multiplayer

[vast forum]

Just giving an update, for posterity: I was calling MyRpc not MyRpc_Implementation

No error, no complaint, just a silent error :/

*Although I'm getting some weird stuff where calling _Implementation directly appears to still be calling from the Client, not the Server, so maybe I'm still stuck 😦

Yeah just confirmed I'm dumb :/

[chrome bay]

Yeah you're not meant to call the _Implementation version

If you call _Implementation it'll just run that code on the client, which isn't what you want

[vast forum]

Yeah I see that now.

[soft jewel]

Hi guys, I would like to know whats the best way to replicate animations from the state machine and montage animations. Thanks 🙂

[winged badger]

via Pawn

you want animations to prepare everything during BlueprintUpdateAnimation

and AnimationGraph to just use the variables from the AnimBP prepared in advance

as that is only situation where your animations will run off game thread

UAnimInstance isn't replicated, and is not net addressable

[manic agate]

Quick question: if an object is spawned on the server at runtime, is it ALWAYS replicated to every client, even if the spawned object is set NOT to replicate?

[meager spade]

no

[manic agate]

I thought as much, but why is it happening to me? 😦

[meager spade]

cause maybe you are spawnig on client and server

or maybe its secretly replicated.

[manic agate]

Yeah, I'm spawning both on the client and on the server, so the object appears 2 times

But it shouldn't be, because I marked the actor as "not replicated" (also on the constructor)

The actor in question is just a BP class that inherits from Actor, I don't think there's nothing weird going on behind the scene

The spawning itself occurs on another BP class that inherits from Actor, which is also marked as "not replicated"... so I don't get what I'm doing wrong

[merry hemlock]

https://youtu.be/TbaOyvWfJE0?list=PLZlv_N0_O1gYwhBTjNLSFPRiBpwe5sTwc&t=455 is this still valid (I'm using VR )

I'm specifically looking for now to turn off VR in the second game - because Steam VR seems to think the very moment I start up the exe, it's supposed to inject VR onto that - so even if I code in my BeginPlay, if not server, disable VR and use non-vr pawn, it still doesn't seem to want to work

[winged badger]

i'd try sending it via login options string

have the GM instantiate different PC class in response

[merry hemlock]

I just want to test this as simply as possible, without building much of the framework - if I can do it in a shortcut target, that would be simplest

because I'm not certain if using local multiplayer is going to work for my UI purposes or not, so I don't want to waste time building functionality only to discard it later

What's wrong with the syntax here?

[bitter oriole]

The http part

You're not opening a website

The port is also not useful

[merry hemlock]

Thanks, I realized I had changed one of the folder names and invalidated the shortcut as a result - had nothing to do with syntax but your confirmation helped me realize that

[merry hemlock]

How would I make these run in a .bat file (I need to open up both exes at the same time so Steam VR doesn't inject into the 2nd one and close the first)

[bitter oriole]

Launch one and then the other I guess ?

[merry hemlock]

not sure on the syntax for windows to use the shortcut launch parameters but doing so in a batch file

[bitter oriole]

I never wrote batch files, sorry

Python is a more 2021 approach to things

[manic agate]

Hey guys, I'm still having trouble with my problem... basically, I've got his Actor which does the following:

The spawned class is NOT replicated

Nevertheless, the above code when executed also spawns the object on each client

Can anyone tell me why is it happening?

PS: also the actor that is causing the spawning is NOT replicated

[meager spade]

and how is the actor that is spawning it created it?

[manic agate]

It's placed in the level

(manually, that is)

[meager spade]

so if its not replicated

then the client has authority over it aswell

change your HasAuthority to Is Server -> Branch

[manic agate]

You're a genius

Let me try 🙂

No that's not it 😦

I've also made the actor in the level not "net load on client", so the above code is always only executed on the server

Yet, the object is still spawned in the client as well

Is it even possible? Why is it always replicated?!

[meager spade]

why is it not net load on client?

that is why its breaking

[manic agate]

Nono, I meant I only did it as further test

[meager spade]

right

[manic agate]

Just to ensure that the code was being executed only on the server

[meager spade]

i have no clue, then. That is strange behaviour, but without fully seeing your setup, i am out of ideas

[manic agate]

I totally understand, thank you 😦

I've actually tried with a new project from scratch and setup this example... there it works, so there's really something wrong with my setup... It seems that one of the component present in the spawned actor is the culrpit, somehow, so I'm trying to remove them one by one to find out what's happening 🤔

If a component sets in its constructor to be replicated, does it force the Actor to be replicated as well?

[meager spade]

no

[manic agate]

Got it, something bad is probably happening behind the scenes in the C++ class of a component

[quasi tide]

Workin' on having the client be able to pick up an object on the ground and equip it.

Object has an interface, when player is over it, they press the interact key, it checks for that interface and then calls a Run on Server event that calls the interaction method for the interface. So, now I'm in server land.

In the server the interaction object calls an equip function on the player. The equip function is not replicated or anything like that. It spawns the actor, sets the owner to be the player, updates the currently equipped weapon (which is an OnRep variable) to be the newly spawned weapon, then attaches it to the player. Afterwords, it destroys the old weapon.

(Weapons are replicated)

That's all that happens in the flow. Everything works as I would like it, but I'm confused on one part. How is the server able to call the function on the player? The player isn't supposed to be controlled by the server, right? Or is it because the server has the ultimate authority regardless of what happens? So the server equips the weapon and runs the logic on the server and replicates the weapon stuff to client?

[winged badger]

not controlled by the server = server can't run input on it

it can run everything else just fine

and then it replicates

[quasi tide]

So - it's expected that the server can run a function on it though? It just can't run input?

[winged badger]

yes, its how server auth works

your flow is good

when you spawn a weapon and attach it

the weapon actor is replicated, and so is its attachment

so on client, it spawns in the character's hands

or w/e

[quasi tide]

Alright - I was just thinking that because the player is owned by the player controller, which is owned by the client - I wasn't supposed to be able to run a function. I thought I would've had to do a Run on Owning Client thing.

But this is good to know.

[waxen nexus]

Anyone know how to fix:

Task "Exec" skipped, due to false condition; ('$(NMakeUseOemCodePage)' != 'true' and '$(NMakeBuildCommandLine)'!='') was evaluated as ('true' != 'true' and 'D:\UES_4.26\Engine\Build\BatchFiles\Build.bat PROJECT Win64 Development -Project="D:\PROJECT\PROJECT.uproject" -WaitMutex -FromMsBuild'!='').

Development Server build config seems to run fine... then doesn't build server executable...

[edgy jacinth]

I am trying to achieve the following:

From an array with ParkingSpot Objects, I randomly pick an element and will tell that element to destroy its child actor. How do I make sure that the server and the clients all pick the same element?

[quasi tide]

Only do it on the server

[edgy jacinth]

If I run it on the server only, it doesn't seem to actually destroy any actors though.

[quasi tide]

So it doesn't work in offline or listen server mode?

[edgy jacinth]

It does, but if I pick a number it does destroy the actor on the server, but not on other clients

[waxen nexus]

Gotta make sure the server has ownership of the actors in general. When you spawn the actors in the first place, it should happen on the server and then be multi-casted/replicated to the clients. Then, when you destroy them on the server (if they're set up correctly), that happens on the clients as well. May need to multi-cast the destruction, depending on what you're doing.

[winged badger]

you just SetLifespan

if you want it destroyed few seconds later

[edgy jacinth]

I think the reward for most stupid person can go to me, my dumb brain forgot to set the actor to replicate smh

Big brain moment

[waxen nexus]

haha. I was gonna say that, but I figured no one misses that for too long, lol. Then I had to think of the shortest way to say all of the other stuff 😛

[edgy jacinth]

No worries, luckily I'm known for such brain farts haha

[upper parrot]

Hello, any good tutorials about multiplayer? Basic communications like server respawn a cube for player world. Add player to server etc?

Also request information calculate the player dmg based on the sword damage value?

[quasi tide]

Plenty. Personally, I still think this is a good start: https://www.unrealengine.com/en-US/blog/blueprint-networking-tutorials

Then from there you should have a decent enough understanding of the theory and all that.

You can always just follow a series on YT as well

Also read eXi's network pdf as well, it's expected that you have and understand it

https://cedric-neukirchen.net/

It's going to take some practice for these concepts to sink in though.

[dark edge]

@quasi tide one thing I would change is to have references go one way. Character knows about Equipment. Equipment doesn't know about character.

[quasi tide]

I pass a reference to the character to the interacting function.

[dark edge]

That will certainly work but you can get some quite brittle code keeping that pattern up. I wouldn't worry about it for now but keep it in mind.

[quasi tide]

Yeah I'm aware - I just haven't been able to figure out how to do it the other way. Other than that part, everything is set up to be the way you described.

[dark edge]

I just cast it to BaseEquipment and if it's Equipment, do the equip etc

[quasi tide]

So you do the interact, then in the interact method for the equipment, you just cast to the base equipment? 🤔

Huh? I'm confused.

[dark edge]

In my case interaction is handled by a component. That component stores State about whether or not the thing is currently able to interact. I filter by that Boolean when selecting which object in radius to interact with. If the selected object is equipment, I then just equip it.

So I never actually call interact on pickups. I suppose I could, and have that set some state or whatever but I don't really bother

You want to have some sort of CanCurrentlyInteract boolean somewhere otherwise someone else could just walk up and equip the gun you're holding lol

[quasi tide]

Right - already handled 👍

That said - it would be friggin' hilarious to see.

[dark edge]

My first test of equipment I forgot about that. You could steal each other's guns

[quasi tide]

hahahahaha

[meager spade]

i went with a seperate pickup actor that is just a C++ class, but it takes the pickups WorldItemDefinition data asset, and constructs the pickup

so i can spawn a pickup of any world item, without needing to make different pickup bp's

[quasi tide]

I just use the same BP.

[meager spade]

all items are based on WorldItemDefinition data asset, each item is a seperate data asset

[dark edge]

How do you deal with visuals/layout like particle effects and mesh offsets etc?

[meager spade]

in the world item definition

[dark edge]

But are those written out or are you able to visually place things?

[meager spade]

i mean you have to put them in manually, but my pickup does do some auto adjusting to make sure its properly on the surface

    {
        if (WorldItemDef->PickupSkeletalMesh.IsValid())
        {
            SkeletalMesh->SetSkeletalMesh(WorldItemDef->PickupSkeletalMesh.Get());
            StaticMesh->DestroyComponent();
            PickupCollision->AttachToComponent(SkeletalMesh, FAttachmentTransformRules::SnapToTargetNotIncludingScale);
        }
        else if (WorldItemDef->PickupStaticMesh.IsValid())
        {
            StaticMesh->SetStaticMesh(WorldItemDef->PickupStaticMesh.Get());
            SkeletalMesh->DestroyComponent();
        }

        if (WorldItemDef->PickupParticleEffect.IsValid())
        {
            PickupParticles->SetTemplate(WorldItemDef->PickupParticleEffect.Get());
            PickupParticles->Activate();
        }
        else
        {
            PickupParticles->DestroyComponent();
        }
    }``` for example this part of the code for setting the correct mesh and playing particle

this needs cleaning in another pass

but its all proof of concept atm

[dark edge]

It's be cool if there was something like the BP editor that can read/write to arbitrary data. I have another project that is a build-by-parts vehicular combat game and although I'm using VehiclePart=Actor, it would be nice to be able to have VehiclePart=array of components.

