#gameplay-ai | Unreal Source | Page 114

vital pond Jul 17, 2019, 12:49 AM

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turns out the chicken was roughly the size I wanted, and my human reference was too large

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thank you!

vast jacinth Jul 17, 2019, 5:33 AM

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@vital pond good to hear 😃 like I said, AI in unreal is a messy ball of sring. its all there, but you have to pull for the right end to get what you need

naive veldt Jul 17, 2019, 9:32 AM

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In a Blueprint Task, how do I reference the pawn that is running the behavior tree that is executing said task?

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lol nvm just noticed the owner actor output 😙

flint trail Jul 17, 2019, 2:11 PM

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@tardy scarab any chance you guys can cover Navigation system settings (in the project settings and recast actor/component in the level), navigation and multiple streaming levels (assuming each level having its own nav bounds volume), ProjectPointToNavigation Blueprint node in the next AI stream?

flint trail Jul 17, 2019, 2:32 PM

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hmmm

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I found this https://answers.unrealengine.com/questions/827594/more-level-streaming-with-static-navmesh.html

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is this still the case in 4.22 ? Cuz I can't get ProjectPointToNavigation working having multiple streaming levels and multiple nav mesh bounds (each streaming level has its own).

meager pike Jul 17, 2019, 2:56 PM

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Do I need to manually destroy an AI controller after I destroy its controlled pawn?

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Or is that done automatically

slim knoll Jul 17, 2019, 3:22 PM

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I'm using the Advanced locomotion system v3 and i'm trying to get my custom character controlled by AI. Has someone successfully done that and could help me out?

supple sky Jul 17, 2019, 4:55 PM

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@slim knoll Hi there.

slim knoll Jul 17, 2019, 5:03 PM

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Here is my AI controller:

📎 unknown.png

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When i hit play the Character moves for like 1 second, than the character doesnt continue. I cant find the error as it works perfectly on other characters which dont use ALS

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📎 unknown.png

supple sky Jul 17, 2019, 5:32 PM

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Aimoveto doesn't have a pawn attached.

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I'm surprised it will let you run.

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Can you use breakpoints to follow what it's doing?

tardy scarab Jul 17, 2019, 5:41 PM

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@flint trail You should comment on the announcement post as soon as it goes live later this week

slim knoll Jul 17, 2019, 9:29 PM

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@supple sky i added the pawn node and it still doesnt change. Looks like this: Knight has basic mixamo animations and AI controller works perfectly. Woman has ALS Movement animation (just like player) and only moves for a short periode.

📎 2019-07-17_22-26-18_Trim_convert-video-online.com.mp4

lyric flint Jul 18, 2019, 2:49 AM

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@noble vault A mindmap is a visual representation of what will be needed to achieve something

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https://simplemind.eu/wp-content/uploads/2017/01/Basics-figure-10.png

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^ like that

flint trail Jul 18, 2019, 3:15 AM

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sooo, I am back to square one 😦

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https://www.youtube.com/watch?v=eM33hXXcF2E

YouTube

motorsep

2019 07 17 22 03 33

▶ Play video

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any idea why ProjectPointToNavigation doesn't work in the upper room and works only in some areas in the bottom room ?

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@tardy scarab by chance, did you ever have issue like this https://answers.unrealengine.com/questions/910264/projectpointtonavigation-is-no-longer-working.html ?

tardy scarab Jul 18, 2019, 3:33 AM

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I can't tell what your problem is, does the function return false when it shouldn't?

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@flint trail

flint trail Jul 18, 2019, 3:33 AM

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it returns 0,0,0 when it should return something close to trace hit location

tardy scarab Jul 18, 2019, 3:34 AM

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At 2:44 you're not receiving any values, and that trace is done in the location of an actor that says "inventory"

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Try turning off "can ever affect navigation" on that actor

flint trail Jul 18, 2019, 3:35 AM

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then navmesh won't be built there

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err, not what I meant

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that box is ticked off

tardy scarab Jul 18, 2019, 3:35 AM

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Try removing it and trace there again

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Or see if you have other possible actors in those locations

flint trail Jul 18, 2019, 3:36 AM

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nope, none

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it's just floor

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floor's static mesh tile

tardy scarab Jul 18, 2019, 3:37 AM

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Is the function returning true?

flint trail Jul 18, 2019, 3:39 AM

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false

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basically, to simplify this, I have one static mesh, navmesh, and I get true on one part of the static mesh and false in another part of static mesh

flint trail Jul 18, 2019, 11:34 AM

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I am pretty sure someone else also had similar issue https://answers.unrealengine.com/questions/910264/projectpointtonavigation-is-no-longer-working.html How did you fix it / worked around it?

flint trail Jul 18, 2019, 1:39 PM

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heh, my timing is perfect - every time I have issues and come to this chat, it appears to be dead 😂

pine steeple Jul 18, 2019, 2:00 PM

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i use Project point to navigation a lot

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and don't have any issues with it

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most of the issues are related to bad collisions on actors

flint trail Jul 18, 2019, 2:05 PM

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@pine steeple bad how? I get trace hitting actors correctly, meaning collision is there

pine steeple Jul 18, 2019, 2:06 PM

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project works slightly different to traces

flint trail Jul 18, 2019, 2:07 PM

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the mystery is that it worked until it stopped working :/

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actually I just remembered one detail - I rotated one of the navmesh bounds volumes in one of the sublevels by accident and I think after that it all stopped working

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the only thing I have in mind is deleting all the navmesh bounds volumes, recast actor, deleting Intermediate folder, rebuilding geometry and lighting, and adding navmesh bounds volumes again

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@pine steeple do you have streaming levels in your project? How do you set up navigation to work properly with streaming levels ?

tardy scarab Jul 18, 2019, 3:15 PM

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@flint trail I have streaming levels, but I keep the Navmesh in the persistent level because each of the sublevels have their center at 0. It was just easier to make sure that any level I added had a functioning NavMesh

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I don't think I've ever rotated a navmesh...

flint trail Jul 18, 2019, 3:17 PM

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well, I don't know (and there is no way to tell) if rotating broke it.. Maybe it wasn't even working the way it suppose to work to begin with after upgrading my project to 4.22

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just saying I am not doing anything different from my 4.19/4.20 project.. It's the same setup and BP code

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it just doesn't work at all

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ProjectPointToNavigation that is

tardy scarab Jul 18, 2019, 3:18 PM

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I would go through your idea of removing/deleting intermediate/adding and rebuilding

flint trail Jul 18, 2019, 3:18 PM

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yeah, I am gonna have to try that since nothing else works

tardy scarab Jul 18, 2019, 3:18 PM

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Just do it for one sublevel, don't load the persistent and you can just try on that one

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I still believe there's something interfering with the ProjectPoint trace and what's there, since it works some of the time

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I've had to "nudge" the nav mesh a couple of times (move it, then move it back). Have you tried that?

flint trail Jul 18, 2019, 3:22 PM

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yeah, I did.. Nothing changed. If I expand query extent to 5000 units, I suddenly get it working, but returned values are by 1000 units off the trace hit values

supple sky Jul 18, 2019, 3:22 PM

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I'm back.

tardy scarab Jul 18, 2019, 3:22 PM

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Yeah there's something in your scene that's interfering with the ProjectPoint-trace

flint trail Jul 18, 2019, 3:24 PM

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@tardy scarab is there any way to visualize ProjectPointToNavigation trace ?

tardy scarab Jul 18, 2019, 3:24 PM

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That's a good question!

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Might have to do it in C++

flint trail Jul 18, 2019, 3:25 PM

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😦

pine steeple Jul 18, 2019, 3:36 PM

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@flint trail never used streaming levels

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but i am assuming the navmesh is valid on all levels

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and verified ai can walk on it etc/

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?

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there is a bug with Navmesh on streamed levels

flint trail Jul 18, 2019, 3:37 PM

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@pine steeple well, at this point it's for validating landing spot (VR teleportation locomotion)

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and I deleted navmesh bound volumes from streaming levels, left original one only and moved it to persistent level. Rebuilt paths and ... still having same issues

night pilot Jul 19, 2019, 7:18 AM

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Hey guys
I want the correct behavior of the crowd. Pawns must avoid each other.
Detour Crowd AI Controller doesn't work for pawns. Any ideas? I can't to use character.

https://cdn.discordapp.com/attachments/221798862938046464/601477065467887655/unknown.png

fiery sorrel Jul 19, 2019, 11:46 AM

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Can use Flocking with obstacle avoidance

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https://gamedevelopment.tutsplus.com/tutorials/3-simple-rules-of-flocking-behaviors-alignment-cohesion-and-separation--gamedev-3444

Game Development Envato Tuts+

3 Simple Rules of Flocking Behaviors: Alignment, Cohesion, and Sep...

In the natural world, organisms exhibit certain behaviors when traveling in groups. This phenomenon, also known as flocking, occurs at both microscopic scales (bacteria) and macroscopic scales...

wary ivy Jul 19, 2019, 12:04 PM

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I think you need to use the character class if you want navmesh walking out of box

golden sage Jul 19, 2019, 5:17 PM

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Hi,
these big, complex Behavior Trees are sucking the life out of me. How can i divide different Orders or Tasks in multiple much smaller BT´s and then start and end one when i need it? Like go walk there and attack or go walk there and build stuff could be two different BT´s.
Its harder for me than expected.

golden sage Jul 19, 2019, 6:08 PM

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Never mind, using one idle Bt and using StopTree and StartTree is working for me

patent hornet Jul 19, 2019, 9:11 PM

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there is a task RunBehaviorTree

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@golden sage

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then you encapsulate atomic behaviors in their own BT assets

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and run those as needed

errant maple Jul 20, 2019, 1:29 AM

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Any idea why my character isn't moving?

📎 dc90420d618e4b007df99791d7e4ebc9.png

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https://gyazo.com/3daadce7489783cd51583eded9c4f5b0

Gyazo

▶ Play video

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The logic all seems to work fine, the only issue is that he's running in place for some reason. I tried making another character with only AiMoveTo on beginplay and it worked fine, so I'm guessing I made a dumb mistake somewhere lol

errant maple Jul 20, 2019, 2:36 AM

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Seems to be the teleport messing it up, ran it without teleporting and it works fine. It doesn't seem to be the teleport destination that's the issue because if the character starts off in that location instead of teleporting to it, it still moves fine.

vagrant summit Jul 20, 2019, 6:07 AM

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@errant maple I'd highly recommend doing AI behavior in a BT
BP ai is hard to debug

golden sage Jul 20, 2019, 11:48 AM

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@patent hornet Yeah the BT-Task RunBehavior. But it would still be to big. I have like 15-20 different Orders a NPC can receive. Putting these all in one big BT (even with sub BTs) would kill me. I saw someone making one BT for each single Order and that was much easier to handle, but i didnt know how to switch between these "Main"-BTs.

sturdy blade Jul 20, 2019, 12:15 PM

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Hello everybody! I've just do my first behavior tree, based on a very simple tutorial to make an NPC walk after the player. Root, Selector, Move To (player character)... And nothing, the BT flashing, no reaction in the AI Blueprint of the Follower... I put the NavMesh, the blueprint in the follower Pawn... I don't get it... I know a guy with the same problem, can you help us?

golden sage Jul 20, 2019, 12:39 PM

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hard to tell where it goes wrong, but if u post your Ai-Controller-Setup and the BT as pics im sure we find the reason. NavMesh is showing if u click P in editor?

sturdy blade Jul 20, 2019, 12:45 PM

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📎 1.jpg

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📎 2.jpg

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And yes, the NavMesh clearly appear

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The Dilatanus is the follower, and the player character has key object in the blackboard

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📎 NaughtyRocket_-_Unreal_Editor_9.jpg

golden sage Jul 20, 2019, 12:53 PM

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On the AiController is the RunBehaviorTree alone enough i think, cause ur BB is attached to the BT in the BT. I could imagine the problem is that u set the PlayerCharacterKey before u start the Bt. Or in the SetKeyAsObject-node .Has key name the exact same value as the BB-Var name?

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ahh one thing comes to my mind. on the ai-controller, on BeginPlay. AFter u startet the BB And BT put an delay node with 0.5 and then do SetValueAsObject. Does it work then?

sturdy blade Jul 20, 2019, 12:59 PM

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oh, let me try it, brb

patent hornet Jul 20, 2019, 1:01 PM

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controllers don't have a pawn on BeginPlay

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unless they are replicated PCs on client

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similarly, Pawns don't have a controller

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use OnPossess, please do not use Delays

golden sage Jul 20, 2019, 1:04 PM

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so its to early for each other right? i think he just wanted it to work before he sets up an overlap or button for the setValueAsObject

sturdy blade Jul 20, 2019, 1:05 PM

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ok not much seems to work now

golden sage Jul 20, 2019, 1:06 PM

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i think that happens most at start. but as Zlo wrote, dont use delays there 😅

sturdy blade Jul 20, 2019, 1:07 PM

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yeah haha i deleted it

patent hornet Jul 20, 2019, 1:07 PM

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it doesn't have to be, but if you use the stuff out of the box it is

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unless construction is deferred

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spawning an actor (and in this case both the Pawn and Controller count) will result in it calling its BeginPlay synchronously

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and possess is called right after

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but if you were to spawn a Pawn deferred, (c++ required), Possess it, then call FinishSpawning()

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then it would have controlelr on BeginPlay 😄

sturdy blade Jul 20, 2019, 1:11 PM

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one more info, whenever i start simulating the game, the nodes in the BT starts flickering like crazy

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oh wait

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I'v find a solution (not using the Behaviour Three for now but it work)

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📎 unknown.png

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That in the follower blueprint

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Thanks a lot for your help, I take screenshots to think about it!

pine steeple Jul 20, 2019, 1:29 PM

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wow

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calling Moveto in tick

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that == bad

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honestly that is terrible

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i cant even imagine a worse thing to do tbh and there is lots of bad things

sturdy blade Jul 20, 2019, 1:55 PM

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Okey^^'

pine steeple Jul 20, 2019, 2:10 PM

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im not being nasty, but that creates a new object every tick, which in a 60fps game is 60 object per second

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what is your issue tho?

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or even if its not the task version, thats still a path finding request every tick, which is expensive

sturdy blade Jul 20, 2019, 2:12 PM

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A friend just explained me that^^' I just can't Use the Behavior three for the simple tutorials I can find, to make an NPC follow the player I begin with this very short tutorial https://www.youtube.com/watch?v=Z3mWSpKb3Kw&t=67s

YouTube

Jayanam

Unreal Engine AI Controller Follow Player

In this Unreal Engine Tutorial I show how to add an enemy with an AI Controller that follows the player. It is a very simple AI but I introduce some basic AI...

