#multiplayer | Unreal Source | Page 560

bitter oriole Aug 10, 2020, 10:28 AM

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But to be fair, there are network limits that you can tweak

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It doesn't look like a pure performance issue right now

summer nova Aug 10, 2020, 10:28 AM

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yeah, 100 animated characters (pubg/fortnite) require a LOT of engine work

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thats not something you can get working well easily

potent cradle Aug 10, 2020, 10:29 AM

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I'd be very happy with 50-75

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It seems odd that at 50 characters, everything just stops working totally

summer nova Aug 10, 2020, 10:29 AM

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anything past 30-40 starts getting hairy

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just use actors

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those dinosaurs arent too complex to require a character movement component

potent cradle Aug 10, 2020, 10:29 AM

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The AI characters don't start moving around, my player controller doesn't get proper control of my own characters. Super odd.

summer nova Aug 10, 2020, 10:29 AM

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you might be super-lagging on the server

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moving 50 replicated and animated cmcs around is no joke, on my tests with shootergame characters something like that will use 20+ miliseconds

potent cradle Aug 10, 2020, 10:30 AM

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those dinosaurs arent too complex to require a character movement component
Could you provide some insight into when you would add a char movement component?

summer nova Aug 10, 2020, 10:30 AM

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when its an actual player

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thats what the cmc is designed for

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using it for npcs is super overkill

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the cmc does a lot of fancy prediction logic, network smoothing, and network rollback on mistakes and similar

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you just do not need that on npcs

potent cradle Aug 10, 2020, 10:31 AM

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I see

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Is it valid to remove the CMC during runtime?

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I'd rather not reparent

summer nova Aug 10, 2020, 10:31 AM

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no

potent cradle Aug 10, 2020, 10:32 AM

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(As players and AI can both control the same kinds of characters, would like to keep it uniform)

summer nova Aug 10, 2020, 10:32 AM

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oh

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uhm that makes it a lot harder

potent cradle Aug 10, 2020, 10:32 AM

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Yeah...

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I was thinking of swapping them out?

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Like

summer nova Aug 10, 2020, 10:32 AM

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you could indeed swap them out

potent cradle Aug 10, 2020, 10:32 AM

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Remove the CMC, or add it back on when needed

summer nova Aug 10, 2020, 10:32 AM

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but that is tricky

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no, that wouldnt work

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i mean swapping out the actor

potent cradle Aug 10, 2020, 10:33 AM

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No no, the CMC

summer nova Aug 10, 2020, 10:33 AM

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controlled dinosaur being a different thing than a wandering dinosaur

potent cradle Aug 10, 2020, 10:33 AM

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Hmm

summer nova Aug 10, 2020, 10:33 AM

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i dont think you can remove the cmc from a character class

potent cradle Aug 10, 2020, 10:34 AM

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I could swear I saw someone write about doing that

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But I could be very wrong

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I'll test it out

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At least this helps me understand the whole situation a bit better

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Appreciate the insight 😄

summer nova Aug 10, 2020, 10:34 AM

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there was some absolutely crazy shit i was experimenting with

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to try to achieve 200-300 players

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the idea was that you dont replicate the character

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you copy its parameters into a fake-character

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which is just a very simple actor

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so each player controls a full cmc-character, which is replicated, but only to the server, not to other players

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the server then copies its position/rotation into another actor, which is what other clients see

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because that proxy actor is so simple, its super fast, and lets you have a fuckton of them

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tho the server absolutely does chug with having to calculate so many cmcs, but there is trickery you can do to improve it, like disabling collisions and trusting the client

chrome bay Aug 10, 2020, 10:36 AM

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(can't remove the CMC btw)

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They're pretty tightly coupled together

potent cradle Aug 10, 2020, 10:36 AM

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Ah, fuck

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I'm SOL

chrome bay Aug 10, 2020, 10:37 AM

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Paragon didn't use CMC for it's minions for example

potent cradle Aug 10, 2020, 10:37 AM

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Seems like I'll have to have 2 different base classes

chrome bay Aug 10, 2020, 10:37 AM

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They just have some low-cost actor that tracks along the navmesh IIRC

summer nova Aug 10, 2020, 10:37 AM

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yeh, i can confirm that works

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i wrote a custom cmc for my vr game that did no collisions

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just slides on the navmesh

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navmesh raycast is very cheap

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on my testing you can do about a thousand of them per milisecond

potent cradle Aug 10, 2020, 10:38 AM

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Can't I disable the CMC at will instead?

summer nova Aug 10, 2020, 10:38 AM

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so yeah... fast

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@potent cradle yes, you can disable ticking on it or similar

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but stil...

potent cradle Aug 10, 2020, 10:39 AM

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Still bad?

chrome bay Aug 10, 2020, 10:39 AM

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still paying some of it's overhead even when it's disabled

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AI just talks to interfaces right? Shouldn't be dependent on something being a character

summer nova Aug 10, 2020, 10:40 AM

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ai talks into character

chrome bay Aug 10, 2020, 10:40 AM

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Being a pawn ofc, but not character specifically

summer nova Aug 10, 2020, 10:40 AM

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its kinda fucked

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on a newer project i had i basically just fully ignored the AI system

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and just made my own

chrome bay Aug 10, 2020, 10:40 AM

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I though it only dealt directly with lower-level stuff like UNavMovement etc.

summer nova Aug 10, 2020, 10:40 AM

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you can run behavior trees standalone

chrome bay Aug 10, 2020, 10:40 AM

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Yeah I'm not a fan of the engines AI system..

summer nova Aug 10, 2020, 10:40 AM

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they can basically just run by themselves

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so you can do it yourself

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one thing i had is that i just ran behavior tree on top of the simple Enemy actor

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and said Enemy actor had a bunch of components for different stuff such as melee combat logic

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i do something kinda like that but worse on my Hovergame project

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https://github.com/vblanco20-1/HoverGame

GitHub

vblanco20-1/HoverGame

Hovercraft game example in UE4. . Contribute to vblanco20-1/HoverGame development by creating an account on GitHub.

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in here i just have a Enemy interface, and i have multiple versions of it

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some enemies inherit from Actor, others from Character. But none of them actually have AI controllers, they just run the Ai logic on their actor itself

potent cradle Aug 10, 2020, 10:43 AM

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ai talks into character
AI as in what part specifically?

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But none of them actually have AI controllers, they just run the Ai logic on their actor itself
I can't even use AI controllers?

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Dear lord

summer nova Aug 10, 2020, 10:47 AM

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Ai controllers suck hard

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they force you into the character class

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which is something you absolutely do not want

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they are designed for player bots

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where you have some multiplayer bots and the likes that simulate a player

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for actual npcs its not a good idea to use it

potent cradle Aug 10, 2020, 10:50 AM

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I wish I knew that earlier

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But grateful for the info

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Looks like I'll have to reduce the scale for now and gradually polish up the codebase to the point where the logic is cleanly enough separated that I can switch over to lighter solutions with less issues.

chrome bay Aug 10, 2020, 10:51 AM

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I've found AI controllers themselves aren't neccesarily tied to the character class

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Just the default behaviours that come with the engine for behaviour trees are

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But tbh, for simple NPC's - do you even want/need that overhead of the full AI system etc.

summer nova Aug 10, 2020, 10:52 AM

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the behavior tree is pretty damn useful

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you can repurpose it for a lot of things

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tho it does create a ridiculous shitload of uobjects

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plus a lot of slow ticking

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you will know when you actually need it. A lot of very crappy enemy types work well with a very simple state machine

potent cradle Aug 10, 2020, 10:54 AM

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Is a real dedicated server better at handling all this than the PIE dedicated server?

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How well does the performance match up when compared between the two?

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I'd imagine so, considering the machine is doing less things at the same time without overhead, but on the other, locally bandwidth shouldn't be an issue which is a plus for performance while testing.

chrome bay Aug 10, 2020, 10:55 AM

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dedi server in PIE is 95% the same thing

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But yeah, information is transmitted instantly and with no real cap on bandwidth. You can simulate packet loss/latency with some in-engine settings (I just run Clumsy)

potent cradle Aug 10, 2020, 10:59 AM

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https://jagt.github.io/clumsy/

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This thingie?

chrome bay Aug 10, 2020, 11:01 AM

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yeah, I just use that instead of the in-engine settings. It works the same, I just find clumsy more convenient

potent cradle Aug 10, 2020, 11:14 AM

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@chrome bay Do you use a particular filter/config that I can note down?

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For clumsy

chrome bay Aug 10, 2020, 11:24 AM

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Nah, just wing it

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5-10% packet loss, 250-300 ping for a really nasty scenario

potent cradle Aug 10, 2020, 11:25 AM

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You just nuke your whole connection instead of specifically Unreal?

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I saw it had a filter option, but maybe it doesn't matter then

chrome bay Aug 10, 2020, 11:37 AM

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yeah, just remember to turn it off when you open up YouTube 😄

gusty raptor Aug 10, 2020, 1:01 PM

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Hi, is is possible/common to create widgets (hud) inside the player state?

bitter oriole Aug 10, 2020, 1:01 PM

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No

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Well it's probably possible but it doesn't make sense

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Player state is replicated

shut gyro Aug 10, 2020, 1:25 PM

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https://www.youtube.com/watch?v=oDSJ7vixpCE at 1:14:12 @thin stratus goes over getting the steam game name using the GetAppName(). I tried doing this on my own app ID but the Steam Game name is invalid, i.e. - NameLength returns -1 - does this only work if your product is verified or something?

YouTube

Unreal Engine

Steam Integration and Friends List Access | Community Led Training ...

Getting your game working with Steam is frequently an important part of one's development cycle. Cedric will begin with a walkthrough on how to integrate the Steam SDK, and once that's ready to go, he'll dive into exposing your friends list to UMG.

https://twitter.com/exifrex...

▶ Play video

thin stratus Aug 10, 2020, 1:27 PM

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Uh man, 3 years old already. Time sure flies

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Honestly, I'm not sure why it would return -1 for the name length. Did you see anything in the steam docs?

shut gyro Aug 10, 2020, 1:27 PM

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yea I know 😆 - the only thing I could find about getting the steam name though

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Yes - it says this above the function definitions

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//-----------------------------------------------------------------------------
// Purpose: This is a restricted interface that can only be used by previously approved apps,
//    contact your Steam Account Manager if you believe you need access to this API.
//    This interface lets you detect installed apps for the local Steam client, useful for debugging tools
//    to offer lists of apps to debug via Steam.
//-----------------------------------------------------------------------------
class ISteamAppList
{
public:
    virtual uint32 GetNumInstalledApps() = 0;
    virtual uint32 GetInstalledApps( AppId_t *pvecAppID, uint32 unMaxAppIDs ) = 0;

    virtual int  GetAppName( AppId_t nAppID, STEAM_OUT_STRING() char *pchName, int cchNameMax ) = 0; // returns -1 if no name was found
    virtual int  GetAppInstallDir( AppId_t nAppID, char *pchDirectory, int cchNameMax ) = 0; // returns -1 if no dir was found

    virtual int GetAppBuildId( AppId_t nAppID ) = 0; // return the buildid of this app, may change at any time based on backend updates to the game
};

thin stratus Aug 10, 2020, 1:29 PM

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Yeah I guess you have to do exactly that then

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Iirc I was using the 480 app id in that video

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Which probably has access to it

shut gyro Aug 10, 2020, 1:30 PM

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ah dang that's kind of annoying, but yea time to ask my product manager then lol

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I feel like it should be part of the friends API...

thin stratus Aug 10, 2020, 1:32 PM

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Yeah, but you are after all requesting the names of other games here too

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So I guess that is indeed more of an App API

gritty pelican Aug 10, 2020, 1:46 PM

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my pawn always spawning in Zero coordinates, why?

pallid token Aug 10, 2020, 1:52 PM

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If I drag my pawn into the editor, it's properties replicate, but if it is possessed by a controller, they do not replicate. What can be causing this?

winged badger Aug 10, 2020, 2:00 PM

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what makes you think they replicate when dragged into the editor?

pallid token Aug 10, 2020, 2:04 PM

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It's a ship that follows the motion of the ocean. The buoyancy is handled server-side, and the movement is replicated to the client.

