#multiplayer | Unreal Source | Page 380

graceful cave Mar 21, 2018, 6:42 PM

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no problem, congrats getting steam to actually work for you

sly basin Mar 21, 2018, 7:03 PM

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Spent an hour last night working out elaborate logic to make a shuffled array cooperate. Turns out I was using the wrong one in my loop.... Knew it was time for bed when I saw it.

inland pond Mar 21, 2018, 7:04 PM

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Does anyone know how to get access to the inactive state from the playercontroller? The event BeginInactiveState() is not exposed in Blueprints :S

graceful cave Mar 21, 2018, 7:08 PM

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@inland pond do you have a visual studio .sln file for your project or is it blueprint only?

inland pond Mar 21, 2018, 7:13 PM

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Currently its blueprint only I dont want to mix them yet ... Is it the only way of accessing the inactive state?

sly basin Mar 21, 2018, 7:14 PM

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If it's not exposed to blueprints in the code then you'd have to change it yourself

graceful cave Mar 21, 2018, 7:14 PM

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if the event is only available in c++ then i think so, but exposing the event to blueprint isnt hard

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some guys here helped me expose the PostSeamlessTravel event from c++ to blueprint which is also in the playercontroller

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so id imagine if you copied the code and replaced my event with yours it would work

inland pond Mar 21, 2018, 7:22 PM

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Exposing just means wrapping a blueprint callable delagate around the existing c++ event?

graceful cave Mar 21, 2018, 7:23 PM

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it will show up in the overrides list next to functions

inland pond Mar 21, 2018, 7:24 PM

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Okay ill try it my self and see if I success 😉 Thanks

graceful cave Mar 21, 2018, 7:24 PM

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📎 unknown.png

sly basin Mar 21, 2018, 7:24 PM

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One you wrap your head around it it's worth it. (c++ nub myself)

graceful cave Mar 21, 2018, 7:24 PM

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📎 unknown.png

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thats all the code required, just create a playercontroller c++ class from your content browser and replace PostSeamlessTravel with the even you want, then reparent your player controller blueprint to the c++ class

inland pond Mar 21, 2018, 7:26 PM

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Yeah if you get the api its pretty straight forward. -; Thanks for the snippet I will do this after eating ;P

hollow pulsar Mar 21, 2018, 7:47 PM

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Anyone in here know how to use the voice chat blueprints in advanced sessions?

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or anything on voice chat in unreal?

west rapids Mar 21, 2018, 10:54 PM

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Can anyone give me an example of an UNOWNED object?

brittle sinew Mar 21, 2018, 10:55 PM

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...I mean, any object on which you don't set an owner (or it isn't set by the engine)?

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Actors don't inherently have owners, even replicated ones.

west rapids Mar 21, 2018, 10:55 PM

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Anything you place in the level is server owned

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xcept the stuff possesed by players

brittle sinew Mar 21, 2018, 10:56 PM

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Not quite, no

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The server has authority over it, but ownership isn't exactly the same thing.

west rapids Mar 21, 2018, 10:57 PM

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ye server has always authority, but im trying to figure out when he owns something

brittle sinew Mar 21, 2018, 10:57 PM

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The "server" doesn't own something.

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Ownership is an actor.

west rapids Mar 21, 2018, 10:57 PM

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there are server owned actors

brittle sinew Mar 21, 2018, 10:58 PM

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Well, I guess it does depend on what you mean by "server". This gets a tad bit semantic-y for me, but I'll explain

west rapids Mar 21, 2018, 10:58 PM

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dedi server

brittle sinew Mar 21, 2018, 10:58 PM

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Let me explain :p

west rapids Mar 21, 2018, 10:58 PM

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k

brittle sinew Mar 21, 2018, 10:59 PM

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When you're talking about ownership, "server-owned" and "client-owned" refer to the PlayerControllers of the server and client, respectively.

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When you're talking about authority, "server" refers to the instance of the engine itself.

west rapids Mar 21, 2018, 11:00 PM

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aye, what im asking is if a server spawns something, does it "posess" it like a playercontroller posessing a pawn, or does it stay UNOWNED.

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Or if you place an basic box in the level, is it unowned or owned.

brittle sinew Mar 21, 2018, 11:00 PM

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Like I said above, actors don't inherently have an owner. If you spawn any normal actor, it's unowned.

west rapids Mar 21, 2018, 11:00 PM

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i see

brittle sinew Mar 21, 2018, 11:00 PM

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That said, the server still does have authority over it.

west rapids Mar 21, 2018, 11:02 PM

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ok so if a playercontroller posesses a pawn, and then requests the server to do something to that pawn, and then on the server that something is done on a run-on-owning-client event, it should only update for the client that made the request, not all clients that poses an instance of the pawn

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right?

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like the server doesnt have ownership of his copy of the playerpawn right?

brittle sinew Mar 21, 2018, 11:03 PM

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Correct—it would go to the client whose PlayerController owns the objct.

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Keep in mind, once again, the server still has authority over that pawn.

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It's what would be referred to as "client-owned", however.

west rapids Mar 21, 2018, 11:03 PM

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aye aye master/slave, just ownership is unclear sometimes

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since theres no way to check if something is unowned

brittle sinew Mar 21, 2018, 11:04 PM

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Yeah, the relationship between ownership and authority can be a tad confusing, especially with the term "server-owned"

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Well, you can check if its owner is null, no?

west rapids Mar 21, 2018, 11:04 PM

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i like to think as master/slave, much easier

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ha, didnt think of that 😄 tx

brittle sinew Mar 21, 2018, 11:05 PM

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Now that I think about it, it's actually probably not a great idea

west rapids Mar 21, 2018, 11:05 PM

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for testing its fine

brittle sinew Mar 21, 2018, 11:05 PM

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That would work on the server, but if you were on client A and client B owns the actor, it would seem the owner is null, since client B's PlayerController doesn't exist on client A

west rapids Mar 21, 2018, 11:06 PM

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yeah but since i wanna know ownership state with respect to teh server, its all good.

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main reason i was asking is cuz of this:

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https://gyazo.com/e6b7040b59ddc7170150573b7a4679f1

Gyazo

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and from what you said, it seems Server only owns things that are AIcontrolled, generally.

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so i can treat everything else like unowned

brittle sinew Mar 21, 2018, 11:08 PM

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Well, not necessarily. The server owns its own pawn.

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It can own anything, to be honest. It's just that actors don't have owners by default.

west rapids Mar 21, 2018, 11:11 PM

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Ok so does server get ownership parallel to clients, and everything else is unowned?

brittle sinew Mar 21, 2018, 11:13 PM

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It's not that the server and clients 'get' ownership per se, ownership must be assigned. It's just that engine code assigns an owner for a pawn when possessing it.

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There's nothing magical about how that's done; it's just what the engine does. You can do that with any actor you'd like.

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But yes, any actor spawned doesn't inherently have an owner—it's unowned.

west rapids Mar 21, 2018, 11:15 PM

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Great. That means with the exception of GM and AIC, server owns same things as a client. All i needed to know

brittle sinew Mar 21, 2018, 11:15 PM

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(and believe me, I know I'm getting a bit nit-picky, rofl)

west rapids Mar 21, 2018, 11:15 PM

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its cool, i don't mind extra info

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thanks for your time

brittle sinew Mar 21, 2018, 11:15 PM

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I don't believe the server owns the GameMode, but I could be wrong.

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The GameMode spawns controllers, so I don't really see how it could be owned by a controller

west rapids Mar 21, 2018, 11:16 PM

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it doesnt have to own them, they only exist there

brittle sinew Mar 21, 2018, 11:17 PM

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Yeah, sure. I just thought you might have been implying that those are server-owned

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If you weren't, my bad

west rapids Mar 21, 2018, 11:17 PM

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what i meant was that clients cant have access to it

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actually i did word it wrong, sorry 😛

brittle sinew Mar 21, 2018, 11:17 PM

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Yeah, that's true. That is a distinct concept from ownership, however.

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This is pretty technical terminology, but it kind of has to be =x

west rapids Mar 21, 2018, 11:18 PM

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i disagree

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all Epic had to do, is call it Pwnership

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Pwnership = technical, Ownership = Where things live 😄

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then again I guess pwnd is an old saying

inland pond Mar 22, 2018, 12:25 AM

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@graceful cave Thanks worked flawless!

grand kestrel Mar 22, 2018, 2:09 AM

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Trying to build prediction for an actor that gets pushed around, but as it has no owner I can't send an RPC to set the timestamp, Is there a nicer way to do it? (Setting the client/server timestamps on the server)

meager spade Mar 22, 2018, 2:51 AM

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I need a bit of insight/advice, when a player enters a new area, i wan't to activate spawners in that area, where would be the most logical way to handle this?

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The GameMode handles the spawning of bot's, but i can't send to the GameMode from the client unless im confused af.

wary willow Mar 22, 2018, 3:03 AM

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@meager spade Just create a spawner manager and have it in the world

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get the players locations at a set time

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spawn npcs around those closest

vital steeple Mar 22, 2018, 3:42 AM

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@thin stratus thanks for the clarification, i feel like that should be stickied 😄

winter plover Mar 22, 2018, 7:27 AM

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So I'm trying to reduce perceived lag with my prop interaction system, and in the pursuit of that I sometimes disable movement replication, so that physics manipulation is fully in control of the client until he lets go of whatever he's holding

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However so far I have only been able to disable replication serverside

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is there a way to basically tell the client to "ignore" incoming replication updates?

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based on a condition?

slim holly Mar 22, 2018, 7:42 AM

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I'm gonna go with no. Base idea is to not let client have control over movement correction

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you need to make your own character movement system that can ignore server, but be aware it opens a whole can of worms for multiplayer game explotation

winter plover Mar 22, 2018, 7:44 AM

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its not a character movement thing

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it's essentially carrying phys props not unlike the way you do it in halflife 2

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via physicshandles

slim holly Mar 22, 2018, 7:44 AM

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oh I see

winter plover Mar 22, 2018, 7:45 AM

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while a prop is being carried I want to ignore the server's positioning, because it just makes the clients perception jitter

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I dont worry much about authority

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because as soon as the client lets go it snaps back to the server's version

slim holly Mar 22, 2018, 7:45 AM

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depending on the interaction level, you could spawn a local copy and make the replicated one invisible

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until interaction stops

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I'm sure there are better ways to do it, but it's too early to remember

winter plover Mar 22, 2018, 7:46 AM

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the way I do it now is essentially "freezing" the prop in place until replication kicks in serverside again

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but it'd be better if I could just instantly apply replication again

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which needs me to control it clientside tho

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actually

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I think I might still have the same freeze then tho

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because the server would have to drop the object too

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oh well nvm I might have just answered my own questions

slim holly Mar 22, 2018, 7:48 AM

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actually

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right, so example: SetActorLocation running in both ends, and the target location is replicated, you should receive jitter-free movement because target location is synced with server w/ latency

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client can set actor locations, but replication will fix the location if it strays too far

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but if target location is nearly same in both ends, the jitter won't occur

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or, can occur during packet loss

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but there's nothing you can do with that

winter plover Mar 22, 2018, 7:53 AM

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so I basically do a server RPC in every tick of the held prop?