▶ Play video

pine steeple Jul 20, 2019, 2:13 PM

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you can

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that's what behaviour trees are for

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and its very simple

sturdy blade Jul 20, 2019, 2:14 PM

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Yes, but each time, I got a flickering of my BT at Simulate

pine steeple Jul 20, 2019, 2:14 PM

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why you simulating?

sturdy blade Jul 20, 2019, 2:14 PM

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It seam very easy

pine steeple Jul 20, 2019, 2:14 PM

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and not playing

sturdy blade Jul 20, 2019, 2:14 PM

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yes yes, I wan't to say playing

pine steeple Jul 20, 2019, 2:14 PM

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ok

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look, this is how easy it is

sturdy blade Jul 20, 2019, 2:15 PM

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I know, I do it three time, with the same result...

pine steeple Jul 20, 2019, 2:15 PM

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check pm

thick surge Jul 20, 2019, 3:19 PM

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hi guys something really advanced I wanted to ask, has anybody tried deep learning AI for keyboard input recognition ? something like the game Façade did https://youtu.be/RyaqHNdsqxw?t=151

YouTube

airikitascave

How to Actually Win Facade

This is how I won Facade, and it's rather annoying to get to this point... temptation to punch Grace in the face resisted... I had some alternate endings, su...

▶ Play video

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I would like to attempt this technique but not sure where to start

swift bolt Jul 20, 2019, 5:14 PM

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AI perception range works in a sphere right? Debug doesn't really show sphere z range.

hoary peak Jul 20, 2019, 7:01 PM

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What would a good solution to only make one AI in a behavior tree do a task? use a synced blackboard bool key?

pine steeple Jul 20, 2019, 7:15 PM

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@swift bolt it works in a sphere, but with a cone based on the angle set

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one ai to control many?

hoary peak Jul 20, 2019, 7:19 PM

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Did you ask me? I came up with a different solution

pine steeple Jul 20, 2019, 7:20 PM

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yeah

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was just trying to understand what you eman

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mean*

hoary peak Jul 20, 2019, 7:20 PM

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In hindsight just having 1 npc per BT wouldn't have worked either

pine steeple Jul 20, 2019, 7:20 PM

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normally you would control them by states, if that ai is not allowed to do something, then he should not go to that state

hoary peak Jul 20, 2019, 7:21 PM

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It was supposed to be a bool to determine if someone is allocating fuel to a building, but I put up a bool in the temperature component instead since each building has it's own

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Because having every AI bring fuel to a building could fuck up things pretty bad so I have to limit it to 1 at a time

pine steeple Jul 20, 2019, 7:27 PM

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use a token system

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each building has a token

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if fuel is incoming, one ai grabs the token, and fuels up, and returns the token once the fueling is done, and the cooldown is over

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this is what we do for our ai

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they grab a token from whatever player, and then only chase/attack them if there is a token available

hoary peak Jul 20, 2019, 7:36 PM

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I don't have that type of a game

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My AI is more building and profession bound

pine steeple Jul 20, 2019, 8:24 PM

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same principle could work for any game

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if a building is being occupied

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ie by fueling etc

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then apply some kinda tag to the building

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i would probably use Gameplay tags

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can be used on any Actor

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and you can mark buildings as being occupied and what is currently occupuing it

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or use some kinda Map of "Job/ActiveAI"

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and if that job has an active ai doing it, then don't allow other ai to do that job

thick surge Jul 21, 2019, 3:57 PM

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Hi guys I have to make a dialogue system and within the same ai the NPC would also have needs like hunger and then it would go to a certain spot on the map to fulfil his hunger. How would you guys approach having the 2 systems

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I was thinking on having Behaviour tree for both but that might be a bit too much

pine steeple Jul 21, 2019, 3:57 PM

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state based behaviour trees

thick surge Jul 21, 2019, 3:59 PM

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@pine steeple oh that's right because you can have parallel actions/ task on the behaviour tree right?

pine steeple Jul 21, 2019, 3:59 PM

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if hes hungry, run a Hungry behaviour tree

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you can run trees inside trees

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and run paralles if needed aswell

thick surge Jul 21, 2019, 4:14 PM

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@pine steeple how bad would it be in terms of performance ? I'm going to have around 24 NPCs

golden sage Jul 21, 2019, 4:59 PM

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Hey all, does someone know an easy way to interrupt a MoveTo-Task in Behavior Trees, so that u dont interrupt the Movement of the Character for a short amount of time. If u know simple tricks for interrupting the MoveTo-Task, im eager to know too.

pine steeple Jul 21, 2019, 5:17 PM

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its quite cheap tbh

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@golden sage not really, the default tasks abort velocity

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need to write your own task

vagrant summit Jul 21, 2019, 5:19 PM

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making your own move to task as UKaos said would be the only solution

golden sage Jul 21, 2019, 5:19 PM

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😱 😭

vagrant summit Jul 21, 2019, 5:19 PM

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Its not that hard tbh

golden sage Jul 21, 2019, 5:20 PM

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I just looked into the code of the MoveTo shortly, and it scared me away, but i need to buckle up it seems.

lyric flint Jul 21, 2019, 5:27 PM

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Ok so I raninto an issue, from out of nowhere, unpossessing my character stops the moveto task to work properly, the ai has the player targeted still adn it wasn't an issue last two days

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anyone got an idea what can be causing it? I've tried both the generic and custom omveto task, they all fail after target is unpossessed, and as I said this wasn't the case 2 hours ago

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Rotate to face character still works, sof If I move teh character by another actor (vehicle) the ai rotates, but it won't move to it still

golden sage Jul 21, 2019, 5:31 PM

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maybe u were testing with an old version in Editor? As far as i know u need a Controller for MoveTos to work. But im no sure

lyric flint Jul 21, 2019, 5:32 PM

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All in 4.22; I need a controller for the ai, not for the target, I need a actor or location for moveto and when I'm dewbugging the ai it hsows my player is sitll targeted by the ai-controller

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Also, this worked perfectly 2 hours ago, and has worked perfectly last 2 days

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Ok just tested, doesn't seem the the possession is the actual problem but as soon as I interact with it even when I removed unposses/posses nodes, can't think straight right now; if anyone has been in the same situation what was the actual source of problem?
I have check every BP i've edited and found no issues, it is the move to node that just won't work (I might be missing something but this is how it is percieved by me after 2 hours of trying to figure out why this happened)

golden sage Jul 21, 2019, 5:45 PM

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just for clarification, u have a Character1 that gots unposessed and a character2 that is supposed to walk to character1, but stops when u unpossess character1?

lyric flint Jul 21, 2019, 5:46 PM

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That is what I thought, but I rmeoved the unposses nodes and character2 won't go to character 1 still after I interact withthe vehicle

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Also, to clarify I did change recast and then this happened, but I set it back to the settings I had before and this didn't resolve, even after restarting the editor

golden sage Jul 21, 2019, 5:48 PM

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mmhh really dont know, sorry

lyric flint Jul 21, 2019, 5:49 PM

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yeah it's a weird one

patent hornet Jul 21, 2019, 7:30 PM

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@golden sage im partial to using MoveToActor, then stopping is just a matter of teleporting the MoveTargetActor onto the Pawn

golden sage Jul 21, 2019, 9:29 PM

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Thx Zlo, i will Look into that tomorrow

stark zealot Jul 21, 2019, 9:56 PM

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What's an easy way to make a zombie enemy climb a wall? Should I make a custom traverse blueprint that when touched makes the zombie play the climb anim and then slowly raise him up?

orchid frigate Jul 22, 2019, 10:10 AM

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@stark zealot Depends on what is an easy way for you and what assets you have to realize this feature. Basically you can do it the way you mentioned but it will need a lot of tweaking to have it look great, but the best way, imo, is to use an animation with root motion (to enable changes in Z you will need to enable flying mode instead of walking mode) which already will solve the issue of changes in Z axis.

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To use Root motion for AI you cannot use "Move To" nodes but a good approach is to use "Find Path to Location Synchronously".

stark zealot Jul 22, 2019, 5:46 PM

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@orchid frigate Thanks I didn't even think about that. I'm using Mixamo climbing anims right now but then look pretty good to me.

orchid frigate Jul 22, 2019, 5:53 PM

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@stark zealot if you take a look into this months freebies in Epic Marketplace there is a BP System for climbing as well. May be a good start as well to learn the different approaches. :)

stark zealot Jul 22, 2019, 6:05 PM

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ok i'll check it out.

lyric flint Jul 23, 2019, 1:44 PM

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So I figured out why it happened but not a solution yet @golden sage It was because I was using attach to actor and the player must be teleported or maybe it reads the attached local position vector and therefor getting wrong reading? I am not use just yet but I am sure it is attach to actor that is causing it

golden sage Jul 23, 2019, 2:58 PM

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Probably attachTo and teleports dont go well together , good u found it

flint trail Jul 23, 2019, 4:18 PM

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@tardy scarab Just saw the announcement for AI stream (thanks!) and posted a few questions here https://forums.unrealengine.com/unreal-engine/events/1645246-unreal-engine-livestream-ai-state-of-the-union-july-25-live-from-hq?p=1645535#post1645535 .. Any chance those will be covered ?

Unreal Engine Forums

190725_AI.jpg

WHAT
The documentation team has been hard at work expanding and improving the documentation for AI. Wes Bunn will be in the studio to talk about

near jetty Jul 23, 2019, 4:39 PM

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HTN planner what the fk is that

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thats my question XD

tardy scarab Jul 23, 2019, 5:01 PM

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@flint trail I'll let Wes know and we'll do our best :)

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For the 6dof VR AI question: Look at VRExpansionPlugins VRAIController. It changes all of the stock functions to look at Camera instead of Actor

flint trail Jul 23, 2019, 5:12 PM

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yeah, but I was wondering if there was way to do that with stock UE4 without any modifications to the code or plugins @tardy scarab (and I am guessing there is none, which is odd since VR has been around for some time now)

tardy scarab Jul 23, 2019, 5:46 PM

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@flint trail Unfortunately not, but you don't need a custom engine version to inherit from AIController and Override the functions

quiet dove Jul 23, 2019, 6:28 PM

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What would be the simplest way to make a camera that can travel to locations and dodge scene objects to avoid clipping into them?

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Is it possible to use the Floating Pawn Movement without requiring a nav mesh?

hearty rock Jul 23, 2019, 9:05 PM

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@near jetty 🤤 I'd love to flesh out the HTN plugin and make it accessible on the tier BT's are .... I uh.. need a few lifetimes worth of that megagrant money first though lol

kind wigeon Jul 23, 2019, 9:15 PM

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How do I abort lower priority trees in a sequence? I only get the option to abort self or none.

azure cliff Jul 24, 2019, 9:04 AM

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Hey guys, why doesn't this work? It doesn't go past GetAttackDelay.

EDIT: Solved by using a simple parallel with main task being GetBurstCD and GetAttackDelay while MoveTo is subtree.

📎 unknown.png

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@kind wigeon I can though? Do you mean tasks with decorator? I think once you abort, it will cancel the sequence?

golden sage Jul 24, 2019, 12:18 PM

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@kind wigeon "Both" and "Lower peiority" will be available if you change sequince composite node to selector after the root node.
https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/73782-problem-on-behavior-tree-observer-abort-both-option

Unreal Engine Forums

Build powerful visual scripts without code.

kind wigeon Jul 24, 2019, 7:13 PM

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Is there no way to do that with a Sequence? I can't figure out how to accomplish what I'm doing with a Selector. I have a BT where the AI follows a path, and I want to abort the path-following if a Blackboard value is changed to set a new path, then make it follow the new path.

patent hornet Jul 24, 2019, 7:18 PM

#

you can do it with a SimpleParallel

#

just watch out not to get stuck in it, because its easier then with other flow control nodes to do so

#

MainTask would just return FinishExecute true when you actually get there\

#

while the parallel would have a MoveTo task with an Abort decorator and will restart itself if aborted

#

or

#

you could MoveToActor instead of MoveToLocation

#

then you wouldn't need to restart the MoveTo task, just teleport the MoveTargetActor

#

@kind wigeon

#

it also works better out of the box, because it doesn't glitch Characters out of their movement animation for a frame when the task is restarted

kind wigeon Jul 24, 2019, 7:30 PM

#

With the SimpleParallel, how would I handle aborting the move when the state variable changes?

patent hornet Jul 24, 2019, 7:35 PM

#

its an entire subtree for a parallel task

#

so the same way you do it anywhere else

golden sage Jul 25, 2019, 9:13 AM

#

Hi guys, does anybody know how BTTask_MoveTo works? I am currently trying to write my own MoveTo, but i am a bit confused. For Example in the .cpp in the Execute function.

MyMemory->bWaitingForPath = bUseGameplayTasks ? false : MyController->ShouldPostponePathUpdates();
if (!MyMemory->bWaitingForPath)
{
    NodeResult = PerformMoveTask(OwnerComp, NodeMemory);

}

bWatingForPath needs to be false, so the PerfromMoveTask can be done. But what have GameplayTasks to do with that? I read in the Forums, GameplayTask are shipped since 4.13, but often u read in the SourceCode the following:

/** this property is just a transition-time flag - in the end we're going to switch over to Gameplay Tasks anyway, that's the goal. */
UPROPERTY(globalconfig, EditDefaultsOnly, Category = "Gameplay Tasks")
bool bEnableBTAITasks;

In the constructor of BTTask_MoveTo bEnableBTAITasks is used to set bUseGameplayTasks like this.

bUseGameplayTasks = GET_AI_CONFIG_VAR(bEnableBTAITasks);

Do u know what this does and why they need transition-stuff, when GameplayTasks are out for a long time now?
Also when does MyController->ShouldPostponePathUpdates() get Set in Code. Obviously the MoveToTask only gets executed if bUseGameplayTasks and ShouldPostponePathUpdates are false.
Hope this all makes sense, i am just confused and try to understand how everything works together.

fiery sorrel Jul 25, 2019, 2:58 PM

#

MyMemory->bWaitingForPath = bUseGameplayTasks ? false : MyController->ShouldPostponePathUpdates();
if (!MyMemory->bWaitingForPath)
{
    NodeResult = PerformMoveTask(OwnerComp, NodeMemory);
}

/** this property is just a transition-time flag - in the end we're going to switch over to Gameplay Tasks anyway, that's the goal. */
UPROPERTY(globalconfig, EditDefaultsOnly, Category = "Gameplay Tasks")
bool bEnableBTAITasks;

//In the constructor of BTTask_MoveTo bEnableBTAITasks is used to set bUseGameplayTasks like this.

bUseGameplayTasks = GET_AI_CONFIG_VAR(bEnableBTAITasks);

sturdy zodiac Jul 25, 2019, 3:34 PM

#

I'm wondering how are BT Tasks instancing. I've found out that they instance per node in BT (like if I create two nodes with some variable, they'll keep their own variable values after finishing on continuous execute). But what about another AI instances? Do tasks have different instances per different AI Controllers or not?

golden sage Jul 25, 2019, 5:37 PM

#

@fiery sorrel thx, i just found out how to do it. Dont know why i didnt bother me in the first time 🙄

#

@sturdy zodiac i read about the same topic the last days and as i understand it, Ai instances will be put on different AiControllers. Sometimes u want an instance of every Node that is created from ur customNode.
https://answers.unrealengine.com/questions/173494/bttask-nodememory.html

#

Does anyone know why bObserveBlackboardValue from BTTask_MoveTo is not exposed to BP-BTs? Such a useful thing.