[meager spade]

still have this to incorporate, just not got enough time

(pet project, separate from work :D)

[dark edge]

But I'd have to do all the 3d placement by guess and type vs just moving things around

[upper parrot]

I will take a looking thank you for the help. Is knowledge of c++ required? As I don't know to much of that. Can do it in BP?

[dark edge]

I think he's talking about a more data driven architecture, which can certainly perform very well and be very easily extended, but it's total overkill if you're just making your first pick up shooter

In a system like his, changing an item or a pickup or a weapon would just be changing data in a table, no need to go in and modify blueprints etc

[upper parrot]

I want to do some stuff advance. But not to advance just need the basic all the tutorials I found on yt. Have complex c++ parts and BP setup to communicate with own servers language

[quasi tide]

Baby steps my friend, baby steps.

[upper parrot]

Would be very happy in create a cube that spawn to every players

Not just in local servers or lan

But for now just looking for the basics I can figure the rest out as the logic is almost the same I guess. For example weapon pickup. Spawn that item in location, replicate for all players see, and that weapon if picked add to player inventory

[dark edge]

Do items always exist in the world or can they be stored as just data?

[upper parrot]

Imagine supplyment

Item dropped randomly

Or after X minutes game starts

[dark edge]

I mean can they be unequipped and put in a backpack or are they always visible in 3d and never "stored"?

[upper parrot]

Or on a player kill weapons can be picked up. Different events but the basic is always the same have that item show in player and server

Visible

Well for me to understand all basic some tutorial for item dropped for all players to see. Can be a cube haha

[hybrid zodiac]

Hi everyone, I have an issue with certain flags on my player state class not being preserved during seamless travel. My understanding is that player states by default are saved across to the new map. Should this not mean that any custom attributes I have defined on my player state class should also remain as they were at seamless travel? I am also preserving the player controllers in my game mode class

I have a simple boolean on the player state determining if that player is a server admin or not, but I'm finding after seamless travel that admins lose their privileges

The boolean is replicated to owner only, not sure if that has anything to do with it

[soft jewel]

Hello, I am using a Set Actor location and rotation node and after that i am playing an animation, It works good on the server but the client sometimes doesnt get the right rotation. Also the server and other clients can see him on the right rotation, anyone knows whats the issue? Thanks

[dark edge]

@soft jewel do you have actor movement replicated?

[soft jewel]

Yes, also I checked replication on character movement component if that makes any difference and SetActorLocationRotation node always returns true

[craggy void]

I believe you need to implement CopyProperties on the playerstate. It's called on the old playerstate and the new playerstate is passed as an argument

[hybrid zodiac]

@craggy void Awesome, thank you!

Just curious: my understanding was that the benefit of seamless travel was the ability to preserve the objects during travel, or is that not correct?

Not sure why properties have to be copied over if it's preserving the actors

Or is it just a special case for player states?

[craggy void]

It is, but you do need to specify what you want to transfer

[chrome bay]

new player state actors and controllers are spawned when you seamless travel

[hybrid zodiac]

Thanks :-)

[tight robin]

is there a way I could make a game ONLY use steam networking with a launch flag or something? I want to know if I could roll my own custom networking AND steam in the same build that can be changed in settings

[bitter oriole]

Define "Steam networking"

And "custom networking"

[tight robin]

"Custom networking" is default IP GameNetDriver with custom OnlineSubsystem, "steam networking" is the SteamNetDriver and OnlineSubsystemSteam. These are the two I would like to be able to switch between.

[twin juniper]

oop

[bitter oriole]

You should be able to toggle between both of these in a build, yes - AFAIK none of this gets stripped during packaging, and so the .ini changes for either service can be replicated in .ini in /%LOCALAPPDATA%/GameName/Saved/Config

[tight robin]

I know it's stored in the config files, how would I go about doing this? Can I just set the right string to a variable that has the Config option and then reboot the game?

[bitter oriole]

You probably need to reboot the game (or tell the user "will change on reboot")

But yeah

[meager spade]

i think the -nosteam flag works aswell not sure

[tight robin]

thanks much, I'll try both. Will report back if I find out how -nosteam works

[twin juniper]

I have this weird issue where this attachment works but also does not work

it even still persists after pausing the process

in game it comes and goes

I tried checking for attach parent on tick it doesnt seem to change

I tried both attaching it on the server and the client and both at the same time as well

any ideas would be appreciated

problem still exists on blueprint as well

in the viewport if I manually attach it as well

[twin juniper]

never mind

https://cdn.discordapp.com/attachments/671063175285833813/832010106606059530/unknown.png

problem was this

Im not sure if this is a bug or not

Hair was using different skeleton than the master mesh

so when I changed its parent and attached it to socket

it kept flickering anywhere in editor

removing master pose fixed the issue

[tranquil yoke]

Which events should be reliable, which will will run on clients ?

[dark edge]

@tranquil yoke Only those that absolutely HAVE to happen

[tranquil yoke]

no i mean, is it the RunOnServer or RunonClient

[gleaming vector]

hey @twin juniper can you please not post NSFW models to this discord? thanks

[drowsy arch]

why does this not work over the network?

if (GetLocalRole() == ROLE_Authority) {
        TArray<AActor*> OverlappingActors;
        ExplosionSphere->GetOverlappingActors(OverlappingActors);
        for (AActor* Actor : OverlappingActors) {
            if (Actor) {
                if (ASteamNetworkingCharacter* Character = Cast<ASteamNetworkingCharacter>(Actor)) {
                    Character->GetCharacterMovement()->AddForce(FVector(0, 0, 100));
                }
            }
        }
    } 

[drowsy arch]

i'm trying to add a force to an actor through another bullet

but it doesn't move

[somber glade]

I'm trying to cache the velocity of an actor prior to a hit. I've done some googling, and this is something people have complained about before. At the moment of impact the velocity is changed, so you can't get it at that point because it won't be the "real" velocity that was leading up to he impact. It'll be the velocity that results from the actual collision which pushes one or both of the actors in another direction. I'm doing this because I need to calculate which actor initiate a hit. One solution I saw was to put a collision sphere that is slightly large than your hit sphere and when the other unit entered that collision, cache your velocity at that time and save it for the coming hit. Great idea, getting a weird result in PIE.

Current hit sphere radius is 10, overlap sphere radius is 15 (CCD is on for overlap sphere). Client Actor is moving, server actor is sitting still (listen server scenario). I've got the on hit and the on component begin overlap only running on "is server" so that the host runs this calculation.

I put break points on both the on hit and on begin overlap. Here is what happens when the client runs into the server actor:

1. the servers actor hits the begin overlap break point
2. the servers actor hits the on hit break point (his velocity is properly cached)
3. The clients actor hits the on hit break point
4. The clients actor hits the begin overlap break point (his velocity is cached, but only after the hit has processed so the hit uses 0,0,0 as his velocity).

The actors are identical. Why is the onhit triggering for both before the overlap triggers for the client?

is it simply a matter of "lag"? it looks like if I increase the overlap sphere to a radius of 25 both overlaps will trigger first, but it's a bit bigger than I'd want.

[stable swift]

hey anyone got a quick idea why my player character falls through my procedural mesh terrain (looks like it almost collides) when running as a client. When in single player it works fine. I have CCD enabled, owner set, terrain mesh set to collision dynamic, moveable etc

if anyone got a quick direction push that would be awesome, this is getting annoying

[soft jewel]

anyone knows why SetActorRotation not working on client? Works good on server

[craggy void]

Does it work in single player? I believe AddForce is used for a continual force. Considering that you're using it for an explosion, you might want to use AddImpulse instead

[twin juniper]

Sorry won't happen again

[gleaming vector]

awesome thanks

yeah, i was able to tell that wasn't the intent, but we have people who use this discord from work, so block it out next time

or use the mannequin model when posting for help

[thin stratus]

Anyone faced this on a Client before?

[2021.04.15-09.38.16:346][ 94]LogNetPackageMap: Error: UPackageMapClient::SerializeNewActor. Unresolved Archetype GUID. Guid not registered! NetGUID: 1095.
[2021.04.15-09.38.16:346][ 94]LogNetPackageMap: Error: UPackageMapClient::SerializeNewActor Unable to read Archetype for NetGUID 11380 / 1095
[2021.04.15-09.38.16:346][ 94]LogNet: Warning: UActorChannel::ProcessBunch: SerializeNewActor failed to find/spawn actor. Actor: None, Channel: 308
[2021.04.15-09.38.16:840][119]LogNetPackageMap: Warning: InternalLoadObject: Unable to resolve object. FullNetGUIDPath: [1095]NOT_IN_CACHE

Our enemies fail to spawn on the Client at very specific stages/repro steps.
This is 2x Standalone, so no different build version or stuff like that.
Same client, when reconnecting, gets the Enemies spawned (without closing and opening the process again).

[winged badger]

@thin stratus is the class loaded?

and packaged for client

[thin stratus]

Class loads fine in other situations. This is standalone, not packaged.

[winged badger]

i don't know how the engine handles the situation where it has to load the class in order to spawn an actor from replication

if it has a large dependency map... might fail

and the load would had been requested, so it would be around for reconnect

[empty axle]

I know that in some previous versions it was synchronously loading the class if it was not there

but that was like 4.21

[grave notch]

i have uobject that spawns actor on construct if its dedicated server, spawned actor replicated so everyone can see it, and after i spawn actor, i set his pointer (or its reference) into variable (in that uobject), variable is replicated (its all happening in dedicated server only), but after that on clients variable is empty, what im doing wrong with this logic?

[winged badger]

i don't recall any callbacks to handle async loading there

that UObject is not an Actor or ActorComponent?

[grave notch]

its not actor

not component

[winged badger]

then it won't replicate out of the box

[grave notch]

but i have variable replicated on it, doesnt it work?

[winged badger]

the object itself has to be replicated too

[grave notch]

oh, i didnt know that

[winged badger]

replicating a pointer will not replicate the object

it will just send a NetGUID which clients can or can not resolve

[grave notch]

i just dont want to use actors cuz its heavy

[winged badger]

nod

well, you actor will need to replicate that UObject

ActorComponents are UObjects that replicate, so you can check their code or do some googling on how to do this

you cannot do it with blueprints

[grave notch]

in theory after i spawned that actor on dedicated server, cant i just save him into variable but locally for each client, without replicating that variable, but the problem is to get pointer to that spawned actor, because locally you have replicated version of it

[winged badger]

have it register with something thats easy to find

or just toss a pointer to it in gamestate on server and replicate that

[old echo]

For Multiplayer Shooter game which would be best way for firing bullet? Line Trace or Actor Projectile?

