gameplay-ai

[naive veldt]

Every time I create a new level the navmesh never works, no matter what, the npcs don't move, the mesh is not painted green.
Then suddenly and after hours trying to find a solution it start working for no reason. WTF.

[west gorge]

I had a similar issue, it had to do with runtime generation of the navmesh and the NPCs getting spawned before that happens and not finding a navmesh on spawn.

How would I make a behaviour task that locks the tree until it is finished? The task triggers an attack, but it keeps cancelling itself before the attack goes through. I know AI Move To has a flag to lock the AI until it completes, but I need something like that for an arbitrary task. 🤔

Apparently it is really easy to do... 🤔

[uneven cloud]

What is cancelling the task? That sounds more like a bug than missing functionality.

[celest python]

Mikko isnt active since 2022

[lyric flint]

I have faint recollection of the issue, but details are lost. The commit you linked links to this commit, which sounds like it could be the fix:
https://github.com/EpicGames/UnrealEngine/commit/2372c0c1e75d3f37dce0a7cb8aead2efc013a8cc

[harsh storm]

Hi Mikko! 🥳

[steel moat]

@misty wharf sorry to tag u but yesterday u told me to use AI perception component instead of Pawn Sensing, there was a even in Pawn sense component "On See Pawn", that event gets fired every frame till pawn is in sight but in ai perception theres no such event that works same as the On See Pawn, so how to work with that? Im new to this AI Stuff so idk much. Lemme know if theres a way

[misty wharf]

With AI perception, you should use On Actor Perception Updated. It will be called once when the status of perception for some actor changes. For example, when an actor becomes visible, it will get called, and when it is no longer visible it gets called

You can use the successfully sensed value to determine which one it is, it will be false for when it's no longer visible

If you need to run logic on tick based on what's being seen, you can use get perceived actors in tick

although I'm not entirely sure why you would need to do this on tick

[steel moat]

not on tick

i wanna make ai shoot player

whenever he sees one

[steel moat]

yea so my code only shoots one time

[misty wharf]

Right, so you would need to check if the AI still sees the player once you've finished shooting once or whatever you're doing

There's tutorials for how to do enemies that chase and attack you on YT if you look up something like "unreal ai perception"

[serene hollow]

Thanks Mikko! I’ll cherry pick that commit and rebuild the engine and see if it fixes it!

[pearl fern]

Hey!

Is there a way to use the EQS with state trees instead of behaviour trees?

[misty wharf]

Yes, EQS is not dependent on BT's

You will need to create a custom task to do it though since there is no builtin one

[steel moat]

i managed to do it but idk why it doesnt detect the target, and the ai perception debug is also not showing in the editor when i play and when i turn on the perception system it says 0 listeners is this related to hear config??

[pearl fern]

@zomg yup, thanks 🙂 I managed to generally run a query inside a State Tree Task, but now I gotta set up a Query that is tailored towards my needs and not using blackboard keys

I guess it is not possible though to create an Input on the State Tree Task and somehow send that into the EQS query

Say I already defined a certain actor in the task beforehand, I could not send that over so the EQS would use that

[misty wharf]

If it isn't detecting anything you may have to check all the boxes in detection by affiliation but it's a bit hard to say if that's the issue here

[steel moat]

it is true

[misty wharf]

It kinda depends on what you want to send, it has the same limitations as it would have with BTs with regards to that

[steel moat]

SightConfig = CreateDefaultSubobject<UAISenseConfig_Sight>(TEXT("Sight Config"));
if (SightConfig)
{
    SetPerceptionComponent(*CreateDefaultSubobject<UAIPerceptionComponent>(TEXT("Perception Component")));
    SightConfig->SightRadius = 1000.0f;
    SightConfig->LoseSightRadius = SightConfig->SightRadius + 25.0f;
    SightConfig->PeripheralVisionAngleDegrees = 90.0f;
    SightConfig->SetMaxAge(5.0f);
    SightConfig->AutoSuccessRangeFromLastSeenLocation = 520.0f;
    SightConfig->DetectionByAffiliation.bDetectEnemies = true;
    SightConfig->DetectionByAffiliation.bDetectFriendlies = true;
    SightConfig->DetectionByAffiliation.bDetectNeutrals = true;

    GetPerceptionComponent()->SetDominantSense(*SightConfig->GetSenseImplementation());
    GetPerceptionComponent()->OnTargetPerceptionUpdated.AddDynamic(this, &ATurret_AIController::OnTargetDetected);
    
    if (GetPerceptionComponent()->OnTargetPerceptionUpdated.IsBound())
    {
        UE_LOG(LogTemp, Warning, (TEXT("BoundSuccessfull"))); 
    }
}

[misty wharf]