    /** if move goal in BB changes the move will be redirected to new location */
    UPROPERTY()
    uint32 bObserveBlackboardValue : 1;

spiral shuttle Jul 25, 2019, 5:59 PM

#

AI stream starting soon

#

https://www.twitch.tv/unrealengine

Twitch

UnrealEngine - Twitch

Unreal Engine - AI: State of Mind

▶ Play video

languid salmon Jul 26, 2019, 10:50 AM

#

Is there a way to get an AI to move in an arc while still using the navmesh ?

sturdy zodiac Jul 26, 2019, 11:51 AM

#

@languid salmon You'll have to write custom Move To, or make the visual mesh only move up-down while the whole actor moves like it is supposed to. I'd suggest to create CurveAsset and use it as height param during movement

willow arch Jul 26, 2019, 12:49 PM

#

do composite nodes also check its other decorators after being looped by a conditional decorator?

waxen rain Jul 26, 2019, 3:02 PM

#

How can I use a nav mesh to determine if there's a way in or out of a room?

languid salmon Jul 26, 2019, 3:33 PM

#

Aaah thanks - Guess I need to write my own Move To, seperating the mesh from the capsule would probably be less desired in my case.

zinc verge Jul 26, 2019, 3:57 PM

#

first you git a definition to out and in

#

then you pathfind between out and in

#

😛

lyric flint Jul 26, 2019, 8:05 PM

#

I need some insight or help.

When Move To Arena aborts, it aborts the entire Round Start sequence. I want the Round Start sequence to continue on to the SetMoveSpeed task when Move To Arena aborts. But this isn't happening because of what I just explained.

This only works as intended when I change Move To Arena to abort none instead of self. This is confusing because setting it to abort self shouldn't also abort the parent sequence node, unless i am mistaken.

📎 unknown.png

lyric flint Jul 26, 2019, 9:42 PM

#

anyone had the isseu with ai moveto only working for target actors and very inconsitently for target location?

#

@lyric flint Becasueyou are using a sequence, a sequence stops when a sub-tree stops

#

and the sequence returns a fail, so teh composite nodes have impliocit rules we can say, these rules are detailed when you hover your mouse over each composite node, (Sequence, Selector, Simple-parallell)

#

Thank you!

pine steeple Jul 26, 2019, 9:51 PM

#

Sequence will continue until a node fails or it finishes the sequence

#

selector will run its nodes till it succeeds/finishes

#

Simple Parrallel will execute its main task, whilst running a sub tree and will finish with the main task

lyric flint Jul 26, 2019, 9:52 PM

#

Const, have you run into inconsitency issues with teh ai moveto as I described above btw?

pine steeple Jul 26, 2019, 9:52 PM

#

what you mean?

#

i never use Target Locations for my ai, due to the decelerating and one frame issues when moving between moveto tasks

lyric flint Jul 26, 2019, 9:53 PM

#

My custom and teh native AI-moveto tasks are working when targeting an actor consitently, but when the target is a location it only worka about 1/10 of the times

pine steeple Jul 26, 2019, 9:53 PM

#

i always use Goal Actors

#

my ai teleport an actor around

#

and chase it

#

😄

#

benefit with that is, i have dogs, which can circle a player, so i can attach the actor to the player, and run a eqs query to make the dogs circle 😄

#

move to location failing, i never really had it fail, just don't ever use. but when i have used it, i never had issues with it not working

lyric flint Jul 26, 2019, 9:54 PM

#

Aha that was a good diea, having an actor like that

#

will try it

crystal willow Jul 27, 2019, 4:04 AM

#

How do I get my AI to spread out more? (instead of walking in a straight line)

limber tiger Jul 27, 2019, 5:02 AM

#

Depends how you're ordering them to move. There is a node about getting a random reachable location on navigable radius which would give the AI altered destination positions within constraints

fallow hound Jul 27, 2019, 12:49 PM

#

There's is also recast crowd manager, or something like that, I've heard it is expensive though

lyric flint Jul 27, 2019, 1:29 PM

#

@pine steeple It worked using an actor, but I am facing some issues regarding teh focus point of the aictronller, I set it to focus on teh target, adn it doew, but like every movement update it seems to shift it's orientation towards it's movement goal, so it looks like an insane stutter unti lit has reached it's goal

desert cipher Jul 27, 2019, 1:55 PM

#

It's been quite a while since i set up any AI. So I'm trying to port over a simple search for points and patrol setup from another project. The only difference in this case is that I have some actors in the scene (children of target points) that I want to use as my points rather than just random points from EQS. I noticed that the EQS node has an option to get a list of actors of class in a radius so that seems to be what I want. The only issue I noticed is that the my "Findnextwaypoint" value on my blackboard is invalid, and I notice that on my old setup. Can anyone jog my memory on what I need to set for this?

#

📎 oldai.png

#

📎 oldai2.png

#

I can't recall where it is I set that parameter.

lyric flint Jul 27, 2019, 2:13 PM

#

Have you looked into the EQS task? @desert cipher

desert cipher Jul 27, 2019, 2:13 PM

#

I have

#

I've compared them both and they're the same

#

I set up that one like a year ago..and I have vague memories of the trace.bool but I can't for the life of me remember where that got set.

#

right now it looks like the EQS search I'm doing is just constantly failing

#

📎 oldai3.png

lyric flint Jul 27, 2019, 2:16 PM

#

📎 unknown.png

#

Set it in teh details panel

#

should show up in the BT node afterwards

desert cipher Jul 27, 2019, 2:19 PM

#

let me try that

lyric flint Jul 27, 2019, 2:20 PM

#

make sure your trace has it

desert cipher Jul 27, 2019, 2:21 PM

#

Hmm. Okay I see that trace.bool in the trace now...but it's not showing up in the query

#

but when I create a new query config, it's still "none"

📎 oldai4.png

#

ah.. i had to uncheck the 'query template' box and check it again

#

sadly still returning an invalid point

desert cipher Jul 27, 2019, 3:13 PM

#

I got a point and a vector..but the unit refuses to move to one

📎 oldai5.png

lyric flint Jul 27, 2019, 3:17 PM

#

Yeah, I'm not sure why but I have had a tonne of issues getting the ai to follow location targets, following actor targets have been easy as pie but not location target

desert cipher Jul 27, 2019, 3:21 PM

#

📎 oldai6.png

#

This one has scores, but still not moving

#

my previous game did have them moving to vector points

#

I'm basically just getting the vector from the target point. Should I just have them "move to" the target point actor?

#

that didn't work either.. they have an AI controller one is a pawn, with a floating movement component, the other other is a character with a CMC

#

I was just testing both, neither move

#

omg..

#

I had checked my navmesh earlier and it was green

#

I never touched it but at some point it must have gone weird

#

and needed to be moved to be regenerated

#

banging my h ead for 30 minutes

pine steeple Jul 27, 2019, 4:41 PM

#

@desert cipher tried using the eqs testing pawns?

#

they are handy for debugging issues

royal kettle Jul 27, 2019, 4:45 PM

#

Hi
AI character not moving after open level from main menu!! please help

waxen rain Jul 27, 2019, 10:23 PM

#

Does anyone know how I could use an ai or nav mesh to detect if there's a way in or out of a room?

desert cipher Jul 27, 2019, 11:01 PM

#

@pine steeple it's working now. Something happened to my navmesh I had checked it like 20 minutes earlier and it was fine green everywhere. But when with I checked it then nothing. Not sure why. I didn't touch it in between

lavish lotus Jul 28, 2019, 11:05 AM

#

Anyone know how I could train an AI/ BT?

lavish lotus Jul 28, 2019, 6:04 PM

#

ah nvm I found tensor flow ue4 plugin which probably will help

lavish lotus Jul 29, 2019, 12:21 PM

#

I think I'll use Qlearning and weight different things happening to reward / deny inside a behavior tree

#

https://github.com/getnamo/tensorflow-ue4-examples/tree/qlearn

GitHub

getnamo/tensorflow-ue4-examples

Drag and drop Unreal Engine TensorFlow examples repository - getnamo/tensorflow-ue4-examples

digital forum Jul 29, 2019, 1:44 PM

#

How well supported is streaming in navmeshes from sublevels

#

Can so navigate between sublevels this way or are they confined

fallow hound Jul 29, 2019, 3:08 PM

#

You might need to turn on dynamic navmeshes in project settings

digital forum Jul 29, 2019, 3:17 PM

#

well ideally it'd use hiararchical pathfinding

lyric flint Jul 29, 2019, 5:12 PM

#

So, anyone else found issues when targets attach them selves to other actors? Currently as I attach a target actor A to another actor B, the AI that is targeting actor A stops generating paths, but stays stationary and performs ranged skills only

patent hornet Jul 29, 2019, 5:16 PM

#

is actor B affecting navmesh?

lyric flint Jul 29, 2019, 5:16 PM

#

Hmm, Itmight be, let me check

#

Can affect navigation is not ticked

#

sry got a phonecall while I was checking, back again

slow bobcat Jul 30, 2019, 7:11 AM

#

@waxen rain
Maybe you can do something like they did in Splinter Cell (chapter 28.3)
http://www.gameaipro.com/GameAIPro2/GameAIPro2_Chapter28_Modeling_Perception_and_Awareness_in_Tom_Clancy's_Splinter_Cell_Blacklist.pdf

azure cliff Jul 30, 2019, 10:14 AM

#

Hey guys, any tips on working on AIs surrounding player randomly?

azure cliff Jul 30, 2019, 11:00 AM

#

Here's my current AI surrounding player. Somehow it's only surrounding one side most of the time..

📎 asdasd.gif

slow bobcat Jul 30, 2019, 11:41 AM

#

I would use eqs and check where and why are they choosing said points.

There's a very good way to do that where, instead of letting the npc's choose the location, there's an invisible set of points around the player and a manager assigns the points when an npc requests a "surrounding point". That way you can also manage npc's that take 2 slots instead of one (maybe they are bigger or their weapon needs more space). You can do things like "a big npc can knock out friendly AI to make space" (the manager will say "you take this 2 slots and they are occupied, so clear them out") and so on.
It's faster because instead of many npc's asking for points, checking for space etc, you have a predefined solution that controls all that and skips already occupied locations.

If you feel like the slots are easy to see (as in: the player ends up "seeing" all the possible npc slots after playing for a while) you can just scramble them in your manager or rotate them a little.

azure cliff Jul 30, 2019, 11:49 AM

#

@slow bobcat I see what you mean. That's a pretty good way to do it. I will check eqs out and work on this method.

#

Thanks for the advice!

slow bobcat Jul 30, 2019, 11:52 AM

#

no worries.
Another cool thing is that the slots manager system allows you to easily implement enemies that want to stay in the back of the player. The can move with the slot when the player turns around and stuff like that

azure cliff Jul 30, 2019, 11:56 AM

#

I have an area system whereby AIs are controlled by it. The area system command AIs to attack one by one by their own delay. Do you think i should add the slot manager system into this system instead of it on the player?

#

Will it work? The area system is to prevent AIs from moving out of the area as well though it's not implemented yet. Similar to how dragonnest's AIs are trapped in an area.

slow bobcat Jul 30, 2019, 12:09 PM

#

it depends on how you want to handle your code really.
To me controlling the area of attack and granting attack slots sounds good within your Attack Manager, War Director or whatever you call it.

#

as a side advice, looking at the gif you posted, I would recommend you look into how to use Visual Logger. It's going to simplify your debug process a lot

azure cliff Jul 30, 2019, 12:24 PM

#

Thanks for the advice! I will look into it.

sturdy zodiac Jul 31, 2019, 8:13 AM

#

Hey. Have anyone succeed in dynamic avoidance with DonAi Navigation?

fallow hound Jul 31, 2019, 9:51 AM

#

Just gave my AI perception components... and they are reporting they can see eachother. But I never gave them stimuli source components? Are pawns stim sources by default?

pine steeple Jul 31, 2019, 3:21 PM

#

yes think so

#

remember seeing a config option

#

to register all sources

#

but 🤷 cant remember where now

west thunder Aug 1, 2019, 1:40 AM

#

Anyone know why the service in this branch doesn't trigger? The Task under will trigger, but I'm trying to get the pawn to rotate to face it's target. I initially had the Service attacked to the top Selector, leading into the Task - Didn't trigger (using breakpoints). I then attached it to the Task itself, still wouldn't trigger.

📎 unknown.png

west thunder Aug 1, 2019, 2:02 AM

#

It works here

📎 unknown.png

#

But not here... The branch will trigger, but the AI won't rotate, the service gets ignored if it isn't directly below the BT Root...

📎 unknown.png

#

Eh, found a work around by changing the logic inside the Face Target so it works just below the BT Root, but still doesn't make sense why it won't work anywhere else.

azure cliff Aug 1, 2019, 10:41 AM

#

@west thunder i dont think condition will stack? Try to use composite

lavish lotus Aug 1, 2019, 11:48 AM

#

Running an EQS stops my execution

#

why?

thick surge Aug 1, 2019, 9:36 PM

#

hey guys is there something I can have on top of the behaviour tree to run all the ai interactions like an AI manager, or a game state ai ?

thick surge Aug 1, 2019, 10:43 PM

#

hey guys I made a post in the forums and I would love to hear your opinion on the topic 😃 https://forums.unrealengine.com/development-discussion/c-gameplay-programming/1648868-social-ai-behavior-in-games-why-are-they-so-few-of-them-and-are-they-a-possibility-in-ue4

Unreal Engine Forums

Just a heads up before I start with the topic at hand, I'm not a programmer, far from it, so take everything with a grain of salt.

Ok, so what is this all about?

azure cliff Aug 2, 2019, 6:05 AM

#

@inland smelt EQS has overlap test which can be used to trace whether objects is overlapping it. EQS can return actor or location.