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to update my location?

slim holly Mar 22, 2018, 7:53 AM

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no no, you are already replicating your character that holds the prop

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so you can get the prop target location that way

winter plover Mar 22, 2018, 7:54 AM

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oh thats what I already sorta do

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my PropHoldingLocation() is dependent on the player camera

slim holly Mar 22, 2018, 7:54 AM

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well, you gotta replicate that somehow

winter plover Mar 22, 2018, 7:54 AM

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I mean it's a shared func

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both server and client use it to put the prop in place

slim holly Mar 22, 2018, 7:55 AM

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but what I mean, you can use existing logic to extrapolate information without doing extra replication

winter plover Mar 22, 2018, 7:55 AM

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im not quite following

slim holly Mar 22, 2018, 7:55 AM

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me neither, trying to follow class here

winter plover Mar 22, 2018, 7:56 AM

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oh okay dw then, we can talk about this later

grand kestrel Mar 22, 2018, 8:53 AM

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@winter plover I found replicate movement doesn't work with physics in any real world scenario. A miniscule and expected difference causes an entirely different outcome; there is no prediction and there is no interpolation

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Becomes nothing more than a jittering teleporting mess with any latency

winter plover Mar 22, 2018, 9:07 AM

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yea I kinda have that in mind

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altho curious to see how far I can push it

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in my small testing area it's been working fairly reliably

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there's only a handul of things that I still gotta find workarounds for

grand kestrel Mar 22, 2018, 9:10 AM

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Are you simulating latency

winter plover Mar 22, 2018, 9:13 AM

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yea

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its not exactly a "real scenario" yet

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its just a small map with a handful of things

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so I imagine as things move along, it will get trickier

grand kestrel Mar 22, 2018, 9:19 AM

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Ah

slim holly Mar 22, 2018, 10:03 AM

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The issue mostly is, physics engine does a lot of small errors constantly, which all contribute to larger error as time passes on

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which makes replication difficult

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say, at 3ms substep you'd be doing up to 33 error moves @ 100ms lag

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which results teleporting/corrections/jittering

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but something like carrying a prop, you could do manual math simulation of spring, then use rounded integer values to shave off errors, making replication more reliable

winter quail Mar 22, 2018, 10:20 AM

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Hey guys, does anyone know if you can change whether or not the client or the server is shown in the world outliner?

When I start a game with Play and number of players on 2, it shows the server in the world outliner. But when I eject to move around in the world and check some stuff, it ejects me into the client. But the world outliner is still showing all the server actors.

Can I change that?

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A maybe important detail. I do not work on a multiplayer game at the moment. I just have 2 instances of my app that communicate over a UDP connection, but run a total different level and gamemode and playercontroller. And to test both instances if they work together correctly I use the number of players option to test it.

It is not the normal multiplayer setup as you might expect so maybe that also creates an unexpected result with this. Just FYI.

thin stratus Mar 22, 2018, 10:35 AM

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📎 unknown.png

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@winter quail

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"Choose World"

winter quail Mar 22, 2018, 10:36 AM

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Oh cool thanks @thin stratus !

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And also thanks for your Network Compendium, read it last week for a personal project I want to start in my spare time 😄 It was really helpful to understand better how Multiplayer is setup in UE4 😄 @thin stratus

thin stratus Mar 22, 2018, 10:38 AM

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(: Glad it helps

oblique mountain Mar 22, 2018, 11:42 AM

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I have a little multiplayer problem. I have a linetrace and if there is a collision with the linetract the colliding component will be set to invisible. But this function is relplicated with the player replication. So when player A hit a cube with the linetrace the cube will be invisible for player A and player B

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The variables that stores the information about the invisible components is not set to replication

winged badger Mar 22, 2018, 11:46 AM

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you're doing linetrace from which class?

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if you can get a PlayerPawn from the class you're doing linetrace in, and you're doing it on Tick

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put a Branch IsLocallyControlled

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and if it is just set the Hidden for the cube locally, no replication required

oblique mountain Mar 22, 2018, 12:10 PM

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The Linetrace is from my Character an the Character need to be replicated

winged badger Mar 22, 2018, 1:26 PM

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point is

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each client can determine its visibility locally

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no need to replicate what's hit and what's hidden

oblique mountain Mar 22, 2018, 1:28 PM

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ok, good to know but the character need to be replicated so what can I do?

native moth Mar 22, 2018, 3:26 PM

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Quick question, does lan sessions in UE4 work cross platforms? I'm thinking about making a virtual camera type app on an iOS device, using ARKIT, that feeds it camera position, rotation etc. back to my server on a Windows PC. Is this possible using sessions or would I need to go into something else?

winged badger Mar 22, 2018, 4:31 PM

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@Lennard#4742 not sending RPCs for vision trace does not mean character can't be replicated

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2 completely separate issues

sudden frost Mar 22, 2018, 6:24 PM

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hey i have question

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it's better to make multiplayer mobile game in unreal or unity? XD

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unreal multiplayer can be created for free? 20 free ccu or something like that?

brittle sinew Mar 22, 2018, 6:34 PM

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What?

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There's no inherent cost for Unreal other than the 5% of sales.

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You need to provide matchmaking and hosting (if not using listen servers) yourself; Unreal doesn't provide anything like that for you.

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I have no idea what you mean by "20 free ccu" :p

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Concurrent users?

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If so, like I said there isn't any cost for anything like that—there isn't a "free" and "pro" version like Unity

sudden frost Mar 22, 2018, 6:38 PM

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ccu=current connected users

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max online xd

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so if i want to make a game i have to buy host for server?

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hmm?

wary willow Mar 22, 2018, 6:49 PM

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This isn't Unity

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https://unity3d.com/unity/features/multiplayer

Unity

Unity - Services - Multiplayer

Unity is the ultimate game development platform. Use Unity to build high-quality 3D and 2D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers.

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That's what he was talking about @brittle sinew

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TBH, if Epic did come out with something similar (hint @sweet sphinx ) I think it would be a grand moneymaker

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But also, make it much easier on most folks.

sudden frost Mar 22, 2018, 7:00 PM

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but i ask

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this cost anything?

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in unreal

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to create multiplayer

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[hosting? server? or they host it for free]

brittle sinew Mar 22, 2018, 7:01 PM

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No, Epic does not provide any first-party hosting.

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You either need to use listen servers (one player hosts the game while playing it) or set up dedicated servers.

sudden frost Mar 22, 2018, 7:02 PM

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fortnite etc use dedicated server yea?

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i guess 😄

brittle sinew Mar 22, 2018, 7:02 PM

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Yes.

sudden frost Mar 22, 2018, 7:03 PM

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where can i buy it?

brittle sinew Mar 22, 2018, 7:03 PM

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Pretty much any server host will work.

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A few examples are DigitalOcean, Linode, OVH, Vultr, etc.

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You can also host your own servers if you'd like, but be aware server host companies are paid, in a large part, for reliability.

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You can't guarantee reliability running a computer in your closet :p

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(not saying that you are...just as an example)

sudden frost Mar 22, 2018, 7:05 PM

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i have vps on ovh

brittle sinew Mar 22, 2018, 7:06 PM

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Okay, sure. As long as the VPS has the resources to run a server, that should work out fine

sudden frost Mar 22, 2018, 7:06 PM

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ok so this is possible to run server on vps? i have debian 7/8 probably

brittle sinew Mar 22, 2018, 7:07 PM

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Yes, it's possible, you would just need to package for the architecture/OS

twin juniper Mar 22, 2018, 7:35 PM

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I really am a fan of DigitalOcean.

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Though, their server locations in Asia is very limited, the best location is Singapore which is still very far from the main gamers (Korea, China, Japan).

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Google Cloud, and Amazon AWS are also both good, but more money. OVH is mostly Europe I believe.

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I have a friend who uses Vultr. He has a server in Australia.

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You should also think of location if that's important to you.

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I believe AWS has THE most server locations.

wary willow Mar 22, 2018, 8:05 PM

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meh

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Vultr

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Best one

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IMHO, but I don't wanna start a VPS war

twin juniper Mar 22, 2018, 8:06 PM

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xd

sudden frost Mar 22, 2018, 8:07 PM

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so there is no free way to create multiplayer? 😄

brittle sinew Mar 22, 2018, 8:10 PM

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Like I said above, listen servers are an option.

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Not the best option, but on a strict indie budget, they can be a valid choice.

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If you plan on releasing on Android, you might be able to make use of Google Play Games Services, which provides matchmaking.

sudden frost Mar 22, 2018, 8:14 PM

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but its paid yep?

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xdd

twin juniper Mar 22, 2018, 8:17 PM

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If you don't have at least a job, I don't think you should be trying to do game dev

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Lol

brittle sinew Mar 22, 2018, 8:17 PM

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No, it's provided alongside a published Google Play application.

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There is a one-time $25 fee in order to publish on Google Play, however.

wary willow Mar 22, 2018, 8:19 PM

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@twin juniper hmmm, that's not true, there are plenty of devs that come from being students

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there are a lot of free assets in place to use

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Look at that kid who made Unturned

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actually think he's even coming over to UE4 or already has

sudden frost Mar 22, 2018, 8:20 PM

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i mean that programing is my hobby :# i am making websites [design, backend (in nodejs too)],c++,c#,js for $ so yea i have a "job" XD

twin juniper Mar 22, 2018, 8:22 PM

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@wary willow If you are trying to do multiplayer. I just don't think it's very cost effective though lol

sudden frost Mar 22, 2018, 8:25 PM

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does Google Play Services offer real time service or what?

brittle sinew Mar 22, 2018, 8:28 PM

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They offer matchmaking.

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They don't offer hosting.

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That's where listen servers come in.

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https://developers.google.com/games/services/common/concepts/realtimeMultiplayer

Google Developers

Real-time Multiplayer | Play Games Services | Google...

rough aspen Mar 22, 2018, 10:33 PM

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Can someone help with projectile replication in multiplayer? (UE 4.18.3)
I have a simple setup, but for some reason when shooting happens, client spawns two projectiles for once.
I really don't know what to do here.
Here is the setup:
https://i.gyazo.com/d1faafbddec6ec22399296dda8857663.png
https://i.gyazo.com/00633ace3e7e694ff355051f3a1d08f6.png
https://i.gyazo.com/be92f0e04c944843fa4eae7fe944d4d5.png
And here is video of shooting, you can see info print in top left corner:
https://gyazo.com/88e50585ab9ace113838ff639fc9849a

Gyazo

▶ Play video

brittle sinew Mar 22, 2018, 10:38 PM

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What I would do in this situation is find the earliest point in the flow where something happens twice.

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Does the input event fire twice? Does the server RPC fire twice? Does the multicast RPC fire twice? Etc.

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Once you can figure out where that duplication occurs, finding the root of the issue will be much easier

rough aspen Mar 22, 2018, 10:39 PM

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but I don't understand what can be fired twice, it's like just one event lmb

brittle sinew Mar 22, 2018, 10:39 PM

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In situations like this, don't try to understand. Try to debug. :p

rough aspen Mar 22, 2018, 10:39 PM

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yeah that's what I'm doing last two hours 😄

brittle sinew Mar 22, 2018, 10:39 PM

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Once you find out exactly what is happening, finding out the why is next.

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Print strings are your friend (breakpoints aren't really feasible in MP)

rough aspen Mar 22, 2018, 10:42 PM

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okay then

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all events is firing once

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but for some reason, there is two projectiles

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so it's like, I don't know, fire event is fired only once, but I have print string in event begin play in my projectile and it's fired two times. It's like something wrong with SpawnActor node

inland pond Mar 22, 2018, 10:48 PM

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Mostly BeginPlay called twice because once on server and one time on client if its for instance a PlayerCharacter

rough aspen Mar 22, 2018, 10:49 PM

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okay but in my case it's called like this:
Client 0: call
Client 0: call
Server 0: call

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and begin play is not the real issue i can see two projectiles spawned on both client and server

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begin play is just being used to debug the issue

inland pond Mar 22, 2018, 10:51 PM

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Ohh okay ... Thats indeed a strange behavior ô.ó

rough aspen Mar 22, 2018, 10:51 PM

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yeah...