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So, it seems it's only being replicated for Simulated actors.

gusty raptor Aug 10, 2020, 2:07 PM

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@bitter oriole thx yeah though so to, just wanted to be sure 🙂

winged badger Aug 10, 2020, 2:17 PM

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so clients see other clients fine?

pallid token Aug 10, 2020, 2:29 PM

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Actually, no. I was wrong.

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Only server-owned actors are getting replicated.

winged badger Aug 10, 2020, 2:38 PM

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so none of them are relevant to any connection?

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well, either your relevancy is very broken

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or your loaded from package boats can handle buoyancy locally and don't replicate at all

waxen socket Aug 10, 2020, 2:50 PM

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Good afternoon. I need to ask a couple questions about mixing local and online multiplayer from those who have accomplished this before. My game has only up to four players total. Any advice would be appreciated.

Firstly, if a gamepad must send input via a player controller actor even to spawn, does this mean I must spawn extra player controllers just in case they'll be used?

Cheers.

pallid token Aug 10, 2020, 2:56 PM

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@winged badger, I'm not sure what you mean by that second part.

winged badger Aug 10, 2020, 2:57 PM

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well you do have at least one bug

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it is conceivable that your boats know how to bounce on waves without server, as far as i know, at least

pallid token Aug 10, 2020, 3:09 PM

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Yes, I currently have it calculated on server because the other movements are more subtle and will take longer to debug the replication. I will be moving the undulation client-side once I've figured out what is wrong because any lag at all will look odd.

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But It is only being calculated on the server.

pallid token Aug 10, 2020, 3:27 PM

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Thanks @winged badger, I figured it out. I had some weird ifs that were catching the server rather than the clients, and I have no idea why dragging the pawn into place still worked, but I fixed it.

grim lintel Aug 10, 2020, 3:29 PM

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Hi all. Quick question if anybody encountered this already. When I'm trying to start the game with two players it crashes the editor (when two pawns get spawned) with PlayerInput::ProcessInputStack()

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I tried with one game pad and without, from the editor and started from the command line too

grizzled stirrup Aug 10, 2020, 4:04 PM

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Is there a reason a client calling GetMesh()->Deactivate(); wouldn't actually do anything and the mesh + anims keep playing, even though the same code freezes the mesh + anims on the server?

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Running into performance problems because even though the server and client call the same code, the mesh is never deactivated on clients while it is on the server

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Even spamming multicast RPCs to test with that code above doesn't deactivate the mesh on clients.... works fine when the server calls it

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To clarify this is an ACharacter so the mesh is a USkeletalMeshComponent

winged badger Aug 10, 2020, 4:32 PM

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you went and read the Deactivate function?

grizzled stirrup Aug 10, 2020, 4:33 PM

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@winged badger

    if (ShouldActivate()==false)
    {
        SetComponentTickEnabled(false);
        SetActiveFlag(false);

        OnComponentDeactivated.Broadcast(this);
    }

winged badger Aug 10, 2020, 4:34 PM

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pretty sure for characters

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its the CMC thats ticking the skeletons

grizzled stirrup Aug 10, 2020, 4:34 PM

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ah ok thanks testing that now at a fixed rate (didn't work on a one of on rep call)

winged badger Aug 10, 2020, 4:35 PM

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we had problems at one point with 2x animation speed on clients

grizzled stirrup Aug 10, 2020, 4:35 PM

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Still doesn't work 😦

winged badger Aug 10, 2020, 4:35 PM

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because CMC was ticking the skeleton

grizzled stirrup Aug 10, 2020, 4:35 PM

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Ah so it went twice

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Strange

winged badger Aug 10, 2020, 4:35 PM

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yeah, we assign our roles by hand

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and they were off at the time for autonomous

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and CMC is hardcoded steaming pile...

grizzled stirrup Aug 10, 2020, 4:36 PM

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I'm calling this multiple times a second via multicast RPC to test

    SetActorTickEnabled(false);
    GetMesh()->Deactivate();
    GetCharacterMovement()->Deactivate()

yet the enemy meshes are animating and notifies are firing etc....

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Only on the client

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Kind of eliminates the point of my pooling system

winged badger Aug 10, 2020, 4:36 PM

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TickBones boolean?

grizzled stirrup Aug 10, 2020, 4:37 PM

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Which bool is that?

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I don't see anything for bTickBones

winged badger Aug 10, 2020, 4:39 PM

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i can't recall where that was

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@meager spade

grizzled stirrup Aug 10, 2020, 4:39 PM

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Trying these

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    GetMesh()->SetComponentTickEnabled(false);
    GetMesh()->VisibilityBasedAnimTickOption = EVisibilityBasedAnimTickOption::OnlyTickPoseWhenRendered;

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Woo ok it looks like GetMesh()->SetComponentTickEnabled(false); works

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Still very strange that ->Deactivate() only worked on the server for no apparent reason, makes me wonder what else may be only being called there, potentially reducing performance on clients

winged badger Aug 10, 2020, 5:02 PM

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almost zero different

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you have more players to juggle

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for detection, decisions...

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other then that, no difference

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AIPawns do need to properly replicate though, but that doesn't fall under setting up AI as much as setting up Pawn

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and is no different then replicating a player pawn

meager spade Aug 10, 2020, 5:10 PM

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@grizzled stirrup i disable Skeletal Mesh tick

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when i optimize away the AI

grizzled stirrup Aug 10, 2020, 5:13 PM

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@meager spade What is strange though is that GetMesh()->Deactivate(); appears to do that already on the server (or at least SetTickEnabled(false); one of those)

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It's odd that SetComponentTickEnabled has to be manually called on the client

meager spade Aug 10, 2020, 5:14 PM

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yeah it has to

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it doesn't replicate

grizzled stirrup Aug 10, 2020, 5:14 PM

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Right but calling those same two lines on the client doesn't stop the ticking

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Only SetComponentTickEnabled does that

meager spade Aug 10, 2020, 5:14 PM

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maybe its gated?

grizzled stirrup Aug 10, 2020, 5:14 PM

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Even though it's not needed on the server

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YEah maybe

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Anyway good to know it must be called manually, thanks

meager spade Aug 10, 2020, 5:16 PM

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maybe clients just don't set the Active flag

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if (ShouldActivate()==false)

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is the gate here

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so maybe this returns true on client

grizzled stirrup Aug 10, 2020, 5:17 PM

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But IsActive surely would be true on the client if the bones are moving etc.

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Seems strange either way

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But yeah you are right they might just not set IsActive at all

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So ShouldActive never returns false

meager spade Aug 10, 2020, 5:20 PM

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only thing i can think off

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nothing else would cause that issue

twin sable Aug 10, 2020, 5:58 PM

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When I start my game with more than one player, the editor viewport seems to act as a client instead of the host

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like this code should spawn two managers, but you can see they dont show up in the editor (they spawn in single player)

📎 unknown.png

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(WorldGeneration and EnemyManager are missing)

📎 unknown.png

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These are my multiplayer settings. I'm wondering if this is intended or if I'm setting something up wrong

📎 unknown.png

grizzled stirrup Aug 10, 2020, 8:21 PM

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Is SetActorHiddenInGame() replicated?

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It seems to be but just double checking

lost inlet Aug 10, 2020, 8:25 PM

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@twin sable you can set the observed world under the outliner

twin sable Aug 10, 2020, 8:55 PM

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@lost inlet Thank you so much, never knew you could do this

meager spade Aug 10, 2020, 9:12 PM

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@grizzled stirrup its replicated BUT it doesn't have a OnRep

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so it doesn't actually hide on the clients

grizzled stirrup Aug 10, 2020, 9:24 PM

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Weird, it did seem to be hiding correctly on clients from a server only call

meager spade Aug 10, 2020, 9:27 PM

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maybe its done elsewhere

grizzled stirrup Aug 10, 2020, 9:27 PM

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Do you think it's because I am doing it directly after spawning on server

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No delay

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So it replicates down initially as hidden?

meager spade Aug 10, 2020, 9:27 PM

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ah

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hmm

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ah

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https://www.thegames.dev/snaps/rider64_lgUQy8EeDE.png

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its done on PostNetRecieve

grizzled stirrup Aug 10, 2020, 9:29 PM

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And that is called only on the initial replication?

meager spade Aug 10, 2020, 9:29 PM

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no

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    virtual void PostNetReceive() override;```

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PostNetInit is initial

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    virtual void PostNetInit();```

grizzled stirrup Aug 10, 2020, 9:29 PM

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Oh so in effect it would consistently hide on the client then?

meager spade Aug 10, 2020, 9:29 PM

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yh

grizzled stirrup Aug 10, 2020, 9:30 PM

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That's pretty sweet thanks

grizzled stirrup Aug 10, 2020, 9:45 PM

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Is if (GetLocalRole() != ROLE_Authority) the same as if (GetLocalRole() < ROLE_Authority) ?

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Since AFAIK nothing else is equal or greater to ROLE_Authority

meager spade Aug 10, 2020, 9:52 PM

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yes

slim matrix Aug 10, 2020, 10:08 PM

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is their a way i can simulate packet loss and lag

potent cradle Aug 10, 2020, 10:25 PM

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is their a way i can simulate packet loss and lag
@slim matrix

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https://jagt.github.io/clumsy/

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There's also in-engine console commands, but this was recommended to me here in chat today

unkempt tiger Aug 10, 2020, 10:42 PM

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so

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I've noticed that no matter how much I try to optimize my networking, the result is ALWAYS shitty as soon as I have around 5 or 10 of whatever actors I'm working on

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I'm testing this in the editor using network emulation (on both client and server) at 'Average' case

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And this is really confusing because when I look at other games, they can run 30+ actors together with seemingly no bugs, and near perfect synchronization at super low latencies

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is the in-editor network emulation somehow worse than real servers as far as networking is concerned?

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What am I missing?

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I've tested different net priority values, I tried on-tick RPCs, I tried normal property replication, I tried lowering rates, increasing rates, I tried compressing values during serialization as much as the engine allows

harsh lintel Aug 11, 2020, 1:10 AM

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is it wrong to spawn an actor on the player state? im spawning an possessing but the pawn is floating mid air without falling to the ground and it doesn't even receive input

bitter oriole Aug 11, 2020, 6:05 AM

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@unkempt tiger The answer is probably that other games have has a lot of work on them by dozens of network experts. Networking is really hard. Explain your issues and you can get help

unkempt tiger Aug 11, 2020, 8:02 AM

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Yes, it is hard! However I know the theory and have some experience myself, and I did the math, I could barely squeeze enough bits per second as other games must have. Even if those other games used deterministic locking and somehow only sent super-compressed input-only packets it still didn't add up

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I did notice that running my tests with a UE4 instance per client (rather than running all clients under the same instance) resulted in much better results, and it finally matched my expectations

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But that does make me wonder, is there anything else of similar nature I can do during my tests to better simulate the real world case from within my editor?

bitter oriole Aug 11, 2020, 8:07 AM

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The editor isn't really the place to test networking in general, it doesn't support sessions, and it's quite different from regular gampelay

winged badger Aug 11, 2020, 8:19 AM

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its not a place to do stress tests in, but "casual" gameplay shouldn't have much problems

grave notch Aug 11, 2020, 9:05 AM

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I made simple host server, browse servers and join them with Advanced Session Plugin. It works through LAN, and on my local pc it works fine, but when i try to use it through Hamachi, to emulate LAN with other ppl, game doesn't see any hosted servers.

misty flower Aug 11, 2020, 9:34 AM

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how to replacated montage with rootmotion ?

gusty raptor Aug 11, 2020, 10:14 AM

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Hi, for my game i have a background map in the lobby. Any idea about how to make that map static (so it wont be replicated)?

bitter oriole Aug 11, 2020, 10:45 AM

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Maps are never replicated

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Objects put in it might be

gusty raptor Aug 11, 2020, 11:02 AM

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i know, my question a bit weird, but was hoping i missed maybe some smart way to make it like i need 😛

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seems ill have to code it for like everything

bitter oriole Aug 11, 2020, 11:02 AM

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I don't understand what you are asking

gusty raptor Aug 11, 2020, 11:03 AM

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basically in the lobby i use the same map and savegame for the citybuilder style game

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however as its just a visual thing, not playable i dont wanna replicate the game in the lobby

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ingame it does need to be replicated, but its the same map to

bitter oriole Aug 11, 2020, 11:04 AM

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Well, don't spawn replicated actors before the game starts

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Though honestly, I don't see big issues with having the networking while in the lobby

gusty raptor Aug 11, 2020, 11:05 AM

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yeah, i thought about it to., if it wont hurt it might be okay

fringe dove Aug 11, 2020, 12:36 PM

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Is it documented anywhere exactly what happens with server rpcs called on the server?