#

@thick surge In my opinion, it requires alot of checks for answer to responds. Without choices, user can just type any words for the answer. You could return saying that it's not a valid answer but wouldn't this feel similar to selective choices in various games and bots in website.

lyric flint Aug 2, 2019, 11:49 AM

#

Hello Anyone knows if the gameplay debugger can be used in the client build which is connected to a dedicated server ?

wraith estuary Aug 2, 2019, 12:42 PM

#

Can anyone help me a bit with ai issues. I'm making a zombie shooter game where the zombies use the "ai move to" function to move to the player. On occasion, the zombies will get stuck on objects they attempt to go around. The zombies will also often get stuck on each other at the mouth of a hallway or tunnel. How do I make it so that the zombies don't get stuck on each other ?

keen furnace Aug 2, 2019, 2:16 PM

#

Use detour or rvo to stop them getting stuck on each other, increase a the nav agent radius to help with corners @wraith estuary

wraith estuary Aug 2, 2019, 4:14 PM

#

Ok I have already tried nav agent radius in the past I will look up how to do the detour and rvo

wraith estuary Aug 2, 2019, 4:43 PM

#

@keen furnace does detour/rvo require knowledge of blackboarding and such or is it just in blueprints or the character movement?

keen furnace Aug 2, 2019, 4:43 PM

#

rvo is in character movement

#

for detour, reparent your AIController to DetourAIController

#

dont use both

#

pros cons to each

wraith estuary Aug 2, 2019, 4:44 PM

#

Ok

keen furnace Aug 2, 2019, 4:44 PM

#

rvo is cheaper but dumb

#

detour is expensive but clever

wraith estuary Aug 2, 2019, 4:44 PM

#

I will try detour

fiery sorrel Aug 2, 2019, 4:45 PM

#

@wraith estuary I'd look into flocking and obstical avoidance. Not use the built in crowd or rvo

https://gamedevelopment.tutsplus.com/tutorials/3-simple-rules-of-flocking-behaviors-alignment-cohesion-and-separation--gamedev-3444

Game Development Envato Tuts+

3 Simple Rules of Flocking Behaviors: Alignment, Cohesion, and Sep...

In the natural world, organisms exhibit certain behaviors when traveling in groups. This phenomenon, also known as flocking, occurs at both microscopic scales (bacteria) and macroscopic scales...

#

scales better with higher nubers of enemies

wraith estuary Aug 2, 2019, 4:45 PM

#

Don't character classes already have a built in controller or something?

keen furnace Aug 2, 2019, 4:45 PM

#

i dont think he wants to code it 😉

fiery sorrel Aug 2, 2019, 4:45 PM

#

ahh

keen furnace Aug 2, 2019, 4:45 PM

#

yeah dont worry

wraith estuary Aug 2, 2019, 4:45 PM

#

Cause I don't have a controller class for my zombie

keen furnace Aug 2, 2019, 4:45 PM

#

you will need to make one

wraith estuary Aug 2, 2019, 4:45 PM

#

Ye I'm lazy haha

#

Ok

keen furnace Aug 2, 2019, 4:45 PM

#

and set that as default in class settings

fiery sorrel Aug 2, 2019, 4:45 PM

#

any ai will have a controller

keen furnace Aug 2, 2019, 4:45 PM

#

make it inheric from detouraic

wraith estuary Aug 2, 2019, 4:45 PM

#

I don't have much experience with controllers

fiery sorrel Aug 2, 2019, 4:46 PM

#

shoulkd*

keen furnace Aug 2, 2019, 4:46 PM

#

yeah but its just the default one

#

by default character class is set to spawn aic if placed i believe

wraith estuary Aug 2, 2019, 4:46 PM

#

Lemme get on my PC real quick

keen furnace Aug 2, 2019, 4:46 PM

#

but its just an aic, not a detouraic

wraith estuary Aug 2, 2019, 4:47 PM

#

Ok so I just make a new class that is the child of the detour class

keen furnace Aug 2, 2019, 4:47 PM

#

yes

#

then open your character

#

and Class Defaults

#

set its aic there

#

and make sure its ticked to spawn it if spawned and if placed

wraith estuary Aug 2, 2019, 4:48 PM

#

ok so i can set the controller class in the zombie's defaults

keen furnace Aug 2, 2019, 4:48 PM

#

yes

wraith estuary Aug 2, 2019, 4:48 PM

#

yea ill make sure i check that

keen furnace Aug 2, 2019, 4:48 PM

#

and tick the boxes to spawn the aic if placed AND if spawned

wraith estuary Aug 2, 2019, 4:48 PM

#

cause i spawn the zombies

keen furnace Aug 2, 2019, 4:48 PM

#

yes

#

then theyll start avoiding each other

#

this isnt free

#

so if you want a ton of ai youre gna have to think about things

#

but its quick and looks nice

#

it wont stop them getting stuck on geo tho

#

for that you need to adjust the agent radius

wraith estuary Aug 2, 2019, 4:50 PM

#

I may have to disable rvo

keen furnace Aug 2, 2019, 4:50 PM

#

yes do disable rvo

wraith estuary Aug 2, 2019, 4:50 PM

#

Ok disabled it

keen furnace Aug 2, 2019, 4:50 PM

#

one or the other

#

also rvo gets things stuck

wraith estuary Aug 2, 2019, 4:50 PM

#

Is 200 a good agent radius

keen furnace Aug 2, 2019, 4:50 PM

#

ai can get shoved off navmesh

#

i cant answer that

#

try it

#

see if it works better in your case

wraith estuary Aug 2, 2019, 4:51 PM

#

Ok

#

📎 unknown.png

#

the zombies are not pointing towards the player

#

but they are moving

fiery sorrel Aug 2, 2019, 4:52 PM

#

on the Character, the movement component

#

Enable Orient to movement

#

should help that

#

📎 unknown.png

#

also make sure that this is off

wraith estuary Aug 2, 2019, 4:53 PM

#

Ok

fiery sorrel Aug 2, 2019, 4:53 PM

#

📎 unknown.png

wraith estuary Aug 2, 2019, 4:55 PM

#

Ty for all the help you guys!

#

It works

tawdry gorge Aug 2, 2019, 7:11 PM

#

can someone help me with AI?

tawdry gorge Aug 2, 2019, 8:11 PM

#

got a problem with following character

livid beacon Aug 3, 2019, 4:46 AM

#

I'm making a traditional RPG, which is top-down and in which the player controls the actions of characters in the party, but in which those party members will act automatically when there is no instruction from the player. I had originally had set it up such that the player character was controlled by the player controller, and the party members were controlled by AI controllers but took direction from the player controller. I am now realizing that's probably not the best way to do it. I am getting ready to re-write all of this such that each character (including the main character that the player identifies with) is controlled by an AI controller, but that the player controller can give directions to the AI controller for any party member. I think this makes sense, but I don't want to invest a lot of time only to realize that there is a better way. Am I going down the wrong path?

#

I'm looking at this video as an example. This is an RTS game, but it seems like a traditional party-based RPG with a pause-based combat system would work well when organized like an RTS. https://www.youtube.com/watch?v=1Dm1G6fUuFs

YouTube

Unreal Engine

Hero AI – Gameplay Abilities Meet Behavior Trees | Unreal Fest E...

The Gameplay Ability System in Unreal Engine allows developers to build powerful abilities for arbitrary games. In this Unreal Fest Europe 2019 talk, Daedali...

▶ Play video

patent hornet Aug 3, 2019, 10:36 AM

#

@livid beacon yeah, the AIController for every party member + PC being able to "control" all of them (possibly possessing and directly controlling a CameraPawn) - its a good way to do it

misty holly Aug 3, 2019, 10:54 AM

#

im getting accessed none error on this but not sure why. Note I am storing it in my player character bp so I can call it later with a key input wich will allow me to set this on the behavior tree

📎 unknown.png

patent hornet Aug 3, 2019, 11:33 AM

#

you're getting none accessing what? BB? is that an AIController BP?

misty holly Aug 3, 2019, 2:28 PM

#

no I have it in the player bp I am trying to have the player set the blackboard key when the player presses the f key that way it will trigger the blackboard decorator which is checking if this boolean is set or not

📎 unknown.png

#

@patent hornet

patent hornet Aug 3, 2019, 2:52 PM

#

player doesn't have a BB component

#

AIController does

misty holly Aug 3, 2019, 3:23 PM

#

could I put it in the aicontroller then call the custom event fromn the aicontroller from the player character

livid beacon Aug 3, 2019, 3:28 PM

#

@patent hornet thx!

ornate shoal Aug 3, 2019, 3:46 PM

#

Not saying anything productive, but hot damn is Behavior Tree authoring a mess when you dont know what you're doing. Nested if statements everywhere.

fallow hound Aug 3, 2019, 10:25 PM

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Kind of a high level question: Should my controller class simply set blackboard values (monitor perceptions, update bb values), while blackboard does all behavior and logic?

ornate shoal Aug 4, 2019, 12:20 AM

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In the video I've been following Ian Shadden seems to have Tasks that are setting the blackboard values as part of the Behavior Tree, and I have been following suit.
Haven't heard or seen any indication that there's anything wrong with doing it that way.

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@fallow hound

fallow hound Aug 4, 2019, 12:22 AM

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ahhh good to know, thanks

trim cape Aug 4, 2019, 1:24 AM

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Currently I'm learning how to set up a simple AI enemy character. I have a very simple BT set up but I'm receiving some behavior I don't like

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https://gyazo.com/e45a563880634a8a7b104499f10cb9a3

Gyazo

▶ Play video

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https://prnt.sc/oo19r0

Lightshot

Screenshot

Captured with Lightshot

#

It seems the characters aren't facing the location they're moving too and I was wondering how to fix this

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I tried checking the orient to movement setting but that didn't have any effect

misty holly Aug 4, 2019, 3:08 AM

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

YouTube

Mathew Wadstein

WTF Is? AI: Rotate To Face Task Node in Unreal Engine 4 ( UE4 )

What is the Rotate To Face BBEntry Task Node in the Behavior Tree in Unreal Engine 4 Source Files: https://github.com/MWadstein/wtf-hdi-files

▶ Play video

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maybe this is what youre looking for @trim cape

worn crescent Aug 4, 2019, 7:45 AM

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https://answers.unrealengine.com/questions/913823/custom-navlinks-with-detour-crowd-manager.html this is why I am awake right now XD

orchid frigate Aug 4, 2019, 10:02 AM

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@misty holly maybe a little late to respond, but imo the cleanest solution is to set the BB Value in a Task.
If you want to do it within the player why not creating a Function Library which calls the AI Controller so u can change the BB value of tje Ai Controllet within the player.

spiral shuttle Aug 4, 2019, 10:26 AM

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where would one draw the line between using a service or a task for e.g. finding & setting a target on the BB?

digital forum Aug 4, 2019, 11:25 AM

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services run continually while the node is active

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task runs once

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you can attach arbitrary services to whatever nodes you want too

trim cape Aug 4, 2019, 12:31 PM

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@misty holly Thanks, I'll check it out

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I was asleep when you sent that so apologies for being late to responmd

hoary peak Aug 4, 2019, 7:06 PM

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How can I make a service run everytime a sequence is done?

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Search start seems to do just that

misty holly Aug 4, 2019, 7:52 PM

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@orchid frigate Thank you I didnt know about the function library I'll start using that for a lot of things now 😃

inland smelt Aug 5, 2019, 1:52 PM

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@hoary peak you can put that service at the end of that sequence so Everytime the sequence runs,the service too runs

prime echo Aug 5, 2019, 3:09 PM

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hi, how can I juste simply "send" input to pwan from AI ? I didn't found any example on this

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like I want the pawn (character) to go left ....

inland smelt Aug 5, 2019, 3:59 PM

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You send it in an variable @prime echo

prime echo Aug 5, 2019, 3:59 PM

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I don't get it

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player controller seems to propagate input ... but no diea how to simulate that from AIController in fact

prime echo Aug 5, 2019, 4:40 PM

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@inland smelt witch variable ?

pine steeple Aug 5, 2019, 11:52 PM

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ai should be controlled by orders

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like move to this location etc

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not by inpuit

night relic Aug 6, 2019, 9:52 PM

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Can someone explain why it isn't moving to the next sequence?

📎 Untitled-1.jpg

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fucking hate bt

livid beacon Aug 6, 2019, 10:27 PM

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I think this may be your answer: A sequence node will only move to the next node if the current node successfully completes. If the current node fails, the sequence ends. This is different than a selector node, which moves onto the next node if the current node fails, and continues moving to the next node until one succeeds (and then it stops). Here, your sequence node begins with a conditional loop node, which shows that it is failing. Since it is failing, the sequence stops. If you want to move to the BlackboardBasedCondition node when the ConditionalLoop fails, change your sequence node to a selector node.

night relic Aug 6, 2019, 10:51 PM

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I get the same result with a selector

night relic Aug 6, 2019, 11:08 PM

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I may be a shitty programmer, but UE4 BT are broken as fuck

misty holly Aug 7, 2019, 12:11 AM

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@night relic I think it may be your loop causing the issue

livid beacon Aug 7, 2019, 1:08 AM

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Psycho, which sequence did you change to a selector? The one right below the ConditionalLoop decorator, or the one above that feeds into the decorator?

night relic Aug 7, 2019, 1:22 AM

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both

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anyways, this was working before

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I don't see why a sequence wouldn't work

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mmm nvm I think I now understand how it works

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the sequence is aborted when a child fail, the remaining nodes are ignored

prime echo Aug 7, 2019, 9:27 AM

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hi, can I simply simulate input from a AIController ?

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or AIController only use BTrees at the end ?

unborn jungle Aug 7, 2019, 11:43 AM

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Anyone know the difference between GetRandomPointInNavigableRadius vs GetRandomPointInReachableRadius ?

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As far as I can see the Navigable one works correctly even when your character is in the air (for example enemies moving closer to you will continue moving even if you in the air, wheras if using the Reachable version, they will stop in their tracks if you jump and leave the navmesh)

patent hornet Aug 7, 2019, 2:19 PM

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AIController can use whatever it wants, but its not meant to handle input

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that is why the AI at the start

lyric flint Aug 7, 2019, 3:23 PM

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I have two targets standing on the same height,, ai can target both seperately but only generate paths to the first one, anyone stumbled upon this?

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I'm thinking the path target is out of bounds, but it hsouldn't be because both targets are next to eachother

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@unborn jungle From your description I would say GetRandomPointInReachableRadius ignores what your current movement mode is and GetRandomPointInNavigableRadius depends on your movement mode, not sure though I've only used GetRandomPointInNavigableRadius

orchid frigate Aug 7, 2019, 3:56 PM

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@unborn jungle
Navigable points are all locations which are not interfered by navigation.
reachable would be all points in the nav mesh even tho its overlapped already

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So if you have already 10 cubes and the nav mesh is just covering the grounf and u want to spawn an ai on a random reachable point it can spawn on the cubes. with navigable it will spawn around or at another free location

prime echo Aug 7, 2019, 4:49 PM

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@patent hornet so to simulate, "primitively' player' input I should rather create a class inheritates the pawn ?

unborn jungle Aug 7, 2019, 5:49 PM

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@orchid frigate Thank you very much!

vast relic Aug 7, 2019, 9:53 PM

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@prime echo Are you talking about making an AIController control a pawn just like how a player would?

lyric flint Aug 7, 2019, 10:30 PM

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anyone have any experience with porting bp decorators to c++? the picture takes 13ms of the servers game thread... 6.2ms from the GetBlackBoardValueAsActor .......