You should not bind delegates in constructors, it can cause various problems

best to do it in BeginPlay

[steel moat]

ohhhhhh

[misty wharf]

whether it's the cause of the issue you're seeing, not sure

If you made any blueprints based on this C++ class, you may need to recreate them if you bound delegates in the constructor

otherwise the delegates can be saved into the BP itself and the problems will persist

[steel moat]

this code is in controller and there are not any bp derived classes of that

[steel moat]

theres another issue too, the function im binding is not getting called

[serene hollow]

Unfortunately, it doesn't seem like that resolves the issue. I guess I'll have to give 5.4 a chance at some point and see if it resolves it, and otherwise file a bug report

[misty wharf]

Try placing two AIs near each other, they should detect each other at the very least if everything is working as expected

They should detect players as well by default assuming your player is a pawn

[steel moat]

i found the bug, i accidentally deleted the config

[misty wharf]

heh :)

[steel moat]

GetPerceptionComponent()->ConfigureSense(*SightConfig);

this line

Stimulus.WasSuccessfullySensed()

the pic and the line both are same variable???

[misty wharf]

Yes

[steel moat]

its not getting called

[misty wharf]

Add some logging on the line before the delegate is bound and see if it's even being bound I guess

[steel moat]

i did

the delegate is getting bound

[misty wharf]

how did you determine the delegate is not being called at all?

[steel moat]

the delegate is getting called

but

wait i will just show the code

void AIController::OnTargetDetected(AActor* Actor, FAIStimulus const Stimulus)
{
    
    
    if (Stimulus.WasSuccessfullySensed())
    {
        if (APawn* TPawn = Cast<APawn>(GetPawn()))
        {
            GetWorld()->GetTimerManager().SetTimer(TimerHandle, this, &AIController::AIShoot, delay,true);
        }
    }
    else
    {    
        UE_LOG(LogTemp, Warning, TEXT("CancelTimer"))
        TimerHandle.Invalidate();
        GetWorld()->GetTimerManager().ClearTimer(TimerHandle);
    }
    

}

im saying the successfully sensed bool is not getting false

[misty wharf]

Then it means whatever was visible is no longer being perceived

[steel moat]

i meant "not" my bad

[misty wharf]

Ah if it never gets set to false then it would suggest it's still visible

Although you have the max age also set - I don't know how that affects these

Same with the auto success

I vaguely recall those values can affect how the stimulus gets updated

[steel moat]

this is the log

timer is getting cancelled but its generating again...

[misty wharf]

Well it says cancel timer so that seems to suggest it's definitely being set to false sometimes?

[steel moat]

yes

but then its getting true again

[misty wharf]

That probably means something blocked line of sight momentarily

[steel moat]

even when ai is not looking at the target

[misty wharf]

By default the sight linetrace channel is Visibility, so if you had something that blocks visibility between this and the target then it could happen

[steel moat]

theres nothing in the level besides two instances of that ai

and a platform ofc

[misty wharf]

When you shoot are you shooting projectiles

And I'm noticing it says "attachment", if you have actors attached to your pawns, they can also block

[steel moat]

yes

[steel moat]

skeletal mesh component

[misty wharf]

Yeah so it's possible your projectile blocks LOS if its collision settings block on Visibility

or any attachments you have

[steel moat]

so thats what its detecting?

even after moving away from the pawn??

[misty wharf]

Could be, check their collision settings

The sight sense works by doing a linetrace between the source actor and any targets so if something blocks the trace then it won't see it

[steel moat]

the projectile had a block on visible i changed that yet no difference, the ai keeps on shooting even after moving away from pawn

but it starts shooting whenever ai sees a pawn

but doesnt stop

[dapper crest]

I'm having an issue where the characters sometimes seem to lose focus but I can't find how or why. Basically, I use a RotateToFaceBBEntry to keep the character facing its target and I see that this internally uses focus. But sometimes the AI doesn't have any focus and reverts to orienting itself towards its movement direction, but there's no place where the focus is being disabled. Are there any ways or BT nodes that clear focus where it's not entirely clear?

[jade haven]

Maybe it's not focus that's at play here. Are you setting focus directly or setting it to a Blackboard Key reference

If the latter, then something might be clearing the key value and thus clearing focus

[dapper crest]

No it was focus. I didn't know the RotateToFaceBBEntry set and cleared focus internally.

[jade haven]

Oh really? Interesting, I didn't know that.

Glad you got it sorted!

[coral mesa]

I want to write my local avoidance. Where should I start for? Btw its not CMC

[celest python]

PathFollowingComp

[coral mesa]

got no avoidance

[celest python]

I want to write my local avoidance
thats where you will write it

[coral mesa]

just sticks into navmesh.... sometimes

[coral mesa]

but where to start and how to actually make one?