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I'm feeling like it could be some sort of an engine bug

inland pond Mar 22, 2018, 10:52 PM

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Btw why you are calling Server + Multicast?

rough aspen Mar 22, 2018, 10:53 PM

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Really - I don't know but it works this way, I'm new to multiplayer features, but if I use only multicast, it's not working, if only on server well then it's not working on clients

brittle sinew Mar 22, 2018, 10:53 PM

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It's definitely not an engine bug. 😛

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Multicasts happen on all clients, including the server.

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You're spawning one on the server, and one on every client.

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That's why the server only sees one, but clients see two.

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If you don't want the server's version to show up on clients, don't replicate it.

rough aspen Mar 22, 2018, 10:55 PM

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I'm feeling kind of stupid, okay so you mean like I need to check switch on authority maybe before firing events?

brittle sinew Mar 22, 2018, 10:56 PM

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Either spawn one on the server and replicate it or spawn a non-replicated version on all clients.

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Don't spawn a replicated version on all clients.

rough aspen Mar 22, 2018, 10:58 PM

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okay now I'm feeling like I need to hit my head with my hand I forgot that projectile can be replicated with a settings inside of it. Disabling the setting helped, thanks!

inland pond Mar 22, 2018, 11:51 PM

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Does anyone knows how I can execute a function on the server from the ThirdPersonChracter? I mean only from the clients player controller. If I use the SwitchHasAuthority node it will work but the server does not execute the function for him self 😲

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📎 unknown.png

graceful cave Mar 23, 2018, 12:11 AM

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set the replication type to "run on owning client"

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@inland pond

inland pond Mar 23, 2018, 12:12 AM

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I did this already and the function which was marked as run on owning client also fired 2 times 😮

graceful cave Mar 23, 2018, 12:12 AM

#

use switch has authority

#

basically just change the exec from authority to the event you have now

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and set it to run on owning client

winged badger Mar 23, 2018, 12:13 AM

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i don't get what you're trying to do there

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its a character, it can just do GetController on the server side

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its aware of how to fetch its own controller

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and why that code is even in the character, and not controller itself is also... strange

inland pond Mar 23, 2018, 12:15 AM

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@graceful cave kk Ill try that. Basically I just want to spawn the equipment on the server for each Chracter on event begin play

winged badger Mar 23, 2018, 12:15 AM

#

because there you could just do if(Authority) SpawnEquipment

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without any of the Getters or RPCs

inland pond Mar 23, 2018, 12:19 AM

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I thought that if every character spawns his own equipment by notifying the server would be a good idea 😮 @winged badger Okay Ill try that too

winged badger Mar 23, 2018, 12:19 AM

#

look, your character and your controller exist on client and server both

#

and they both execute BeginPlay and Tick

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so your client version of character doesn't need to notify server its time to BeingPlay

#

because server already knows that and calls BeginPlay on all actors that exist on server at roughly the same time

#

so you just need to filter it out so that SpawnEquipment executes on server only, which is what the Authority switch is for

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nothing else needs to be done

#

infact its the server that notified your client its time to BeginPlay

inland pond Mar 23, 2018, 12:24 AM

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Ohh gosh ... the last part definitly cleared it up. The first part I was already aware of but couldnt interprete it like you said here >.<

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One last thing I always questioned my self. When do I have to use events? Currently I always use events if some classes are talking to each other (PlayerController - GameMode) and I only use functions for internal use within the same class. Is that correct?

#

Or do I get only trouble when I try to return something from a function?

winged badger Mar 23, 2018, 12:28 AM

#

lets say you character has some enumeration for a state

#

say, Walking, Running, Jumping... doesn't matter

#

and your say, PlayerController needs to react when that state changes

#

(and im talking events as EventDispatchers in BP now)

#

you could put a check in PC on Tick to see what state the character is in

#

or you could call an event dispatcher in the Character whenever you Set the value of the enumeration

#

and have PC bind its own function/event to it

#

so it doesn't have to keep checking constantly, but instead gets Notified when the state changes

#

basically EventDispatcher is a multicast delegate that has an invocation list you can bind functions to, as long as the signatures match

#

and when its called/broadcast it executes all the functions on its invocation list

inland pond Mar 23, 2018, 12:33 AM

#

That makes totally sense! If I create a custom event within the blueprints well it isnt bind to any dispatcher (or is it) is it then just treated like a normal function ?

winged badger Mar 23, 2018, 12:36 AM

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it is

inland pond Mar 23, 2018, 12:37 AM

#

Okay nice thanks for all the great information!

graceful cave Mar 23, 2018, 12:55 AM

#

what are some things that might go wrong if the max packet size is set too high?

#

ive been having weird issues that sometimes print history overflow in the server logs, but ive been able to prevent that for all actors that caused it except for the character, who only updates 30 times per second

#

the most common symptom of the issue is the PostSeamlessTravel event not getting called

#

and sometimes players dont fully possess their character when joining and have to reconnect

#

its a new issue but i cant pin it down the logs dont reveal much

gloomy tiger Mar 23, 2018, 1:23 AM

#

Hey guys! Question -- I do have a Multicast event that receives an argument from the server. The client prints false whilst the server prints true.

#

📎 unknown.png

#

📎 unknown.png

brittle sinew Mar 23, 2018, 1:24 AM

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It's a replicated variable. Variable replication has no guarantee of order, especially in relation to RPCs.

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If you need that value to be consistent in the function, pass it as a parameter directly.

gloomy tiger Mar 23, 2018, 1:25 AM

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🤔

winged badger Mar 23, 2018, 1:26 AM

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is it a replicated variable?

gloomy tiger Mar 23, 2018, 1:26 AM

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Skill State is a stateful component.

winged badger Mar 23, 2018, 1:26 AM

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because the screen doesn't show it either way

brittle sinew Mar 23, 2018, 1:27 AM

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I'm referring to "Is Upgraded?" specifically

gloomy tiger Mar 23, 2018, 1:27 AM

#

So, Skill State is a stateful component. When the user clicks on a button, I change one variable from its state through:

#

📎 unknown.png

winged badger Mar 23, 2018, 1:28 AM

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ok, and how does the server know that?

gloomy tiger Mar 23, 2018, 1:28 AM

#

This is what I was doing:

#

📎 unknown.png

#

This is what's going on under the hood:

#

📎 unknown.png

#

Please, don't mind most of the logic in the BP--not useful for our case.

#

As you can see, it actually reaches the Prepare Skill (Multicast) event.

#

To the server, Chosen Skill has Is Upgraded? as true.

#

I'm trying to pass this same variable to the client and it refuses to consider it true (lol)

winged badger Mar 23, 2018, 1:32 AM

#

its generally better to set relevant variables on the server and let it replicate them to clients

#

the flow is more clear, and its more maintainable

gloomy tiger Mar 23, 2018, 1:32 AM

#

Not sure where I'm NOT doing this. 🤔

winged badger Mar 23, 2018, 1:33 AM

#

you are separately setting IsUpgraded? on client and server

gloomy tiger Mar 23, 2018, 1:33 AM

#

Nope.

winged badger Mar 23, 2018, 1:33 AM

#

you said the user clicks a button

#

at that point we are on client side exec only

gloomy tiger Mar 23, 2018, 1:34 AM

#

Oh, sorry, I haven't made myself clear.

#

Look.

#

📎 unknown.png

#

I'm binding the Upgrade event to respond to my button's click.,

#

Afterward, I'm getting the player controller and calling Request Upgrade Skill

#

which runs on the server

graceful cave Mar 23, 2018, 1:35 AM

#

the server doesnt know the widget exists, call a non replicated event in the player controller which then calls the replicated one

brittle sinew Mar 23, 2018, 1:35 AM

#

Like I was saying above, it's most likely the case that the variable simply hasn't propagated to clients by the time the RPC reaches them.

#

If you need the bool inside the function, pass it directly as a parameter, as primitives like that don't need to be replicated—they're just passed as data.

#

When you pass the reference to the component, it's just a pointer—it's not a copy of what the server sees...it only refers to the client's version of that component.

gloomy tiger Mar 23, 2018, 1:36 AM

#

The problem, @brittle sinew, is that I need the whole object because it contains required information.

winged badger Mar 23, 2018, 1:36 AM

#

the ResolveSkillCasting is a user triggered event? as in user activates a skill and then it executes, right?

brittle sinew Mar 23, 2018, 1:36 AM

#

If the bool hasn't been replicated down to the client yet, it would see it as false.

gloomy tiger Mar 23, 2018, 1:36 AM

#

But it makes complete sense.

winged badger Mar 23, 2018, 1:37 AM

#

which doesn't happen at the same time user clicks a different button to upgrade a skill

brittle sinew Mar 23, 2018, 1:37 AM

#

In that case, you might want to look into using a RepNotify, depending on if it works for your use case.

winged badger Mar 23, 2018, 1:37 AM

#

so its not the speed of propagation thing

#

because replication is always faster then you clicking 2 different buttons

gloomy tiger Mar 23, 2018, 1:37 AM

#

@winged badger Not actually. The user presses a key and calls a server event called Resolve Skill Casting (On Server) and this event calls the function Resolve Skill Casting.

winged badger Mar 23, 2018, 1:38 AM

#

but it can't happen at exactly the same time as user clicking a SkillUpgrade button

#

every time

#

my point being the setting of IsUpgraded? and the part where its not working are quite some time apart

brittle sinew Mar 23, 2018, 1:39 AM

#

I would disagree with blanketing the statement of "because replication is always faster then you clicking 2 different buttons" onto everything

#

It depends on a lot of factors, including net priority and current network situation

gloomy tiger Mar 23, 2018, 1:40 AM

#

🤔

brittle sinew Mar 23, 2018, 1:40 AM

#

Variable replication is generally slower than RPCs

winged badger Mar 23, 2018, 1:40 AM

#

even if NetPriority is low and the network is clogged it would still work most of the time

gloomy tiger Mar 23, 2018, 1:41 AM

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Well, but I think my problem is specifically on what @brittle sinew mentioned--replicating an object.

winged badger Mar 23, 2018, 1:41 AM

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so, which has the correct state of IsUpgraded? server or client?

gloomy tiger Mar 23, 2018, 1:41 AM

#

He was right--the IsUpgraded? variable works if I pass it alone.

#

Server.

winged badger Mar 23, 2018, 1:42 AM

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and is the variable itself replicated?

gloomy tiger Mar 23, 2018, 1:42 AM

#

Yes.

#

Oh

#

Look this

winged badger Mar 23, 2018, 1:43 AM

#

and the SkillState is an ActorComponent, also replicated?

gloomy tiger Mar 23, 2018, 1:43 AM

#

📎 unknown.png

#

Mhm. That's a good question. This ActorComponent is created and attached on-the-fly. I don't have an option like Component Replicates?.

winged badger Mar 23, 2018, 1:44 AM

#

SetReplicates

gloomy tiger Mar 23, 2018, 1:44 AM

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Ok, so, observe the image above.

winged badger Mar 23, 2018, 1:44 AM

#

from where you're creating it

gloomy tiger Mar 23, 2018, 1:44 AM

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If I run Upgrade (Server) on all (as Multicast), it works.