📎 unknown.png

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is there any documentation on this i cant find it, i cant seem to wrap my head around the premade nodes either 😢

vast relic Aug 8, 2019, 3:56 AM

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For making a base character to be the base class for ALL characters in your game, would you do input like this?

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📎 unknown.png

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Or would you handle input in the controllers and have them just call jump directly?

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Simple example but my main question is whether or not to have input on characters or not.

prime echo Aug 8, 2019, 5:26 AM

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@vast relic well I would like to use the same pawn I use for player, so I would like to do something like pawn->Set isLeftKeyPressed to True .... or sending it simulated input ....

prime echo Aug 8, 2019, 6:24 AM

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I understand I could use custom event do @vast relic

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the best would be the AIController "sending" space bar, but if I can do it via custom, let's try !

prime echo Aug 8, 2019, 6:43 AM

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Ok Work s!!!! I use SpawnActor instead of Spawn AIFrom Classand make it work transparently !!! good day start !!

patent hornet Aug 8, 2019, 7:12 AM

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@lyric flint if you are profiling that with the blueprint debugger running, that isn't really reliable

spiral shuttle Aug 8, 2019, 1:59 PM

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am i correct in my assumption that you need to use the CharacterMovementComponent for either RVO/DetourCrowd ?

wind cypress Aug 8, 2019, 2:14 PM

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yes I believe you are correct

patent hornet Aug 8, 2019, 2:50 PM

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its a subclass of PathfollowingComponent, i don't see why anyone would make a dependency on CMC there

spiral shuttle Aug 8, 2019, 4:27 PM

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@patent hornet what do you mean?

patent hornet Aug 8, 2019, 4:28 PM

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i never read the code, but designing detour to require CMC would be crazy

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from software architecture point of view

spiral shuttle Aug 8, 2019, 4:28 PM

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ah

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i looked into the cmc today and it does implement the avoidance interface

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and yes, that thing is so bloated

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tried to test detour yesterday and it didn't work at all with DetourAIController + pawn with pawn movement controller

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it was late so i didn't check too deeply whether i should switch out the pawn movement for a cmc

bright rune Aug 8, 2019, 5:44 PM

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Wondering what people use for avoidance ? I tested both RVO and DetourAIController(UCrowdFollowingComponent) and both have problems. RVO causes AI to push each other trough solid walls sometimes and Crowd doesn't seem to work at all if you have multiple navmeshes(multiple sized agents). Could dynamic obstacle be the answer? Propably too expensive or slow ?

bright rune Aug 8, 2019, 8:48 PM

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Does anyone have any idea how to fix RVO avoidance? My problem is that it simply doesn't respect collisions. Easily seen, if I go to corner of the map, let 10 enemies chase me, while they try to reach me and avoid each other, most of them get pushed through wall and drop of the map. If I make the walls thicker, they get stuck instead of pushed through. Walls have "block all" collision and I'm using behavior tree Move to. If I take off RVO avoidance, they never get pushed through walls.

bright rune Aug 8, 2019, 9:26 PM

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Seems like if I switch movement mode from "Navmesh walking" to just "walking", RVO avoidance works correctly and no longer pushes anything through solid objects! So my issue is fixed, cool.

patent hornet Aug 8, 2019, 10:32 PM

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it just became more expensive tho

pine steeple Aug 9, 2019, 4:48 AM

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oops delayed

bright rune Aug 9, 2019, 9:42 AM

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yes, it seems pretty expensive when I'm testing with lot of AI and using stat game. Movement component takes most of the power.. My prototype won't have that many AI tho.. so maybe its fine. Took a look at Crowd manager and it always uses the first nav agent's navmesh. Sadly my game is going to have very small enemies and big enemies, and I simply can't use just one agent. It's not too bad to make custom solution with EQS and short paths, but it's hard to make that work good when they are actually chasing player. I wonder what kind of system Fortnite Save the world uses?

wary ivy Aug 9, 2019, 2:09 PM

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you could try making some sort of movement component system that ticks all movement components in a sequence

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there was a great talk about this in GDC I think, sea of thieves dev gave it iirc

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or some other conference 🤔

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https://www.unrealengine.com/en-US/events/unreal-fest-europe-2019/aggregating-ticks-to-manage-scale-in-sea-of-thieves

Unreal Engine

Aggregating Ticks to Manage Scale in Sea of Thieves

This Unreal Fest Europe presentation by Rare's Senior Software Engineer Jon Holmes covers the techniques employed to efficiently manage the scale of Ticking Components and Actors within Sea of Thieves while also diving into a few real-world examples of how the team optimised ...

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that one, from unreal fest europe

warm ice Aug 10, 2019, 1:24 AM

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Is it possible to use items from one generation step as contexts for another generator step in a single EQS query?

#

📎 unknown.png

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Only the PathingGrid generator seems to generate items, the Donut generator doesn't work

near jetty Aug 10, 2019, 9:25 AM

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@bright rune do NOT use movement component if you will have more than a few characters. Its super slow

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make sure to have "overlap events" disabled

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and for your moving objects, also make sure they have the least amount of scene components as possible

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and yeah. Every time you have one "aggregate tick", thats about a 10-20% speedup compared to just normal unreal ticks

spiral shuttle Aug 10, 2019, 9:31 AM

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@near jetty you 're talking about the CMC, right?

bright rune Aug 10, 2019, 9:31 AM

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hmm, my game is 4 player co-op. Does this mean I should roll my own movement component for AI? It's not going to have huge numbers of AI, but tested with 2 players and about 30 AI and that CMC is doing some serious work on host machine.

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thats going to be a challenge with networking and making it smooth and good 😅

near jetty Aug 10, 2019, 9:40 AM

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@bright rune ive ran into issues with CmC on 15 characters

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on ps4

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you 100% do NOT want to use CmC for anything that isnt players

spiral shuttle Aug 10, 2019, 9:43 AM

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write a fast, networked CMC replacement and sell it on the MP @near jetty

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nice passive income

near jetty Aug 10, 2019, 9:50 AM

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thats... actually a good idea

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iu could create a NPC character movement that doesnt have physics so complicated, and its optimized as fk

spiral shuttle Aug 10, 2019, 9:51 AM

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i'd buy it

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though smart pathing and/or avoidance would be important

hushed moat Aug 10, 2019, 10:06 AM

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is it possible to use more Nav Mesh for different ai`s like a Car nav and people nav?

near jetty Aug 10, 2019, 10:10 AM

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yes

bright rune Aug 10, 2019, 10:15 AM

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I wonder what ARK survival evolved uses for AI? If you are admin, you can spawn dinos and they are all called BP_Character_something. They can't be using CMC, right? Or maybe its heavily modified.

near jetty Aug 10, 2019, 11:03 AM

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they are

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its one of the main reasons Ark performs like shit

bright rune Aug 10, 2019, 11:19 AM

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lol

hoary peak Aug 10, 2019, 3:06 PM

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Why can't I access BlueprintPure functions form my AIController?

fallow hound Aug 10, 2019, 5:42 PM

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Is it casted to the right class?

final tree Aug 11, 2019, 12:28 AM

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has anyone successfully pooled characters?

trim cape Aug 11, 2019, 1:34 AM

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probably a simple problem

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but i have this behavior tree: http://prntscr.com/or3poo

Lightshot

Screenshot

Captured with Lightshot

#

but when the actor moves to the location it doesn't actually properly face the location, the rotation of the character is actually very wonky

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https://gyazo.com/8ca9f7b404a032d41edee63d88529131 this is what the movement looks like

Gyazo

▶ Play video

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I've tried to use RotateToFace but it hasn't changed anything

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Simple fix, my actor wasn't facing the same was as his rotation arrow component in the editor

azure cliff Aug 11, 2019, 5:22 AM

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@trim cape The rotating task will finish execute everytime it rotates by abit.

azure cliff Aug 11, 2019, 5:39 AM

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Here's what i did.

📎 unknown.png

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📎 unknown.png

torpid axle Aug 11, 2019, 6:01 AM

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new to AI... just thinking this through... I have a basic unit (not the player) and enemy mob. If I want the unit to attack the mob, I'm torn between two options. 1) Use a behavior tree task to get details from the unit, and then damage the mob. All implentation done in the BTTask... OR 2) Use a BTTask to trigger a custom event on the unit itself, and the unit does the damage and any other implementation.

azure cliff Aug 11, 2019, 8:14 AM

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@torpid axle I did the 2nd option. But it's kind of messy for me. D:

trim cape Aug 11, 2019, 12:49 PM

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@azure cliff Hey I'll be sure to read through that tonight after work

azure cliff Aug 11, 2019, 12:50 PM

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Instead of inserting the bool to finish execute, insert it to a branch.

inner rapids Aug 11, 2019, 1:43 PM

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I've got an attack montage with several melee attacks in it... I've got an OnDamage notify for each. I'd like to make the first 2 attacks have small attack damage, third attack have slightly more, and then the last attack in the montage to have higher amount... what's usually the best way to handle this? I thought I could just pass some information with the notification, but it doesn't seem to take args, suggestions?

fallow hound Aug 11, 2019, 2:05 PM

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you could have a notify for each

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or, when something recieves the notify, check how much time is left in the anim

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and do logic based on that

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but maybe there is a way to pass args through anims, I havent messed too much w/. that

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@inner rapids

inner rapids Aug 11, 2019, 2:13 PM

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Ah, so, instead of one generic "damage" notify, in my case, fire two light attack notify, one med attack notify, one heavy notify, and handle the different damage amounts from blueprint, yes?

fallow hound Aug 11, 2019, 2:21 PM

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yeah thatd work

rancid ore Aug 12, 2019, 1:37 AM

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My behavior tree is stuck at RotateToFaceBBEntry and it doesn't actually rotate, anyone know what the issue might be? I've already disabled the controller yaw input and deactivating the orient rotation to movement in the movement component doesn't change anything

patent hornet Aug 12, 2019, 1:38 AM

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the simplest way to do it is UseControlRotation + SetFocus

rancid ore Aug 12, 2019, 2:06 AM

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How would I lerp that rotation though?

#

nvm haha

fallow hound Aug 12, 2019, 2:21 PM

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How'd you lerp it? Rotation speed in character motion?

wary ivy Aug 12, 2019, 2:34 PM

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@near jetty yea I think a "lite" mp compatible character class would be a nice marketplace plugin

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I would've bought one already if there was one

flint trail Aug 12, 2019, 2:49 PM

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is it possible for AI to target player's camera instead of the controller ? (without C++ code)

spiral shuttle Aug 12, 2019, 3:32 PM

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@flint trail you can make your own services, decorators as BP and get the camera's location in those

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if you talk about movement, there's a MoveToLocation task iirc (though the actor should be fine too)

flint trail Aug 12, 2019, 3:41 PM

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ah, I see.. Thanks

rancid haven Aug 13, 2019, 11:24 AM

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Anyone know how I can visualise Line of Sight?

patent hornet Aug 13, 2019, 11:27 AM

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debug draw

rancid haven Aug 13, 2019, 11:28 AM

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Yep. Care to elaborate

#

I am googling to my hearts content

patent hornet Aug 13, 2019, 11:49 AM

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what... shape is your LOS?

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i don't know the complexity you require

#

visualizing LOS can be as simple as drawing a debug cone from the character's viewpoint

#

or as complex as throwing bunch of linetraces, creating a procedural mesh and setting some transparent material to it

fallow hound Aug 13, 2019, 3:32 PM

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If you're using perception component there is build in los viz

fiery sorrel Aug 13, 2019, 3:48 PM

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@patent hornet https://docs.unrealengine.com/en-US/Gameplay/Tools/GameplayDebugger/index.html

Gameplay Debugger

Tool that enables analyzing realtime gameplay data at runtime.

#

Helped me

neat parrot Aug 14, 2019, 12:39 AM

#

Hey anyone know how to get an NPC to get in a vehicle and drive it to a destination based on spline while player is in passenger? Can't find any thing except for how to get ai to possess pawn

#

Not asking for some one to do it for me just point me in the right direction

fluid harbor Aug 14, 2019, 1:48 AM

#

I've just done something similar: you can create you vehicle as a Character and use AddMovementInput to the direction where your car should go to. Direction you get from spline: (spline point at distance - your location).Normalize(). You can maintain your current distance or you can calculate it: https://answers.unrealengine.com/questions/153956/get-distance-along-spline-from-world-location.html

#

@neat parrot

#

or of cause you can do it the easiest way, but it might be too stiff: just do set actor location every tick, location you get from spline distance, distance you increment in tick.

neat parrot Aug 14, 2019, 3:39 AM

#

I see

#

I found an rts tutorial on how to get four ai to enter a car possess it drive to designated point and exit.. so I'm gonna follow that tut take notes and figure it out

slow bobcat Aug 14, 2019, 7:53 AM

#

is there a way to avoid normalization in EQS?
I'm doing a custom test that compares de distance from one enemy to all the players.
I have 3 tiers or ranges: close, mid and far. Depending in which range-distance the enemy is form a player, I apply a different score.
What I want is to keep that score so, once the EQS is finished, I can know how close to the closest player the enemy was (was it close, mid or far to the closest?).

but this doesn't work since, once the test is finished, the results are normalized.