[bitter oriole]

Depends on the game

[old echo]

for PUBG like game

[eternal canyon]

still depends

but also remember

Projectiles can be a lot trickier to predict as you would need to find tricks depending on the projectile, Unreal Tournament also Shows off lag comp for projectiles btw

[old echo]

Will there be any performance issue? I'm worried about performance

[meager fable]

Are there any dangers of incresing bandwidth? It's defaulted to 10KB/s that seems pretty slow looking at modern internet connections

[bitter oriole]

Projectiles only make sense for very slow bullets.

[livid seal]

Are trying to get more realism than a simple line trace? I only ever recommend actual projectiles if you want the ability to dodge the projectile. Bullets travel so fast that no one can ever react in time to dodge them, so line traces are recommended.

I have made a custom Bullet Trace function for the UniversalMonster asset. You could do something similar too. I can customize how many traces to do, over how much time, how much gravity and wind will affect it, etc. It is an instant trace, but calculates the bullet path as if it travelled the number of seconds you choose.

[old echo]

Can we apply physics to Line trace(I know its impossible but...)

[livid seal]

You need to do what I mentioned above, hehe

A single line trace only goes straight

[old echo]

Yes more realism

[livid seal]

But if you do a bunch of line traces, you can have the direction of each change

[livid seal]

See this for an example:
https://www.youtube.com/watch?v=w23h93w-q8I

Shooting into 50mph wind to the left and bullets are affected by gravity.

Every bullet is completely customizable too, with velocity and drag, etc.

[old echo]

Thanks, I will use Line Trance, this is what I need.

[livid seal]

You will still need to setup the process, like I have, but you can also purchase UM if you want. Either to use or grab the code from it.

Multiple shorter line traces is the key. My default is 100 traces per bullet (of course it does less because it hits before all traces are done). Line trace itself is pretty inexpensive, but it can be lowered to about 20 traces with good results if performance is affected.

[old echo]

100 trace/bullet isn't it too much for a AR gun

[livid seal]

Then I add in randomization for drag and wind since in real life your bullet will not have constant wind its entire path.

[livid seal]

You will have to play with the numbers which is why I made mine customizable. I can set it to 1 trace if I wanted and have it trace straight lines again, haha.

You may want more like 20 traces, which still looks good with gravity and wind.

[old echo]

Thanks man, have a nice day.... Now mission Line Trace....LOL

[thin stratus]

Yeah, I hard-reffed the class in the GameInstance now, just for sanity, and that does indeed fix it.
I always thought that loading a class in the Server and spawning it would force the Client to load the Class too. Maybe it does, maybe not, not sure. It does not work in some scenarios at least.
Not sure yet what to do about it. Can't hardref all the Enemies :D

[winged badger]

no, but you have an idea what you're going to be spawning

can just do a single OnRep (say gameplay tag container, tags used as keys for soft class pointers)

and have the client load the classes from OnRep

[quasi tide]

I have an interesting problem that I haven't the faintest idea on what causes it. In editor testing - my in-game UI works fine (crosshairs, ammo count, etc..); however, in a packaged build (debug, dev, or shipping) it does not. The UI simply isn't there. I checked the logs and saw nothing about not being able to create the UI or casting failing or anything of the sort.

I am having the player controller create the widget, then saving it as a variable and passing it to the pawn that it takes over in begin play. I then wait for a custom event from the pawn called On Ready.

In the pawn's begin play - I go through a has authority check and if it is server, spawn the starting weapon, equip it, then send out the On Ready event. If is a client - I just send the On Ready event.

When this happens, the PC then sets up the UI (configuring the ammo count for example) and then adds it to the viewport. This process works as expected and as desired in editor, but not in any packaged build.

Last night - I was trying various things and what ended up working in a packaged build was if I add the widget to the viewport directly in the PC, without waiting for the On Ready event. Because of this - it leads me to believe that maybe, something is going on with the networking side that is causing the PC to fail to respond to the On Ready event. And inside of this response is when I add it to the viewport. I tested this theory again with some lovely print statements, and indeed - the response was never firing off.

Does anyone have an idea of what is happening? Is it a race condition? It would make sense, and I thought about that when building it out, but it even happens when you are the only one there and you're the listen server.

[drowsy arch]

right now it seems to be something with the overlap. i ue_loged in the for loop and it wasn't going off. i even put it in the tick function.

[exotic badger]

Gonna go ahead and repost my problem from the blueprints channel because it does have to do with multiplayer and might fit better here

So here's my problem, I mean you can see it in the video but still. When I send out a line trace, it shoots out two lines and damages the other player correctly. After I shoot about 10 bullets, the second line disappears and the enemy is no longer damaged / hit is no longer registered. I can go ahead and send the line trace code if you need

[fierce grove]

but it's fine on local

[thin stratus]

What ensures that this comes in before the Spawn request though?

Would need to have some sort of back and forth to confirm that the class is loaded.

[winged badger]

you have a general idea what you'll be spawning before you start

usually

so you can make them load stuff in advance

[quasi tide]

Just tryin' to bump this issue that I have. Any insight would be great.

[timber zealot]

I can't seem to get dynamically created box collision components to replicate properly. After creation I call "SetIsReplicated" for that component in the construction script.

• Only server spawns the initial actor holding the components
• Initial Actor is set to replicate

What is it that I'm not seeing?

[twin juniper]

I'm setting rotation of a character on the server but it is not reflected on the local client, although other clients do see the rotation@

[meager spade]

@thin stratus i was tinkering around with keeping all AI stuff as soft class ptrs, but on loading into a map, i know what enemies are going to spawn, so i load the data asset that defines them which loads the class already, this happens also on clients as they also know what should be loaded for that specific game mode, (cause the server tells them via a onrep and gameplay tags)

err not on rep, client rpc

[thin stratus]

Yeah i will see if we have to fallback to that

Based on all of this I would be able to repro this by making a new actor, not referencing it anywhere but once as softref class and then loading it on server and spawning it

That should cause the same error on the client

[hollow oasis]

can anyone here help me with servertravel?

[drowsy arch]

i got it working

[twilit flint]

How can I execute code in playercontroller in cpp after OnUnPossess pawn for client? Ofx this event is only severer side. Is there other event similarly to OnRep_PlayerState() executed on client side where I can attache my code (destroy hud) or I have add new client method and call it form sever from OnUnPossess?

[foggy idol]

what are you trying to do ?

[twilit flint]

Destory HUD after unpossess pawn

instance of UIWidgeht i have in PC

[foggy idol]

Hmmm

I think you'll just have to make a run on client function

[twilit flint]

ok

[kindred widget]

@twilit flint I don't personally feel that there are a lot of solid ways to handle that. I personally tend to do a lot of that stuff by checking the currently possessed pawn in AHUD on tick. If LocalController->GetControlledPawn IsValid, your controller has a pawn. If not, remove the parts of UI that you don't want to show when there isn't a pawn controlled.

[twilit flint]

@kindred widget thx

[twin juniper]

I have a static mesh component on my character but it's not visible for any client, the component is set to replicate

nevermind forgot to call Component->SetupAttachment

[twin juniper]

I'm using RInterpConstantTo on Tick() on the client and the server, I'm doing the exact same thing on 2 different characters, one character is only represented by this ball with a cone (static meshes), but it doesn't rotate as smoothly as the othe character that has a skeletal mesh https://imgur.com/a/VzZsc3l

https://imgur.com/a/gL0r63X the skeletal mesh rotates much more smoothly than the red ball/cone with the same logic

so I assume the static mesh component isn't replicating as fast? the movement also looks jittery

[kindred widget]

Are you sure that the character's mesh is being overridden? Enforcing server values will lead to looking jittery like that mesh. If you're doing a look at target system, I wouldn't bother with server overrides of rotation much. Just give the client a target and let them do their own interpolation.

[twin juniper]

The character mesh is still there it just doesn't have any function for this character sphere/cone character

Just give the client a target and let them do their own interpolation.
How would I do this? Currently I'm interpolating towards the location of the mouse by sending it to the server

[kindred widget]

Mostly just server RPC, to set the vector. Let it replicate, and let all machines interpolate on tick. And don't do any server authoritive rotation. Otherwise you'll end up with hitches where client rotates, server replicates nearly the same rotation, client rotates again, then server's replicated rotation reaches client and the client's rotation temporarily reverses, and then the client sets a new interp. Moving fast, it looks like hitching.

[twin juniper]

I think I've heard this before, but if the rotation is not set on the server, how will the server have the correct rotation?

[kindred widget]

The idea is that you give every machine the direction you want it to face, and then let them all turn to the direction on their own.

Or a point you want them to look at in this case.

Networking is slow. So you find ways to do as much locally as you can while networking as little as you can manage.

[twin juniper]

Alright, so just to be sure, I just set the vector with an RPC, it replicates to other clients, and those clients should interpolate rotation locally, let me give it a try

[twin juniper]

So that smoothed it a lot, but there's some issue when the sphere character begins to move https://imgur.com/a/tTQuJpF the rotation seems to not work when moving

the movement is done through AddMovementInput

[kindred widget]

Movement shouldn't affect rotation. How is rotation being done? And what class is this?

[twin juniper]

{
    FVector DirectionToRotateTo = VectorToInterpolateTo - GetActorLocation();

    UKismetSystemLibrary::DrawDebugLine(this, VectorToInterpolateTo, GetActorLocation(), FLinearColor::Red);

    FVector NormalizedDirectionToRotateTo = DirectionToRotateTo.GetSafeNormal();

    FRotator TargetRotation = UKismetMathLibrary::Conv_VectorToRotator(NormalizedDirectionToRotateTo);
    

    // Get turn rate
    float TurnRateAttribute = 0.5;

    // Get degrees between the target rotations
    FVector yy = NormalizedDirectionToRotateTo;
    FVector xx = UKismetMathLibrary::Conv_RotatorToVector(
        GetActorRotation()).GetSafeNormal();
    float Result = FVector::DotProduct(xx, yy);
    Result = Result / (xx.Size() * yy.Size());
    Result = FMath::Acos(Result);
    
    float TimeToPerformTurningDegreesTurn = (0.03f * Result) / TurnRateAttribute;

    FRotator NewActorRotation = FMath::RInterpConstantTo(
        GetActorRotation(), TargetRotation, DeltaTime,
        ((Result * 180.0f) / 3.1416f) / TimeToPerformTurningDegreesTurn );
    NewActorRotation.Pitch = 0.0f;
    NewActorRotation.Roll = 0.0f;
    
    SetActorRotation(NewActorRotation);
}

this is how the interpolation of the rotation is done, the sphere/cone character inherits from ACharacter

The pasted function is called on local Tick()

VectorTOInterpolateTO is the replicated vector sent to the server

[kindred widget]

CMC might be fighting the rotation while moving somehow. Instead of setting actor rotation, you might make the character use it's control rotation and set that on the controller instead.