Say I have a client rpc Foo that calls a server RPC Bar, and the client is the server (listen server):

ClientFoo_Implementation() { ServerBar(); }

Which happens?

ServerBar_Validate and _Implementation get called immediately
ServerBar_Validate and _Implementation are queued, and then called immediately after ClientFoo_Implementation returns prior to any other RPC being handled
ServerBar_Validate and _Implementation are queued behind every other RPC and then called only after other RPCs are processed, but on same net driver tick and before the rest of game is ticked
ServerBar_Validate and _Implementation is queued and then called only after net driver is ticked again on next engine tick

meager spade Aug 11, 2020, 12:44 PM

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RPCs that don't need to be routed are executed as a normal function

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so a client RPC on a server, which does a Server RPC, will just be normal function calls and skip the RPC stuff.

fringe dove Aug 11, 2020, 12:45 PM

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hmm that's the assumption I had been making, just wasn't seeing it happen when I added a breakpoint

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I'll have to see what's going on

meager spade Aug 11, 2020, 12:46 PM

#

i mean that is what i am lead to believe, they just execute like regular functions if RPC is not needed

fringe dove Aug 11, 2020, 12:47 PM

#

ahh, I had play as client turned on, so it was running as if dedicated server

#

ok yeah I'm seeing it called immediately when I put it back to listen server mode.. whew

#

that was going to break a lot of assumptions

gusty slate Aug 11, 2020, 1:27 PM

#

Hello everyone :)
If I have a consumable which gets placed in the map, not spawned. And I want it to get destroyed for all players when one of them overlaps (consumes) it. Does it have to be set to replicate? And treat it that way?

#

Or is there a way to destroy the actor in a different way

fallen oracle Aug 11, 2020, 1:36 PM

#

@gusty slate You could technically delete it with an RPC, but it is advisable that you replicate the actor itself, and delete when needed. If you dont have any other variables you need replicated, you can tune down the NetUpdateFrequency.

gusty slate Aug 11, 2020, 1:38 PM

#

Hmm, setting them to replicate and calling a server RPC gives me the error that no there is no owning connection for the volume 🤔

gleaming niche Aug 11, 2020, 1:39 PM

#

you cannot issue commands to the server from anythinmg other than player controller, or a player controller posessed pawn

winged badger Aug 11, 2020, 1:39 PM

#

or anything owned by either of those

gleaming niche Aug 11, 2020, 1:39 PM

#

yeah, the owner chain must be owned by a playercontroller.

fallen oracle Aug 11, 2020, 1:39 PM

#

you probably should handle the overlap, and pickup event on the server, and do a multicast RPC to clients when someone picked up

gusty slate Aug 11, 2020, 1:40 PM

#

I see what you mean

#

Alright, thank you

uncut schooner Aug 11, 2020, 2:00 PM

#

Hello

#

I have a problem, when I try to replicate a socket (With IK/Aim offset) when I set Owner no see the socket doesnt get replicated to owner and stays floating, the major problem is that I cant query the location of the socket

#

Please can someone help me

#

📎 ScreenRecorderProject24.mp4

#

When I try get the value it stays static to the owner who cant see their animation anymore

waxen socket Aug 11, 2020, 2:43 PM

#

Good morning. I'm looking for a way to detect gamepads connecting and disconnecting in Blueprint. Any advice would be appreciated.

Cheers.

winged badger Aug 11, 2020, 3:09 PM

#

handline any key pressed and checking if its a gamepad key, possibly

waxen socket Aug 11, 2020, 3:12 PM

#

I see. It seems to me that I have to spawn extra player controllers just in case there's a gamepad connected.

hoary lark Aug 11, 2020, 3:33 PM

#

if you connect one with the editor running I think I remember it prints a debug message in the output log? maybe search engine source for that message, maybe you will find an event if your google-fu (or discord search-fu) isn't finding any results

errant vapor Aug 11, 2020, 3:38 PM

#

any reason why my FFastArraySerializer wouldnt have its NetDeltaSerialize called on it? despite replicating nicely

waxen socket Aug 11, 2020, 3:39 PM

#

Thanks, HoJo, I'll look into that.

rose egret Aug 11, 2020, 4:06 PM

#

how do I know character fell from a specified height ? I want to apply damage based on that 🤔

faint dock Aug 11, 2020, 4:16 PM

#

use the velocity for fall dmg

dark edge Aug 11, 2020, 5:42 PM

#

@rose egret map fall z velocity to dmg

unkempt tiger Aug 11, 2020, 6:59 PM

#

is there a way to make an actor replicate only to its net owner?

#

I suppose I can override IsNetRelevant with a net owner check?

#

But I'm hoping there's a better way :)

meager spade Aug 11, 2020, 7:03 PM

#

Relevant Owner only?

unkempt tiger Aug 11, 2020, 7:04 PM

#

Yes

meager spade Aug 11, 2020, 7:04 PM

#

    UPROPERTY(Category=Replication, EditDefaultsOnly, BlueprintReadOnly)
    uint8 bOnlyRelevantToOwner:1;```

#

🤷L

unkempt tiger Aug 11, 2020, 7:04 PM

#

Ah yes, excellent

#

Thanks!

cedar finch Aug 11, 2020, 7:15 PM

#

When using line trace weapons, what is the most optimized way to display bullet tracer effects? Basically faking it to make it look like a bullet flying through the air, even though it doesn't really do anything. Should I spawn a projectile that does nothing but get destroyed when it collides? If so should I spawn it on server and make it replicate movement? I'm just trying to figure out what is the best for bandwidth.

unkempt tiger Aug 11, 2020, 7:21 PM

#

@cedar finch just send a start position, and a direction vector, then on the client use those to display an instantaneous trace effect (you can also add hit position / bullet type / whatever else you might need)

#

that is if the bullet is fast

#

if its a slow projectile that has a lasting presence in the game you should use a different solution

cedar finch Aug 11, 2020, 7:26 PM

#

The weapons are hit scan weapons that are using linetraces so they instantly damage whatever you're aiming at. Such as full auto M-16's etc. I was just trying to make a fake "tracer" that would visually look like a bullet but not really do anything. That way it looks cool. So I have the start location, direction, and hit location before I even spawn a projectile. The projectile is just for looks. I just was wondering what the most optimized way to spawn it and make it move was without hurting performance

unkempt tiger Aug 11, 2020, 7:27 PM

#

the projectile itself should not be replicated

#

just the effect trigger itself

cedar finch Aug 11, 2020, 7:28 PM

#

what do yo mean by effect trigger?

unkempt tiger Aug 11, 2020, 7:28 PM

#

whatever code spawns the effect

cedar finch Aug 11, 2020, 7:31 PM

#

Ahh I see. Sorry about that. That makes sense. I could just spawn the projectile in the same event I spawn the muzzle flash.

#

Thanks. 🙂

meager spade Aug 11, 2020, 7:38 PM

#

dont spawn them too often tho

#

a lot of games do like a smoke trail, but spawn a tracer every 2-3 shots

#

on fast firing guns

cedar finch Aug 11, 2020, 7:41 PM

#

That makes sense. Is there no other way to fake it that wouldn't impact performance? I only ask because people always tell me "hit scan weapons don't look as cool a projectile weapons" so I was trying to fake a way to make them look cool.

meager spade Aug 11, 2020, 7:42 PM

#

most fast firing guns in games are hitscan, for example in games like Fortnite, and Call of Duty

#

projectiles guns are like rocket launchers, they just spawn tracer effects

#

to make it look like you are firing a bullet

#

now to make them not cost a lot

#

you pool them. In my game i have a ClientOnlyFXActor

#

this holds pooled weapon FX, impact effects, etc

#

then its simply a matter of moving them to where i want, activating them and voila

#

Player fires weapon, gameplay cue for shot is generated, sent to all clients, clients grab there local fx actor, and set the fx to the supplied cue information (which holds the HitInfo)

#

thing is, you still have to tell clients every shot happened, i generate around 7-8 gameplay cues for a single shot, and they are each a multicast, but i actually do something clever, i intercept them, and send them as an optimized single cue 😄

#

(getting off topic a bit), but just explaining my weapon system

cedar finch Aug 11, 2020, 7:50 PM

#

I believe you were the person who told me to do that with my weapon system. I combined my bullet hit info into one struct and it boosted my performance a ton. It saved me from doing a lot of multicasts by putting it all in one. I know yours is more complex than mine lol but I remember you helping me. 🙂 But to get back on topic lol, you said you can spawn tracer effects, Those are just particle effects I assume. I could just spawn them at the same time I spawn the muzzle flash couldn't I and it would look like bullets but really it's just an effect

meager spade Aug 11, 2020, 8:09 PM

#

yeah just particle effects

#

well muzzle flash doesn't know the direction

#

so it would have to be done once you have the actual shot info

cedar finch Aug 11, 2020, 8:12 PM

#

Yea I just realized that lol It's playing in the wrong direction

sterile shale Aug 11, 2020, 8:28 PM

#

Aye anyone have a good tut on multiplayer through epic , not steam?

cedar finch Aug 11, 2020, 8:31 PM

#

I haven't seen any yet. I figured it was still new and people were still learning it all.

#

Hmmm So I can't for the life of me make this trail effect rotate towards where I'm shooting. It looks like it's always headed towards (0, 0, 0) I have the start location and hit location but it won't rotate. https://i.gyazo.com/7d02b99884bd274d3e64064a407079a1.gif

#

https://i.gyazo.com/efb37d6d1f888ae4762f2ad2a5681440.png

meager spade Aug 11, 2020, 9:06 PM

#

@cedar finch where did you get that trail from

cedar finch Aug 11, 2020, 9:06 PM

#

@meager spade It's from the Shooter game example

#

It's called "P_AssaultRifle_Trail"

gleaming niche Aug 11, 2020, 9:21 PM

#

you need to set the end point

#

which for that particle is "beamend" IIRC

#

it doesn't use rotation. it uses a particle vector paramater.

#

it might be "shockbeamend" for that matter, i forget.

#

opening one of my test projects to check.

#

📎 unknown.png

#

shockbeamend

meager spade Aug 11, 2020, 9:24 PM

#

@cedar finch you need to set the end point

gleaming niche Aug 11, 2020, 9:24 PM

#

            if (Particle)
            {
                auto Scale = FMath::RandRange(Hitscan_TrailScale.X, Hitscan_TrailScale.Y);
                Particle->SetWorldScale3D(FVector(Scale, Scale, Scale));
                Particle->SetVectorParameter(Hitscan_TrailTargetParam, EndPoint);
            }```

meager spade Aug 11, 2020, 9:25 PM

#

^

gleaming niche Aug 11, 2020, 9:26 PM

#

i really need to finish my plugin and release it.

#

would be so useful for so many people.

#

📎 GXP_Overview.txt

#

(i separated the vehicle stuff into a sub-plugin though)

#

i also have some engine changes i need to attempt to make a PR for, that implements al lthe missing physx stuff, that engines like Unity have.

#

(begin/end collision(touch), etc)

#

and actual friction events

#

so you can do like scraping. like when a sword slides along a surface, it scratches with proper friction.