Does anyone know if this is possible? I don't see a way to override void UEnvQueryTest::NormalizeItemScores(FEnvQueryInstance& QueryInstance)

patent hornet Aug 14, 2019, 8:01 AM

#

you can pull that distance check out of EQS

#

and just use its results when you do a query

slow bobcat Aug 14, 2019, 8:21 AM

#

ummm not sure if I follow.
I get a callback to a function when the EQS finishes (OnDistanceQueryFinished(TSharedPtr<FEnvQueryResult> Result)).
When you say use the results, do you mean that Result object?
If that's what you mean, it's what I'm trying to do, but all you can get there is the Items as actors (this would be the enemies) and the score assigned to them (normalized)

half sage Aug 14, 2019, 9:14 AM

#

How would you got to make an ai search for a seat in a public transportation vehicle? Example bus, the bus stops and then the ai enters and searches for a free seat. I already have the trigger for entering and searching a seat, but I can't get the nav mesh inside the bus to work. I am not able to attach a navmesh inside my blueprint and it also wont create one dynamically in the bus when it stops inside a navmesh since the walkway is too narrow (even when i turn down agent radius and cell size). Any ideas? Every tip is appreciated 😃

patent hornet Aug 14, 2019, 10:30 AM

#

@slow bobcat i mean compute the distance separately of EQS, before the query

#

and leave the results where EQS query can find them

#

that way you can use them later, and EQS doesn't have to do the work again

inner rapids Aug 14, 2019, 2:27 PM

#

Hello. How do I make AI try to avoid "things"? My game has short term (30s) damage volumes that are added at runtime. I want AI to avoid it if possible, but charge through if no routes around are available.

woven bobcat Aug 14, 2019, 3:09 PM

#

Is there nay tut i can follow to learn more bout ai other than ue4 official channel

#

Any*

#

Especially using the blackboard and that tree thing

fallow hound Aug 14, 2019, 3:44 PM

#

@woven bobcat check out zoombapup on youtube

woven bobcat Aug 14, 2019, 3:46 PM

#

Alright

#

Thanks man

#

Other than him

fallow hound Aug 14, 2019, 4:13 PM

#

@inner rapids look into nav modifiers, you might also need to activate dynamic nav mesh updates in project settings

spiral shuttle Aug 14, 2019, 4:13 PM

#

@inner rapids check out nav modifiers. your nav mesh needs to be dynamic or dynamic (with nav modifiers)

#

lol

fallow hound Aug 14, 2019, 4:13 PM

#

Wow haha

inner rapids Aug 14, 2019, 4:13 PM

#

I'm thinking I should research nav modifiers?

spiral shuttle Aug 14, 2019, 4:14 PM

#

seems like a good call 😛

fallow hound Aug 14, 2019, 4:14 PM

#

Eh don't trust those guys

inner rapids Aug 14, 2019, 4:14 PM

#

Can I get a third opinion? ;)

spiral shuttle Aug 14, 2019, 4:14 PM

#

remove nav mesh, use raycasts 😄

#

change direction to evade based on random number

#

😅

inner rapids Aug 14, 2019, 4:15 PM

#

https://xkcd.com/221/

xkcd: Random Number

spiral shuttle Aug 14, 2019, 4:15 PM

#

it is at least deterministic

storm zephyr Aug 14, 2019, 8:17 PM

#

hello, i'm trying to use a nav modifier component on a character to use it's capsule component as an obstacle area, but the navmesh doesnt seem to update when the character moves. i have the mesh generation using the dynamic option, anything else i need in order to update it?

inner rapids Aug 14, 2019, 8:24 PM

#

Full disclosure, I'm just starting to figure out how to use the nav mesh modifier (I actually just asked a question about it a few lines above)

#

I found this page while I was researching it, perhaps applicable? https://answers.unrealengine.com/questions/338360/is-it-possible-to-enable-nav-modifiers-on-dynamica.html

storm zephyr Aug 14, 2019, 8:36 PM

#

thanks, but the capsule component has that option turned on already

#

and apparentely i dont even need the nav modifier, that capsule itself can serve as that if i enable can ever affect navigation

#

but it's still not updating the navmesh

#

when the character is moving

viscid oasis Aug 14, 2019, 10:21 PM

#

Is there anything I could potentially be missing when using BT on AIController through a dedicated server?

#

The BT isactive, that's fine, but it's not performing any of the desired actions. The pawn is using a floatmovementcomponent.

ocean wren Aug 15, 2019, 7:04 AM

#

Don't expect any of the movement BT tasks to work if youre using floatmovementcomponent, like AI MoveTO etc.. those require the regular movement component

azure cliff Aug 15, 2019, 8:22 AM

#

Hey guys, do you think these AIs are okay? https://gph.is/g/Z58kyW3

Giphy

lilac lynx Aug 15, 2019, 9:32 AM

#

Hey! Does any one have experience with Clearnace based Pathfifning? I am confused on how to caclualte the Clearance Values .

fluid harbor Aug 15, 2019, 2:33 PM

#

@azure cliff would be better if "disabled" AI would keep moving around. Now they are just standing.

azure cliff Aug 15, 2019, 2:38 PM

#

@fluid harbor Do you mean chasing the player?

fluid harbor Aug 15, 2019, 2:43 PM

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no, not chasing, but browsing around. This idea I got from latest Doom. They have a combat manager that assigns attack cards to NPCs. All other NPCs that are around should not attack the player, but just browse around

#

like keeping distance from the player and not attacking. Otherwise you will get too many NPCs attacking a player at the same time

azure cliff Aug 15, 2019, 2:52 PM

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@fluid harbor Currently that's how the AIs are getting commands from system to attack. I think i will add those behaviors for those AIs that aren't attacking yet. The AIs are set to aggro to player when player enters the "arena".

fluid harbor Aug 15, 2019, 2:55 PM

#

🤜

fallow hound Aug 15, 2019, 3:58 PM

#

@fluid harbor where did you hear about this combat manager in doom? I'm curious to research it.

fluid harbor Aug 15, 2019, 3:59 PM

#

hm.... I read about it about a year ago. Let me see if I can find that article again

fallow hound Aug 15, 2019, 4:01 PM

#

Thanks!

fluid harbor Aug 15, 2019, 4:01 PM

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not exactly related, but this is a cool video about AI in DOOM: https://www.youtube.com/watch?v=3lO1q8mQrrg

YouTube

GDC

Bringing Hell to Life: AI and Full Body Animation in DOOM

In this GDC 2017 talk, id Software's Jake Campbell explains some of the techniques that were used to make the unique animations of DOOM in a modern game envi...

▶ Play video

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it is not that exact article I read, but about the same thing:
https://www.gamasutra.com/blogs/TommyThompson/20180806/323715/Cyber_Demons__The_AI_of_DOOM_2016.php

Cyber Demons | The AI of DOOM (2016)

Eight years in development, 2016's DOOM was a long awaited return for the franchise. I take a look at the AI toolchain adopted in the game, where it comes from and the secrets that reinforce the game's 'Push Forward Combat' philosophy.

fallow hound Aug 15, 2019, 5:07 PM

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Thanks!!

misty holly Aug 15, 2019, 6:06 PM

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is there an easy way to do formations like just have 3 ai side by side with 2 rows of them so 3 in front and 3 in back would I need to put them all in an array and have them just get a set location away from one another or?

fluid harbor Aug 15, 2019, 9:25 PM

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I've never done formations, but you can do it in multiple ways. Here are some ideas:

you have a leader (your central unit location), then you just need to find best locations relative to the leader according to your formation. You can use EQS to find those locations.
you have a formation grid with predefined locations (you can make any formation!). To each unit you assign a relative location on that formation grid. Then you should search a path for your destination location (sync call). Save the path. Then you just need to project that grid on a map (with proper rotation) and then see what actual world locations should be for your units. Those locations should be projected to NavMesh so no points will be outside of it. When you move, you just offset your grid towards the goal using the path. One more thing, when you search for the path, you might want to consider a fact that your formation represents a wide single unit, so you need to search accordingly; otherwise, at corners/turns your formation will be breaking all the time.
make an individual search for each unit in your formation. You might need to pre-search path, break it down to smaller sections, move each unit according to the position relative to the section's location. Basically in a loop: you get section's location, project your formation grid, find path for each unit, move, offset grid location, project your formation, find path, move, etc. until you reach your destination.

azure cliff Aug 16, 2019, 4:25 AM

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Nice video share 😄

patent hornet Aug 16, 2019, 8:21 AM

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attach MoveToTarget Actors to the leader with an offset for each unit

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make the unit just follow their MoveToTarget around

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@fluid harbor @misty holly

fluid harbor Aug 16, 2019, 9:41 AM

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Yeah, good solution too! The only possible problem is corners.

patent hornet Aug 16, 2019, 9:50 AM

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crowd avoidance, partial paths allowed

ocean wren Aug 16, 2019, 10:24 AM

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EQS is definitely a good way to go, add some constraints that maintain line of sight with a lead unit, plenty of other things to maintain correct posture etc.

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One thing I did, is disable collision between agents in the group and then apply a seperation force to keep them apart. Helps a bit in tight spaces where there's inevitably some contention for space, having collision be hard makes that kind of thing almost impossible (this was a police squad going through doorways)

misty holly Aug 16, 2019, 1:07 PM

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@patent hornet @fluid harbor thx guys you are life savers ❤ I thought it would be a lot harder than that 😛

fluid harbor Aug 16, 2019, 3:11 PM

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unreal

south prism Aug 16, 2019, 4:05 PM

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Hey, I am struggeling with the ai perception component. All works fine for me but the ai perception seems like to activate just when the player is near. Is there a chance to get the component activated even if the player is really far away?

fluid harbor Aug 16, 2019, 4:59 PM

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hm... NPC's perception should not depend where a player is located. Can you turn on debug and see if it is drawing while your player is far?

fallow hound Aug 16, 2019, 5:02 PM

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Isn't there a sight range?

ocean wren Aug 16, 2019, 6:54 PM

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The perception component uses the sense types like sight, the sight config has a distance value, the reason it has that, is that in generally you dont want AI all activating across the map etc.

fluid harbor Aug 16, 2019, 8:12 PM

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not necessary, what if you want AI fights between each other? In fact, there might be no player, just viewers. The problem could be in something else.

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there is always an option to look in source code and see if there is any condition that disables perception. Performance wise, you do not want perception component working every frame either - every 0.2 sec is fast enough and you can run hundreds of AI with perceptions without any noticeable delay.

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Alternatively, you can do your own quick math to get actors in a sight cone.

south prism Aug 16, 2019, 9:35 PM

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Thank you all for your reply @fluid harbor @ocean wren @fallow hound . I did a workaround with collision spheres. I thank you all to spent some time for my question.

fluid harbor Aug 16, 2019, 9:39 PM

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unreal

pale night Aug 17, 2019, 2:00 AM

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What would the downside be in using blueprint to control an AI rather than a blackboard. I feel like I dont really need a blackboard since the AI has a 1 second delay on any decision it makes. Am I just not understanding the use of a blackboard?

fluid harbor Aug 17, 2019, 2:47 AM

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Blackboard is just a container for your variables that you can get/set anywhere. It is heavily used in behavior trees (you set variables in blackboard in your actor/controller/inside BT, etc). You can definitely keep variables directly in your actor, but the downside of it that in behavior trees you will not be able to use predefined decorators as they use variables from a blackboard.
Alternatively, if you want you can avoid using behavior trees all together, but then you will need to implement all the logic inside your actor.

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For majority cases in AI programming, I would recommend using blackboards and BTs.

pale night Aug 17, 2019, 2:52 AM

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I understood most of that other than the predefined decorator, what is this?

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or rather what do you mean

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My Ai would be comparable to like a Monster Hunter style creature. Telegraphed attacks

fluid harbor Aug 17, 2019, 3:57 AM

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in BT we use decorators - basically it is conditions. So, most of those conditions use blackboard to read/compare values.
Predefined decorators - default decorators from UE4. Alternatively, you can make your own. But you might need to get a reference to your actor somewhere. Basically, just keep using blackboard or do not use BTs at all.

pale night Aug 17, 2019, 4:04 AM

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I think im not going to use BT at all lol Thanks though fam

pale night Aug 17, 2019, 4:27 AM

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is there a wrong way of doing stuff like this?

south prism Aug 17, 2019, 8:29 AM

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Just a small question. Is there a way that when for example 3 Ai's walking in line and the first stops, that the others walk around him so dont just walk against the first

pine steeple Aug 17, 2019, 12:47 PM

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crowd following

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or RVO avoidance

fluid harbor Aug 17, 2019, 3:18 PM

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one small thing about RVO - it does not consider NavMesh bounds, so potentially a unit can be pushed outside and it might stall. To fix that you will need to check in a timer unit's world position if it matches with projected to NavMesh position. If it does not match then you interpolate over time to that position.

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and also I would recommend to disable collision between units or use a very thin collider so units don't go through each other.

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technically collider is needed just for locomotion, not collision between units/projectiles.

near jetty Aug 17, 2019, 5:36 PM

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@fluid harbor RVO pushing enemies off the edges is a huge issue

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it makes it essentially worthless

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what i did in my game is that the character movement of enemies does NOT use physics

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instead, it snaps to navmesh

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a bit like the option to snap to navmesh that is already there, but much more aggresive

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the cool thing is that with such a thing, if an enemy moves straight into the edge of navmesh, he will just slide

viscid oasis Aug 17, 2019, 11:49 PM

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Is there an effective way to disable BT based on some kind of variable or what-have-you.

crude sage Aug 18, 2019, 12:18 AM

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@viscid oasis You can disable BT by getting BrainComponent from AIController and calling Pause/Stop Logic when you want to, and Resume Logic when you want to resume it.

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I haven't done it by myself, but that's what it seems to be :b

viscid oasis Aug 18, 2019, 12:30 AM

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Okay, neat I'll check it out. I haven't used the brain component before

fluid harbor Aug 18, 2019, 1:36 AM

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yes, exactly that one. I used it and it works.

viscid oasis Aug 18, 2019, 1:37 AM

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Thanks gang, it worked great

blissful gyro Aug 18, 2019, 8:15 PM

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hi Everyone!!
i have one questions if someone can help me

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is possible modify the Path of an AI with some type of filters?

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i send a picture to explain what i mean

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In this picture i put an example of modified path points.
The Green points is the automatic calculated path by unreal "Find Path to Location/Actor" but i want to change the Point 2/3 of the path to be in that position.
So i want to mantain only a part of the original path but under some conditions (my filter) i want to change only some points of the calculated path.
I've already done the filter logic but i don't know how to use it to modify the automatic calculated path
I hope someone can help me 😄

📎 unknown.png

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obviously after the path modification i want to use it with the "Move To" function

rich fable Aug 18, 2019, 9:26 PM

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unreal

orchid frigate Aug 18, 2019, 10:35 PM

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@blissful gyro you can use an EQS system and run your filter in there (e.g. using a distance to query service)
You can also code your own Logic with checks for all path points and exclude the ones which are not in your filter (there is a possibility to get Points on Path as an array and you can store it in a new array and remove unwanted points.

Or you use the already implemented EQS feature and than store the possible points in an array and send it to your move to task to pick the closest one to the actor as the next point to walk to

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If you want to use your own EQS here is a way:
The "Find Path" returns a navigation path object ref which has the path points stored

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Get this array and check each location witj your filters if they are inside or outside. if they are not inside replace them by a calculated offset location or remove it completely (idk exactly how many points are saved in the path)

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If you have cpp knowledge, just edit the find path function with your filter.

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But the cleanest way might be just creating a filter class and throw it into the filter class section of "Find Path to"
Your filter class should do the logic for you

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So you should sort out all possible locations too close to an obstacle

blissful gyro Aug 19, 2019, 1:22 AM

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@orchid frigate Thanks for the reply!
yes i've seen something about EQS but i've never used it.
So with EQS i can set my filter inside one of the service right? (I will do some study about it)
And i can also add a filter in the "Find Path To" (i've seen the filter class and in fact i'm study it in this moment)
I'll probably go with the filter class, i prefer a cleaner solution to manage the path modify.
This "filter class" can be made in BP or is necessary to do in CPP? (I can work in both way so is not a problem 😄 )

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however really thanks for the support you was amazing!