[twin juniper]

hmm let me try, I didn't know player controllers were replicated to other clients too

[kindred widget]

Oh, that's fair. They won't be, you'd have to do that on server, so that's not really an option.

[twin juniper]

hmmm

[twin juniper]

Any idea of how would I go about fixing it?

If you have an example/resource I could take a look and see why mine's not working

[kindred widget]

Are you using OrientRotationToMovement settings by chance?

[twin juniper]

nope

not using controller rotation either

[kindred widget]

I wonder if you could use the UseControllerDesiredRotation setting, and set the rotation on the server for that instead of replicating the point. I'm semi certain that still rotates smoothly on clients.

[twin juniper]

let me give it a go

[twin juniper]

using SetControlRotation on server, but it isn't rotating

[winged badger]

is your debug drawing correctly? whats VectorToInterpolateTo?

and you're generally overcomplicating the function

[twin juniper]

VectorToInterpolateTo is the end of the red debug line and it's correct

[winged badger]

first 4 lines can be replaced with either with a single GetLookAtRotation or MakeRot call

why you're calculating dot and angle is also beyond me

[twin juniper]

it's an implementation of the Turn Rate feature of Dota 2, that's why I'm doing it like this

[winged badger]

SetActorRotation(FMath::RInterpConstantTo(GetActorRotation(), TargetRotation, DeltaTime, RotationSpeedPerSecond));

that replaces your bottom 2/3rds of the function, and works

as i said, overcomplicating there

const FRotator TargetRotation = UKismetMathLibrary::MakeRotFromZX(FVector::UpVector, VectorToInterpolateTo - GetActorLocation());

that will also nuke your pitch and roll to 0

which cuts the entire function to 2 lines of code

[twin juniper]

cries in dropout... but seriously it looks like it's not jittering anymore

with the changes you made

[polar urchin]