#

zz nite.

cedar finch Aug 11, 2020, 10:07 PM

#

Thank you guys! Works perfect now! 🙂

high lotus Aug 12, 2020, 1:42 AM

#

not sure if this is the correct channel, but I'm trying to make an achievement in steam based on lifetime account # of kills - has anybody done this with blueprints?

gleaming vector Aug 12, 2020, 2:13 AM

#

I built something similar to your inventory system @gleaming niche

#

i'm a bit swamped with client work, but eventually I'm going to put it on the marketpalce

#

maybe we can share notes

#

also, i do not recommend expanding the physx vehicle system, chaos vehicles are in 4.26

#

at this point it's probably best to just wait

#

because the underlying chaos vehicle sim is extendable

rain sandal Aug 12, 2020, 2:39 AM

#

excited for 4.26 chaos updates 😉

gleaming niche Aug 12, 2020, 2:42 AM

#

well i already did that in summer of 2018

#

lol

#

the vehicle stuff that is.

vital steeple Aug 12, 2020, 4:48 AM

#

are the chaos vehicles supposed to replicate and have network interp?

#

i know chaos has some replication goals for it in the roadmap

#

also the roadmap is confusing. it sounds like chaos will be done in 4.26 but ive also heard its one of the things theyre going to release in ue5

winged badger Aug 12, 2020, 4:54 AM

#

its unlikely chaos will be done for another year at least

queen flower Aug 12, 2020, 6:35 AM

#

Anyone have the a link to a video or a breakdown explaining the multiplayer changes that came with 4.25? I had it working between 2 different IP addresses and now it's broken. Can't get the setting right. Used to only use dedicated server checkbox, but that is gone now.

#

Local split screen works. Client one hosts, client 2 sees the game and can join it. just don't know what I need so me and a friend can play the same game together. What settings do I need for him to see my hosted game?

random verge Aug 12, 2020, 7:03 AM

#

When an object has a replicated array of structs, does the entire array replicate each time a value of one of its elements is updated or is just the updated element(s) replicated?

bitter oriole Aug 12, 2020, 7:06 AM

#

Only updated elements

random verge Aug 12, 2020, 7:06 AM

#

oh thats awesome. thank you 🙂

bitter oriole Aug 12, 2020, 7:09 AM

#

Structs themselves also replicate per-element IIRC

#

Or at least partially

random verge Aug 12, 2020, 7:10 AM

#

ah that's even better if so

versed bear Aug 12, 2020, 8:25 AM

#

On a listen server, anyone know why in GameMode::PostLogin() my PlayerController->GetPawn() is null for the host but not for the client?

winged badger Aug 12, 2020, 8:36 AM

#

on any server, unless you delay beginplay or custom spawn the controller deferred

#

well, for PostLogin even that doesn't matter

#

you can't have a Pawn at PostLogin, unless you overrode half the GameMode

#

client or server

#

after PostLogin, few native functions are called, then HandleStartingNewPlayer, which spawns default pawns by default

#

PostLogin also doesn't happen on clients, its a function on GameMode

versed bear Aug 12, 2020, 8:40 AM

#

I know PostLogin doesn't happen on clients, but when a client logs in GetPawn works inside PostLogin, but when it's the host logging in GetPawn() is null

winged badger Aug 12, 2020, 8:40 AM

#

on servers, PCs get instantiated, then call BeginPlay, then Posses a Pawn, so they don't have a Pawn on BeginPlay

#

on clients, the replicated Pawn reference gets set and OnRep called before BeginPlay, so they do

versed bear Aug 12, 2020, 8:41 AM

#

ok, so I guess PostLogin isn't the best place for what I'm trying to do. I'll try moving my logic somewhere else, thanks

winged badger Aug 12, 2020, 8:43 AM

#

HandleStartingNewPlayer is where GM by default calls RestartPlayer, which spawns the DefaultPawn

#

its also the best place to override any logic that has to do with start of the game and Pawns

#

if you don't call Parent/Super then you have to spawn the PlayerPawn manually

versed bear Aug 12, 2020, 8:44 AM

#

oh nice, thanks for the suggestion, I'll look into it

winged badger Aug 12, 2020, 8:44 AM

#

its also called from both PostLotin and HandleSeamlessTravelPlayer

#

so it works in both scenarios

gritty pelican Aug 12, 2020, 10:09 AM

#

if the pawn is controlled by a player, then the owner will be the player. And if the pawn is not controlled by the player, will the owner be the server?

winged badger Aug 12, 2020, 10:40 AM

#

the owner will be null, unless its explicitly set

gritty pelican Aug 12, 2020, 10:47 AM

#

@winged badger why then for an uncontrolled pawn the function "IsLocallyControlled" returns the true?

#

on server side

chrome bay Aug 12, 2020, 10:48 AM

#

It doesn't unless it has a controller

#

It probably has an AI controller if it's true and a player isn't controlling it.

winged badger Aug 12, 2020, 10:51 AM

#

bool USolsticeObjectLibrary::IsLocallyControlled(AActor* ActorToQuery)
{
    if (!ActorToQuery)
    {
        return false;
    }

    AActor* TopOwner;

    for (TopOwner = ActorToQuery; TopOwner->GetOwner(); TopOwner = TopOwner->GetOwner())
    {
        
    }

    APlayerController* Controller = Cast<APlayerController>(TopOwner);
    return Controller && Controller->IsLocalPlayerController();
}

#

my answer to IsLocallyControlled question

#

static function, can just shove any Actor, or GetOwner() of any ActorComponent into it

gleaming niche Aug 12, 2020, 1:41 PM

#

Anyone have the a link to a video or a breakdown explaining the multiplayer changes that came with 4.25? I had it working between 2 different IP addresses and now it's broken. Can't get the setting right. Used to only use dedicated server checkbox, but that is gone now.
@queen flower i had to revert one of the changes for me with my engine build, because it would never pass the URL options in editor.

#

well, without actually running standalone or whatever, i forget now. it caused great agony.

#

anotehr stupid change.

#

that was clearly not tested properly.

wicked brook Aug 12, 2020, 1:55 PM

#

@shut loom yes

thin stratus Aug 12, 2020, 2:08 PM

#

@wicked brook Was a fleet just the servers with a specific build?

#

Iirc a DedicatedServer on GameLift gets an Init Call or so, in which it can prepare before allowing users to play.
If that Call contains info about the GameMode, you could start the map with the given GameMode (dynamically) and thus stick with one "fleet".
But it's been a while since I used GameLift.

#

I know that I couldn't do that with PlayFab, because PlayFab had no info when it got the allocate call, something like that at least.

wicked brook Aug 12, 2020, 2:12 PM

#

well you really only need separate fleets if the game modes are for different maps.

#

if the map is the same then one fleet should be fine

#

in mine we have different maps so we had to use a fleet for each map

#

I have not tried it like that though

thin stratus Aug 12, 2020, 2:28 PM

#

But why

#

Like, you can always do open <MapName>?game=<gamemode>

#

As long as your map supports the GameMode, that should work just fine.

prisma vortex Aug 12, 2020, 3:39 PM

#

any ideas on how to make nameable multiplayer servers? I have code to make a server but want people to be able to name it, similar to how wolfquest is as well as password protect it 👉 👈 After having named it I want to make a list of servers so people can join them if they know the password 😬

regal storm Aug 12, 2020, 6:43 PM

#

Am I correct in thinking that variables controlling animation / movement should be replicated inside the character blueprint, but NOT inside the animation blueprint? I've got movement speed changes happening over the network, but for whatever reason those same variables driving the animation don't seem to work 😦

#

Except for Jump, that works fine, but the client has a lot of jitter when jumping (when viewed from the server's perspective)

kindred widget Aug 12, 2020, 7:00 PM

#

@regal storm Animation should not be replicated. Animation should have absolutely NOTHING to do with the server. Each machine should handle any animation for the actors on it, even if they are replicated to the machine. The animation blueprint should be able to get variables without any network use. Your actors themselves should be doing the network stuff and the Animblueprint should just be getting variables and setting animations based on those variables.

#

In theory, this ends up with all players seeing exactly the same thing, since all clients get all the variables the same way which leads to the animblueprint doing nearly the exact same thing.

regal storm Aug 12, 2020, 7:03 PM

#

Thank you! Yeah so right now the client can see the server perform everything, and everyone can see themselves perform everything, but clients can't see other clients animations. Must be missing something somewhere (note to self: Replicate from day 1, not after a system is built)

#

All of the variables used to trigger/impact animations are replicated in the Character BP, and the Anim BP pulls those and sets them locally to a separate duplicate set of variables for easier access throughout the Anim BP.

#

I guess I need to filter through everything I've done and check if there is one variable holding this all up

kindred widget Aug 12, 2020, 7:06 PM

#

Typically most of this should be state based replication as far as I understand. So your clients should be Server RPCing to your server, setting that variable on the server version of that actor, and then that server version would replicated it back to everyone.

#

Crouch for example. One single RPC with a boolean input. Button pressed send rpc with true, button released, send RPC with false. Server gets RPC, sets that variable locally(on the server). Server replication happens, sends that variable back to all clients. Anim blueprint pulls the variable from the character and changes it's state based on that.

regal storm Aug 12, 2020, 7:09 PM

#

From my understanding the Crouch / Uncrouch approach is already replicated in CharacterMovement?

kindred widget Aug 12, 2020, 7:10 PM

#

Can be. It's just an example.

regal storm Aug 12, 2020, 7:12 PM

#

Ahh, okay 🙂

I can't see anything totally wrong here, but perhaps there is

📎 unknown.png

#

(Ignore the Branch issue in Crouch/Uncrouch)

kindred widget Aug 12, 2020, 7:14 PM

#

What style of game is this?

#

First person, or?

regal storm Aug 12, 2020, 7:15 PM

#

First and Third 🙂

#

(Third has a rotating orbit camera when Alt is held)

kindred widget Aug 12, 2020, 7:16 PM

#

The movement controls are a bit confusing. How come the server and clients aren't being called the same way?

regal storm Aug 12, 2020, 7:18 PM

#

Ahh, hmm - I'm not sure what you mean? The client runs the event on the server when setting the variables, is that not correct?

kindred widget Aug 12, 2020, 7:19 PM

#

Pretty much all of that should just be the local machine calling Add Movement Input. It's replicated automatically in character. So All clients will see all clients move.

regal storm Aug 12, 2020, 7:20 PM

#

Ahh, yeah so the client does call the Add Movement Input, but the InputX/InputZ and Direction are being used in the Animation Blueprint, so my thought was they needed to be set by the server?

#

I guess the server runs it as well with my current setup, but I could change that so only the client runs Add Movement Input

kindred widget Aug 12, 2020, 7:22 PM

#

You can get that kind of stuff in other ways besides extra rpcs. For example, most movement can be based on control rotation, or character facing mixed with character velocity.

regal storm Aug 12, 2020, 7:23 PM

#

Ahh, so I should get that information in the Animation BP through other ways? Instead of keeping the replicated variable?

#

Would that not arrive at the same result either way?

#

Ahh, hmm a quick test just getting velocity did fix the issue. Means I'll have to rethink how I calculate a few things but that helps. Thank you!

kindred widget Aug 12, 2020, 7:27 PM

#

It would, just that pretty much all information that you need for that stuff is already replicated and available.

tranquil thunder Aug 12, 2020, 8:04 PM

#

Using steams 480 app Id, how many players can you connect? I've been seeing 4, but we cant get past 2 for whatever reason

queen flower Aug 12, 2020, 8:48 PM

#

Anyone know what play or multiplayer settings I need to have so a client can see my hosted game? LAN works, but non-LAN clients fail to see my hosted game.

#

I've tried variations of Open Level with Listen option, and Run as Client, and Run as Listen Server. No luck.

bitter oriole Aug 12, 2020, 8:53 PM

#

Which online subsystem are you using ?

queen flower Aug 12, 2020, 9:14 PM

#

Not sure what a subsystem is, but I've enabled advanced sessions plugin. I have the steam plug in but its disabled

bitter oriole Aug 12, 2020, 9:27 PM

#

@queen flower You need a real (like, Steam) OSS to have online matchmaking.

#

Platforms don't perform the service for free

#

Steam and EGS are the only two doing it for "free" on PC AFAIK

#

Though EGS doesn't have a nice official plugin yet

#

GOG does, but you need your game on GOG first

queen flower Aug 12, 2020, 9:53 PM

#

ok @bitter oriole so i should enable steam and try again? with what settings on the hosts end? what settings on the clients end?