#

GEEZ

#

That also worked @winged badger

#

And I think is WAY MORE convenient than setting IsUpgraded? through a Multicast event.

winged badger Mar 23, 2018, 1:45 AM

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your ChosenSkill variable was replicated

gloomy tiger Mar 23, 2018, 1:46 AM

#

It was not. Until now.

winged badger Mar 23, 2018, 1:46 AM

#

so the owner object of that variable (also replicated) could access it and set a variable inside ChosenSkill

#

ah, okay

wary willow Mar 23, 2018, 1:46 AM

#

I am actually a bit confused by the logic though. Why does anyone but Server need to know if a player upgraded?

#

Is this information presented to other clients?

winged badger Mar 23, 2018, 1:47 AM

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so it was not the same ChosenSkill on both client and server

gloomy tiger Mar 23, 2018, 1:47 AM

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Not to other clients, just the owner @wary willow

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@winged badger seems it was not. :/ You solved the mystery!

wary willow Mar 23, 2018, 1:47 AM

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So you have been going about this the wrong way

winged badger Mar 23, 2018, 1:47 AM

#

and as long as class/instance of which the variable is a member doesn't replicate, setting the variable to replicate does nothing

gloomy tiger Mar 23, 2018, 1:48 AM

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@winged badger gonna save this on my Google Keep, lol

#

Thank you so much!

#

Also, thank you everyone else that helped me. 👍

winged badger Mar 23, 2018, 1:49 AM

#

btw, you do not need a ServerRPC after that Authority switch

#

you already guaranteed you're on server execution at that point

gloomy tiger Mar 23, 2018, 1:49 AM

#

Where exactly?

winged badger Mar 23, 2018, 1:49 AM

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CastSkill (Server)

gloomy tiger Mar 23, 2018, 1:50 AM

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🤔

#

Oh, gotcha.

#

That's only an habit I have to make clear to myself that I am working on a ServerRPC.

winged badger Mar 23, 2018, 1:50 AM

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commenting a node also works 😃

gloomy tiger Mar 23, 2018, 1:51 AM

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Yeah, you're right.

heavy marlin Mar 23, 2018, 8:05 AM

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wait a minute who says replication is generally slower than RPC's?

#

just because of the delta checking or what?

grand kestrel Mar 23, 2018, 9:02 AM

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RPCs are sent when you call them, at least with UDP, TCP waits for a sufficient buffer, replication waits until the next replication tick 🤷 That's my understanding

zinc crater Mar 23, 2018, 9:12 AM

#

Hello everyone!

Did somebody solved the problems into Aim Offset replication for ThirdPerson? We're having a hard time. We have seen every single video, and documentation about it. Somebody got it working correctly in their projects ?

grand kestrel Mar 23, 2018, 9:13 AM

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It's already replicated out of the box, use GetBaseAimRotation node

zinc crater Mar 23, 2018, 9:13 AM

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server to clients works for us, clients don't replicate.

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😦

#

we will have a check again tho, thanks 😃

grand kestrel Mar 23, 2018, 9:21 AM

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I can guarantee you it is because someone once got into a massive argument with me and eventually found out it was 😛

zinc crater Mar 23, 2018, 9:23 AM

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hahahahaha

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I believe you Vaei

#

Thanks man. I apreciate it.

#

Anyway, I may get back to you if we fuck up.

thin stratus Mar 23, 2018, 10:47 AM

#

Anyone up with a bit of knowledge about UE4's way of client prediction?

#

What exactly are they doing/using?

grand kestrel Mar 23, 2018, 10:58 AM

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@thin stratus It's enormous, what are you trying to achieve? Are you making your own version?

thin stratus Mar 23, 2018, 10:58 AM

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Depends. I have a Pawn driven by Physics and a Ball Actor driven by Physics

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And I want to see, what Epic does for these to predict location etc.

#

And what I could add to make it totally smooth

grand kestrel Mar 23, 2018, 11:03 AM

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In that case, it'd be best to just walk through CMC and see how it handles it's prediction, but it takes a lot of time, you can find some more minimal examples if you Google around for building prediction with physx

#

There's a github here, though I wasn't too fond of some of his concepts @drowsy notch think this is yours? https://github.com/Acren/ue4-client-prediction

GitHub

Acren/ue4-client-prediction

ue4-client-prediction - UE4 Client Prediction Experiment

#

I remember seeing a good explanation too, if I can find it

#

I know TheJamsh has a git too where he's recreated CMC prediction

#

Which would be a lot less convoluted to look at

#

If you scroll down a few posts here MykonCodes explains how he handled it
https://forums.unrealengine.com/development-discussion/c-gameplay-programming/81522-physics-bullet-client-side-prediction/page4

Physics (Bullet) Client-side prediction - Unreal Engine F...

For gameplay programmers writing C++ code.

#

That ball will not work based on how CMC does it unless it has an owner, because it sends timestamps back and forth

#

via RPC

#

Sorry @thin stratus I know it's not exactly what you were looking for but hopefully it'll get you started, maybe someone can answer your question a little more eloquently

heavy marlin Mar 23, 2018, 11:38 AM

#

nice links thanks

heavy marlin Mar 23, 2018, 12:05 PM

#

does anyone think RPC validate methods are horrible?

#

i mean if you return false the client gets booted

#

its not a soft validation to see if you can perform the rpc or not

grand kestrel Mar 23, 2018, 12:09 PM

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I've wondered, just don't really consider myself knowledgeable enough to say that

heavy marlin Mar 23, 2018, 12:10 PM

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hmm

#

if i spawn an actor in a server RPC and immediately call a client RPC with that actor as a parameter, its not going to work is it

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it doesnt give it time for the client to spawn it

grand kestrel Mar 23, 2018, 12:11 PM

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Probably not, the replication wont have had time to spawn it

#

Why not put it in begin play with a !HasAuthority()

heavy marlin Mar 23, 2018, 12:12 PM

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the client RPC call you mean?

#

yeah that might be the way to do it

thin stratus Mar 23, 2018, 12:41 PM

#

Thanks for the links! Was in a client call so couldn't answer

#

James told me, that basic RepMovement doesn't do much other than hardsetting the location

#

I wonder if that comes with a timestamp already

#

Will look into the CMC then I guess :x

thin stratus Mar 23, 2018, 12:57 PM

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I'll look into it in the weekend

#

Maybe I can figure out a basic custom MC that gives the prediction like I want it

grand kestrel Mar 23, 2018, 1:04 PM

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Yeah, replicate movement is largely useless

#

Because the server will replicate the position at a time in the past (due to latency)

#

Kinda surprised they don't have some basic prediction and smoothing built into AActor and for physics tbh

thin stratus Mar 23, 2018, 1:17 PM

#

Well it's also that they don't seem to have any Entity Interpolation

#

Unreal Tournament might have that though

#

Cause in a fast game you can't really predict where a player goes between two updates

#

So you'd need to show the known info, which places the enemy you see back in time (at least on your end)

#

And if you then shoot at him, the server needs to recreate the state, otherwise you always miss

#

Cause in the actual state, he's already on server update further (or even more, with few ms of ping)

full bane Mar 23, 2018, 1:49 PM

#

Does anyone have experience with the replay system?

gusty raptor Mar 23, 2018, 2:04 PM

#

Hi, guys.. good afternoon

#

im looking for a way to replicate attach and deatach in c++ .. Anyone knows something about it...?

heavy marlin Mar 23, 2018, 5:37 PM

#

i think you can only do it via RPC

gusty raptor Mar 23, 2018, 5:48 PM

#

@heavy marlin RPC ? im not sure about what to do

oblique mountain Mar 23, 2018, 6:20 PM

#

@winged badger "@oblique mountain not sending RPCs for vision trace does not mean character can't be replicated
2 completely separate issues" but how can I stop sending RPC's for vision trace?

magic helm Mar 23, 2018, 6:30 PM

#

Try running it only on the server and set a Boolean that has RepNotify(which can affect non server versions)

oblique mountain Mar 23, 2018, 6:32 PM

#

"I have a little multiplayer problem. I have a linetrace and if there is a collision with the linetract the colliding component will be set to invisible. But this function is relplicated with the player replication. So when player A hit a cube with the linetrace the cube will be invisible for player A and player B
The variables that stores the information about the invisible components is not set to replication"

#

this was my problem and its not a problem with a variable

sudden frost Mar 23, 2018, 6:41 PM

#

can u recommend any tutorials for creating multiplayer mobile game? i cant find a good one :# xd

meager spade Mar 23, 2018, 7:22 PM

#

ugh, why is my ai not animating on client screen?

#

📎 2018-03-23_19_21_58-Zombz_-_Unreal_Editor.png

hollow pulsar Mar 23, 2018, 8:22 PM

#

This script only destroys player 1 not the colliding player any solutions?

📎 unknown.png

brittle sinew Mar 23, 2018, 8:26 PM

#

...maybe plug the "other actor" pin into Destroy Actor?

#

I mean, everything you need is right there in the screenshot :p

#

Keep in mind that that would destroy any overlapping actor, so if you want to only destroy players, you can try casting it to pawn/your character type, and if it succeeds, do the destroying

hollow pulsar Mar 23, 2018, 8:29 PM

#

Thank you

#

It works perfectly now

grand kestrel Mar 23, 2018, 11:02 PM

#

@thin stratus UT stores player positions for x amount of time and rebuilds the game world so it can tell where you were when you shot and where the other players were, same as source engine

high heart Mar 24, 2018, 12:13 AM

#

Does using a bool in an RPC really use 32 bits? just read that here: https://answers.unrealengine.com/questions/711689/why-does-serializing-a-bool-use-4-bytes.html

Seems totally insane. Thinking I would be better off just using an enum instead of 2 bools as it'd use 8 bits as opposed to 64

#

(@here, also let me know if this sort of tagging is inappropriate)

fossil spoke Mar 24, 2018, 12:15 AM

#

You cant use @here you dont have the rights.

high heart Mar 24, 2018, 12:16 AM

#

fair enough

fossil spoke Mar 24, 2018, 12:16 AM

#

@everyone will also not work for obvious reasons

high heart Mar 24, 2018, 12:16 AM

#

wait, are you saying it literally does nothing when i use it?

fossil spoke Mar 24, 2018, 12:17 AM

#

Yes

high heart Mar 24, 2018, 12:18 AM

#

oh, good to know. Anyways, what's up with networked bools? would I be better off just using a crazy enum to represent whatever states I need?

#

Additionally, what is the most efficient method of transferring data like this?

fossil spoke Mar 24, 2018, 12:25 AM

#

Test it out and see

#

Do some research

#

You already know what you want to test, so just do it 😃

high heart Mar 24, 2018, 12:26 AM

#

I am doing it. just trying to get some input so I don't waste time doing something dumb

#

😛

fossil spoke Mar 24, 2018, 12:27 AM

#

Arriving at an conclusion where you learn something is never wasted time.

high heart Mar 24, 2018, 12:28 AM

#

truth

grand kestrel Mar 24, 2018, 12:34 AM

#

@high heart Can probably use uint8
uint8 bMyCondition:1

#

And you can assign them just the same as a bool, bMyCondition = false

high heart Mar 24, 2018, 12:43 AM

#

right on. That'd be about the same as an enum though... so in that case I guess it'd be best to use an enum to represent more than one bool

grand kestrel Mar 24, 2018, 12:46 AM

#

As most enums inherit from uint8 -- yep

#

You can also pack a lot into a single uint8

high heart Mar 24, 2018, 12:51 AM

#

yeah i was thinking a bitmask might be appropriate. idk if it's really necessary though unless i had a ton of data. enums are pretty

wary willow Mar 24, 2018, 1:32 AM

#

Yup

#

enum are easily readable

grand kestrel Mar 24, 2018, 1:41 AM

#

Yeah you only use a bitmask when you need a bitmask

wary willow Mar 24, 2018, 1:46 AM

#

Hm, anyone notice any bugs relating to SpawnActor and setting the owner there via Self?

obsidian epoch Mar 24, 2018, 2:19 AM

#

How complex of a task would making a LAN multilayer game into one that can be hosted on a server on AWS or somewhere be?

hollow pulsar Mar 24, 2018, 2:42 AM

#

Can anyone point me towards a simple damage system for a multiplayer fps?