float ABaseCharacter::GetSpeed()
{
    return Speed = GetVelocity().Size();
}
``` So I have that function that returns speed which I'm using in a c++ animinstance to drive an animation the problem is that I can't wrap my head around how to properly replicate speed so that the animation plays on all clients connected to the dedicated server

[twin juniper]

this is still happens when the character moves https://imgur.com/a/zFbD463

[winged badger]

then your CMC is fighting it

probably with orient to movement

[twin juniper]

orient to movement is not set

[polar urchin]

On the client the animation plays perfectly

[winged badger]

one of automatic rotation handling options is

[charred crane]

I have a server side replicated actor setting its position based on a timeline. The timeline is set to replicate as well. The object's do not appear on the client. Anyone know why?

[winged badger]

don't replicate timeline

just replicate that it started moving along the spline and let the client timeline run its own thing

[shy kelp]

Since using root motion with multiplayer is a dumb idea with players, can u still use it with AI?

[twin juniper]

I'm not using controller rotation, nor orient rotation to movement, is there another variable I should look at?

[winged badger]

the GameplayTasks can handle MP root motion @shy kelp

[charred crane]

The object is spawned on the server and the movement is done on the server. Shouldn't the position just update to the client accordingly?

[winged badger]

client can simulate in deterministic manner

so no

its cheaper, smoother and just as accurate

[shy kelp]

No clue what that is, but I'll see

I use bp so yeah

[winged badger]

that might be a problem

[shy kelp]

Ok, so should I just use in place theb

[charred crane]

I'm not really concerned about the cost or anything. I'm trying to figure out why this isn't working.

[shy kelp]

I can do either, it's just root motion is significantly easier to use lmao

[winged badger]

@polar urchin your CMC should have speed synced at all times, otherwise you'd get horrendous jitter

so just pull the speed from CMC

@charred crane you can go and have a read at UTimelineComponent code

im not sure it was meant to replicate, it does have the option because its an ActorComponent

[charred crane]

Well i mean it doesn't have to replicate. I'm using SetActorLocation from the server. The timeline is running on the server. The server sees the actor's position update. The client does not. The object actually disappears when the timeline would begin on client.

I know the client is not calling the code that does the timeline, so it seems like somehow the resulting actor location is not being replicated to the client

[twin juniper]

if anyone has idea about this I'd appreciate the help

[charred crane]

Your character is jittering when you turn?

[kindred widget]

@charred crane Not sure why it's disappearing, but normally movement is only replicated one of two ways. Either a vector is replicated and an onrep or tick function used to move it, or you have ReplicatesMovement checked. Otherwise you should be able to move a replicated object anywhere and it shouldn't do anything different on other machines.

[charred crane]

Yeah I'm pulling my hair out about it. I know it's movement is replicating because I give it an initial velocity (which the client sees) before I let the timeline take over

[twin juniper]

I'm setting a vector on the server, replicating it to clients so they interpolate the rotation (with SetActorROtation) locally, it works when not moving, but it jitters and has the wrong rotation when moving

[meager spade]

@charred crane TimelineComponent can be replicated

as long as obvs actor and component is set to replicate

[charred crane]

Yeah, just not sure if that matters since server is doing all the work right?

[meager spade]

i mean you say the object does not appear on client

that would be the first thing to solve before the timeline

[charred crane]

It appears on the client until the timeline triggers on the server

[meager spade]

yeah but are the values set right?

i mean it could have just moved to some random spot

[charred crane]

The server sees it operating as expected

[meager spade]

i mean the client

print on tick

the location of the actor

and see if they both match

[charred crane]

Maybe something in this image will explain the problem.

Client does not see LogThis output, so it shouldn't be doing any of the resulting logic either, right? (LogThis is just a more elaborate print string)

I think it's possible that the object is somehow having it's position moved like you said, but I don't understand how that could occur

[meager spade]

and how does client know the locations?

[charred crane]

I have replicatesMovement enabled

[meager spade]

i mean the variables

how are they set

[charred crane]

Oh, currentlocation is set before the log to the actors current location and target location is passed in when the object is spawned

[meager spade]

but that is not replicated

mark those properties replicated

and try again

[vivid seal]

Saw GameplayTasts mentioned above, are those related to AbilityTasks, or just another name for them?

I've been looking at trying to do something similar to AbilityTasks but without using GAS

[charred crane]

It works now. Thanks! Guess I don't understand replication as well as I thought I did.

The objects are really jittery wile they're moving now. Could that be due to the timeline not replicating or something?

[meager spade]

turn off replicate movement

in your actor replication

[twin juniper]

still need helps with this : D

[crystal crag]

@twin juniper Unfortunately it is very common for people to pretend that they don't see your question here Wuhie. It's like they randomly pick all at once to ignore someone and then they commit to it.

[eternal canyon]

It's usually because there is either already a conversation going on or the question doesn't give enough information

they're not trying to be rude

or anything

😅

[crystal crag]

Which is fair, but regardless of the reason, I know I've gone on a several month streak of asking questions, with no one ever responding to it what so ever. The last question I asked did get answered and was helpful, but that was after probably three or four months of asking a question here and there, to hear crickets chirping.

[vivid seal]

i've found the more specific your question, the less likely anyone wants to put in the effort to understand your code base. if you post a small snippet of code with an obvious error people will help you out, but if you ask questions about architecture of a system or really niche behavior in part of the engine people don't tend to use, you rarely get someone who wants to take the time to figure out what you're talking about. can't blame people for that really

[meager spade]

The biggest issue is when people say "Help my code is not working" and not actually show any code but give you a small bit of text and assume you can see there code and know the issue. Second is when people have specific problems with there code, which is specific to there game, yet are unwilling to provide any information or show code. If you ask a question and no one replies, maybe re-format your question and provide additional information. More likely to get someone who will help if they can understand your issue better.

[eternal canyon]

^^

[meager spade]

or maybe no one who saw your question can answer it, because its not their area of expertise, or they are too busy 😛

also @twin juniper i recommend doing that rotation inside CMC PhysicsRotation function

[lost inlet]

uh sorry to be that guy, but *their

[meager spade]

its 4am, my grammar/spelling brain is turned off 😄

[lost inlet]

didn't see any code with that issue either

[meager spade]

#multiplayer message

tho if that is not a CMC character, then its likely that you have replicate movement but are not smoothing the simulated proxies

and if you have replicated movement on, server is likely also correcting the client

hence the fighting

as ReplicateMovement will send the servers position which is different to the clients, and you will see that stutter

oh that is rotation only, damn i need some sleep 😦

[charred crane]

When I did this, the object disappeared again. Maybe it's jittering because the timeline is no longer replicating?

[charred crane]

That was it! Needed those 2 vars to replicate + replicates movement + timeline replicating. Thank you UKaosSpectrum! Why does the value that is being used server side (the locations) need to be replicated to the client when the server is moving the object? I thought that this issue would only arise if the client would try to move the object with non-replicated values.

[twin juniper]

I'll give it a try

I guess I'll have to read what it does

{
    if (!(bOrientRotationToMovement || bUseControllerDesiredRotation))
    {
        return;
    }

My character doesn't OrientRotationToMovement nor UseControllerDesiredRotation so I guess I can't use this function?

[vivid seal]

is it possible to use RootMotion Ability Tasks (from GAS) without using GAS? I have my own ability system and while its like 90% functional, I have no idea how to tackle predicting movement specifically. prediction of everything else is handled by my ability component, but I don't really know how to deal with the CMC

[thin stratus]

So I'm still not convinced that this is needed. I made 2 new Actors. One that just a Box Mesh in it for visuals and is replicated. And one that Spawns the BoxMesh one.
I only Soft Ref the Class in the Spawner, nothing else and nowhere else is that Actor referenced.
I load the class on the Server before spawning.

Result: Client spawns the Actor just fine.

In standalone that is, so same where the original bug appears.

[meager spade]

hmm, when i tested using SoftClassPtr and only loaded it on server, it failed on the client cause the asset was not loaded

[thin stratus]

I expected that too with the information I have. But I can't repro it like this

[meager spade]

unless they changed something in the networking code to load soft references, but that would make it blocking and i don't think epic would let something like that happen?

[thin stratus]

[2021.04.16-07.19.09:852][887]LogUObjectGlobals: BeginLoad(/Game/WIP/Cedric/Blueprints/BP_TestActor) is flushing async loading

This printed on the Client

When I spawned the Actor from Server-side

So yeah, I'm not sure why the other scenario fails to spawn the actor.
Guess I have to further investigate the bug itself.

[meager spade]

so it does sync load it

interesting

tho i would prefer not to block the game thread during things like that 😄

[thin stratus]

Yeah of course, but that's sadly not the problem

It seems to be perfectly able to find the softreferenced class when getting the replicated task to spawn the actor. So something is really odd with that other actor/ai in our game.

[meager spade]

yeah

[wind lance]

Can somebody tell me what is the difference between DOREPLIFETIME_WITH_PARAMS and DOREPLIFETIME_WITH_PARAMS_FAST and when should I use what?

[rose egret]

I used to test with my colleague by launching editor as client . everything was OK weeks ago but currently the second PC get disconnected 2 seconds after joining game server.
and server prints the following error:

[2021.04.16-07.45.13:766][496]LogNetTraffic: Error: UChannel::ReceivedRawBunch: Bunch.IsError() after ReceivedNextBunch 1
[2021.04.16-07.45.13:767][496]LogNetTraffic: Error: Received corrupted packet data from client 192.168.1.239.  Disconnecting.

UE4 version and project are exactly the same BTW.

🤔

[empty axle]

I think there is some setting to change it to async load, but we had some troubles with that IIRC

I believe it was net.AllowAsyncLoading

which is by default set to 0 probably for some reason 😄

[thin stratus]

I looked into it a bit more and wanted to share some info cause you helped me in the past and maybe that interests you or helps you in the future.

I haven't figuted out my issue yet but I followed the code around.

The client does indeed get a path from the server for the object, registers that, without loading the object, to a NetGUID, Object lookup map.

Then it tries to get the object from the map which will indeed load it. There is even support for async loading. Taking a break atm but can give you some filenames and lines later.

[thin stratus]

That is correct. Sorry didn't read that message before typing away. That var constrols it and seems to be 0/false by default

[chrome bay]

Does it load it sync if that's false?

[thin stratus]

Yes

There are more variables to control this

[chrome bay]

Does it do that via a streaming manager or does it just call SoftObject.LoadSyncronous()?

[thin stratus]

There is also one for halting rpcs if they rely on those packages

[chrome bay]

I recently learned the latter was not good 😦

[thin stratus]

I will double check once I'm back at my pc

PackageMapClient.cpp is the file that handles most if not all of this stuff

[winged badger]

all of it, iirc

[thin stratus]

I think. I should really wait till I'm back at my pc

I think the issue with our enemy not working on the client comes from the server already sending bad info

But yeah will need a lot more staring at source code to figure that one out

[winged badger]

@thin stratus does this happen only in standalone?

[thin stratus]

Standlaone and builds

And seems fixed if I hardref the specific class but also happens for other classes. Hardreffing the class should not be needed though

[winged badger]

hardref was a good step to check if you're on the right track

but its not a solve, agreed

[polar urchin]

So if i load into the engine and use the default untitled map the ue4 generates for you. Set up my player starts and use gamemode override to set the gamemode all replication and animations are playing on all clients as it should. However if i make a new level and set everything up the same way only movement replicates and i have no idea why

This doesnt happen if i move things to a new project

What i figured it out

for some reason the blockouttools plugin causes it

?

[thin stratus]

No idea what plugin that is

Is that a native one?

[polar urchin]

no

[thin stratus]

Then you gotta ask the creator

[polar urchin]

I'm gonna shoot them an email

cause it works just fine If i use bsp geometry

[thin stratus]

if ( bIsPackage )
{
    // Async load the package if:
    //    1. We are actually a package
    //    2. We aren't already pending
    //    3. We're actually suppose to load (levels don't load here for example)
    //        (Refer to CanClientLoadObject, which is where we protect clients from trying to load levels)

    if ( ShouldAsyncLoad() )
    {
        if (!PendingAsyncLoadRequests.Contains(CacheObjectPtr->PathName))
        {
            StartAsyncLoadingPackage(*CacheObjectPtr, NetGUID, false);
            UE_LOG(LogNetPackageMap, Log, TEXT("GetObjectFromNetGUID: Async loading package. Path: %s, NetGUID: %s"), *CacheObjectPtr->PathName.ToString(), *NetGUID.ToString());
        }
        else
        {
            ValidateAsyncLoadingPackage(*CacheObjectPtr, NetGUID);
        }

        // There is nothing else to do except wait on the delegate to tell us this package is done loading
        return NULL;
    }
    else
    {
        // Async loading disabled
        Object = LoadPackage( NULL, *CacheObjectPtr->PathName.ToString(), LOAD_None );
    }
}          

[thin stratus]