#

and just for clarity, is standalone required for this to work?

queen flower Aug 12, 2020, 11:11 PM

#

📎 unknown.png

bitter oriole Aug 12, 2020, 11:17 PM

#

Yes standalone is required

#

OSS don't work in PIE

queen flower Aug 12, 2020, 11:18 PM

#

I got the defaultengine.ini text added, and the steam popup in the bottom right is not appearing in standalone

#

ive enabled the plugin

#

I am logged into steam

#

I have restarted the project.

#

I followed this guys video:
https://youtu.be/XlqHG1egnn0

YouTube

Strigifo

UE4 / Unreal Engine 4 Multiplayer - #06 Steam & Advanced Sessions

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

This Video:
In this video, we get the project ready for all of our networked gameplay by adding the Steam Subsystem ...

▶ Play video

#

Basically tells me where to put the steam default engine text and where to get the advanced sessions plugin

#

The video shows it working

lament cloak Aug 12, 2020, 11:36 PM

#

So I understand SteamNetDriver blocks direct IP connections. Is there a way to allow it to do both direct IP and Steam ID connections?

Use case is, we have dedicated servers that will start up from our fleet, we don't need to register them to a master server, because clients will be told which server to connect to. We could use IPNetDriver and that fixes that problem. But we also use Listen servers, having the NAT traversal built in with the SteamNetDriver makes things really nice for people wanting to host Listen servers.

frozen brook Aug 12, 2020, 11:38 PM

#

Hello guys

#

Pls how do I go about fixing jittering of client

#

On the clients screen, the player jitters but on the server it does not

meager spade Aug 13, 2020, 1:15 AM

#

make sure Skeletal mesh is not set to replicated @frozen brook, ensure max walk speed is the same on client and server

short burrow Aug 13, 2020, 3:01 AM

#

I got through following this on youtube {Blueprint Multiplayer: | v4.11 Tutorial Series | Unreal Engine} but have two problems 1: able to join more them max players if joining several at close timing. 2: My Game settings no longer functions when it use to. Any ideas on ether problem?

short burrow Aug 13, 2020, 3:41 AM

#

Solved problem # 2 my player save was Not getting set.

kindred widget Aug 13, 2020, 5:27 AM

#

@frozen brook If you mean the client's own player character jitters on their own screen, but their character doesn't jitter on the server's screen, it's usually an issue with the client trying to move their character too much. In short, the client thinks it's slower or faster than the server thinks it is, or the client is making extra move calls on it's own character and the server is resetting it.

frozen brook Aug 13, 2020, 7:50 AM

#

@kindred widget yh

#

@meager spade I'll try this

timid moss Aug 13, 2020, 9:52 AM

#

Does anyone know if theres some callback telling the server that the current actor just got replicated to the client?

karmic briar Aug 13, 2020, 10:00 AM

#

hey guys i have some questions.whats stuff should be add in the replication graph?what stuff that required to add?any examples?

chrome bay Aug 13, 2020, 10:01 AM

#

ShooterGame has a full example of using rep graph

karmic briar Aug 13, 2020, 10:02 AM

#

yeah i read the code of shootergame and i thought only the players and the projectiles they added..my quetsion like what's the general thing that should be add into the graph?i know this is different between games but im really clueless

#

what do you ususally add in repgraph for your game jambax?

#

🤔

chrome bay Aug 13, 2020, 10:03 AM

#

tbh it's a pretty long topic, I followed a similar pattern to shootergame. It's not too difficult to make sense of once you've followed it through.

karmic briar Aug 13, 2020, 10:03 AM

#

sorry if this a noob question im new to repgraph coding

#

any like example you can give

#

😅

chrome bay Aug 13, 2020, 10:04 AM

#

Can't get more of an example than a working version 😄

karmic briar Aug 13, 2020, 10:04 AM

#

hmmm can i know like my project is an rpg maybe examples you can think of on that ?

#

🤔

#

like what i can think of is things liek the players,world chest(like the one in fortnite),arrows projectile

#

pretty much actor that need to be network optimize

chrome bay Aug 13, 2020, 10:06 AM

#

Well ShooterGame has all those things near enough, you just need to decide how each class should replicate and who too

#

Generally speaking InitGlobalActorClassSettings() is where you sort classes into a special TMap, that map links classes to an enum which determines it's "replication policy"

karmic briar Aug 13, 2020, 10:07 AM

#

🤔

chrome bay Aug 13, 2020, 10:07 AM

#

Then you override RouteAddNetworkActorToNodes(), figure out what replication policy the actor uses (based on it's class), and add it to the appropriate node(s)

karmic briar Aug 13, 2020, 10:08 AM

#

is InitGlobalActorClassSettings() in the original repgraph.h file?

#

wanna see that code comment

#

i think i didnt use that fucntion

chrome bay Aug 13, 2020, 10:08 AM

#

    virtual void InitGlobalActorClassSettings();```

#

How you setup that data is up to you though, the base rep graph is pretty barebones by design

karmic briar Aug 13, 2020, 10:09 AM

#

ouh...okay yeah i definitely need to override that

#

😅

#

that fucntion is getting called before the actor get route to this right RouteAddNetworkActorToNodes(),

chrome bay Aug 13, 2020, 10:10 AM

#

It get's called once when the rep graph is initialized

frozen brook Aug 13, 2020, 10:10 AM

#

@meager spade it's working now...thanks man

karmic briar Aug 13, 2020, 10:10 AM

#

ahhh okay

meager spade Aug 13, 2020, 10:10 AM

#

what was the issue @frozen brook ?

karmic briar Aug 13, 2020, 10:10 AM

#

imma redo the code a bit..thanks and imma re read the shootergame repgraph again

frozen brook Aug 13, 2020, 10:11 AM

#

Jittering of client

meager spade Aug 13, 2020, 10:11 AM

#

yes but what fixed it?

chrome bay Aug 13, 2020, 10:11 AM

#

Yeah, go through it step-by-step. It's actually pretty simple once you get the idea

#

You lose per-actor relevancy etc. settings but it's worth it if you have huge actor counts or lots of connections

frozen brook Aug 13, 2020, 10:11 AM

#

You said I should not replicate the mesh @meager spade

chrome bay Aug 13, 2020, 10:11 AM

#

If you only have like a few players and a "normal" amount of actors, it's probably not worth it.

meager spade Aug 13, 2020, 10:12 AM

#

yeah people click Replicate on the mesh cause they think they have too, but it breaks things

karmic briar Aug 13, 2020, 10:12 AM

#

yeah my game is kinda depends on high player count thats why i need the repgraph to be optimize..

chrome bay Aug 13, 2020, 10:12 AM

#

Bear in mind all rep graph does is (potentially) reduce server CPU overhead. Doesn't save any bandwidth or anything.

frozen brook Aug 13, 2020, 10:12 AM

#

@meager spade at first I taught it was because I have a lot of things running through the server

#

Pls does anyone know anything about auto join team in team death match?

gusty raptor Aug 13, 2020, 12:55 PM

#

Question about seamless travel: When i join a session (to lobby) the map reloads, as its the first time. anyone knows how to not reload the map?

twin juniper Aug 13, 2020, 2:25 PM

#

When you have steam dedicated server up and running how how do you change the name of it?

chrome bay Aug 13, 2020, 2:30 PM

#

Just update the Host Settings you created it with

#

E.g.

#

HostSettings->Set(SETTING_DCID, m_serverName, EOnlineDataAdvertisementType::ViaOnlineService);

#

Then you want to get the active session, and call "UpdateSession" on it with those new settings

twin juniper Aug 13, 2020, 2:33 PM

#

Ok thank you

chrome bay Aug 13, 2020, 2:34 PM

#

Something like this:

    if( OnlineSub )
    {
        IOnlineSessionPtr Sessions = OnlineSub->GetSessionInterface();
        if( Sessions.IsValid() )
        {
            if( HostSettings.IsValid() )
            {
                if( FNamedOnlineSession* NamedSession = Sessions->GetNamedSession( GameSessionName ) )
                {
                    if( NamedSession->SessionInfo.IsValid() )
                    {
                        Sessions->UpdateSession( GameSessionName, *HostSettings );
                    }
                }
            }```

#

copy-pasta but you get the idea

solar ivy Aug 13, 2020, 2:36 PM

#

does game state object exist on client before its replicated? what's the best way to check game state has been replicated? i do it like this: in game mode OnPostLogin i call RPC on my player controller to tell client the login was successful. after receiving RPC on client i start checking on tick in my client's player controller if all important objects got replicated (game state and player state for now). i added game state replicated property on the controller and set it on server and wait for it to be replicated before executing further logic. is this a good way?

chrome bay Aug 13, 2020, 2:38 PM

#

To answer the first Q: It doesn't exist until it's replicated

#

What I like to do is put a static delegate/event in my game state class, and broadcast it in the gamestates BeginPlay() function

#

{
    if (GetGameState())
    {
        DoSetup();
    }
    else
    {
        AMyGameState::OnAvailable.AddUObject(this, &DoSetup);
    }
}

void ASomeActor::DoSetup()
{

}```

#

That sort of thing

#

Or alternatively just have a central "online events" class with a bunch of delegates instead of having them in specific classes

#

That can be quite handy

meager spade Aug 13, 2020, 2:41 PM

#

or do it even hackier, and do a timer loop 😄

chrome bay Aug 13, 2020, 2:41 PM

#

🤢

#

Looping delay nodes in BP fix everything 😄

meager spade Aug 13, 2020, 2:42 PM

#

you don't have much choice if you ONLY use BP

chrome bay Aug 13, 2020, 2:43 PM

#

yeah very true

#

Events in game instance maybe in BP?? ergh..

solar ivy Aug 13, 2020, 2:46 PM

#

@chrome bay thanks, i'll explore in that way

regal storm Aug 13, 2020, 3:49 PM

#

Hey all, wondering why everything here works except for the client can't see the changes to the server. The server and client can see their own changes, and the server can see the client change, but the client can't see the server change. Find it hard to explain these replication issues :D

📎 unknown.png

#

(For reference: This is to sync up the control rotations which is used in my anim BP for head bone rotation)

meager spade Aug 13, 2020, 3:52 PM

#

you don't need to do that tho

#

all that stuff is already available client and server

regal storm Aug 13, 2020, 3:53 PM

#

That's what I thought, but then this in my anim BP doesn't work?

📎 unknown.png

meager spade Aug 13, 2020, 3:53 PM

#

use BaseAimRotation

#

https://www.thegames.dev/snaps/rider64_IBo2YMteny.png

regal storm Aug 13, 2020, 3:54 PM

#

Ouch, that was a lot of hours wasted :D
Thank you, that works perfectly!

potent rain Aug 13, 2020, 5:22 PM

#

What udemy c++ course do you recommend on multiplayer?

#

I have one that is taught by Ben tristem and Sam pattuzzi but it seems as if it won't actually give me enough to understand and start doing multiplayer in unreal

#

What do you think?

kindred widget Aug 13, 2020, 5:33 PM

#

I think that a lot of courses are a bit of a waste. But then I'm not really academic. Multiplayer for me was really easy once I understood the difference between an RPC and Replication, and learned the basic network system and how certain native actor types interact with each other. It's just a bit of reading. If you understand how to develop single player mechanics and systems, multiplayer is very easy to understand once you start grasping those three things.

meager spade Aug 13, 2020, 5:35 PM

#

You also have to deal with things like Race Conditions

#

and stuff not being ready until its replicated

waxen socket Aug 13, 2020, 5:47 PM

#

Speaking of racing... It would appear that getting the owner or controller of my pawn on the client's BeginPlay returns null. Is hacking this in with a delay node the best way to get that controller?

chrome pulsar Aug 13, 2020, 5:49 PM

#

@here is there a way for clients to get their own ping without using PlayerState's Ping property?

meager spade Aug 13, 2020, 5:50 PM

#

@waxen socket that is hacky

#

i do it in OnRep_Controller (in C++)

#

but BP land doesn't have that luxuary

waxen socket Aug 13, 2020, 6:04 PM

#

I see, yeah. Maybe I'll have to do it in C++ then.

meager spade Aug 13, 2020, 6:11 PM

#

you can just do a timer hacker

cloud oriole Aug 13, 2020, 6:51 PM

#

Hi! I'm trying to get movement input replication working.