[celest python]

read about RVO, ORCA, detour and check GDCs

avoidance is a solved problem

you wont be inventing something completely new

[pearl fern]

Still struggling a bit with passing around variables in state trees.
How can I use the output of a previous task as the input of the following?

It seems to be marked correctly as output, yet I cannot bind it.

[coral mesa]

where is the GDC talk for that?

really wanted to repurpose internal avoidance but thats just heavily designed towards CMC

[uneven cloud]

Why can't you use detour?

[coral mesa]

internal detour is heavily integrated with CMC and you can't just make derivatives out of it as it stands

Seems like you have to touch directly to Engine codes

atleast where it initializes

regardless can you access more internal detour avoidance?

if so what are the steps in rough TLDR?

[uneven cloud]

It actually isn't integrated with the CMC. You can make your own movement component that is a child of the nav agent movement component.

[coral mesa]

im using 3rd party ECS which is very outside of traditional Actor system

[uneven cloud]

Why would you use an engine and then not actually use the engine?

[coral mesa]

for my work case UE Actor is slow and mainly due to how CMC is designed

cant run NPCs more than 200

when I need something like around 2k

so need something like ECS memory management to compensate that problem

Mass doesnt comes with pathfinding solution and very much at its infancy

[uneven cloud]

Mass does come with a pathfinding solution. Your version can't even use the default pathfinding anyways, because that's tied to having a movement component.

There are also many ways to optimize the CMC, because you can make a child class of it.

[coral mesa]

im using direct pathfinding calls like findpathsync(plan to go async) and getting points to move

[coral mesa]

tried it and was very bad and complex

[celest python]

using ECS only to avoid movement cost is awful

MoveComponentImpl is what you are going to run no matter what

and it cant handle 2k entities regardless of ECS or not

search "vblanco trick" on this discord

utilize it with something you can utilize better cpu cache and parallelism, it does wonders

[misty wharf]

Data from tasks inside sibling states cannot be bound to each other, only parent-child or from global tasks or evaluators, or within tasks inside the same state

[pearl fern]

@misty wharf I see, thanks!

[pearl fern]

@misty wharf do you know the difference between state completed and state succeeded?

[misty wharf]

iirc completed is any kind of state other than "running"

so both success and failure counts as being completed

[coral mesa]

managed to got 2k+ rn with ECS

[celest python]

2k MoveComponentImpl wont run well, but 2k with maybe ISM or so could work

but then you would suffer from other things ISM induce

[coral mesa]

yeah that. Using TurboSequence which handles anim side nicely

its open source

regardless my problem with Movemment Comp was regardless of what I use, performance its just bad and can be blamed mostly on CMC

I turned of Skeletal Anims and still no solution

there is weird smoothing behavior with CMC which reruns code several times in a single frame

[coral mesa]

im not finding the message regarding to this

[celest python]

#cpp message

[harsh storm]

Stop polluting the search with this. It is now a pinned thing in #cpp. Point to that.

[proven flint]

Hi, if i want to use the Nav Modifier Component to dynamically change the navigation in some areas of a navmesh, do i really need a Box/Sphere collision and normal static meshes won't work ?
I mean With all the fitting into collision logic, the failsafe box extent works but i can't change it runtime in the Blueprints so yeah

[west gorge]

Let's say there's an ability being used based on a condition, but the condition becomes false before the ability completes (eg. the enemy has LOS to you and starts shooting at you but you take cover, the shot should still go through)

[midnight compass]

Anyone here that can explain or show graphs of the Learning Agents setup in 5.4 preview?

[uneven cloud]

Except now your problem is that you have to rewrite nearly all the functionality that you need.

[uneven cloud]

It's only cancelling because you have it set as an observer abort.

[west gorge]

But if I don't, it keeps repeating the action forever...? 🤔

[uneven cloud]

Why is it repeating the action forever? It only does that if you set it to do so.

[west gorge]

Uh

🤔

I'm an idiot right

[coral mesa]

blame UE for that. It doesn't have anything lightweight like Unity where you can just add a NavigationAgent component and call it a day. More importantly it's far more optimized

[coral mesa]

btw what's CrowdFollowingComponent?

[dense owl]

More of a blob really 😀

[uneven cloud]

That is not actually true. It's just means you have to make a movement mode that supports it.

Why does the capsule need to be rotated instead of turned off? They don't move around when they die. If you are using ragdoll, typically you turn off the capsule.

[silent fox]

yeah thats what i did but thank you

[coral mesa]

Is there any documentation about CrowdManager?