#

Any help would be greatful 😄

pallid mesa Mar 24, 2018, 5:25 AM

#

Make a health component

burnt meteor Mar 24, 2018, 5:30 AM

#

what is the target file instructions for ue4.19?

kind bay Mar 24, 2018, 6:51 AM

#

Hey Hive Mind! Quick question! When replicating a variable on a pawn, is player controller that is possessing the pawn considered the owner for the replicated condition?

fossil spoke Mar 24, 2018, 7:03 AM

#

@kind bay The Owner for the case of Replication Condition is quite literally the Actor that owns that variable.

#

So an variable on your Pawn that has Skip Owner as an RepCond would mean that it wont be replicated to the Players version of the Pawn but clients who are simulating that Pawn will get it.

#

https://docs.unrealengine.com/en-us/Gameplay/Networking/Actors/Properties/Conditions

kind bay Mar 24, 2018, 7:09 AM

#

Hrmm okay, I think I understand that. I am currently using Rep Notify to update variables which for the client end only effect the HUD, the data is only relevant for the client that is possessing the character. I just want to make sure that I am not updating the variable on all clients as that would waste bandwidth. What do I need to do to make sure that this is the case? (bare with me I am fairly new to game dev)

fossil spoke Mar 24, 2018, 7:10 AM

#

OwnerOnly would be what you want.

kind bay Mar 24, 2018, 7:10 AM

#

Thanks!

thin stratus Mar 24, 2018, 7:41 AM

#

@grand kestrel Yeah so enetity interpolation and lag compensation

#

Will do some Research today

#

And test a bit

grand kestrel Mar 24, 2018, 7:50 AM

#

@thin stratus helpful info
https://gafferongames.com/post/snapshot_interpolation/
http://www.gabrielgambetta.com/client-server-game-architecture.html

#

Both those sites are great resources

#

To understand the concepts

thin stratus Mar 24, 2018, 7:50 AM

#

Yeah read the gambetta one yesterday

#

Right now the concept is the smaller problem

#

Cmc is the bigger one hehe

grand kestrel Mar 24, 2018, 7:51 AM

#

Indeed

#

Cmc gets a lot of flak, and for good reason, but it's a treasure trove of knowledge for networking and character movement in general

#

Just..not easy to read

thin stratus Mar 24, 2018, 8:01 AM

#

Have you ever read the shootergame code

#

Like trying to understand what they do where and when (without knowing it upfront)?

#

Kinda hope it's not less easy to read than sg

grand kestrel Mar 24, 2018, 8:06 AM

#

Haven't read it

fossil spoke Mar 24, 2018, 8:07 AM

#

CMC is pretty bad IMO lol, once you get the broad strokes though it starts to make sense.

thin stratus Mar 24, 2018, 8:15 AM

#

Welp, first the test project, then the code stuff.
Or rather, first a coffee.

slim holly Mar 24, 2018, 8:16 AM

#

every great deed starts with coffee

grand kestrel Mar 24, 2018, 9:39 AM

#

I'm about to start on something ludicrous too

thin stratus Mar 24, 2018, 9:43 AM

#

Oh?

grand kestrel Mar 24, 2018, 9:45 AM

#

We want to run multiple servers that share info (in real time) to lift the player limit that results from the limitation of processing power on one thread

thin stratus Mar 24, 2018, 9:57 AM

#

Ah right, so you need to have the data outside the servers

#

Well that sounds interesting too. If only I had more time on my hands :D

#

On another note, how can you align the Editor Windows again when playing with like 3 players?

grand kestrel Mar 24, 2018, 10:00 AM

#

Is there a shortcut or something that aligns them? I'm not sure

#

Mine tend to stay where I put them

thin stratus Mar 24, 2018, 10:04 AM

#

I saw people having them auto size and auto align

#

I mean if they stay it's also fine

#

@nocturne token I remember you having something to properly align and size new editor windows when testing multiplayer. Was that something handcrafted or in editor?

inland pond Mar 24, 2018, 10:26 AM

#

Could someone explain to me why those 2 approaches are working within 2 instances of PIE but not in the standalone? Isnt the server also the owning client of his own PlayerController? Edit: Solved it

📎 unknown.png

night jay Mar 24, 2018, 10:59 AM

#

Guys question, do widgets spawn on dedicated servers?

#

Or more importantly, does the code inside the widgets execute on dedis

vocal dagger Mar 24, 2018, 11:32 AM

#

@night jay I would guess it's not

thin stratus Mar 24, 2018, 12:00 PM

#

@grand kestrel Could it be, that there is no Client Smoothing in the Listen Server?

#

Yo @balmy gazelle , didn't you say last time ListenServers have no ClientSmoothing?

#

At least on the Character CMC

balmy gazelle Mar 24, 2018, 12:02 PM

#

Have client smooth but isn't working properly

#

And don't work properly only from the Listen Server view <happen with the Character Movement Component>

#

The clients see correctly AI driven by the server and the Listen Server

#

Is backlogged by Epic and no idea why don't fix it so :/

#

Is reported on UDN and Forums and Answehub from what I know

thin stratus Mar 24, 2018, 12:08 PM

#

Alright

#

Just wanted to get that straight

#

Just tested to see what the CMC does and what not

gusty raptor Mar 24, 2018, 12:10 PM

#

Hi, anyone knows how to replicate attach / detach ?

balmy gazelle Mar 24, 2018, 12:13 PM

#

@thin stratus note is hard to see in low hz monitors, if the character don't run etc But is pretty clear with 120hz monitors and 60fps videos, probably at 60hz monitors too
And try to replicate it in local usually don't give the expected bug view. But you can easy see it in any tom looman video

thin stratus Mar 24, 2018, 12:13 PM

#

I already reproduced it

#

Now checking how a non CMC actor looks when moving him

#

And then starting to look into the cmc

balmy gazelle Mar 24, 2018, 12:18 PM

#

I think the report was this one by the way https://issues.unrealengine.com/issue/UE-32005

#

says affect 4.12.2 but affect them all atleast since 4.5 I think

#

If helps someone here is this aswell https://answers.unrealengine.com/questions/358869/clients-jitter-on-listen-server.html
But nothing of that worked for me back in the time

#

someone told me some studios edited the code but they never shared it I imagine by their NDA etc

#

so that is all I can help you with

thin stratus Mar 24, 2018, 12:35 PM

#

Thanks!

night jay Mar 24, 2018, 12:41 PM

#

Oh wow that's a pretty big issue

lament kettle Mar 24, 2018, 1:23 PM

#

📎 unknown.png

#

Can this be improved?

burnt meteor Mar 24, 2018, 1:24 PM

#

what is the target file instructions for ue4.19?

lament kettle Mar 24, 2018, 1:24 PM

#

I am sending data from the Client to the server. And then the Clients (all other machines) are setting the data on the local pawn.

burnt meteor Mar 24, 2018, 1:24 PM

#

@lament kettle yes

thin stratus Mar 24, 2018, 1:24 PM

#

I assume it can be improved

burnt meteor Mar 24, 2018, 1:24 PM

#

do u want to make it secure?

lament kettle Mar 24, 2018, 1:24 PM

#

Well, yes, it probably can. But it's not bad is it eXi?

burnt meteor Mar 24, 2018, 1:24 PM

#

hmm. its bad

thin stratus Mar 24, 2018, 1:25 PM

#

Looking at it, yes it's bad :D

burnt meteor Mar 24, 2018, 1:25 PM

#

😃

lament kettle Mar 24, 2018, 1:25 PM

#

How do I improve it then?

burnt meteor Mar 24, 2018, 1:25 PM

#

😃

thin stratus Mar 24, 2018, 1:25 PM

#

Well, even without thinking about security, this is generally a weird flow of logic

burnt meteor Mar 24, 2018, 1:25 PM

#

yes

thin stratus Mar 24, 2018, 1:25 PM

#

What calls the top left event?

lament kettle Mar 24, 2018, 1:25 PM

#

Event Tick

burnt meteor Mar 24, 2018, 1:25 PM

#

i think u learnt this from the vid tut on youtube by epic right?

thin stratus Mar 24, 2018, 1:26 PM

#

Limited to an instance or on everyone?

burnt meteor Mar 24, 2018, 1:26 PM

#

Quick Question what is the target file instructions for ue4.19?

lament kettle Mar 24, 2018, 1:26 PM

#

Uhh, every player controller has this event tick.

thin stratus Mar 24, 2018, 1:26 PM

#

Server.Target?

burnt meteor Mar 24, 2018, 1:26 PM

#

yes

thin stratus Mar 24, 2018, 1:26 PM

#

Hm no idea right now, sorry

burnt meteor Mar 24, 2018, 1:26 PM

#

hmm.

thin stratus Mar 24, 2018, 1:26 PM

#

@lament kettle Well so you are directly calling that in Tick

#

That means it calls on Server and Local Client

burnt meteor Mar 24, 2018, 1:27 PM

#

should i try 18?

thin stratus Mar 24, 2018, 1:27 PM

#

Idk sorry

lament kettle Mar 24, 2018, 1:27 PM

#

How do I grab the mouse position of the client, without running this on the client?

thin stratus Mar 24, 2018, 1:27 PM

#

It's fine to call it on the Client

burnt meteor Mar 24, 2018, 1:27 PM

#

📎 net.pdf

thin stratus Mar 24, 2018, 1:27 PM

#

But the PlayerController doesn't exist on the other clients

burnt meteor Mar 24, 2018, 1:27 PM

#

download this pdf by credric

lament kettle Mar 24, 2018, 1:28 PM

#

That's fine. I wanted it to work that way.

#

If you are the Pawn, and you're controlling it, you do this code.

#

If you are the Pawn, and you're just some other guy, you do this part of the code instead.

thin stratus Mar 24, 2018, 1:29 PM

#

Yeah okay let's say the posted code should only run on Client and Server

#

And never reach other clients

#

(cause it won't)

#

Then you don't have to do that weird ClientRPC -> ServerRPC

#

You are calling it on tick

#

It already calls on Server and Client

#

So if SWITCH HAS AUTHORITY -> REMOTE -> ServerRPC passing the Rotation

#

That's it

lament kettle Mar 24, 2018, 1:30 PM

#

If i do that, it only updates for everyone else, but not me.

thin stratus Mar 24, 2018, 1:31 PM

#

Is that a ListenServer?

lament kettle Mar 24, 2018, 1:31 PM

#

No, dedicated server.

burnt meteor Mar 24, 2018, 1:31 PM

#

..