#

It's very laggy, I'm fairly certain that I'm doing something very wrong with how I'm making it

#

I play the game with these settings:

📎 unknown.png

#

The server owner doesn't have any lag, but stuttering and noticable slowness is on every other client

#

I've looked on forums, but there seems to be no step-by-step way to fix this, only vague answers/suggestions

📎 unknown.png

#

my setup for moving forward^

#

If you have any advice, please ping me! 🙂

bitter oriole Aug 13, 2020, 7:21 PM

#

@cloud oriole Is the Pawn a Character ?

cloud oriole Aug 13, 2020, 7:28 PM

#

Yes

bitter oriole Aug 13, 2020, 7:31 PM

#

AFAIK you don't need to RPC the movement input then

#

It should handle it internally

cloud oriole Aug 13, 2020, 7:33 PM

#

Alright

#

Thx

twin sable Aug 13, 2020, 8:40 PM

#

can tmaps be replicated yet?

UPROPERTY(ReplicatedUsing = OnRep_Resources)
    TMap<EResource, int> Resources;

oak pond Aug 13, 2020, 8:50 PM

#

hey Im wondering, is it even possible to perfectly replicate physics objects and ragdolls in unreal multiplayer? I know source engine does this flawlessly but I have no idea how to do it in unreal. have any unreal games achieved it?

oak pond Aug 13, 2020, 9:16 PM

#

well from what Ive seen around the internet, its not really possible. anyone know if its any different for unreal 5?

#

itd be amazing if ue5 is more powerful for things like this

#

cus seriously how can an engine thats about 20 years old outdo unreal so much in terms of multiplayer physics

#

quite disappointing tbh

bitter oriole Aug 13, 2020, 9:20 PM

#

@twin sable No

#

@oak pond No

#

And the reason Source outdoes UE is that Source uses Havok, and UE uses the faster but non-deterministic PhysX

oak pond Aug 13, 2020, 9:21 PM

#

yeah I figured

#

yeah I thought it was to do with physX

#

tbh Im not a fan of it

bitter oriole Aug 13, 2020, 9:21 PM

#

UE's Chaos may improve things in the coming years

oak pond Aug 13, 2020, 9:21 PM

#

yeah Im looking forward to seeing how chaos is

#

I cant find anything about it thats not just to do with the destruction stuff, but I assume its used for everything right? do we know much about it?

bitter oriole Aug 13, 2020, 9:31 PM

#

It's a work-in-progress physics engine by Epic with a focus on multiplayer and destruction

oak pond Aug 13, 2020, 9:34 PM

#

oh thats good to hear

#

honestly thatll be a really good feature of the engine to have proper networked physics

oak pond Aug 13, 2020, 10:04 PM

#

when it releasing again?

bitter oriole Aug 13, 2020, 10:21 PM

#

No one knows really

#

When it's done

hoary lark Aug 13, 2020, 10:22 PM

#

they're claiming it's both done and not done for 4.26 ElonLaffo

cloud oriole Aug 13, 2020, 10:35 PM

#

Hey, Stranger's advice worked! Thanks!
But now I have a new problem
I package my project, send it to some friends, but we cannot connect, even with the logmein hamachi program

gilded vapor Aug 14, 2020, 12:03 AM

#

Just wondering if anyone has any experience using Steams's test server (480), I was testing with a friend, (PA to NY) seemed a but laggy at times

#

Just wondering if that's related to the test server or his/mine internet connection

#

or if the test server is laggy

meager spade Aug 14, 2020, 12:10 AM

#

test server?

#

that is just a p2p tunnel

#

if its listen server, it would be your connections

cedar finch Aug 14, 2020, 12:11 AM

#

@gilded vapor I used to use it to test my game before I got my own App ID. I'm in the U.S.A and played with people from the UK and the Netherlands and we were fine. But on the other hand I played with a friend of mine who lives a mile down the street and we lagged like crazy. So I'd guess maybe it's just internet speeds.

gilded vapor Aug 14, 2020, 12:15 AM

#

@meager spade thanks so its prolly just our crap internet. (It would go inbetween being perfect and jank, and I was testing on a no-ethernet laptop)

cedar finch Aug 14, 2020, 12:18 AM

#

Yea that's probably the problem lol.

gilded vapor Aug 14, 2020, 12:20 AM

#

@cedar finch Did getting your own AppID have any effect on performance?

cedar finch Aug 14, 2020, 12:21 AM

#

I have no proof but it feels good me lol. I notice I can find my friends games quicker where as before I would sometimes not find their games or would have random peoples servers in my list for some reason lol.

#

I know it makes testing a dream come true. I don't have to reupload the entire project every time I want to test. Instead my friends only have to do 5mb update here 100mb update there. It only updates what you change. It's worth it if you do a lot of testing with friends

#

Especially if your friends are computer challenged and just want to play a game hahahahaha

gilded vapor Aug 14, 2020, 12:23 AM

#

Oh cool, so you would say its worth getting a store page at least for testing purposes?

cedar finch Aug 14, 2020, 12:24 AM

#

You don't even have to setup a store page lol. I've had my app id for about a year and have yet to setup the store page

gilded vapor Aug 14, 2020, 12:24 AM

#

My friends didn't understand clicking the 'x' on the steam-page doesn't actually close the program

#

Oh awesome

#

Maybe a dumb question. how do you go about getting an AppId? I just did a quick google search without much luck

cedar finch Aug 14, 2020, 12:28 AM

#

Oh you go to Steamworks website. Once you buy one it is a little weird to navigate and learn but they have tutorial videos and I just wrote down the steps to push updates so It's really easy for me to test. For example sometimes I forget to place playerstarts on my levels because I delete them while testing. So before I'd upload my game, go to test with friends and not spawn. Then I'd have to open up UE4 add the player starts, package, reupload my project, then wait for them to download, then test. It was a pain. Now I can just push a small 2mb update and they'll have playerstarts lol.

hoary lark Aug 14, 2020, 12:28 AM

#

you start here https://partner.steamgames.com/

gilded vapor Aug 14, 2020, 12:29 AM

#

Awesome thankyou so much

cedar finch Aug 14, 2020, 12:29 AM

#

Yea that's it. Wonder why their URL isn't steamworks?

#

Oh well hahahaha

gilded vapor Aug 14, 2020, 12:34 AM

#

bahaha

#

http://steamworks.com/

Landing Page | STEAMWORKS BREW PUB BREWERY

Named after the famous steam that runs through its historic Gastown brewpub and Burnaby Brewery. Steamworks proudly brews, distinct, delicious and award-winning craft beers.

cedar finch Aug 14, 2020, 12:37 AM

#

Hahahahahaha I guess that's why Perfect!!

#

🤣

gilded vapor Aug 14, 2020, 12:41 AM

#

Thankyou for your help again you guys have all been greatttttt

hoary lark Aug 14, 2020, 12:43 AM

#

gabe: "i want to buy your domain how much?" steamworks: "$1,000,000" gabe: "what no that's like an entire day's income"

cedar finch Aug 14, 2020, 12:51 AM

#

Hahahahaha

real wind Aug 14, 2020, 2:01 AM

#

Is there something special I have to do in a mutiplayer context when initializing an object?

AALSCharacter::AALSCharacter(const FObjectInitializer &ObjectInitializer)
    : Super(ObjectInitializer)
{
    HeldObjectRoot = CreateDefaultSubobject<USceneComponent>(TEXT("HeldObjectRoot"));
    HeldObjectRoot->SetupAttachment(GetMesh());

    SkeletalMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("SkeletalMesh"));
    SkeletalMesh->SetupAttachment(HeldObjectRoot);

    StaticMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("StaticMesh"));
    StaticMesh->SetupAttachment(HeldObjectRoot);

    AIControllerClass = AALSAIController::StaticClass();
}

This constructor appears to run on both client and server (I can make it produce logs) but then all of the class properties (HeldObjectRoot, SkeletealMesh, StaticMesh) are null and cause null pointer exceptions.

fervent spoke Aug 14, 2020, 9:14 AM

#

i'm trying to test multiplayer, and right now i'm having an issue where players who aren't the host (or all players in the case of dedicated server) can't move. they can turn their camera like normal clientside but it's not replicating.

#

📎 unknown.png

#

i didn't make a custom controller, idk if that's necessary

fervent spoke Aug 14, 2020, 9:46 AM

#

not having this problem in a fresh project

fervent spoke Aug 14, 2020, 10:08 AM

#

more info: clients can still fire their gun and it will replicate, but their camera movements don't affect where the server thinks the gun is aiming

#

so specifically the clients can't move and their camera movements aren't being acknowledged by the server

winged badger Aug 14, 2020, 10:17 AM

#

CMC usually handles the movement out of the box @fervent spoke

#

As long as you try to move via AddMovementInput in Pawn

#

Also PlayerControllers call ServerIpdateCamera function frequently

#

And where server thinks your Camera is is also the point from which it calculates distance based relevancy

#

You can get the updates camera position on server via GetPlayerViewPoint on the PC

#

You are also very likely get a warning in you output log with more details when something hoes wrong

fervent spoke Aug 14, 2020, 10:23 AM

#

LogProperty:Warning: Native NetSerialize StructProperty /Script/Engine.CharacterMovementComponent:ServerMove.InAccel (ScriptStruct /Script/Engine.Vector_NetQuantize10) failed.

winged badger Aug 14, 2020, 10:24 AM

#

that is odd

fervent spoke Aug 14, 2020, 10:24 AM

#

i figured it out

winged badger Aug 14, 2020, 10:24 AM

#

Like your Camera is null on that BP

fervent spoke Aug 14, 2020, 10:25 AM

#

the values i used were too high

#

in the character movement component

#

for accel

#

i wanted instant accel so i just used a very large number

#

and it was apparently too large

#

lol

#

my camera rotations aren't replicating still though

#

but i can move

winged badger Aug 14, 2020, 10:26 AM

#

You usually get net serialization vector warnings when you send a compressed vector with something like mouse projected to world while mouse is off screen

#

You dont need them to move

#

As long as that screen you posted happens client side

fervent spoke Aug 14, 2020, 10:28 AM

#

the character model should rotate when the camera is turned

winged badger Aug 14, 2020, 10:28 AM

#

Ah, that

#

Use GetPlayerViewPoint on server

#

To get camera forward

#

Then make rot from x if you have 3d rotation or from zx if its 2d

#

With camera forward being x and 0 0 1 going into z

fervent spoke Aug 14, 2020, 10:30 AM

#

is this something i can't do in BPs

winged badger Aug 14, 2020, 10:30 AM

#

The function is on playercontroller

#

Not pawn

fervent spoke Aug 14, 2020, 10:30 AM

#

even without the context checkbox ticked i don't see it

winged badger Aug 14, 2020, 10:31 AM

#

You can manually replicate rotations as well

#

I am not 100% on the name tho

#

Bp functions can have different names then c++

#

You do need to pull it from GetController Cast to PlayerController ref tho

#

You mentioned you dont have custom PC and GetController returns a Controller not PC

fervent spoke Aug 14, 2020, 10:33 AM

#

📎 unknown.png

winged badger Aug 14, 2020, 10:34 AM

#

Dont think thats it, and im on mobile not near a pc so cant check

#

Alternative is to send an unreliable server RPC to update rotation

fervent spoke Aug 14, 2020, 10:35 AM

#

i'm not clear what you're telling me to do even if i had the node

winged badger Aug 14, 2020, 10:35 AM

#

On tick or when it changes

#

And have a replicated rotator variable with skipowner, which sets the rotation onrep

#

With the node youd have the clirnt camera forward vector

#

And you can work out the rotation ftom there

fervent spoke Aug 14, 2020, 10:38 AM

#

to do what though

winged badger Aug 14, 2020, 10:38 AM

#

Set pawns rotation

fervent spoke Aug 14, 2020, 10:38 AM

#

i already have the camera forward vector

#

and things rotating with the camera

#

it's jsut client side

#

for example if i use a listen server, the host's camera movements can be seen by the other clients

winged badger Aug 14, 2020, 10:40 AM

#

So you need it on the server

#

As replication works only from server to clients

fervent spoke Aug 14, 2020, 10:40 AM

#

yeah

winged badger Aug 14, 2020, 10:41 AM

#

Only way for client to send data to server is a server RPC

#

In case of camera position and direction, engine already foes it under the hood

#

Im just not sure how exposed it is, was pretty sure that it is until now

fervent spoke Aug 14, 2020, 10:47 AM

#

so were you saying to set a rotator variable to RepNotify, get the camera's rot, and then with the onRep change the camera angle to match this variable?