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"Get this array and check each location witj your filters if they are inside or outside. if they are not inside replace them by a calculated offset location or remove it completely (idk exactly how many points are saved in the path)" this is the thing i want to do, but the only thing i don't understand is how to replace the Current Path array with the new Path array and send to Move To Node (in BT) or in Move To Node on BP.

eternal halo Aug 19, 2019, 1:44 AM

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Is there a way for me to add a way to check a variable on EQS?

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for example

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📎 unknown.png

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Trying to find a player

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but I want to differentiate between team 1 and team 2

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so it doesn't track its own team mates for combat

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How can I EQS test for a team integer

pine steeple Aug 19, 2019, 5:55 AM

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have to make a custom test

slow bobcat Aug 19, 2019, 6:48 AM

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Hi!
I have a question about EQS.
Context:

The test is done by running a Listen Server PIE (Number of players 2, play in selected viewport)
There's a manager that runs certain functions to do optimizations. The manager only exists in the server
Said manager runs an eqs that detects how far an enemy is from the closest player and, if it's father than X units, it disables it (AI, Animation and couple other things). If it's closer than X units, it enables it again.

Problem:
So far we're doing the test with just one enemy. EQS works, everything seems fine but, we don't see the enemies stop animating. When debugging what's going on, the eqs "catches" the enemy (obtained from the EQS generator) and runs the logic in the server, but this enemy is not the one we see in the server/client windows. It's the server version, not the clients version (pointers are different also).

so what happens is, doesn't matter what do we do on that enemy, we don't see it reflected in the game. I always understood that any ai logic should be done in the server, but I'm starting to wonder if there are exceptions or if it's something else.

Any insights about this?

Sorry if this is confusing, I don't have better words to describe it because I don't fully understand what's going on.

pine steeple Aug 19, 2019, 6:50 AM

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you have to tell other clients

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they run a "simulated" version of the ai

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if you disable animations on server, it doesnt automatically disable it on clients

slow bobcat Aug 19, 2019, 6:51 AM

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this is because the Anim Instance only exists in the server right?

pine steeple Aug 19, 2019, 6:52 AM

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no

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anim instance is client and server

slow bobcat Aug 19, 2019, 6:52 AM

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I would expect the Ai to be paused when calling enemy->EnemyAIController->GetBrainComponent()->PauseLogic("too far from every player"); on the server, since the ai controller only exists in the server

pine steeple Aug 19, 2019, 6:52 AM

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you have to explicitly tell clients

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you want to stop the animation

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behaviour tree is server only

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animations etc are local

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if you have stopped the logic

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then the ai should technically stop

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if its only controlled via BT

slow bobcat Aug 19, 2019, 6:53 AM

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yeah, ok. I get it now. I was mixing things.
animations etc are local
yeah, I double checked, anim instance only exists in clients and it's not replicated.

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I should have noticed that on friday

pine steeple Aug 19, 2019, 6:54 AM

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AnimInstance can't be replicated at all

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not even via a RPC

slow bobcat Aug 19, 2019, 6:55 AM

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AnimInstance can't be replicated at all
yeah, just pointing it out in "rubber duck" mode

if its only controlled via BT
It's is, but they play Idle on a loop, so skeleton bones loop, calculate transforms and so on. That's what I need to pause.

Ok, ok, silly mistake then. I will do this right.

Thanks !

pine steeple Aug 19, 2019, 6:55 AM

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yeah best way is a replicated bool

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and handle it via OnRep

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meaning late joiners (or people outside of relevancy) get the memo

ocean wren Aug 19, 2019, 6:56 AM

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GrimTheReaper: Try having a look at navmodifiervolume's, those are the things that can alter the pathing costs, so you can use those to alter paths

slow bobcat Aug 19, 2019, 6:56 AM

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yeah, will do that way. I have an animation component to rep animation state changes etc when needed, will do it there.
Cheers! much appreciated!

blissful gyro Aug 19, 2019, 9:53 AM

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@ocean wren hi, thanks for the answer!
I've used the nav modifier volume until now but with that solution i must put a lot of volumes inside the level and is not a very smooth process.
With an automatic filter i can make the AI modify the path in the best way possible without all this work

reef birch Aug 19, 2019, 10:03 AM

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hellow, i followed the ai state of mind tutorial. and wes is using the actor has tag. However im trying all kinds of things to change the player tag so he can become dead and the actor has tag isnt valid .

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im trying to let the "enemy stop attacking

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when im dead

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so i want to change the tag upon dead

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but i cannot seem to figure a way to do it

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i saw some guidance about set tag, clear array.

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its all in vain

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i tried bools inside the ai perception code. but also that doesnt seem to work

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is there anyone who can guide me in the right direction.

orchid frigate Aug 19, 2019, 10:10 AM

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@blissful gyro yes EQS can filter within a service and your query context settings pretty easy. it will just need some setup.

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You can create a NavFilterClass in BP and cpp. In BP just do a new BP Class and type in Nav and you will find the major class NavQueryFilter. It also is a good idea to create a new NavArea as well to define your own areas much better(can be done in BP and cpp as well)

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""Get this array and check each location witj your filters if they are inside or outside. if they are not inside replace them by a calculated offset location or remove it completely (idk exactly how many points are saved in the path)" this is the thing i want to do, but the only thing i don't understand is how to replace the Current Path array with the new Path array and send to Move To Node (in BT) or in Move To Node on BP"
Well you just create a new array and send in via for each loop just the wanted points into the new path array. and this array you can send to move to via a loop as well to get the path correctly.

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@reef birch an idea is to have different Behavior States. So if the enemy attacks it has an attack state and if your character die the transition should be to an idle state (or whatever you want there). You can use enums and trigger the animations depending on the current enum with a switch.

If you want to keep it the way you have, I think your problem is that the dead check is not done for each attack ( so during the attack the enemy should check if it does the next shot/hit or not)

reef birch Aug 19, 2019, 10:23 AM

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i have the different states allready; i had pawn sensing with cast to and check if dead. that working fine. however i wanted to expand my bahavior tree and use the tutorial from epic games and use actor has tag. maybe its only good to have in that "case/situation)

orchid frigate Aug 19, 2019, 10:24 AM

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Can you show your code with the "Actor has Tag" node?

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And how you are changing the tag upon death?

reef birch Aug 19, 2019, 10:30 AM

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📎 ActorHasTag.jpg

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thats my question

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how to do that

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woops

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let me redo that screen

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📎 ActorHasTag.jpg

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when i used pawn sensing,

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i had a bool on my character

orchid frigate Aug 19, 2019, 10:32 AM

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Let me show you how to change it. Give me a moment

reef birch Aug 19, 2019, 10:32 AM

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is dead

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that worked fine

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but with the ai perception

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i cant get it to work

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i rlly like the implementation of that u can shake off enemies

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for my game its needed 🙂

orchid frigate Aug 19, 2019, 10:36 AM

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Alright, sorry i didnt get something right yet :D
so before you used pawn sensing and you got a bool for is dead.
Now you are using AI perception and want to use tags. so to stop perception you want to clear or change the tag?

reef birch Aug 19, 2019, 10:36 AM

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lool

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yes

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correct

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my zombie picture got deleted

orchid frigate Aug 19, 2019, 10:37 AM

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changing a tag

📎 unknown.png

reef birch Aug 19, 2019, 10:37 AM

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😦

orchid frigate Aug 19, 2019, 10:40 AM

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Each Actor has a tag array. If you have multiple tags just use this

📎 unknown.png

reef birch Aug 19, 2019, 10:47 AM

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i tried both of these options and it doesnt work

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im gonna dig into it and make some debug strings

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didnt have time for that yet

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ok i made a mistake there

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last option worked

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type

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typo

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ty very much

blissful gyro Aug 19, 2019, 11:00 AM

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@orchid frigate "Well you just create a new array and send in via for each loop just the wanted points into the new path array. and this array you can send to move to via a loop as well to get the path correctly." With this you mean i have to make a foreach loop on Path points array and set MoveTo target destination with one path point at time?
Because now i'm see Move To blackboard task and AI Move to node, i don't see any way to pass the new Path array to them.
I've done some research on answerhub to and i've seen is necessary to modify from cpp the PathFollowingComponent to modify path array before the MoveTo Task.

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however thanks for all the help you give, i've done a lot of steps forward in this and i know to be close to the solution!

thick surge Aug 19, 2019, 11:40 AM

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hey guys I made a post about EQS to see how I can approach teleporting the AI behind the player, see if you can give me a hand with this one https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/1654592-how-to-teleport-an-enemy-behind-the-player-with-eqs

Unreal Engine Forums

Hey guys I been watching a couple of tutorials related to AI and I wanted to give it a try, I'm going to show you what I have so far and maybe that way you can

reef birch Aug 19, 2019, 12:59 PM

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📎 AI_SetNullSensedPawn.jpg

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im back again,

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im getting a shitton errors on the ai perception trying to null out the enemy

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is there a proper way of resetting ai and it wont spit out 100's of these warnings

woven bobcat Aug 19, 2019, 1:08 PM

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hi i wanna ask where i can learn ai stuff other than epic livestream and docs since i need to learn the new ai system

orchid frigate Aug 19, 2019, 1:29 PM

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@reef birch add in an is valid before ai actions and errors will be gone

pine steeple Aug 19, 2019, 3:29 PM

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ai system is old

ocean wren Aug 19, 2019, 11:08 PM

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"new AI system" hahahaha

thick surge Aug 20, 2019, 11:06 AM

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@woven bobcat hi are you referring to the EQS system or AI in general?

woven bobcat Aug 20, 2019, 11:07 AM

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ai in general

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how to use EQS all of ai related

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etc

thick surge Aug 20, 2019, 11:09 AM

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well outside of the DOCS and livestreams you have this https://www.udemy.com/unrealengine-cpp/

Udemy

Create Multiplayer Games with C++: Unreal Engine Mastery

Unleash the power of C++ and Blueprint to develop Multiplayer Games with AI in this Epic Games-approved course.

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mind you this is CPP but it goes through AI

idle cape Aug 20, 2019, 2:08 PM

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^^^ Excellent Udemy resource. Tom Looman does a good job of showing you how to implement EQS and AI to create a basic yet fun horde mode game. Definitely recommend

slow bobcat Aug 20, 2019, 2:42 PM

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general question:
When you need to stop an action based on time (i.e: you want your ai to attack for 3 seconds so you call start attack - wait 3 seconds - call stop attack),
Do you prefer to have a service running every frame or do you control that in the AI Controller Tick?

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I'm considering options

idle cape Aug 20, 2019, 4:12 PM

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@slow bobcat Personally I would prefer making tasks and using timers, but, in your case, I would use a service. I believe using a service would allow for more character specific logic than an AI controller.

thick surge Aug 20, 2019, 4:13 PM

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@slow bobcat you could also make a blackboard decorator on a sequence that does the attacking and waiting, and then setting the key on the ai controller

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@bright rune hey man I went through the docs and followed several tutorials but I'm still confused with the EQS, I made a post on the forums with some pictures detailing the logic see if you can give me a hand and point out the flaws of what I'm doing 🙂 https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/1654592-how-to-teleport-an-enemy-behind-the-player-with-eqs

Unreal Engine Forums

Hey guys I been watching a couple of tutorials related to AI and I wanted to give it a try, I'm going to show you what I have so far and maybe that way you can

slow bobcat Aug 20, 2019, 4:19 PM

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hi! thanks for the inputs. My main concern with the service is that you can't switch it off/on like the tick function (I not always need to wait. sometimes it will be an immediate action, depends on the weapon type). About the decorator suggestion: not sure I follow. What will the decorator do/check exactly?

thick surge Aug 20, 2019, 4:21 PM

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that depends on what you want to do , maybe a float checking the distance between characters, or a line trace that if you hit return a boolean to true

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@slow bobcat this might help you understand it a bit better https://youtu.be/gH88ZKB1_IE?t=2939

YouTube

Unreal Engine

AI: State of Mind | Live from HQ | Inside Unreal

The documentation team has been hard at work expanding and improving the documentation for AI. Wes Bunn will be in the studio to talk about these improvement...

▶ Play video

slow bobcat Aug 20, 2019, 4:27 PM

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ah ok ok. I thought you were suggesting a specific solution. Thanks for the link. yeah, I know how this works (plenty of custom nodes already). I think I will do the easy way (tick on/off) and think a little bit more about this. Cheers!

bright rune Aug 20, 2019, 4:52 PM

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@thick surge this should get a point behind player. You can add other tests and tweak the area if needed. You can debug it in game if you aim at AI, press * and then numpad 3. Current target means player in that picture.