#

version?@lament kettle

lament kettle Mar 24, 2018, 1:31 PM

#

4.19

thin stratus Mar 24, 2018, 1:31 PM

#

Well, you technically only need to do this:

meager spade Mar 24, 2018, 1:32 PM

#

What would cause my enemy animation from not playing on a client but works on the server?

thin stratus Mar 24, 2018, 1:32 PM

#

Set the Rotation variable to OnRep.
In the OnRep function, set the Rotation of the controlled pawn by it

#

On Tick, check if Authority or Remote

meager spade Mar 24, 2018, 1:32 PM

#

its a Anim Blueprint

thin stratus Mar 24, 2018, 1:32 PM

#

On Remote, do a ServerRPC and pass the Mouse Location.
In addition also Set the Rotation of the pawn directly

#

In the ServerRPC, set the Rotation variable

#

However I don't quite get why this is even needed tbh

#

This should technically be placed in the Character

#

So that the other players get the control rotation

#

Cause you are just taking a client value, replicating it and that results in teh client getting the value back that he already passed

#

So the only thing you could do is passing the Server the rotation and that's it

#

(in the playercontroller)

lament kettle Mar 24, 2018, 1:34 PM

#

Ah, I see. Let me see if I can implement what you said.

thin stratus Mar 24, 2018, 1:34 PM

#

Don't get me wrong, maybe I don't understand your goal

#

But you are working in a Class that only exists on Server and Local client.
Passing values between these two is all you can do.

#

You can't reach the other clients with that class alone.

lament kettle Mar 24, 2018, 1:35 PM

#

But when I'm running on a dedicated server on a local machine, I see the other characters rotating?

thin stratus Mar 24, 2018, 1:35 PM

#

So a Replicated Variable does only replicate to the Client who send the rotation in the first place.
So a more sensemaking thing would be just ServerRPC to the Server and he gets the Value for what ever reason

#

https://puu.sh/zOwdf/32fd0a7fe0.png

#

You are sending the Server the local rotation of the mouse

#

Which then replicates to the local person who send the rotation

#

Why would that need to be replicated

lament kettle Mar 24, 2018, 1:53 PM

#

📎 unknown.png

#

📎 unknown.png

#

So something like this?

#

I tried to simulate lag, and it works good too.

#

The client doesn't have lag, but the networked clients are laggy.

thin stratus Mar 24, 2018, 1:58 PM

#

On the local client (remote) you'll want to instantly call SetActorRotation on the Pawn

rancid current Mar 24, 2018, 1:58 PM

#

Ey guys I got an annoying issue lol, I'm grabbing a player reference from the player state and using it in game state but for some freaking reason even tho on the player state the variable works on game state its empty o.O null... why? ;-;

thin stratus Mar 24, 2018, 1:58 PM

#

Otherwise the client has to wait on the Server updating it

#

Show your code @rancid current

rancid current Mar 24, 2018, 2:00 PM

#

@thin stratus https://gyazo.com/394b804bd1655d260d198687ec782eeb
https://gyazo.com/e02cf0324bac5b7445c6b8e6ec8c9df8

Gyazo

#

Zcharacter ref and scoreboard widget always giving null in game state but works in player state x.x

thin stratus Mar 24, 2018, 2:01 PM

#

BeginPlay in Character is too early

#

BeginPlay calls before the Character is possessed

#

Use OnPossessed

rancid current Mar 24, 2018, 2:01 PM

#

i've got a delay set up to make sure it has enough time

thin stratus Mar 24, 2018, 2:01 PM

#

(Calls only on server)

#

Delay's for networking are shit

#

Use the proper events

rancid current Mar 24, 2018, 2:01 PM

#

i mean timer by function name x.x

thin stratus Mar 24, 2018, 2:02 PM

#

Doesn't matter

#

Use the Event Possessed

#

Get the PlayerState from the passed Controller reference

#

And set the variable on that

rancid current Mar 24, 2018, 2:03 PM

#

oh wait i did some sht on the controller before and i forgot to test it after last night lol gimme just a bit to try it out, i made a refernece on the player controller when the player is spawned and possesd

#

but okeh thanks i will try that if this doesn't work! Lots of thanks!

#

@thin stratus eyyy im back haha alright so what i did now the player reference works, and im trying to get a reference of one of it's widgets, but that is giving me null.. print shows only server tho and server has no access to widgets anyways right? x.x

thin stratus Mar 24, 2018, 2:12 PM

#

You gotta make sure that, what ever you are acessing on a client, is actually available

#

Only because you set a Value on the Server to replicate to the client doesn't mean it's instantly available

#

Use RepNotify on the variable on only update your widgest then

rancid current Mar 24, 2018, 2:13 PM

#

repnotify on the widget variable u mean? o.o

thin stratus Mar 24, 2018, 2:14 PM

#

On the Character variable or what ever you want to access in the widget

rancid current Mar 24, 2018, 2:15 PM

#

okeh i see!

Thanks lots! 😄

thin stratus Mar 24, 2018, 2:18 PM

#

The CMC is in fact a minefield. It's hard to even find out where it starts

#

I might just leave it aside for now and just create a fresh component in which I implement my own prediction code.
Don't need the CMC for a ball or a hoverdrone anyway

lament kettle Mar 24, 2018, 2:19 PM

#

📎 unknown.png

#

When I run dedicated server, everything works fine.

#

When I run local listener, the clients can't update. Only the server can.

thin stratus Mar 24, 2018, 2:19 PM

#

You said you are using a DedicatedServer

#

Not that you are using both

lament kettle Mar 24, 2018, 2:19 PM

#

Yes, I am.

#

Oh.

burnt meteor Mar 24, 2018, 2:20 PM

#

lol

lament kettle Mar 24, 2018, 2:20 PM

#

Do I lose performance if I do both?

thin stratus Mar 24, 2018, 2:20 PM

#

No but it's different cases

lament kettle Mar 24, 2018, 2:20 PM

#

Ah.

#

No worries.

thin stratus Mar 24, 2018, 2:20 PM

#

Right now you are only sending the Data from the Clients

lament kettle Mar 24, 2018, 2:20 PM

#

It doesn't matter, I'm using GameSparks + AmazonServers

thin stratus Mar 24, 2018, 2:20 PM

#

A ListenServer is not a client

#

Well actually

#

You do both

#

It shouldn't break

burnt meteor Mar 24, 2018, 2:20 PM

#

wait, wait , AmazonFreeServers?

#

VPN?

lament kettle Mar 24, 2018, 2:21 PM

#

No.

#

I plan to do this.

burnt meteor Mar 24, 2018, 2:21 PM

#

ok

lament kettle Mar 24, 2018, 2:21 PM

#

GameSparks --> NodeJS server (runs dynamic servers when needed) --> Amazon Servers

thin stratus Mar 24, 2018, 2:21 PM

#

So Amazon AWS not GameLift?

lament kettle Mar 24, 2018, 2:21 PM

#

I'm not using gamelift because it costs more money.

thin stratus Mar 24, 2018, 2:22 PM

#

Fair enough

#

I do not see why your code wouldn't work with a ListenServer

#

But if you do what you just said, then ListenServers aren't important anyway

burnt meteor Mar 24, 2018, 2:22 PM

#

hm..

winged badger Mar 24, 2018, 2:23 PM

#

the is dedicated server branch is redundant, i mean you are fetching the variable from listen server and then setting it back in itself

lament kettle Mar 24, 2018, 2:24 PM

#

Well I'm running on a tick. Why would I want the server to run the ServerRPC?

winged badger Mar 24, 2018, 2:24 PM

#

i mean, listen server doesn't have to do it either

hidden mural Mar 24, 2018, 2:34 PM

#

Hey guys - really quick C++ networking question

#

I have an actor (ADungeonGenerator) which generates a tile-based map on BeginPlay

#

Also, it has a SetTile(x, y, newTile) function, which modifies the map during play (i.e., a player carves a block out - imagine digging in minecraft)

#

so I want this SetTile to replicate to the Server from the Client, even though the client doesnt own the ADungeonGenerator instance

#

...how?

winged badger Mar 24, 2018, 2:36 PM

#

how do you store the tiles?

hidden mural Mar 24, 2018, 2:37 PM

#

it's a custom class, TArray2D<typename Type, int Size>

winged badger Mar 24, 2018, 2:37 PM

#

and what engine class are they derived from?

hidden mural Mar 24, 2018, 2:37 PM

#

the tiles themselves are just a UENUM which is like { None, Dirt, Brick }

winged badger Mar 24, 2018, 2:38 PM

#

what you want to do is replicate the tiles themselves, not the function changing it

#

any client that wasn't connected when the tile was changed, or wasn't NetRelevant for any other reason wouldn't get an updated state with replicating a function approach

hidden mural Mar 24, 2018, 2:39 PM

#

that makes sense actually

winged badger Mar 24, 2018, 2:39 PM

#

if you really wanted to push function answer would be

#

blueprint or code?

hidden mural Mar 24, 2018, 2:40 PM

#

code 😃

winged badger Mar 24, 2018, 2:42 PM

#

// in .h
UFUNCTION(NetMulticast, Reliable)
void SetTile(int x, int y, ETileType newTile);

// in .cpp
void YourClass::SetTile_Implementation(int x, int y, ETileType newTile)
{
    <function body>
}

#

that would execute SetTile on all clients

#

that are connected and NetRelevant

hidden mural Mar 24, 2018, 2:44 PM

#

and you can call that from a client?

#

or only server?

winged badger Mar 24, 2018, 2:44 PM

#

only server

hidden mural Mar 24, 2018, 2:44 PM

#

Okay cool... so this is the bit I'm missing, I have that and a SetTile_Server which calls through to the Multicast

winged badger Mar 24, 2018, 2:44 PM

#

when client player is affecting a tile

#

InputAction -> ServerRPC (which moves exec to server version of your character/PC, from where you can freely interact with server objects)

#

then you affect the tile from server's version of your character, controller, of anything else attached to the controller

#

which are the objects that are owned by your client, only ones that can send ServerRPC

hidden mural Mar 24, 2018, 2:46 PM

#

ahhh yes, that'll do it

#

so my problem is i'm trying to jump from client => server inside the ADungeonGenerator, whereas I should make the jump inside the PC/Pawn when the input occurs and we've worked out which tile to modify

winged badger Mar 24, 2018, 2:47 PM

#

yes

#

Input->LootChest->ServerLootChest doesn't work

#

because Chest is not owned by your client

#

Input->ServerLootChest(inside owned object)->LootChest does

hidden mural Mar 24, 2018, 2:48 PM

#

makes perfect sense actually, cool

#

so that's the function approach - but say i wanted to instead replicate my 2d array variable in the dungeon generator, is there a way to do that?

#

it's a TArray2D (my own class) which internally is just a large C-array

winged badger Mar 24, 2018, 2:50 PM

#

is it an UObject?

hidden mural Mar 24, 2018, 2:50 PM

#

hehe, nope... that's going to be a problem, isnt it?

winged badger Mar 24, 2018, 2:51 PM

#

yes

#

most common approach is making a TArray<FTileStruct>

#

inside a class that does replicate

#

make it a replicated UPROPERTY

#

and then any struct properties that are marked as UPROPERTY() will replicate

hidden mural Mar 24, 2018, 2:53 PM

#

okay... so 2 questions on that...