Seems to just use LoadPackageInternal in UObjectGlobals

[chrome bay]

Ooo. I wonder if that flushes async too

[thin stratus]

It does

[chrome bay]

sadness noises

[thin stratus]

void BeginLoad(FUObjectSerializeContext* LoadContext, const TCHAR* DebugContext)
{
    check(LoadContext);
    if (!LoadContext->HasStartedLoading() && !IsInAsyncLoadingThread())
    {
        if (IsAsyncLoading() && (DebugContext != nullptr))
        {
            UE_LOG(LogUObjectGlobals, Log, TEXT("BeginLoad(%s) is flushing async loading"), DebugContext);
        }

        // Make sure we're finishing up all pending async loads, and trigger texture streaming next tick if necessary.
        FlushAsyncLoading();
    }
    if (IsInGameThread() && !IsInAsyncLoadingThread())
    {
        GGameThreadLoadCounter++;
    }

    LoadContext->IncrementBeginLoadCount();
}

[winged badger]

@thin stratus its a bit of a long shot

do you have redirectors for the problematic classes?

longshot because i am unsure how it would break in a packaged build. but it would break standalone

[thin stratus]

Will check

[drowsy belfry]

Hello, I’m having some trouble with actor spawning on a multiplayer game.

I have actors that are set to replicate and when spawned on the server side they take a lot of time to appear on clients. At first I thought it had to be something related to the netupdatefrequency or the netpriority which I had previously reduced on the spawned actors so I added a ForceNetUpdate after the spawn, something like:

AActor* pSpawnedActor = GetWorld()->SpawnActor<AActor>(ActorType, Position, Rotation, spawnParams);
pSpawnedActor->ForceNetUpdate(); 

But it still doesn’t work, the network is not saturated and the ping is ~50ms but it takes from half a second to several seconds to spawn the actors on the clients. The actors spawned aren't too big either and they are instantly spawned on the server so it’s not that it takes too much to spawn them, it has to be that the RPC is arriving late for some reason but I’m unable to find why.

[fierce grove]

Hello guys, Do you know why Clients receive an "error Bad unique net id" , it's fine on the server any clues?

Im casting this from the game mode

[unkempt wing]

Quick question about RPC's: I'm using turn-based mechanics in part of my multiplayer game. Players take turns taking an action and I use an RPC that executes on the server for it. The _Validate function checks if it's the player's turn (the input on the PlayerController won't send the RPC call if the client doesn't see it's their turn). Do I need to worry about client latency messing up this flow and the players getting kicked out for waiting until the end of their turns for this action?

[marble gazelle]

you can also test that, unreal allows to simulate latency and package loss issues

[unkempt wing]

Oh, that's perfect! Thanks for the tip

[marble gazelle]

for the question it self, I suggest doing some sort of flow chart to visualize the calls, that can help to identify such issues

[indigo path]

Hey everybody, which is the best way to go to have client-side prediction in a click to move setting? Is it possible without using any proxy pawn?

[twin juniper]

I'm in need of a bit of assistance, I'm sending VectorToInterpolateTo (which is the location of the cursor) to the server and replicating VectorToInterpolateTo to other clients, and calling InterpolateToCursorLocation on clients in order to interpolate a character's rotation locally. Because if I interpolate it on the server, it's jittery. It works when the character is idle, but when the character is moving this happens

{
    UKismetSystemLibrary::DrawDebugLine(this, VectorToInterpolateTo, GetActorLocation(), FLinearColor::Red);

    FRotator TargetRotation = UKismetMathLibrary::MakeRotFromZX(FVector::UpVector, VectorToInterpolateTo - GetActorLocation());

    SetActorRotation(FMath::RInterpConstantTo(GetActorRotation(), TargetRotation, DeltaTime, 1000.0f));
}

https://imgur.com/a/Zczdnfr

[final rover]

Has anyone made anything with the network prediction plugin? Would be nice to see what people have made and hopefully learn from their code

[chrome bay]

started toying with it but waiting until they wrap it up first

most interested in the physics integration but Chaos still isn't really production ready IMO

[fierce grove]

No one on this ? Not possible to send a net id from GM to clients ?

[unkempt wing]

The RPCs are reliable, I'm more worried about them getting to the server too late due to latency and the Validation function kicking players out for no reason.
Do reliable RPCs happen faster or in higher priority? I'm not overly familiar with them.

[kindred widget]

@fierce grove GameMode does not exist on clients. So no, you cannot send a multicast from it. GameMode is not actually replicated.

You also definitely should not be running a client event after a multicast. Multicast is sent from server to all machines. So you're already on the clients in most all cases. Therefore client RPC is unnecessary.

[fierce grove]

The controllers receive the event. I’m just trying to find the best way to make my lobby HUD receiving event from who’s is connecting / leaving . I managed it but I know it’s hackish as hell !

[kindred widget]

Well, they receive it because the game mode's multicast is still run on the server. So that may as well be a non RPC event that in turn calls the client events on the controllers. Better handling might be some bindings in GameState to handle calling functions when people join/leave to update UI. People joining is automatically replicated in GameState through the Players array of PlayerStates. Not sure how much easy access BP has to those overrides though.

Then there's no extra networking involved either.

[fierce grove]

I have to make a call to the game state and maybe do an event dispatcher for joining and leaving session

[unkempt wing]

That makes sense. Thanks for all the help!

[kindred widget]

If you're using C++, just override these and make a binding that the override calls, and let your UI bind to it to update themselves.

[fierce grove]

Um I see

[kindred widget]

If you're using blueprint. Cache the PlayerArray in AHUD, and make a similar binding, and check if cached array is identical on tick. Call binding if changed and then update.

Not the prettiest method, but it'll work. 🤷‍♂️

[fierce grove]

I do it even based by the player controller catching the player array from the game state and adding only the ids not in the serialized net ids I fill ...

[dark edge]

No I haven't messed with it but I'm interested especially if it's kind of a generic property prediction type of thing and not just tied to movement

[dark edge]

You shouldn't be doing it like that. Who is in what party is state, that should live on the game state. Or each player State can contain what party they are in, equivalently

So the game State can have a list of parties and who's in them, or each person can have what party they're in

[lime wren]

Hello its possible to "compile" a dedicated server without sources ?

[quick musk]

You need Source Code in order to enable builds for dedicated servers

[lime wren]

Yeah ok because is very long to do this, for .. every builds

[merry pebble]

Anyone know why my client is still snapping back and forth when trying to fly? Any ideas on how to fix this code?

[eternal canyon]

there are many many things wrong with this

and i recommend you watch a tutorial on the basics of multiplayer😅

as that would definetely help you out

and btw inputs are local only

so that switch has authority is useless

and also input axis' are running on tick technically

so ur server function shouldnt be reliable

[merry pebble]

Ah, i just threw this together to see. But ight, I appreciate the swift response 😄

[eternal canyon]

and also real movement in multiplayer with lag compensation can only really be done in c++

[merry pebble]

Yeah I know its gonna lag but it looks like the client and server have two different ideas on if the player should be moving or not

[eternal canyon]

Well I mean I would; reccomond inheriting from UCharacterMovement in C++ and setting it to a custom movement mode that sets velocity up

so then it would be predicted

and woudlnt snap u back

[quick musk]

hm no clue what you're doing(not trying to be mean, i swear!) but this is my simple thing i have that enables me to move up and down for my flying component and no lag

[merry pebble]

Yeah I have that currently

I tried it on server

then multi

then both

I have been trying to figure it out on my own before I asked lol

[lime wren]

Basically, "Characters" are automatically replicated (movement, rotations ...) so you dont need to pay attention for this

[quick musk]

well you're trying to replicate it for w/e reason when movement capabilities are automatically replicated

^^ that

[eternal canyon]

Not exactly

[quick musk]

well mostly

[lime wren]

yeah i mean

you dont need to tell the server to move

[eternal canyon]

There locations and rotations and scale are but adding to that isnt done automatically

[lime wren]

you just keyboard -> add movement input

[eternal canyon]

and a few basic movement mdoes

[lime wren]

yeah

but the basics

[eternal canyon]

but for most cases its better to just inherit from UCharacterMovment and do the logic there

instead of doing these hacky solutions

😅

[merry pebble]

Didn't know

Good to know now ig

Ur talking about going into the C++ of the Ucharactermovement?

[eternal canyon]

Whatever works I guess tho for u🤷‍♂️

[eternal canyon]

yup

[quick musk]

i mean u wouldnt need to do c++ to do that flying component

[merry pebble]

Im just trying to understand and try to do it as best as possible lol

[quick musk]

like i said what i have seemingly works fine with no lag in my testing

[merry pebble]

You talking about this?

[quick musk]

yeah

[eternal canyon]

c++ isnt too hard

🙃

depending on what ur doing

[merry pebble]

I would like to get into C++ with UE4 lol

If I was to go into the C++, what would I do then?

[merry pebble]

now im getting infinite loop with jumping

[lime wren]

show

[quick musk]

hmm no clue where to ask for this, but does anyone else have issues when trying using LineTraceByChannel and being above another player's pawn/character

[dark edge]

What would the issue be?

[quick musk]

im honestly still trying to deduce the issue, but what's been happening if the player im controlling is above another character, they just can't do damage to them (the other character)

[dark edge]

start with using debug on your line trace to see if it's even hitting

also print string or use a breakpoint on the event hit to see if its firing

[quick musk]

everything is seemingly firing properly and using breakpoints they all stopped the debugging as they all fired off

[modern swift]

what is the good choice of network solution for UE4 , the net engine should include function for matchmaking, ,login, packet encryption compression, easy to extend , I only know KBEngine , Agones, EOS, Photon. Any suggestion for a solid solution for multiplayer game with security control?

[final rover]

What exactly did you try out when testing it? Did you get anything working? I'd like to switch my character to use network prediction for movement instead of relying on cmc for network synchronization. I'm a little new to multiplayer stuff though, so I'm feeling a little lost on where to start

[bitter oriole]

The default engine + Steam ?

[modern swift]

but I am not sure the default engine can encrypt the packet and I want it work in mobile, not only steam

[bitter oriole]

Pretty sure the Steam socket driver encrypts data, but if you need mobile, then you probably need something else

[modern swift]

maybe on pc console steam is the most easy choice

anyone know what fornite use for network solution, is it custom solution that didnt disclose to public?

[bitter oriole]

Steam isn't available on console

And Fortnite uses what's in the engine, of course

Plus the Fortnite version of EOS for authentication & matchmaking

Since EOS is derived from the Fortnite services

[modern swift]

EOS currently seems only support P2P encryption? I am not sure if it support if I want host a dedicated server for each room for matchmaking

[bitter oriole]

I'm not sure what you're asking. Dedicated servers are unrelated to matchmaking and UE4 doesn't do P2P so Fortnite doesn't either

As to encryption I'm not sure Fortnite does it or why it would

[modern swift]

I think fornite must have a encryption solution to avoid people simply download a hack tool to hack the server

[bitter oriole]

That's not how this works

Plus any encryption between client and server is always "hackable" by client or server

Encryption simply prevents tampering by a third party on the way

[modern swift]

yes, if they want to hack it will ultimately hack in the server, I just wondering fornite have a server architecture like gateway/frontend to distribute the packet to other server like game server and login server

[bitter oriole]

The usual architecture for a game like Fortnite (competitive, dedicated based, with persistent progression) is

• dedicated game servers that only handle playing the game
• database servers that handle storing the player's progress
• the online service that does authentication/matchmaking (Steam/EOS/PlayStation/whatever)
  Players can access the DB server with an HTTPS socket, so can the game servers, only game servers can change progression

Your DB server can be 300 lines of Python with a basic HTTP server that reads json commands

Your online service can be whatever

[modern swift]

if I use EOS to do matchmaking , when all the player join room, can ask EOS to open a unreal instance on dedicate server to let player to join, is this approach workable?

[bitter oriole]

Most games will have a pool of dedicated servers that are always up and monitor the player population to start or stop servers

It's not like your game will need 200 servers

[modern swift]

that mean if I create a pool of dedicated server and ask EOS to choose one server is not unused to let player to join , does that work?

[bitter oriole]

Or you can simply let dedis create the sessions when they boot, have players search and join the session and join the server when enough players are there

Many ways to do this really

EOS does matchmaking, it doesn't manage your servers

[modern swift]

but for the default engine, does the packet have encryption by default or I need to enable it ?

[bitter oriole]

As far as I know, the default engine doesn't slow down networking by encrypting multiplayer traffic

There's no point doing that really

[modern swift]

Thanks understand now

[unkempt wing]

Does anybody know a way to make clients connect and spawn with the PlayerStart's rotation into account too? When I test the level in standalone it works but PIE as a client connecting to dedicated server (the setup I'll be using in release) the players spawn with 0, 0, 0 rotation.

[kindred widget]

@unkempt wing Consider trying to set the controller's control rotation to the same rotation as the playerstart's world rotation. Once the pawn is possessed, most rotations will be overridden by their controller's ControlRotation.

[unkempt wing]

Would I do that in the GameMode then? I'm not familiar enough with movement over multiplayer but my guess is that I'd set the control rotation on the network authority

I just tried it in OnPostLogin and it didn't work

[meager spade]

post login is too early tho