winged badger Aug 14, 2020, 10:48 AM

#

Where other clients think your camera is is usually not important, as long as pawns rotation is correct

#

But yes

fervent spoke Aug 14, 2020, 10:49 AM

#

well the server doesn't know where i'm aiming

winged badger Aug 14, 2020, 10:49 AM

#

And i cant stress this enough - SkipOwner

fervent spoke Aug 14, 2020, 10:49 AM

#

cus it doesn't know where the camera is facing

#

so i have to fix that too

winged badger Aug 14, 2020, 10:50 AM

#

It the server starts correcting owning client on non predicted movement, youll end up with horrible jitter

fervent spoke Aug 14, 2020, 10:50 AM

#

yeah

winged badger Aug 14, 2020, 10:52 AM

#

If you havent already

#

There is a link to network compendium in pinned messages on this channel

#

Strongly tecommend giving that a read

fervent spoke Aug 14, 2020, 10:52 AM

#

ite

#

how does the server tell the clients which character they should be rotating

#

e.g. client 1 rotates, the server gets told what its rotation is.. how does the server tell client 2 that it should be rotating character 1

fervent spoke Aug 14, 2020, 11:34 AM

#

o nvm i got it

#

think i'm being dumb because it's 4:30am should go to sleep
thanks for the help @winged badger

winged badger Aug 14, 2020, 11:36 AM

#

each client + server have their own instance of Character1

#

Unreal doesn't replicate pointers, as memory address would have no meaning, but rather each Actor is assigned a NetGUID

#

and each Actor that replicates has its own ActorChannel over which it replicates

meager spade Aug 14, 2020, 11:47 AM

#

@winged badger GetPlayerViewPoint is not exposed, i did make PR for it to be exposed but they haven't even looked at it lol

winged badger Aug 14, 2020, 11:48 AM

#

that figures

meager spade Aug 14, 2020, 11:48 AM

#

kinda silly

#

when it's so handy

winged badger Aug 14, 2020, 11:48 AM

#

kinda? its outright sloppy

frozen brook Aug 14, 2020, 12:00 PM

#

Hello guys

#

How do I implement friendly fire

#

Like disable friendly fire in team deathmatch

bitter oriole Aug 14, 2020, 12:08 PM

#

Just check the team of the weapon's owner on hit

meager spade Aug 14, 2020, 12:16 PM

#

i made a filter struct

#

which checks lots of things (like can damage buildings, can damage AI, can damage friendly ai, etc)

#

and i run the hitresult through that and it spits out if it can apply damage

gusty raptor Aug 14, 2020, 12:19 PM

#

Hi, so im trying to replicate my actors with skeletal mesh just using ReplicateMovement. it seems client is laggy updated from server, while characters aint.. any idea?

bitter oriole Aug 14, 2020, 12:25 PM

#

"Replicate movement" is really "replicate transform", does not handle movement

meager spade Aug 14, 2020, 12:53 PM

#

yeah there is no smoothing its just, actor is here, now here, now here etc

#

so it will be horrible

gilded vapor Aug 14, 2020, 1:24 PM

#

I have an GameplayAbility that stuns the target. The ability itself (the attack that stuns) is locally predicted, the resulting stun effect however is set to server-initiated.
Is it okay to have the stun local-predicted?

I've read that its awkward to local-predict damage/stunning, does anyone have any experience if this is true?
I imagine that it would improve game smoothness when it predicts correctly (though it would look worse when predicts incorrectly)

meager spade Aug 14, 2020, 1:40 PM

#

stun should only happen once the server confirms that stun can be applied

#

else player could get stunned in a fight for no reason

#

and that would be horrible

gleaming niche Aug 14, 2020, 1:41 PM

#

he means predicting the stun of the other person, locally.

#

so you hit someone, and stun them, but you see them stunned before they actually are, assuming the server will accept it, so if you have 300 ping, there's no visual delay

#

and my take on that, sometimes it's okay. but in previous games I worked on many years ago, we had stuff like that, including playing the blood on the client side traces

#

and it ends up pissing people off, because they are sure their shots are hitting

#

when they really aren't

#

so we changed it so blood and stuff is dispatched from the confirmed damage, later, even with the ping delay, and everyone was happy

#

it's a balancing act really

#

non-consequential things are nice to predict, because it makes it smoother, but some things cause more confusion

gilded vapor Aug 14, 2020, 1:47 PM

#

My current issue is that I have a guard ability that plays a specific block animation (based on the hitresult) and having any delay between the two is super awkward. (In really latent situations the player could stop guarding but than jump to the successful-block animation)

#

So I think that may cause more confusion in really latent situations?

meager spade Aug 14, 2020, 1:49 PM

#

i know what he was on about

#

and i stated, stun should only be authorized by the server

gleaming niche Aug 14, 2020, 1:50 PM

#

it didn't sound like it "else player could get stunned in a fight for no reason"

meager spade Aug 14, 2020, 1:50 PM

#

especially if it stops the player being able to move/attack

gleaming niche Aug 14, 2020, 1:50 PM

#

it sounded like you meant you could stun someone else

#

or be stunned, when you shouldn't

#

which is not even the case at all

gilded vapor Aug 14, 2020, 1:50 PM

#

A successful block effectively stuns your character for about a quarter of a second

meager spade Aug 14, 2020, 1:50 PM

#

yes, if it was predicted, player could be stunned when they were not actually stunned

gleaming niche Aug 14, 2020, 1:50 PM

#

it's you hitting someone else, and locally making the OTHER player look like they are stunned

#

even if the message hasn't come through yet from the confirm

#

so it is "smooth"

#

not predicting yourself being stunned from someone else maybe hitting you

#

that make no sense

#

becuase if you're able to receive an event that would cause you to predict yourself being stunned by someone else

#

you would be receiving the confirm from the server

#

so therefore you should actually be stunned

#

ah okay

#

i missed that one line there

#

you're saying

#

when YOU block someone else

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YOU get stunned?

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i thought you were talking about hitting someone else, and stunning them

#

my bad.

gilded vapor Aug 14, 2020, 1:54 PM

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If you block an attack you get stunned, though ideally it should be smooth both ways

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Maybe in magical fairly tail land I can predict the block on other targets, and have it server initiated on my own

gleaming niche Aug 14, 2020, 1:54 PM

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in my other game that is down now, we had that with knives

#

you can block

#

and we did predict that actually

meager spade Aug 14, 2020, 1:55 PM

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i just have a rule of thumb, anything that can alter gameplay and can cause confusion, should not be predicted. Like when i fire a weapon in my game, i show the muzzle fx, and the trail, all locally, but the actual hit confirmation (hit marker, impact, blood, etc) only happens on server confirmation (non predicted)

gleaming niche Aug 14, 2020, 1:55 PM

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however, it's different engine.

meager spade Aug 14, 2020, 1:55 PM

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i use Gameplay Abilities for my weapons

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just like @gilded vapor

gilded vapor Aug 14, 2020, 1:55 PM

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woot woot GAS

meager spade Aug 14, 2020, 1:56 PM

#

but i only have basic stun, ie stun grenades, that kinda thing

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not blocking stun from melee attacks

gleaming niche Aug 14, 2020, 1:56 PM

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oh wait, no i am wrong. we didn't stun the person who bocks.

#

we stunned the person attacking

gilded vapor Aug 14, 2020, 1:57 PM

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Yeah I'm gonna test the local-prediction and see if its better/worse, its a little bit awkward to see a sword go through your character and than get staggered .2 seconds later

gleaming niche Aug 14, 2020, 1:57 PM

#

if they hit a blocking player, THEY are stunned, not the player who blocks

gilded vapor Aug 14, 2020, 1:57 PM

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If you hit a blocking player the blocking player is stunned

gleaming niche Aug 14, 2020, 1:57 PM

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yeah you're doing the opposite.

gilded vapor Aug 14, 2020, 1:57 PM

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(though there will be deflects, so if you get deflected you get stunned)

#

So i actually need to handle both cases

gleaming niche Aug 14, 2020, 1:58 PM

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ours was more like.. for honor

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if you block, you aren't stunned, you can counter.

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the person hitting your knife is the one who gets stunned, because they were blocked, giving the defender the option to counter-attack.

gilded vapor Aug 14, 2020, 1:59 PM

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Our block is like in Sekiro where if you have a succesful block against a heavy attack you have a small "block animation" that prevents movement/abilities

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If you deflect its the same jist where you get to counter-attack

gleaming niche Aug 14, 2020, 2:00 PM

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well either way i refer back to what i said before about it being a balancing act, i'd almost say just test it a lot, with various pings

#

determine how often it actually fails

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if it seems too flakey to predict, then don't

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if it ends up being reliable, go for it

#

you may still get the random case where it does fail, but if it's within an acceptable threshold

#

and if it only happens after like 1000 ping, then that's acceptable too

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or hell even >500

meager spade Aug 14, 2020, 2:02 PM

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yeah i test with 300 ping

gleaming niche Aug 14, 2020, 2:02 PM

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action games are not really playable without prediction anything over 300 usualyl

meager spade Aug 14, 2020, 2:02 PM

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its like a good testing ground

gleaming niche Aug 14, 2020, 2:02 PM

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and anyone expecting them to be smooth is delusional 😉

gilded vapor Aug 14, 2020, 2:02 PM

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Would either of you know the average ping on a p2p system?

meager spade Aug 14, 2020, 2:03 PM

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depends on the host, and the distance from host to players

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NAE to EU would be around 70-130 ping

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for example

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on a good connection

gleaming niche Aug 14, 2020, 2:03 PM

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that's kind of hard to judge. best is to just shoot for something reasonable that everyone knows

#

as a baseline.

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like the 300

meager spade Aug 14, 2020, 2:04 PM

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300 is what i get playing with australians

gleaming niche Aug 14, 2020, 2:04 PM

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as your top end of "it will never be smooth after this, no matter what"

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something kind of funny, with counter-strike

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in the early betas, i think all the way up to 1.6 for that matter

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everyones ping was artificially modified on the scoreboard

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-10 or something

gilded vapor Aug 14, 2020, 2:05 PM

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Lol for what reason

gleaming niche Aug 14, 2020, 2:06 PM

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cuz people wre bitching about it, and so minh was annoyed, so he just artificially reduced it and said "optimized blah blah"

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and everyone believed it

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noone complained again

gilded vapor Aug 14, 2020, 2:06 PM

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That's amazing

gleaming niche Aug 14, 2020, 2:06 PM

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i did something similiar in another half-life mod at the time, with damage lol.

waxen socket Aug 14, 2020, 2:15 PM

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Good morning. Should pawns always be spawned on the server?

chrome bay Aug 14, 2020, 2:23 PM

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yep

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Everything network relevant should be spawned on the Server

waxen socket Aug 14, 2020, 2:24 PM

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Thanks, Jambax. And in that case, the server owns the pawn?

chrome bay Aug 14, 2020, 2:24 PM

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Not neccesarily

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Anyone can be the owner, but the Server is the authority

waxen socket Aug 14, 2020, 2:25 PM

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Once it's possessed, who owns it?

chrome bay Aug 14, 2020, 2:25 PM

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By default the player possessing it IIRC

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Since possession explicitly sets the owner to that controller

waxen socket Aug 14, 2020, 2:26 PM

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So then a RunOnOwningClient RPC would run on... the server?

chrome bay Aug 14, 2020, 2:26 PM

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It would run on the client who is the owner of that pawn

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If a client doesn't own it, it would run on the Server.

waxen socket Aug 14, 2020, 2:28 PM

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So...