#

a replicated TArray... that'll call a OnRep_* function if i set it up in the properties (RepNotify or something)

#

is that called only when the array is assigned or when its data is changed?

winged badger Mar 24, 2018, 2:54 PM

#

in code its:

#

// in .h
virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

UPROPERTY(Replicated, ReplicatedUsing = OnRep_TileArray, ...)
TArray<FTile> DungeonTiles;
UFUNCTION() void OnRep_TileArray();

//in .cpp
#include "UnrealNetwork.h"

void MyClass::GetlifeTimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(MyClass, DungeonTiles);
}

hidden mural Mar 24, 2018, 2:59 PM

#

okay, and I guess the array has to contain UObjects that have replicated properties in them for that to work - i.e. i couldnt just have my DungeonTiles as a TArray<ETileType> for example?

winged badger Mar 24, 2018, 2:59 PM

#

you can

hidden mural Mar 24, 2018, 2:59 PM

#

that's cool... so that is probably a better way to do that then

#

and when that array changes thru OnRep_ I can get the client/server/whatever version to talk to the ADungeonChunk actors to mark them as dirty so their geometry is re-created

winged badger Mar 24, 2018, 3:00 PM

#

cheaper for bandwidth, definetely

#

OnRep is called after the new value is already on the client, so you'll have to back it up if you want to contrast and compare what's changed

hidden mural Mar 24, 2018, 3:01 PM

#

that's cool, i don't need the old value to re-create the geometry anyways

#

although actually I think maybe I'm still approaching it the wrong way

#

because all operations on the tiles will be on the server anyway, so i guess the map array might not need replicating after all

#

as long as i can mark the chunks that have changed on all clients

winged badger Mar 24, 2018, 3:02 PM

#

clients still need to know what the tile should look like

hidden mural Mar 24, 2018, 3:02 PM

#

heh, of course

#

so they'd still need to check the map to find the current state

winged badger Mar 24, 2018, 3:03 PM

#

and array of bytes is as cheap as it comes when replication is concerned

hidden mural Mar 24, 2018, 3:03 PM

#

thats awesome then

winged badger Mar 24, 2018, 3:03 PM

#

a mental note for you

#

forgetting to call Super::GetLifetimeReplicatedProps can cause really weird bugs

hidden mural Mar 24, 2018, 3:04 PM

#

so the plan is, use server RPCs from the PC/Pawn to call SetTile(x, y, tile). server replicates this tile data to all clients, and also marks changed chunk actors as dirty (bChunkDirty, which also replicates)

#

client chunks check the dirty flag and re-generate if needed

#

haha, oh yeah - i've run into that one before

#

actually forgetting Super anywhere causes weird bugs (BeginPlay, PossessedBy, that sort of thing)

winged badger Mar 24, 2018, 3:05 PM

#

this one is special tho

#

if you do it in GameStateBase it won't replicate the MatchState

#

result being client's won't call BeginPlay

hidden mural Mar 24, 2018, 3:06 PM

#

haha oh wow... yeah, that's gonna cause some issues!

#

anyways, many thanks for your help - now to try and implement it 😃

winged badger Mar 24, 2018, 3:06 PM

#

backing up is cheaper i think

#

then having server notify clients about dirty tiles

#

OnRep compares the array with backed up array

#

calls UpdateGeometry if any elements don't match (provided number of tiles doesn't change)

#

and then backs it up

hidden mural Mar 24, 2018, 3:08 PM

#

sounds reasonable i think

#

i mean it would be marking chunks rather than tiles as dirty, and each chunk i think is 16x16 tiles

#

so maybe not so bad?

winged badger Mar 24, 2018, 3:08 PM

#

nod

hidden mural Mar 24, 2018, 3:08 PM

#

but yes, thanks for your help 😄

winged badger Mar 24, 2018, 3:08 PM

#

yw

night jay Mar 24, 2018, 3:15 PM

#

Does a dedicated server have a playerstate?

winged badger Mar 24, 2018, 3:34 PM

#

Controllers have PlayerState

slate veldt Mar 24, 2018, 6:47 PM

#

Do I have to restart Editor to disable Single Process PIE?

winged badger Mar 24, 2018, 6:50 PM

#

no, just need to uncheck it in Advanced settings under play

slate veldt Mar 24, 2018, 6:53 PM

#

Hmm, still hitting the warning for ServerTravel

#

Still hitting this despite it being unchecked in advanced settings

📎 unknown.png

versed socket Mar 24, 2018, 6:58 PM

#

Stupid question @slate veldt : is it best practice to call check(variable) instead of the other idiom, if (variable) or if (variable != nullptr)?

slate veldt Mar 24, 2018, 6:59 PM

#

Come again?

#

That's engine code above

#

It seems MultiprocessOSS is not in the command line

#

I've worked out a get around hack for now, just place a breakpoint on the if statement,and drag execution down to the next if statement

#

Seems to create the server as wanted

hollow pulsar Mar 24, 2018, 11:16 PM

#

https://blueprintue.com/blueprint/sgrq448f/ I have this respawn sytem but it respawns the player who got the kill not the person who died

BlueprintUE.com

anonymous

Multiplayer Repsawn System

fossil spoke Mar 24, 2018, 11:22 PM

#

@hollow pulsar Calling DestroyActor like that is not correct at all

#

DestroyActor(self) should be the last node, anything called after it will not occur (because the Actor is now destroyed)

#

How are you calling CheckPlayerIsDead?

hollow pulsar Mar 24, 2018, 11:24 PM

#

On Event Tick

fossil spoke Mar 24, 2018, 11:25 PM

#

Ok well thats a bad design choice

#

You want to favor Event Driven Design over using Tick to check state every single frame.

#

For example

#

You have your Event AnyDamage that handles modifying the Player Health when they get damaged correct?

hollow pulsar Mar 24, 2018, 11:26 PM

#

Yes

fossil spoke Mar 24, 2018, 11:27 PM

#

When you modify the Health in that EVENT, you can then check to see if its <= zero.

#

If it is, that means the Player died.

#

So with that knowledge you can then simply call an function that handles respawning that Player.

#

No need to check if they are dead on Tick because we can alrready deduce that state after we apply damage to them.

#

Does that make sense?

hollow pulsar Mar 24, 2018, 11:29 PM

#

Yeah But now I still have the respawning the Issue not very sure how to do that.

fossil spoke Mar 24, 2018, 11:29 PM

#

Ok well respawning is quite simple, you had the right idea just that you werent doing it in the correct order.

#

You need to Spawn an new Character for that Player BEFORE you destroy the one that Died.

winged badger Mar 24, 2018, 11:31 PM

#

or handle it in the PlayerController

#

it belongs there, really

fossil spoke Mar 24, 2018, 11:31 PM

#

Handle it wherever you like, the fact that you were trying to Destroy the pawn that died before spawning an new one was incorrect.

hollow pulsar Mar 24, 2018, 11:33 PM

#

Alright but now I still have the same problem of the player earning the kill being respawned.

winged badger Mar 24, 2018, 11:33 PM

#

if he calls the Posses with input of PlayerController(0) from the client, it does nothing

#

if he calls it on the server, odds are its the wrong PC

hollow pulsar Mar 24, 2018, 11:34 PM

#

How would I select the correct PC?

winged badger Mar 24, 2018, 11:34 PM

#

GetPlayerController(0) works reliably on clients

#

since (unless you're doing splitscreen) its the only one

#

the entire logic for respawning should be in PlayerController

#

where the correct PlayerController is "self"

#

so when your character's health drops enough for it to die, call an event dispatcher

#

and bind RespawnPawn event in the PC to it

#

then your controller gets notified on your pawn's death and can do its stuff

#

all of this has to execute on server for it to take, ofc

hollow pulsar Mar 24, 2018, 11:37 PM

#

Ok Im gonna sound Like a complete Idiot but where do I find my player controller? Is it in the actor?

winged badger Mar 24, 2018, 11:38 PM

#

if you did not make a custom PlayerController class, now's the time

#

PlayerController is the very top of client's hierarchy of owned objects

fossil spoke Mar 24, 2018, 11:39 PM

#

@hollow pulsar Simplest respawn you could ever make.

📎 Capture.JPG

winged badger Mar 24, 2018, 11:39 PM

#

anything attached to it is owned by the client

fossil spoke Mar 24, 2018, 11:39 PM

#

Not how i would do it, but its as simple as you could get

#

Anyway i gotta bounce.

#

Good luck

winged badger Mar 24, 2018, 11:41 PM

#

(as long as it doesn't exec on client) 😄

fossil spoke Mar 24, 2018, 11:41 PM

#

It cant

#

AnyDamage is Server Side only

winged badger Mar 24, 2018, 11:41 PM

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ah, engine event

fossil spoke Mar 24, 2018, 11:42 PM

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Take note though that AnyDamage is also called if the damage that was applied was handled as Point or Radial damage as well.

rancid current Mar 24, 2018, 11:56 PM

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Ey guys! I would like a quick suggestion to my issue lol so finally starting to do tests on dedicated servers and sht, and ah I've got a problem with my movement component for my character, because of the lag its making the character jitter A LOT x.x honestly i still remember a long time ago this didn't use to happen when i was simulating lag haha but now it does so I would like to know what are the options to get rid of this? Im using unreal's movement component btw ^^

hollow pulsar Mar 25, 2018, 2:50 AM

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@fossil spoke Player two wont fire with this script anymore any Idea whats wrong?

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https://blueprintue.com/blueprint/blc_467i/

BlueprintUE.com

anonymous

Fire Script

meager spade Mar 25, 2018, 2:57 AM

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wont fire or the damage won't get applied?

hollow pulsar Mar 25, 2018, 2:57 AM

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Both

meager spade Mar 25, 2018, 2:58 AM

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because if it is the latter, then that is because only the server can apply damage

hollow pulsar Mar 25, 2018, 2:58 AM

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Wait

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Only server can apply damage? I had it working previously

meager spade Mar 25, 2018, 2:59 AM

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was you just running one instance? and was you firing on the server?

hollow pulsar Mar 25, 2018, 2:59 AM

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Yes

meager spade Mar 25, 2018, 3:00 AM

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so like i said only server can apply damage

hollow pulsar Mar 25, 2018, 3:01 AM

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So how can I make it to where both players can apply damage?

meager spade Mar 25, 2018, 3:01 AM

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your second player fires, sends the apply damage to the server, the server then applies the damage.

hollow pulsar Mar 25, 2018, 3:02 AM

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And now it works .----. Thanks you very much

meager spade Mar 25, 2018, 3:02 AM

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what did you do?

hollow pulsar Mar 25, 2018, 3:03 AM

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I dont know to be honest with you.

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Ok now If I go through the main menu and join on a different client player 2 still cant damag

meager spade Mar 25, 2018, 3:08 AM

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https://blueprintue.com/blueprint/xa01gm0s/

BlueprintUE.com

anonymous

Here

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something a bit like that, replace the bad node

hollow pulsar Mar 25, 2018, 3:09 AM

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replace the bad node with?

meager spade Mar 25, 2018, 3:10 AM

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the cast you had before

hollow pulsar Mar 25, 2018, 3:11 AM

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wait

meager spade Mar 25, 2018, 3:12 AM

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so basically create a custom event called Apply Damage

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📎 2018-03-25_04_11_41-Zombz_-_Unreal_Editor.png

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and replace the Apply Damage with the custom event you just created

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📎 2018-03-25_04_13_54-Zombz_-_Unreal_Editor.png

grand kestrel Mar 25, 2018, 3:16 AM

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When you PIE with dedicated server checked, is it going to be loading the map 2x? One for server one for client? We have a large map that takes notably longer with dedicated server, just want to double check that's what is happening

hollow pulsar Mar 25, 2018, 3:17 AM

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Still having the same issue

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If you'd like I can send the whole code

meager spade Mar 25, 2018, 3:17 AM

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yeah can do

hollow pulsar Mar 25, 2018, 3:18 AM

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https://blueprintue.com/blueprint/yl-mq9or/

BlueprintUE.com

Olin3D

ThirdPersonCharacter

meager spade Mar 25, 2018, 3:28 AM

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your fire event is running on the server, and it is doing line traces from there

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from the server, not the client

hollow pulsar Mar 25, 2018, 3:30 AM

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Big thanks man

meager spade Mar 25, 2018, 3:30 AM

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set that event to not replicated, does it work now?