you need to do it when the controller possesses the pawn

[kindred widget]

I meant someplace more like where you're spawning the pawn for the controller. I'm uncertain how that works with networking directly though because I know ControlRotation isn't directly replicated.

[unkempt wing]

I can try OnPossess on the PC

[meager spade]

control rotation sets the pawn rotation (which is replicated if using a CMC) and Control Rotation is enabled on the pawns CMC. I did nothing special to get the rotation to work, except make my cmc use Control Rotation, disable Orient to Movement and disable Control Rotation Yaw in the pawn

they spawn at player start rotated properly

[unkempt wing]

Oh hmm. I'm using the DefaultPawn class for this part since this is where the players select their character classes. I'll try making a random pawn class with those settings

Also APlayerController::OnPossess didn't work

[kindred widget]

SpawnDefaultPawnFor, is where I normally handle that sort of stuff. In GameMode.

You have access to create the pawn you want, at the location you want, and access to the controller to set control rotation.

Either that, or you could likely handle it where ever you're calling possess on the Pawn.

[unkempt wing]

This is just the default entry when players connect to the server. I'll try SpawnDefaultPawnFor though that sounds promising

It's how I use the character class selections anyways

[muted glacier]

Hey guys.
I was wondering what the best way would be to create custom server settings like damage and hp multipliers, so that its possible to read and write to like a file on a server through blueprinting?

[dark edge]

@muted glacier how you implement it will depend on your damage and ability architecture, but in general it would be a save game file written to and loaded by the game mode

It could then Grant a buff to everybody if you use buffs, or in some other way set damage multiplier and health multiplier on everything

[kindred widget]

Also depends on the implementation. Game like ARK for instance, just use INI settings, which are likely loaded into variables that runtime code can check when something is damaged. But that doesn't work so well if you're not doing a server admin style setup.

[dark edge]

Quick question, does starting a session turn a standalone instance into a listen instance or do you need to explicitly open a map as listen and then start the session?

Basically the desired effect is that you can be playing single player, invite a friend, and seamlessly have them join. No loading of any map.

No loading from the host perspective. Of course the client will have to load when it joins

[lime wren]

build from source is obligatory to get a dedicated server ? 😢

[bitter oriole]

Yes

[charred crane]

I have an actor that I spawn and add impulse to. On the server it works fine, but on the client, the objects don't even appear. When I disable simulate physics the objects appear for the client. So physics simulation is probably launching them somewhere weird, right? For some reason the objects are spawning at the origin for clients.

[kindred widget]

If you are simulating physics on the root component, it may be a relevancy issue. Unsure though.

[sullen kernel]

Any idea why in an ActorComponent's BeginPlay, the player controller will be null on server side? I'm able to get the player pawn by using the templated version of GetOwner<AMyCharacter>(), but when I call the templated version of MyCharacter->GetController<AMyPlayerController>() I am getting null on the server.

I need my ActorComponent to bind to a delegate on my PlayerController and trying to find the best place to do that.

[winged badger]

because both Character and PC BeginPlay gets called before Possess

with default flow

[crystal crag]

I'm studying someone's "framework" and something has thrown me off

Wouldn't you want to call the play montage on the server?

Why would you call play montage first on the client, and then after a certain event, try to play the montage on the server?

aren't montages networked by default anyway? If I play a montage on the server, doesn't that replicate and play that montage for all clients as well?

[kindred widget]

I'm semi certain that montages are not replicated by default. They're animations, and animations are meant to be handled client side. So if the server wants all clients to play a montage, it needs to multicast that, or set a repnotify variable and do it in the notify function.

[crystal crag]

Hm... ok. I just never remember doing that. I know that animations by themselves are not replicated, but I thought playing a montage was replicated. I haven't had to look at animations for a bit though.

[meager spade]

also you likely don't want to use multicast

we use a replicated struct that keeps track of the current play time of the montage, so late joiners see the animation in actor

action*

rather than see nothing cause they missed the multicast

[winged badger]

its not just late joiners, its also players that walked into relevant range

[meager spade]

i still class them as late joiners 😄

but yeah that also

[merry pebble]

Anyone any good with replication? I looking at replicating this for clients and well I've been trying with no luck... What information will I need to let the server know of, and what do I need to multicast?

[meager spade]

first of all you can combine that to be a lot cleaner

second what actor is this called on?

secondly none of those events are replicated

[merry pebble]

This is on the parent character, and yes nothing is replicated. I undid everything I attempted to just start fresh

[meager spade]

well multicast can only be done on the server

[merry pebble]

oh ight

[meager spade]

and you can make that a lot cleaner

[merry pebble]

maybe run on server the first event and then multicast everything else

[crystal crag]

@meager spade Yeah I remember you mentioning that. Ok, so I must just be seeing my montages play with no issue as a side effect of how I am using the gameplay ability system.

But still, wouldn't you first play the montage on the server, and then have the server play the montage as a multicast? Without worrying about late joiners that is

I wouldn't think that you would first play the montage on the client, and then have the server multicast it

[meager spade]

@merry pebble http://www.thegames.dev/snaps/UE4Editor-Win64-DebugGame_LGIFaYeBsy.png

[fallow shadow]

Hey, does anyone know how to do a sphere trace for objects in multiplayer BP?

[meager spade]

multiplayer has nothing to do with sphere traces

maybe explain what you are trying to do

[fallow shadow]

oh okay, i am just trying to do a sphere trace. It works on single player but not on multiplayer(i am trying to trace how many enemies were hit by a blade)

[meager spade]

well it being multiplayer will not affect your traces

traces are all done locally

show your nodes?

[fallow shadow]

well, i can tell you it's not working lol

[meager spade]

or code?

[fallow shadow]

yea sending pics

also that code is inside an actor component but i tried moving it into the character BP, didn't seem to have any effect though

[tranquil yoke]

How would i add a component to a Pawn, which has dependencies to a plugin and plugin is not being packaged for server. each time that pawn gets spawned , it throws an error regarding that.

[sullen kernel]

I see, any suggestions on how to bind my ActorComponent to a delegate in the PC? If the PC is not available on the server in the ActorComponent's BeginPlay?

[tranquil yoke]

@sullen kernel wait for it to get valid ?

[sullen kernel]

Yes, that's what I'm wondering. Where would it be valid and allow me to bind it

I usually used BeginPlay() with GetOwner() to bind to player delegates, but it seems that might not work here now that the delegate is on the PC

[tranquil yoke]

ideally, i dont do everything on Begin play, I create a sequence, Where there is master Manager, then Sub Manager then Individual classes.

So master Calls Initialise function of sub then sub calls it for individual classes.

[quasi tide]

So - trying to setup my HUD (not class - UMG Widgets). In the On Possess event, I am cast to my character and then running a Run on owning Client event. This works, however, I do plan on allowing my controller to possess another pawn. So I created an interface, check if the possessed pawn implements that interface, and if so, call an event on the PC that is Run on owning Client. This event will call the interface method.

The first approach works as expected, the second does not and I do not understand why. I thought that the PC would be owned by the client, so then it could run the interface function on the pawn that the client owns as well. Is it just a matter of the pawn not being owned by the client just yet?

[charred crane]

I hope someone can help me solve this. I am spawning a number of objects. If I use the code the way it appears in the picture, the objects spawn at the actors location on clients. When I use the red line to input the rotation, the objects spawn at the origin on clients. "Do the thing" loops through the transforms and spawns the objects.

[lime wren]

and whats the problem ?

[charred crane]

Plugging in that logic for rotation causes the objects location to become the origin instead of the passed in actors location.

[lime wren]

Vector to rotator ?

[charred crane]

The question is very clear. Why does setting my objects rotation modify its location from somewhere in the world, to the origin?

[lime wren]

maybe the pivot point ?

[charred crane]

I'm batch spawning objects with different rotation values passed in. It would be highly unlikely for one object to somehow have a pivot point to magically get it EXACTLY at the origin of 0.00000, 0.00000, 0.0000, but for 12 objects? That's basically impossible.

[lime wren]

and this

[charred crane]

What about it? It's just taking 3 floats and making a rotation out of it.

[lime wren]

multiply a vector with a rotator ?

not multiply

but

[charred crane]

it's not multiplying, its "make"ing it's just converting it

[lime wren]

your passing a vector to a rotator

its not like this

you need to make things like

"Make rot from X Vector"

[charred crane]

Hell, I'll give it a shot

That had no effect on my objects locations.

[timid moss]

When using push model, I've noticed the starting value of my replicated pushmodel property is replicated. Does push model automatically replicate at the start of the game even though I haven't marked it dirty yet?

[barren patrol]

am I reading the documentation correctly, that a client can only send an RPC to the server through an actor they own? Like their controller?

My use case is that I have a map manager object that needs to coordinate things between client and server, but it's a neutral actor within the level. It seems that a client RPC attempted on this actor would be dropped?

[sullen kernel]

Yes, I believe your understanding is correct @barren patrol . So the example given in the UE4 Network Compendium is opening a door which has been placed in the scene (and owned by the server). In that case, you would create a Server RPC on the PlayerController and let that call Open() on the door.

[barren patrol]

Thanks for confirming 🙂

It seems like the PlayerController class is going to get really bloated in that case

[sullen kernel]

If you don't have the UE4 Network Compendium pdf, I would recommend getting it. But it sounds like you are already understanding how it works.

[barren patrol]

I've read it before 🙂 but forgetting the details sometimes...

Still putting some concepts to practice for the first time (coming from Unity)

[sullen kernel]

My PlayerController class is a bit bloated as well. But unless my understanding is wrong, it seems like a necessary evil sometimes.

[barren patrol]

I'm using the Gameplay Ability System, which takes care of a lot of these concerns through that abstraction.

For example I have an Interact ability and objects just need to implement the Interactable interface to execute a "door open" logic on the server side.

But right now I'm working on some level streaming stuff, which is outside the scope of the ability system. So I'm going down the path of making a new actor component for the PC that can do these RPCs, I guess.

[sullen kernel]

It's been a little while since I've worked with that system. But I recall that on the ability you have the option to choose where it executes (server only, server initiated, etc). But yeah, in general I believe your understanding is correct.

[barren patrol]

Yeah, it takes care of initiating the ability across both sides. Then a simple HasAuthority check and you can do stuff just on the server, but initiated on the client. its actually a really nice system for the most part.

[merry harness]

Hiho i have a little problem with my Minimap. On my Minimap. In the right top Corner is my Client01, actually the Minimap Arrow is working fine. Yesterday the Arrows was moving around by Client01 but the arrow was trun around if other clients was running.

After starting the Engine now that problem isnt ...

So my next problem ist only Client01 have the Minimap Arrow and the other "players" dont have his own Arrow...

Is there a way to give every client a Player ID to change that?

Is a different Player ID fixing my problem?

The Get Ad ID Count is only an example. If im Moving Client05 the arrow is follow him but no rotation. The Rotation is only working if im moving Client01 xD

[lime wren]

Widgets are only on client, no server

= no server rpc etc on widget

on your minimap just make a thing like "get all players" and display it

[merry harness]

Ok but that will see all players also player how i shouldnt see like pcp enemys or NotInTeam Player. So all my Widgets (Healthbar, Minimap, Inventory) are not working? Should i use a HUD to fix that problem? Or how can i fix it for servers?

[lime wren]

To show things like healthbar you need to bind values in the widget, the server doesnt know widgets

You can filter players, just make a thing like « get all actor of class » and display it if the team is blue for example

Also, try to read a little of this : https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

It explain replications, access etc

[merry harness]

Ah ok thanks.

My game should be a multiplayer game so i have not to see all Players but ever Player should see and habe his pwn arrow. To see other Players is only important of im in a Gruppe with other Players. A Server doesnt know widgets, So i have to usw a HUD and Not a Mainwidget, Don't i?
I will read this PDF. Trank you.

Sorry Auto Correct to german 😋

[lime wren]

How your healthbar actually works?

[merry harness]

my healthbar and my Mini have a widget and this widget is linked to that main Widget, so i think i have to change the main widget to a HUD

[lime wren]

but widget = hud..?

And to display the player health tho

Like how are you handling this

[merry harness]

widget = hud?

I know this as widget

and this as HUD

Ok, just a quick explanation:

The server does not know any widgets but the client does know widgets.

You have two different levels.

The server only gives out Player ID 12, Life 1000, Mana 500, Level 3, worldposition X: Y: Z

The client will get this information and will set variables Health = 1000 Mana = 500 and so on Spawn X: Y: Z

[lime wren]

Ok just quick explanation about this

For example

You have the health value

In the PLAYER

, replicated

And the widget (healthbar) get their player health variablz