Spawn a controller on a client.
Spawn a pawn on the server
Possess the pawn.
Pawn RoOC now runs on the client?

chrome bay Aug 14, 2020, 2:29 PM

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You wouldn't spawn a controller on the client

waxen socket Aug 14, 2020, 2:29 PM

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Oh.

chrome bay Aug 14, 2020, 2:29 PM

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anything relevant to the network is spawned server-side - always.

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If you spawn that on a client, it only exists on that client and nothing else will know about it

waxen socket Aug 14, 2020, 2:30 PM

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I see, but player controllers are at least owned by the client using them.

chrome bay Aug 14, 2020, 2:30 PM

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They're owned by them yeah, but the server is still the one who spawns them and has authority.

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Ownership != Authority

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They're two different concepts

waxen socket Aug 14, 2020, 2:31 PM

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Okay, I think that has confused me till now.

chrome bay Aug 14, 2020, 2:32 PM

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A connection has authority over an actor when:

The actor was spawned on that connection.
The actor has been "torn off" by the Server.

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Ownership is explicitly set with SetOwner() (Server-Side). That determines who has permission to call Server RPC's on that actor, and who will receive client RPC's for it.

waxen socket Aug 14, 2020, 2:34 PM

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I see.

chrome bay Aug 14, 2020, 2:35 PM

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I expect that if you call a Server/Client RPC on an actor that you spawned client-side, it will probably execute on that client - but it's not a usual code path so I'm not sure.

waxen socket Aug 14, 2020, 2:35 PM

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And do you have similar feelings about RoOC as you do about Multicast?

chrome bay Aug 14, 2020, 2:36 PM

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Client funcs are okay, usually they're pretty specific

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Multicast is okay btw 😄

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But for states or very frequently repeating effects, I prefer vars

waxen socket Aug 14, 2020, 2:36 PM

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You've taught me to hate them.

chrome bay Aug 14, 2020, 2:36 PM

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😄

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They just have a very specific purpose IMO

waxen socket Aug 14, 2020, 2:37 PM

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Everyone else tells me to use them but I follow the way of Jambax.

chrome bay Aug 14, 2020, 2:37 PM

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Like say, a chat message. You wouldn't want to replicate a TArray of chat messages, so sending them via reliable multicast would make more sense.

waxen socket Aug 14, 2020, 2:39 PM

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So here in the eXi bible, it says "Un-possessing it will result in the Client no longer owning the Pawn."

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So on unpossess, the server becomes the owner of the pawn again?

chrome bay Aug 14, 2020, 2:39 PM

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I actually think they don't have an owner once unpossessed

waxen socket Aug 14, 2020, 2:39 PM

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Oh. That's so sad.

chrome bay Aug 14, 2020, 2:39 PM

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So by default, nothing has an owner unless you spawn it with one.

waxen socket Aug 14, 2020, 2:40 PM

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Ohhh.

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Ohhhhh.

chrome bay Aug 14, 2020, 2:40 PM

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But Possess/Unpossess makes calls to SetOwner() to explicitly set the owner to the controller

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Or clear it in the case of unpossessing

waxen socket Aug 14, 2020, 2:40 PM

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Okay. I'm clear on that.

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I need a Jambax hotkey.

chrome bay Aug 14, 2020, 2:40 PM

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😄

waxen socket Aug 14, 2020, 2:42 PM

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I'm struggling with some timing issues in Blueprints right now. My ship tries to access its player controller before it's possessed and it throws an error. I was going to try making a hacky "validity timer" but now I see I can override Possessed() in Blueprints so I'm gonna try that route.

chrome bay Aug 14, 2020, 2:43 PM

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That may work, I'm not entirely sure how/where those get called.

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In CPP, the most reliable place I've found is AController::SetPawn();

waxen socket Aug 14, 2020, 2:44 PM

#

📎 Screen_Shot_2020-08-14_at_11.43.59_AM.png

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What do you think it means by "Normally"?

chrome bay Aug 14, 2020, 2:50 PM

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Oh, yeah you know what it may well only happen on the Server.

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Wouldn't surprise me

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And since you can't override the existing OnReps in Blueprint... RIP.

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Yeah, looks like those functions will only fire on the Server

waxen socket Aug 14, 2020, 2:52 PM

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Yeah, I just gave it a quick try. No luck.

chrome bay Aug 14, 2020, 2:53 PM

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This is one of those "basic networking shit in BP is a pain in the ass" moments.

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But yeah you'll just need to check and cast the controller when you need to use it in the pawn to get around it

waxen socket Aug 14, 2020, 2:55 PM

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I suppose that's fine. I can do it in the spawning animation before I even give control to the player anyways so no big deal.

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Actually, I think I got it working with OnPossess in the controller.

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Nope... Ah well. Thanks again for your time today!

sterile shale Aug 14, 2020, 3:56 PM

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do i have to use ustructs when i make it a ufunction?

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i got a snake game and im trying to send the servers location list to the clients real quick at begin play, but my tarray of locations is a TArrray<struct myvector> so itll be lightwieght lol it saves alittle data having a custom vector of just three variables and no mem functions,

grave notch Aug 14, 2020, 4:39 PM

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I use default movements for my character, and when i host multiplayer game, on all clients replications look perfect (movement + animations), but on server (host player) it looks like they in low fps or something like that (movements + even animations). Anyone know how it fix it?

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I don't use any RCP functions

rose egret Aug 14, 2020, 4:56 PM

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how you guns implemented foot step sound in FPS multiplayer ?

gleaming niche Aug 14, 2020, 5:00 PM

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i made a footstep component, that just runs locally for everyone based on movement, since i didn't care about syncing with actual feet animation.

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the timing makes it pretty close, just not perfectly synced.

round mesa Aug 14, 2020, 5:11 PM

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hey guys, im having a problem with calling a RPC

marble gazelle Aug 14, 2020, 5:11 PM

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Ok

round mesa Aug 14, 2020, 5:12 PM

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So i want to change the color of a pawn when it has less then 0 health, and right now when i call run on sever from the blueprint of the guy that died, it doesn't call the server (i need that so i can send a multicast to everyone to change that pawns color)

#

📎 unknown.png

#

📎 unknown.png

#

📎 unknown.png

marble gazelle Aug 14, 2020, 5:14 PM

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you cant send a RPC to the server, if the actor is not your player char or controller

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you also should never allow RPCs to the server for NPCS, the server should decide to set the color

round mesa Aug 14, 2020, 5:15 PM

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this is not from a NPC

rose egret Aug 14, 2020, 5:15 PM

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@gleaming niche I wanted to do the same but didnt know what to write exactly, since I have crouch, walk, run and what them to be heard by local client.
currently I am trying to use anim notify 🙂

round mesa Aug 14, 2020, 5:15 PM

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this is in the thirdpersoncharacter BP

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i referred to it as pawn as that's what the other clients see (i think)

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they don't get the full player controller, right?

marble gazelle Aug 14, 2020, 5:17 PM

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they don't get the player controller at all, just the owning connection

round mesa Aug 14, 2020, 5:18 PM

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oh

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so why does the rpc run on server not work if its from a replicated player

marble gazelle Aug 14, 2020, 5:20 PM

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If you are not the owning connection, you can't send an RPC to the server

round mesa Aug 14, 2020, 5:20 PM

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how do i tell if im the owning connection for a player

marble gazelle Aug 14, 2020, 5:21 PM

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Locally Controlled -> Owner

round mesa Aug 14, 2020, 5:21 PM

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in this

#

📎 unknown.png

marble gazelle Aug 14, 2020, 5:21 PM

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But why do you need to send this to the server anyway?

#

The server has authority on life, he should know when its 0 and multicaste what ever you want

round mesa Aug 14, 2020, 5:22 PM

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that is my health check

#

oh

#

that makes sense

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its my first time trying to do multiplayer. Its confusing man

marble gazelle Aug 14, 2020, 5:22 PM

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besides that, you don't need the multicast at all

#

just replicate the health and do on rep health a check if its 0 and set the color accordingly

round mesa Aug 14, 2020, 5:23 PM

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how do i check for overlap between a projecile and player on server side only then?

marble gazelle Aug 14, 2020, 5:24 PM

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you shouldn't, since you maybe want hit response simulated

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just guard your functions with an authority check / is server

round mesa Aug 14, 2020, 5:26 PM

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so currently the projectile detects overlap with a player across all game instances and players, and calls the take damage function on that player ( on all clients and server instance of that player)

#

so i should put a authority check before the take damage function, so that health is only calculated on the server?

marble gazelle Aug 14, 2020, 5:27 PM

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well you can simulate it client side, but then you need to reconcile if the prediction was faulty

round mesa Aug 14, 2020, 5:40 PM

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THANK YOU

#

it works now

#

🙂

marble gazelle Aug 14, 2020, 5:40 PM

#

👍🏻

dull flame Aug 14, 2020, 7:25 PM

#

would anyone be willing to help me with some server/client physics replication and desync issues?

#

i think i just need someone who understands it better than I do to help explain whats going wrong

dull flame Aug 14, 2020, 7:41 PM

#

im trying to do the physics server side, and it all works fine, but im not sure how to sync the client's view to be what the server sees

#

how do i get the transform that the server think's is correct from the pawn BP of the client?

#

nevermind, i figured it out

#

i was just being stupid

queen flower Aug 14, 2020, 7:47 PM

#

@dull flame what was the solution?

dull flame Aug 14, 2020, 7:48 PM

#

@queen flower i was making everything way too complicated with multicast functions, and didnt realize that when setting the component to replicate, i think that automatically sets the client's transform to be what the server has? From there i just made all of my physics called on the server, and it would auto replicate down to clients

#

i think that was what's going on, but i could be wrong and just lucky

queen flower Aug 14, 2020, 7:50 PM

#

im having basic level issues too with understanding what the types of replication are

dull flame Aug 14, 2020, 7:50 PM

#

i can try and help, but i dont consider myself very good at ue4's networking

queen flower Aug 14, 2020, 7:50 PM

#

like, 2 players can join the same game, but using the top down template, I cant seem to get the client to move.

dull flame Aug 14, 2020, 7:51 PM

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the client to move at all, or is it not moving on the server's screen

queen flower Aug 14, 2020, 7:51 PM

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not moving anywhere

#

at best, I had client stuttering

#

but wouldnt rotate.

dull flame Aug 14, 2020, 7:51 PM

#

are you using the steam subsystem stuff and all that?

queen flower Aug 14, 2020, 7:51 PM

#

server moves fine for client and server

dull flame Aug 14, 2020, 7:51 PM

#

k

queen flower Aug 14, 2020, 7:51 PM

#

yea

#

dont think id be able to get 2 players into the same game without those subsystems

dull flame Aug 14, 2020, 7:52 PM

#

idk i would try and debug by looking at if the client is even possessing a pawn in the first place

#

and then look at how your putting the input into said pawns

#

cause if it was a replication issue, the client would move around fine on its own screen, just not the server's

#

im pretty sure

queen flower Aug 14, 2020, 7:53 PM

#

hmmmmmm

#

are you using player starts?

dull flame Aug 14, 2020, 7:55 PM

#

just one but i think you can use more

#

i just have one, and then move the host out of the way

queen flower Aug 14, 2020, 7:55 PM

#

📎 unknown.png

#

any idea if these influence the controller that ius received?

dull flame Aug 14, 2020, 7:56 PM

#

try to turn the auto input off on the player start

#

and make sure "auto possess player" is off in your pawn

#

i find that with networking things, whenever i try and do something pretty basic, the defaults tend to work for most things

#

i totally get the whole "im just gonna change a bunch of things and lose track of what i changed" cause i just finished doing that for 2 hrs lol

queen flower Aug 14, 2020, 8:00 PM

#

lol I am just following mixed information online

dull flame Aug 14, 2020, 8:00 PM

#

yeah i feel that

queen flower Aug 14, 2020, 8:00 PM

#

conflicting methods i think

#

I cant seem to get the player index

dull flame Aug 14, 2020, 8:08 PM

#

?

queen flower Aug 14, 2020, 8:08 PM

#

well, cant get movement to work still

#

but I didnt change anything beyond those player starts

dull flame Aug 14, 2020, 8:09 PM

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i would reset the player start to all defaults, ive gotten everything i need without changing them

queen flower Aug 14, 2020, 8:09 PM

#

the topdown template handles movement a little differently