSession: STEAM: Updating lobby joinability to false. Any idea where the steam interface would be doing this?
sweet robin
I found this:
// Auto update joinability based on lobby population
bool bLobbyJoinable = Session.SessionSettings.bAllowJoinInProgress && (LobbyMemberCount < MaxLobbyMembers);
UE_LOG_ONLINE_SESSION(Log, TEXT("Updating lobby joinability to %s."), bLobbyJoinable ? TEXT("true") : TEXT("false"));```
But I'm curious why that bool would become false? Obviously it thinks I'm hitting the MaxLobbyMembers. But when I create the session I'm setting my NumPublicConnections to a decent amount.
ripe lotus
Hello guys. I have a replicated actor that i need to move on a dynamic patterns that changes over time.
The actor is not a pawn (nor character).
So i resorted to overuse the SetActorPosition (and some VInterpT and RInterpTo) but the replication is super weird, jumps back and forth all the time.
Is there a better way?
prisma crescent
There's the movement component and InterpTo components you can use
Haven't used them myself
steel vault
Usually if you have jumping that means the client position does not match the server position
unkempt tiger
I for one, am super amped about Chaos and properly simulated net physics because my game is supposed to have a ton of destruction and physics in it.
@steel vault What are your planned alternatives for Chaos?
or rephrased
assuming chaos net physics isnt a thing, how do you plan on networking your physics?
steel vault
I have purposely held off on creating destructible actors and replicating the movement of a lot of actors on screen for this very reason because I was hoping to have a plug and play solution like chaos. That being said, I currently have a handful of movable actors on screen that when I impulse follow pretty closely to what happens on the server so I would probably implement a very generic/basic interp of the location and rotation client side on a slower frequency to eventually match what the server sees. Albeit, not the greatest solution. Or I did read something about lock stepping that might work better.
vagrant saddle
would you use the client's frame time when calculating it's velocity on the server?
unkempt tiger
whose velocity?
vagrant saddle
character you're controlling
unkempt tiger
character velocity should be independent of frame time
steel vault
I believe the CMC on the server provides that value for you
unkempt tiger
it should be frame-time-integrated when simticking though
vagrant saddle
I'm not sure what frame-time-integrated means or simticking but I'll look into it
its just the way we originally designed the movement was framerate dependent
and I'm really not sure how to translate that to a server
unkempt tiger
why do you want to calculate the character's serverside velocity on the client?
calculate it based off of what?
prisma crescent
It does not look like Chaos destruction has any networking in it.
vagrant saddle
when the player gives it an input it makes an acceleration vector that's used to calculate the characters next velocity, like how they do it in source and quake. So, our movement calculates this every frame and it was frame rate dependent to keep it consistent, but now I have to get this to work with networking and I'm not sure how the server should be handling this
ripe lotus
Thanks guys, i've avoided the interpto movement because i need to reset the target each frame.
i have the feeling the jumping is due to that. by changing the target each frame, the interp steps on its previous interp. or maybe is the clients prediction.
prisma crescent
Server shouldn't have to do any prediction. That should all be handled client-side.
vagrant saddle
Sure, but I'm afraid of doing this client side because wouldn't that mean the client has to send the server what it thinks its next velocity should be, giving way to cheating?
unkempt tiger
@vagrant saddle "and it was frame rate dependent to keep it consistent" makes no sense, frame rate dependent code means keeping things inconsistent
ripe lotus
@prisma crescent yup i'm talking about client prediction. the movement on the server is fluid, but on the client its like jumping back and forward quickly
unkempt tiger
but anyways, it seems like your problem is your application of velocity += acceleration and position += velocity is not properly time integrated @vagrant saddle
those should always be integrated
vagrant saddle
What do you mean by integrated here?
unkempt tiger
it'll explain things better than I could
but in a nutshell - you integrate your motion so that your logic is framerate independent - the better the integration method, the more independent it is
if you're doing what source did, then you should fix your time steps
vagrant saddle
I'll read up on it, but I wish I could explain why I made it frame rate dependent lol
unkempt tiger
you probably made it frame rate dependent because its the easiest way to go about things when prototyping shit
you just dont have to worry about integration and all that stuff
unless you had another reason