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i am quite new to multiplayer myself, so i am learning aswell

hollow pulsar Mar 25, 2018, 3:31 AM

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Its working

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With it set to not replicated

meager spade Mar 25, 2018, 3:31 AM

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😃

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the only thing that has to be run on the server is the actual applying of damage, a client cant damage another client or the server, the server has to actually apply the damage

hollow pulsar Mar 25, 2018, 3:33 AM

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Well anyways again Big Thanks for that.

hollow pulsar Mar 25, 2018, 7:13 AM

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@fossil spoke Your basic respawn isnt working for me.

fossil spoke Mar 25, 2018, 7:13 AM

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How so?

hollow pulsar Mar 25, 2018, 7:15 AM

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Ill show you the compile error 1 second

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📎 unknown.png

fossil spoke Mar 25, 2018, 7:17 AM

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Your Cast isnt even hooked up?

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Right click the Cast node and down the bottom it says Convert to Pure

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Also, right click the Possess node and Refresh it.

hollow pulsar Mar 25, 2018, 7:19 AM

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Alright two problems now

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This ak stays when the player dissappears

📎 unknown.png

fossil spoke Mar 25, 2018, 7:20 AM

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Well yeah of course it would, you spawned it yourself, you need to manage destroying it yourself as well.

burnt meteor Mar 25, 2018, 7:20 AM

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ue4.19 is trash

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slow!!! and soo many errors while building the dedicated server

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it works fine with others lmao

fossil spoke Mar 25, 2018, 7:22 AM

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No you cant do that. You would need to call Destroy on it yourself when the Character is also Destroyed.

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Appropriate object management is an important fundamental to understand.

burnt meteor Mar 25, 2018, 7:25 AM

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yes

fossil spoke Mar 25, 2018, 7:28 AM

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GameMode has an FindPlayerStart() function

fleet sluice Mar 25, 2018, 7:49 AM

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First of all, you should follow Epic's documentation as many times as it takes to understand OOP (object-oriented-programming). BPs are built on top of C++ and therefore they behave identically (conceptually).

Secondly, you need to create your own debugging workflow (i.e. I add PrintStrings on hundreds of functions without verifying anything, only to see when they get called because that gives me a good idea on the big picture).

Thirdly, we are living in the age of Google. Everything you asked about so far has answers 1-2 searches and 5 secs away. Coming to a public community and expecting strangers to spoonfeed you is a complete lack of interest and respect of those strangers' time.

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And in case you choose to take this as offensive and not constructive, I'm a guy who learnt BP and quite advanced C++ 100% on his own, with the help of Epic's docs and Google and almost never with the help of the community. Toughen up.

grand kestrel Mar 25, 2018, 8:20 AM

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Brutal and true 😛

twin juniper Mar 25, 2018, 9:22 AM

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@fleet sluice I agree with this, although I think it's different for various people. I personally find it extremely difficult to read and understand things based on documentation, but when talking to people on here things just somehow "click" in 20 minutes.

I've been trying to cut down on coming to here specifically because I was afraid it came off as though I'm asking to get spoonfed; But in reality I just feel helpless when learning a new topic and thus far sometimes only the explanations from people like @grand kestrel (who had to endure me for multiple hours yesterday) push me over that wall.

Did he delete his message, by the way? What did he say?

fleet sluice Mar 25, 2018, 9:37 AM

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@twin juniper Yea, looks like he had deleted his last few messages. I agree with what you said almost entirely.

I may be a little too far gone towards the "solo" end of the spectrum, but I think reading the "Getting Started" parts of the docs should be a common sense minimum before asking questions because if someone can't even understand that, they're wasting their own time and there's objectively no reason they should be here. And it's highly unlikely someone can't understand the "Getting Started" sections. In the case above, the person didn't even know what the execution line and pins meant, then went on asking about casting. I'm willing to bet 10-year olds would understand that in a matter of minutes.

twin juniper Mar 25, 2018, 10:16 AM

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@fleet sluice Oh, I see.

sudden frost Mar 25, 2018, 10:51 AM

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is gamesparks a good service to use to create mobile game? 😄

twin juniper Mar 25, 2018, 11:20 AM

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I don't know, I'm not sure this is the right place to ask, either.

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Thanks in advance 😃

meager spade Mar 25, 2018, 11:26 AM

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anyone know why animation blueprint would not be running on my AI if it's set to replicated?

twin juniper Mar 25, 2018, 11:27 AM

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Depends on what exactly is being replicated there that you expect the animation blueprint to read to adjust the animation to

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If your animation blueprint isn't working properly, chances are you're losing some context on the client.

meager spade Mar 25, 2018, 11:29 AM

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it is just a basic locomotion blueprint which gets the ai forward vector and plays the animation. nothing fancy yet, just it works on the server not the client. curious as to what i am missing because my players animations replicate fine

twin juniper Mar 25, 2018, 11:31 AM

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If I recall correctly, when I needed to replicate my character's line of sight (I did this in blueprints) I had to move it to a separate variable that contained it, was set every tick an then replicated to the client at a reasonable frequency. I'm certainly not an expert, but it seems to me like this is the way to go if you want control over what your animation blueprint is actually receiving.

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I think for whatever reason my camera's rotation wasn't replicated so I had to move it to another variable. Maybe your problem is similar.

meager spade Mar 25, 2018, 11:32 AM

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i kinda just figured the animation blueprint would replicate with the component. As i see no option in the actual anim blueprint to replicate

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unless i am blind:D

twin juniper Mar 25, 2018, 11:34 AM

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well, I just threw in my two cents. I'm really the last person that should be answering questions on here, I think.

meager spade Mar 25, 2018, 11:36 AM

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ah got it kinda working, it plays the idle state now, one step at a time 😃

fleet sluice Mar 25, 2018, 11:37 AM

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@meager spade Animation BPs work by reading and reacting to various variables (i.e. character velocity). If your anim BP script relies on AAIController classes, only the server-side version will have access to those and the client-side animations wouldn't know a thing about them.

winged badger Mar 25, 2018, 11:37 AM

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@twin juniper you can generally do line of sight traces locally

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without using any network bandwidth

fleet sluice Mar 25, 2018, 11:38 AM

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Imagine having your animation BP play a random state based on a variable, but that variable is set to X on the server and Y on the client. Server and clients would see 2 different states.

meager spade Mar 25, 2018, 11:40 AM

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yeah, so GetVelocity comes from the player controller?

📎 2018-03-25_12_40_20-Zombz_-_Unreal_Editor.png

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so that is my issue then 😄

winged badger Mar 25, 2018, 11:41 AM

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AI controllers don't exist on clients, so they can't be replicated

fleet sluice Mar 25, 2018, 11:41 AM

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+1 to Zlo

twin juniper Mar 25, 2018, 11:42 AM

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By line of sight I really just mean the look rotation

fleet sluice Mar 25, 2018, 11:42 AM

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The easy way to do this would be to base the animation BP on characters, since those are replicated by default.

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And ignore controllers inside the animation BPs.

winged badger Mar 25, 2018, 11:43 AM

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its ok for look rotation

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Line of sight can easily end up being 100+ vectors, and replicating those on Tick would be a few too many 😃

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(for example, you throw a vision trace in every direction so you can obscure items that are behind walls, closed doors... etc from view in a top down game)

meager spade Mar 25, 2018, 11:51 AM

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@fleet sluice So get velocity is called from the controller, even if you call it throught the character?

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or is that from the Movement Component?

winged badger Mar 25, 2018, 11:52 AM

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you're already getting it through the character

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you just stored the variable in the controller

meager spade Mar 25, 2018, 11:53 AM

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what an idiot i am, brb

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working now, thanks 😃

twin juniper Mar 25, 2018, 1:12 PM

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Reposting a question from above, hopefully that's okay.

I'm trying to replicate a chatlog, which is an array of structs that represent the message. I'm doing this like so:

h:

void GetLifetimeReplicatedProps(TArray< FLifetimeProperty > & OutLifetimeProps) const override;

    UPROPERTY(BlueprintReadWrite, ReplicatedUsing = OnRep_PlayerChatLog)
    TArray<FSaeglopurChatMessage> PlayerChatLog;

    UFUNCTION()
    void OnRep_PlayerChatLog();

cpp:

void ASaeglopurPawn::OnRep_PlayerChatLog()
{
    OnPlayerChatUpdate.Broadcast();
}

void ASaeglopurPawn::GetLifetimeReplicatedProps(TArray< FLifetimeProperty > & OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(ASaeglopurPawn, PlayerChatLog);
}

I'm following an article, and that's really about all it says I really need for replication of a property. However, it doesn't seem to replicate. Any idea why that could be? I do set the actor's replication to true via SetReplicates() function.

fleet sluice Mar 25, 2018, 1:14 PM

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I think TArray's only replicate pointers, but maybe someone else can shed some more light

twin juniper Mar 25, 2018, 1:14 PM

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Oh, is that so? In that case I might end up having to use RPC

thin stratus Mar 25, 2018, 1:15 PM

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The bigger question is: Why replicating the whole history

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Why not sending one RPC with the newest message and let Clients keep their own history

twin juniper Mar 25, 2018, 1:15 PM

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I guess just trying to figure out how replication works in the first place

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First time doing it in C++

thin stratus Mar 25, 2018, 1:16 PM

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Well in general this should work. Setting the Array should trigger a RepNotify

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However Arrays are kinda special with RepNotify

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At least in Blueprints I usually set the Array with itself after modifying it

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Cause "Add" or just setting an element might not trigger that

twin juniper Mar 25, 2018, 1:16 PM

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That would make so much sense

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wow I didn't even think of that being the case

thin stratus Mar 25, 2018, 1:17 PM

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But that's just me making sure that it repnotifies. There might be some more info about that but I never asked

twin juniper Mar 25, 2018, 1:17 PM

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Yeah, lemme try this real quick

thin stratus Mar 25, 2018, 1:17 PM

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But even then, I wouldn't use that RepNotify for a message log

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If at all, then with a condition to only replicate ONCE at the start, for new players (if you want them to get the old log)

twin juniper Mar 25, 2018, 1:17 PM

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Yeah, it makes sense, bandwidth and all that

thin stratus Mar 25, 2018, 1:18 PM

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Yes

twin juniper Mar 25, 2018, 1:18 PM

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Roger-roger I'll just get a beginplay RPC to duplicate the server's version of chatlog with relevant entries

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so it keeps the public chat

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on relogs and stuff like that

winged badger Mar 25, 2018, 1:20 PM

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Replicated, ReplicatedUsing = <Function name>

twin juniper Mar 25, 2018, 1:20 PM

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Oh, I thought it was an either-or situation

winged badger Mar 25, 2018, 1:21 PM

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also, only UPROPERTY() marked properties in struct will replicate

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and not replicating the whole array but just the latest message is a far better approach, as Cedric suggested

meager spade Mar 25, 2018, 1:22 PM

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could you not always mark the struct dirty ?

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sure i have seen that somewhere, but i have not got into replicating my own structs.

winged badger Mar 25, 2018, 1:23 PM

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replication replicates the NetIDs for the objects

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but in order to do that, the client must know how to construct the object on its own

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which is not possible for String messages that another user just typed in

burnt meteor Mar 25, 2018, 1:25 PM

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hey everyone why is ue4.19 build always failing?

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form link: https://answers.unrealengine.com/questions/772254/ue419-build-always-giving-errors.html

meager spade Mar 25, 2018, 1:25 PM

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Decode: what you mean always failing?

burnt meteor Mar 25, 2018, 1:26 PM

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see link @meager spade

twin juniper Mar 25, 2018, 1:26 PM

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Thanks for help, everyone!

winged badger Mar 25, 2018, 1:26 PM

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i think you might be building the engine