As simple

[lime wren]

Wtf never used this

[merry harness]

ok ^^

[lime wren]

Just dont use it its useless

Use widgets

[merry harness]

but server dont know widgets xD

[lime wren]

Dont do complex things, just « understand » and its really simple

Yeah

Wait i will show you an example

[merry harness]

ok multiplayer is complete new world for me ^^

[lime wren]

it was the same for me 1 year ago

but finally its really easy

just need to understand the bases

[merry harness]

ok

[lime wren]

so for example

here is my player blueprint

i made a "health variable" which is REPLICATED

so everbody knows about it

(basically)

here is the player hud

[merry harness]

i did this too

[lime wren]

you did this ?

[merry harness]

yes my health, mana and so on is replicated but i dont use bindings ^^

[lime wren]

use bindings

what are you using if you dont use bindings ?

[merry harness]

everyone was saying dont use bindungs 😦

[lime wren]

but bindings is logic

like its local

it can get players variable

so i dont know why people says to dont use it

[merry harness]

i have a big Event graph and functions

macros

[lime wren]

how do you pass the health to the widget ?

[merry harness]

in the main widget?

[lime wren]

yeah

to show the health bar

[merry harness]

i have bind the health widget into the main widget

[lime wren]

show me the code ?

your installation seems weird

[merry harness]

in the main widget is no code

[lime wren]

but to bind

you need a code

how the health (of the player) is displayed so

[merry harness]

ok i have a health widget there is the code and to combine at one screen Health, Minimap, Inventory, menues and so on i have created a main widget

the main widget is only handling where is witch widget displayed

[lime wren]

so

The Health widget is handled by the main widget ?

[merry harness]

this is my Character health, Mana and EXP widget with all the code

and this put into the main widget to config the position of the widgets

This means that I only need to create the Create Main Widget in cer cHaracter_BP and not each widget individually.
Create Heath_wigdet, Create, inventory, Create Minimap and so on

[lime wren]

this is a good idea

but you dont reply my question 😂 how your health widget get the player's health

[merry harness]

^^

[lime wren]

like screen ur code

[merry harness]

He will get the health Max and Current health form the server

So the Health i working until i have a server with a Character_Stats_Database

actually i only heave the Unreal Engine as dedicated server

This is a function in the character_BP

[lime wren]

yeah its overkilling

just bind like me

[merry harness]

In the blueprint tab (also in original Unreal Podcasts, Tutorials) everyone was saying dont use bindings, its better für the server to create your own code... thats why i heave deleted my old game and created the newone -.-

ok at first i will read the pdf about networking

[lime wren]

bindings works perfectly so i dont know why people say that

https://forums.unrealengine.com/t/how-to-create-an-hud-in-a-multiplayer-game/148009/7

[merry harness]

im also reading xD

[lime wren]

oh 😂

[lime wren]

yeah

for performance

i see why now

Yeah its true because binding tick everytime, so its not good for the player

So

If you want performance you can send the new health when, for example the player lost health

[merry harness]

yes

[lime wren]

but i think dont do this now

just learn multiplayer for now

[merry harness]

or you can check every second and not every tick

[lime wren]

i dont think you can do this

and it might be slow

not "real time" health

[merry harness]

a hit animation is slow and need 1-2 seconds

[lime wren]

it will be shift

if the player lost health

it need "10 seconds" to the player to know it

so bad solution

[merry harness]

what i mean is tick is too mutch ^^

[lime wren]

i think you cant change that

[merry harness]

i did in my HP Reg

[lime wren]

https://www.youtube.com/watch?v=CEMzBjLW1V4

[lime wren]

he explains the performance issues

[merry harness]

ah i know that video. The minimal have to be updated by tick 😦

[lime wren]

yes

so like you want

but for now dont change this

learn the basics of multiplayer and after, improve it 😉

[merry harness]

yes i will do !

ok Thank you after reading i will have questions xD

so i will come back ^^

[lime wren]

np 😉

[merry harness]

ok wow 111 sides, i will come back later ^^

[lime wren]

for now dont need to read everything

just read the fundamentals

like who have access to what

and how to do things

[kindred widget]

@merry harness @lime wren UMG bindings are also disliked because they incur extra overhead. For instance say you have a RPG stat widget with three different resource bars. Health, Stamina and Mana. If you bind all three of these individually, you end up with three functions being called on the object that each incurs overhead. One binging == one tick in this regard. So if you have three stat bars, three bindings is wasting performance that you would actually save by just updating those same bars on tick. And that is just for the function call before anything is done. This doesn't include multiple validity checks for the object you're getting the values from, etc. For instance, if you pull three values from the same character, why bother wasting two validity checks on three functions when you only need to check it once? Now, for simpler widgets, or one off widgets, this is fine. But then people get used to this method, and they start doing these bindings in places like large list views. Placing bindings on an informational widget that needs to update six things, per item and there can be dozens to hundreds of items.. and now you have lets say 50 items.. with six stats, 50x6=300bindings all being updated every single frame. When in reality it probably just needed updated once on construct when the widget was displayed.

That is a lot of unnecessary overhead for something as simple as displaying an inventory. UI tends to end up taking a fairly dumb amount of gametime from the CPU. Better habits now means either a better game or a potentially larger audience later.

[lime wren]

Yeah you're right

but for people who start multiplayer, i dont think the need to know how to "improve" for now

but yes you're right, binding ticks a lot

afterwards, these "ticks", are local

so it doesnt affect the server

[kindred widget]

Depends on the setup. If you're using a listenserver, it has it's own UI, and that UI can easily take time away from the rest of the game.

[lime wren]

yes

[wheat magnet]

is there any other way to run my game on separate computer?
i only have one computer and i want to test my game over internet
that's why i was using vmware

and in vmware my game isn't running, it say dx10 require to run the game

[hybrid zodiac]

Hi everyone, I've noticed that max player counts aren't being enforced on our servers, we had 24 people playing on a 12-person server last night. We are using the advanced sessions plugin and setting NumPublicConnections to the correct amount, does the sessions plugin not enforce player caps by default? Are we supposed to do something in InitNewPlayer?

[lime wren]

Install dx10

[wheat magnet]

i'm using vmware workstation

it have basic adapter display graphics by default as a primary gpu

[lime wren]

Hm

Weird

[errant glen]

Hey can someone guide me to something on how i can create global leaderboards (trackmania style) where everyone can see his time on a list compared to others

Id gladly pay someone if someone wants to create it for me

[meager spade]

#instructions if you are looking for someone to help

[errant glen]

Alright will check it out thanks @meager spade

[meager spade]

oops

[mighty zinc]

Hey, i have a problem in my game can i dm someone? I do not want to share it here

Private project

[wheat magnet]

@jolly siren need your help, few days ago you mentioned that the shooter game will work over internet

i tested in two separate computers, and it didn't find any server on other computer

[jolly siren]

Did you test through steam?

[wheat magnet]

@jolly siren

no i tested directly, just opened the game.exe and host server on one computer

and try to find session on other computer

[wheat magnet]

how to test with steam

i already have installed steam

[jolly siren]

I told you that you have to use an online subsystem, like steam to use sessions.

[wheat magnet]

isn't this is pre made project for learning purpose?

ShooterGame

[jolly siren]

yes

[quasi parrot]

Hi, did someone have good information about beacon in UE4, it does not say such thing as the timeout or other good informations.

[wheat magnet]

so it mean i need to add online subsystem to shooter project manually? does it by default steam?

does this project have steam subsystem by default?

[wheat magnet]

please explain, because does the shooter game have steam subsystem by default? or i need to do it manually

[jolly siren]

Please stop asking the same question over and over again

[wheat magnet]

so it means that this project works on local multiplayer, i want to test over internet, you mentioned that this will works over internet in two separate computers using listen server, it doesn't works.

[jolly siren]

yes, it has steam built in. But you need to change the steam app id to 480 (or an id that you own)

https://answers.unrealengine.com/questions/369108/shooter-game-multiplayer-problem.html

[wheat magnet]

thank you very much @jolly siren, i will try this and let you know if it works

[jolly siren]

np

[crystal crag]

Do you have to do anything special (within the context of multiplayer) with the ability system to play a montage with root motion enabled?

I heard they fixed the bugs surrounding the ASC's ability to handle RM, but I just tried it and I am getting some weird jittering.

hm... maybe it isn't an ASC problem. Maybe it is the way root motion is handled in general combined with how I am setting up the PC / pawn rotation

the jittering doesn't seem to be noticeable if the pawn is facing the same direction as the controller.

(I setup strafing movement in a similar manner as to the witcher)

[rain ledge]

So I will Make a Game with listen server and would use World Composition.. So i host a game with server travel and the world load but when the client now joints the world dont load, had anybody the ame problem and now how to fix it ?

[fierce grove]

hello guys, do you know a way to make the steam invite pop in game ? Like rocket league...?

tried with advance steam sessions but it doesnt seem to handle this use case

[jolly siren]

@crystal crag #gameplay-ability-system

[crystal crag]

I believe the ShooterGame has an example of this.

I think I recall it having a set of invite handlers in there at least

[fierce grove]

ummm ill have to dig into it

[crystal crag]

Hold on, I have it on my machine already. Let me confirm super quick.

Yep, from what I can tell it does:

[fierce grove]

um not really sure I should try that

I'll dig into it I'm not a pro cpp user 😉

[sullen kernel]

Just curious.. for dedicated server games. Does the client getting a list of dedicated servers available happen through the online subsytem?

[kindred widget]

AFAIK the OSS is responsible for detecting sessions regardless of whether it's listenserver or dedicated.

[rain ledge]

so i found this https://github.com/spatialos/UnrealGDK/issues/610 and PIE means Play in Editor or ? so if i packed the game, the world composition should load if the client joins ?

[jolly siren]

yes, PIE means play in editor

[rain ledge]

okey thank, sso i pack it to see if its realy so 😄

[fierce grove]

@crystal crag Well I need to test with 2 PCs if it does work with steam invite

[fierce grove]

I think that the "online framework" plugin, all CPP is handling pending invites

[young spoke]

Right so I have this damage vingette that appears when to a player when their health is below a certain point. But for some reason it only appears on the server. Here is the code. Any idea on how to make it appear on the correct player?

https://cdn.discordapp.com/attachments/714928089104122027/833431392213270538/unknown.png

https://cdn.discordapp.com/attachments/714928089104122027/833431687831486494/unknown.png

Take damage is called on the player recieving the damage
Hence the widget should be added to their viewport
But for some reason it always and only appears on the servers'

[lime wren]

because you execute this on the server

[young spoke]

I made an event

[lime wren]

(the widget)

[young spoke]

That was not replicated

and the same effect

[lime wren]

You need to add the widget IN your player controller

with an Run On Owning Client

rpc

[young spoke]

so just a run on owning client event?

make one and chuck it in there?

[lime wren]

Basically

its server code here ?

[young spoke]

I think so yes

yeah it is

[lime wren]

you have an server rpc ?

[young spoke]

not sure

[lime wren]

show me more left

[young spoke]

we use rpc sometimes

ok will do once the svn update finishes

[lime wren]

in multiplayer is obligatory

but basically, in your player controller create an RPC owning client and add the hud

In the server code

get your player pawn -> get controller -> and the rpc you created before

[young spoke]

what is an rpc?

I thought it was an event thing

[lime wren]

remote procedure call, for making actions on the server for example

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

[young spoke]

Ill send more left once the svn update finishes

[lime wren]

k

[crystal crag]

Does rotation not sync with the default character movement component?

I am facing a situation where, when playing in single PIE (no server), I don't observe any problems with locking on to the right target. If I play w/ dedicated server and execute the "lock on nearest target in view" logic, then it is all janky and never seems to work right

[lime wren]

character automatically replicates movement and rotations

[crystal crag]

ok

this is so weird

[lime wren]

how did you created it ?

[crystal crag]

I have a method that I call, which grabs the nearest target I am facing, and then sets orient rotation to movement as false and then sets bUsePawnControlRotation as true. I then have my character strafe around the enemy target.

if (IsCameraCurrentlyLocked)
        {
            if (!WasLockedPreviousFrame)
            {
                URaevinCharacterMovementComponent* RCMC = GetCharacterMovementComponent();
                if (RCMC != nullptr)
                {
                    UE_LOG(LogTemp, Warning, TEXT("Was NOT locked during previous frame, and we now are locked onto a target. Setting CMC's orient rotation to movement to false."));
                    RCMC->bOrientRotationToMovement = false;
                }
            }
            AActor* LockedTarget = CameraLockArm->GetTarget()->GetOwner();
            const FRotator NewRot = UKismetMathLibrary::FindLookAtRotation(GetActorLocation(), LockedTarget->GetActorLocation());
            SetActorRotation(NewRot, ETeleportType::None);
        }

[lime wren]

cpp its not for me sorry :/

[crystal crag]

Ah, no worries. At least I only am observing the behavior when using a dedicated server. That means somehow the client/server are not in sync for some reason

[lime wren]

put all on server

[lime wren]

do what i said ^

[young spoke]

but how does that fix the widget?

its still being run on the server

[young spoke]

TO be honest I have no clue what you mean

by rpc owning client