📎 eqs.JPG

thick surge Aug 20, 2019, 5:27 PM

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@bright rune Oh man I was trying that this morning after watching some tutorials and the reason I thought It was wrong it's because I was using the EQS test pawn

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https://gyazo.com/ef6753ae1443aec702a8125d34c5986a

Gyazo

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but yeah now it's working thanks man

bright rune Aug 20, 2019, 5:32 PM

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I usually test my EQS with behaviour tree. Put it most left thing in the tree with sequence, just EQS and wait so its easy to debug with the unreal AI debug tools.

thick surge Aug 20, 2019, 5:33 PM

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yeah I found the EQS test pawn to tedious because you have to manage two pawns to reproduce the behaviour https://gyazo.com/112e3df5837bb8110e0e3ef7b91b5b8f

Gyazo

verbal shore Aug 20, 2019, 6:36 PM

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Hey everyone, I have a question. Would using EQS in large open world map be a good idea? I haven't tried it yet because I'm worrying about performance but if it doesn't have a huge impact, I can use it.

fiery sorrel Aug 20, 2019, 6:44 PM

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Should be ok,

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Your navmesh might become an issue (as far as size) though

verbal shore Aug 20, 2019, 7:20 PM

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Thanks for the answer, I'm using dynamic navmesh with invokers

azure cliff Aug 21, 2019, 7:37 AM

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Hey guys, is there a way to set individual axis for EQS grid?

fiery sorrel Aug 21, 2019, 2:31 PM

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What are you trying to do?

unreal warren Aug 21, 2019, 3:06 PM

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hey is there any reason i shouldn't use components to drive unit ai in an rts-like game, instead of having an aicontroller for each? i'm trying to keep the game component-based, and it's really ugly to have units with components, controlled by an aicontroller with more components

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i'm wondering if there's anything i would miss out on by foregoing aicontrollers in that case

misty holly Aug 21, 2019, 4:15 PM

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can someone give me an idea of how to go about making flying ai for a 2d side scroller?

azure cliff Aug 21, 2019, 4:35 PM

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@fiery sorrel I'm trying to make a grid that isn't uniformly scaled.

fiery sorrel Aug 21, 2019, 4:36 PM

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@azure cliff You will most likely need to Extend

UEnvQueryGenerator

And create a custom generator.

azure cliff Aug 21, 2019, 4:37 PM

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Does it require c++?

fiery sorrel Aug 21, 2019, 4:37 PM

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Yea, a lot(most of the useful stuff) is in c++ for AI imo

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But it is VERY easy

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Create a constructor

    UEnvQueryGenerator_MyGenerator(const FObjectInitializer& ObjectInitializer);

Override 4 functions

    virtual void GenerateItems(FEnvQueryInstance& QueryInstance) const override;
    virtual void ProcessItems(FEnvQueryInstance& QueryInstance, TArray<AActor*>& MatchingActors) const {}

    virtual FText GetDescriptionTitle() const override;
    virtual FText GetDescriptionDetails() const override;

and add your custom logic

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And you can put your code into generate items

azure cliff Aug 21, 2019, 4:40 PM

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Ah i see, thanks for the help! 😄

woven sage Aug 21, 2019, 6:39 PM

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Hey guys, does anyone have any leads on getting root-motion working for actor-derived classes? I'd like to use root motion, but I don't want to rely on the character/pawn classes

flint trail Aug 21, 2019, 8:30 PM

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Is it possible to make flying AI using stock nav mesh and BP/BT ? (by flying I mean something like Cacodemon in Doom)

woven sage Aug 21, 2019, 8:36 PM

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If you want it to be able to navigate without touching the navmesh, then no, you'll need other pathfinding methods

flint trail Aug 21, 2019, 8:38 PM

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@woven sage it can touch nav mesh (visual model will be offset above the ground anyway)

woven sage Aug 21, 2019, 8:39 PM

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If it's just vertical offset from the navmesh, sure, just find a way to determine the vertical offset from the navmesh

fiery sorrel Aug 21, 2019, 8:39 PM

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if your flying already just place down meta data markers and have the AI path to them. If a target is near by go attacking target logic. But it won't be a dynamic type of pathfinding

flint trail Aug 21, 2019, 8:39 PM

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just need for it to hover over, visually, obstacles, instead of going around them

woven sage Aug 21, 2019, 8:39 PM

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Cast a ray up from the navmesh point, check how far up it can go

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Ah

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Now that's annoying

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Because you don't know which obstacles you can hover over

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And which it does need to go around

fiery sorrel Aug 21, 2019, 8:40 PM

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Nav links that shift the ai into a "flying" mode can be used

woven sage Aug 21, 2019, 8:40 PM

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So if you want it hovering over obstacles rather than around them, you'll either need a high step-up height and navmesh on top of the obstacles

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Or you'll need to have a 3D navmesh

flint trail Aug 21, 2019, 8:41 PM

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I think high step-up height and nav mesh on the obstacles would do

woven sage Aug 21, 2019, 8:41 PM

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Navlinks could definitely help, depending on the situation, but I've always found them problematic,

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They're also a lot of manual work

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Only thing with step-up height is that I don't exactly know how it works in-engine, or whether you can set it per entity

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I think you can, though

flint trail Aug 21, 2019, 8:42 PM

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Although Cacodemons in Doom could rise up at any height (below max height)

woven sage Aug 21, 2019, 8:43 PM

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You could also do something with raycasting upwards from the navmesh to see how high it can fly in its current position

flint trail Aug 21, 2019, 8:43 PM

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I'd probably have to cover entire level in nav mesh bounds so that all obstacles/floors could have it

woven sage Aug 21, 2019, 8:43 PM

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That'd help in making it change height more dynamically

flint trail Aug 21, 2019, 8:43 PM

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I see

woven sage Aug 21, 2019, 8:44 PM

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That said, it wouldn't make a difference in actual... Well.... Navigation

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It'd really just be a thing to determine "How high can I float in my current position"

flint trail Aug 21, 2019, 8:50 PM

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ok, but once it determines it can fly that much high, what's gonna drive AI character to move upward or downward vertically ? (or on an incline, forward+up for example)

woven sage Aug 21, 2019, 8:52 PM

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You just move the mesh and such

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Don't move the actual actor

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Keep the actor on the navmesh

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But move all the colliders and meshes and stuff up

flint trail Aug 21, 2019, 8:54 PM

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I see.. Thanks

azure cliff Aug 22, 2019, 7:24 AM

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Hey @fiery sorrel , What does virtual void ProcessItems(FEnvQueryInstance& QueryInstance, TArray<AActor*>& MatchingActors) const {} do?

fiery sorrel Aug 22, 2019, 11:24 AM

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I override it to do nothing.
But it's kinda like a post process the list of actors selected

swift bolt Aug 22, 2019, 1:30 PM

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Anyway to find out what is causing my Nav Mesh to turn red?

patent hornet Aug 22, 2019, 4:03 PM

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nav modifier

fiery sorrel Aug 22, 2019, 4:08 PM

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Usually a nav modifier thats sitting inside your nav volume. Or you manually changed the colors with a class/editor settings

fallow hound Aug 22, 2019, 6:27 PM

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Hi all, I'm curious how you all have handled aiming and shooting in your behavior trees. Right now I am making them work through services I sprinkle throughout the tree, so the player can aim and shoot while moving, or aim and shoot while holding a position. I was curious what others have done.

blissful gyro Aug 22, 2019, 9:46 PM

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Hi guys, I have one question for you.
The Nav Agent of AI has a shape similar to a capsule right?

pine steeple Aug 22, 2019, 10:11 PM

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it is a capsule

blissful gyro Aug 22, 2019, 10:31 PM

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@pine steeple is possible to change the shape of the nav agent?

pine steeple Aug 23, 2019, 2:35 AM

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no

fiery sorrel Aug 23, 2019, 4:19 AM

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You can change it's size, but I don't really know of a reason to have a different shape.

azure cliff Aug 23, 2019, 6:08 AM

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@fiery sorrel Thanks for the help but i think i should not touch cpp for now. 😅 I don't even understand the basics and i'm trying to work on custom eqs grid. lool

reef birch Aug 23, 2019, 10:35 AM

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question: is there a hard limit on blueprint ai?

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i can get about 50 in there

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the others just stand still

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even when i kill a couple

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unpossess ai

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its quite simple behavior tree

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it doesnt even matter if i enable or disable hearing

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its still the same number of ai

spiral shuttle Aug 23, 2019, 11:40 AM

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[/Script/AIModule.CrowdManager]
MaxAgents=75

add this to your DefaultEngine.ini

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@reef birch

reef birch Aug 23, 2019, 11:47 AM

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thx, that seems to have fixed it

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@spiral shuttle

upbeat hearth Aug 23, 2019, 11:52 AM

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hi, is there a delegate or function that fires when a behavior tree finish?

reef birch Aug 23, 2019, 12:10 PM

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what are the ways to optimze ai? put it over to c?

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any other tips maybe about possesing in and out?

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in multiplayer ai rlly seem to have impact on performance

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espcially related to lag

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im trying to make like a zombie game with a descent amount of enemy

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is crowd able to be used? and let them "loose there master" to wonder off solo that his behavior tree starts ticking

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how do other people handle large amounts of npc or enemy

woven sage Aug 23, 2019, 1:47 PM

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By not using the default character system

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In my experience the character system has absolutely horrible performance

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The main thing it's got going for it is the gravity and movement prediction which are already in

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Both of which, though especially the latter, are pretty hard to get right in your own implementation

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It's a great system for games with just a few players/AI

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But other than that, it's largely unusable because of its massive overhead

reef birch Aug 23, 2019, 2:28 PM

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@woven sage thx for response btw

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im still very noob, so how can i prevent this default character system

ornate shoal Aug 23, 2019, 4:48 PM

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Base your NPCs off of a pawn instead of a Character, and write your own movement component.

fiery sorrel Aug 23, 2019, 4:56 PM

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If your trying to get over 50+ AI you should attempt to reroll the AI system to better support your needs.

CMC is meh, and overkill for most horde based games. I highly recommend looking at rolling an ECS system and if you really wanna go ham attempt to implement a fiber job system as well to process your ECS updates. This should allow you to massively extend the number of AI you have in your game. but the amount of effort is not small

spiral shuttle Aug 23, 2019, 5:17 PM

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no need to use an ECS or fibers for 50-100 ai's (especially as a he self-described as "still very noob")

bold fjord Aug 23, 2019, 6:10 PM

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I'm not entirey sure if this is the best channel for this question but I couldn't find one that I felt like better suited it so yeah, What are some ways to setup an NPC schedule system like in Skyrim and Oblivion? Where you have a big open world with thousands of NPC's that all have certain tasks they have to follow?

fallow hound Aug 23, 2019, 6:40 PM

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It's a big task, and a lot of research has been done on it. Google "ambient ai" to learn more. As far as ue4, you'd for sure want some way to fake activity for distant NPCs, and some sort of time of day system.

pine steeple Aug 23, 2019, 9:01 PM

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bheaviour trees dont really "finish"

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oops delayed

verbal shore Aug 23, 2019, 11:02 PM

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Is there any way to make AI avoid from player's or other ai's sight? I'm using EQS and AI Perception. I want to give better score for the items that are not in the sight of the predator ai.

verbal shore Aug 23, 2019, 11:30 PM

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📎 unknown.png

quasi knoll Aug 24, 2019, 2:16 AM

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@verbal shore this video should help you get started https://youtu.be/gH88ZKB1_IE

YouTube

Unreal Engine

AI: State of Mind | Live from HQ | Inside Unreal

The documentation team has been hard at work expanding and improving the documentation for AI. Wes Bunn will be in the studio to talk about these improvement...

▶ Play video

misty holly Aug 24, 2019, 6:03 PM

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so is detouraicontroller the best thing to have ai have avoidance?

pine steeple Aug 24, 2019, 6:29 PM

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that the engine supplies possibly

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RVO is kinda iffy

misty holly Aug 24, 2019, 10:25 PM

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i just need them to avoid other ai so they dont just hit each other would the detouraicontroller be good enough for that or should i try and make something custom for it?

fiery sorrel Aug 25, 2019, 4:20 PM

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RVO is meh, Detour is nice, but has limits.
I used a flocking system as it was much lighter but a bit more work

tawdry tusk Aug 25, 2019, 11:20 PM

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Hello everyone! I am curious on how you get a roaming AI to go from walking to Running once it spots the player? Mainly just trying to find videos that explain and show it but if someone has BP for that i could look at thatd be great. I imagine its much like using a blend space but not really sure still kinda new to this been using UE4 for about 5 months now

tawdry tusk Aug 26, 2019, 3:25 AM

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So i solved my first problem, but now when my AI chases the player, i cannot get him to stop following even though im no longer in range. Any ideas?

azure cliff Aug 26, 2019, 5:29 AM

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@tawdry tusk Might be because the variable target isn't being set to null.

tawdry tusk Aug 26, 2019, 5:29 AM

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@azure cliff thank you for responding, but i fixed it using a behavior tree.

azure cliff Aug 26, 2019, 5:30 AM

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Alright

ocean wren Aug 26, 2019, 10:35 AM

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Questions for you all.. do you think that the AI functionality in UE4 is bad? What is the biggest pain point do you think?

azure cliff Aug 26, 2019, 10:37 AM

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For me, I can't seem to work with behaviour tree. I think it's kind of confusing to me.

ocean wren Aug 26, 2019, 10:37 AM

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really? just the concept or the actual implementation?

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have you tried any other behavior tree systems?

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honestly, I think UE4's BT system is kind of borderline broken in terms of UX/UI, but the concept of BT's is pretty simple

azure cliff Aug 26, 2019, 10:39 AM

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I'm still new to UE4. I have not tried other behavior tree systems before.

I tried to implement status effects to AI but you have to manage the state at behaviour tree as well.

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I have combat system that controls AIs in a field to determine whether they should attack now or later.

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I could just call the functions in AI without BT. 😅

ocean wren Aug 26, 2019, 10:41 AM

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I guess a big part of the confusion is that Epic went and made lots of systems without documenting them or actually caring much about usability. There's an "abilities" system for status effects in the engine, which they use for Fortnite, but its not documented properly

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So basically, the problem is that the BT structure doesn't feel natural to you if you could do it in code?

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I am guessing you're using blueprints?

azure cliff Aug 26, 2019, 10:42 AM

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I'm using blueprints only

ocean wren Aug 26, 2019, 10:43 AM

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gotcha

patent hornet Aug 26, 2019, 10:55 AM

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its not much different from code to BP

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there is one... landmine they left

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the nodes aren't instanced by default in code

ocean wren Aug 26, 2019, 10:57 AM

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you mean the BT nodes?

patent hornet Aug 26, 2019, 10:58 AM

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yeah

ocean wren Aug 26, 2019, 10:58 AM

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Well, that's by design really.. the thinking is that the BB data would be instance specific, but the tree wouldn't

patent hornet Aug 26, 2019, 10:59 AM

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only using BB key selectors in c++ is kindofa nightmare

ocean wren Aug 26, 2019, 10:59 AM

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its a bit of a false economy, but hey..

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false even

patent hornet Aug 26, 2019, 10:59 AM

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i think you need 6 lines of code for one of them to work

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:S

ocean wren Aug 26, 2019, 11:00 AM

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Yeah, the whole setup could use some usability work

patent hornet Aug 26, 2019, 11:00 AM

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you can grab the values from BB directly, which i recommend when doing it in c++

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but overall, the BTs are quite usable, if a little BP oriented

ocean wren Aug 26, 2019, 11:01 AM

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I think one of bigger issues, is just that the BT+BB setup is not intuitive like it should be.. lots of UI stuff doesn't work as it should

patent hornet Aug 26, 2019, 11:01 AM

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should stick to BP for flow, just parent the really heavy logic in c++

ocean wren Aug 26, 2019, 11:01 AM

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for instance, you should be able to add values into the BB within the BT editor

patent hornet Aug 26, 2019, 11:02 AM

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as in new entries?

ocean wren Aug 26, 2019, 11:02 AM

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hmm, I'm not sure I agree with BP for flow.. BP is a hell of a mess for complex behaviors

patent hornet Aug 26, 2019, 11:02 AM

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you kinda can, there is a tab control that swaps between BB and BT

ocean wren Aug 26, 2019, 11:02 AM

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yeah, but that's a tab extra you shouldn't need

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the BB values should work like the regular BP variables

patent hornet Aug 26, 2019, 11:03 AM

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and as for complex behaviors

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there is a Task that runs a BT

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so its not that hard to encapsulate and reuse parts of your logic

ocean wren Aug 26, 2019, 11:04 AM

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sure, but I'm still not a huge fan of BP layouts for complex structures if you're trying to understand and debug

patent hornet Aug 26, 2019, 11:04 AM

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you can see whats going on in there pretty well

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with the exec wires lighting up like in BP, and the decorators that fail having a red block right hand side

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it is an acquired taste, sure, but it works fine once you get used to it