[uneven cloud]

https://dev.epicgames.com/documentation/en-us/unreal-engine/using-avoidance-with-the-navigation-system-in-unreal-engine?application_version=5.3

[abstract yarrow]

Hey guys. I'm trying to use a procedural generation level layout system for my game (dungeon architect) and I'm unable to get my enemy AI to chase my character throughout the levels. I've changed the navigation mesh runtime generation to dynamic and I've added the navigation invoker component to my enemy AI. This is what my gameplay is looking like right now

I'm using a simple behavior tree system that I've verified works in a test level, and when the player collides with the enemy he does die and spawn correctly

I forgot to disable character movements and accidently got a fixed camera look for a second 😂

[fierce carbon]

I added AI Perception to my AI controller (settings attached) - but I noticed if the player goes behind something (partly blocking player from view) it sort of glitches a bit. Are my settings right or am I missing something? Thanks in advance.

[hardy shuttle]

What does State Machine mean when compared to Behavior Trees?
"Do not try to implement a State Machine into Behavior Trees."
https://dev.epicgames.com/community/learning/tutorials/L9vK/unreal-engine-common-issues-with-behavior-trees-and-things-you-should-competely-avoid

[stray pulsar]

i think it means don't put condition, not sure though

[dense owl]

I mean that text pretty much tells you everything no?

State Machines are generally used in animation, allowing the user to use bools to transition from one state to another

But they can also be used as an AI tool. The point there is to use the right tool for the job not try to force a BT to act like an SM

[lyric flint]

Hey guys im trying to make blackboard variable and set default value where's can set default value?

[lusty nebula]

Hi - sorry to necro a comment from so long ago. I'm currently trying to research Vislog and work out how I can use it for some stuff I need. I was specifically hoping to include the ability to toggle it in a packaged build if needed. I was looking at the source code and it seems reliant on ENABLE_VISUAL_LOG. Is there any licence reason we cant include it in a packaged build if we're only using it to capture the data?

And then replay it on a development version that has the editor?

[celest python]

What I'm trying to say there is basically dont try to force BT's execution method by using decorators to switch between tasks randomly

Switching between same exec depth nodes is ok if context is apt. but dont jump into a very deep small and irrelevant node to some other irrelevant deep small node that is far away from you

thats where (H)FSMs shine

BT is rather meant to work by deciding whats more prior to execute

[misty wharf]

Tbh the distinction seems very very thin to me

Almost all BT logic I've seen is literally states

The canonical example of chase an enemy when the enemy is visible is literally a state machien lol

[celest python]

its about transition

not states

[digital girder]

What is the best way to have Do-nothing Behavior tree?

When I supply nothing to "Run Behavior tree" node it just continues to run the previous one.
How do I completely stop it from execution? Can I do it even?
Best way I came up with is to have another BT with 1 wait node.

[misty wharf]

Stop Logic or whatever it was called should entirely stop it

[misty wharf]

I'm not sure if I follow but if you just want an input field to type something into, change the category fo Parameter

instead of Input

[oblique basin]

I agree. States with a side of prioritisation.

[misty wharf]

There's some examples I think in the State Tree "folder"

Oh, yeah the website lol

But yeah in UE source just pop open one of the builtin C++ tasks, that should give you a decent starting point

[uneven cloud]

You used to be able to, but a late version of 4 tied it completely to the editor, so you can no longer record in a packaged build.

[uneven cloud]

You don't set a default value. The default is whatever invalid is for that type.

[lyric flint]

isn't it a default value? how can I set a default value?

[dense owl]

You don’t set a default for the key, you set a default for a variable and then set that key to point to (or hold if you will) that variable

A key itself is either set or unset.

[velvet yacht]

how do i get sense config array from aiperception component?

[uneven cloud]

What is it that you are trying to do?

[velvet yacht]

i am trying to dynamically change sense values

some guy said this is not possible and i need to use pawn sensing

some other guy said no you can do it easy just follow these steps

and these steps don't work

https://www.reddit.com/r/unrealengine/comments/neubxw/change_ai_perception_on_runtime/ @uneven cloud

[uneven cloud]

Those instructions are wrong. You need to use the ConfigureSense function to change it at runtime.

[velvet yacht]

where can I find this? is it a component, variable?

[uneven cloud]

The AI perception component

[velvet yacht]

Am I stupid? lol don't answer

can't find anything

:/

[uneven cloud]

I don't think you can in BP

[velvet yacht]

ohhh that's probably why

😦

I'm mainly working in BPs, tbh I have no idea how to code

I should use the pawn sensing component instead then, that provides more options?

[misty wharf]

pawn sensing is old and bad and I wouldn't touch it unless you really really have to

what's the reason you need to change the sense settings at runtime?

[velvet yacht]

well, how else can i adjust the different values of the AI while in-game?

[misty wharf]

maybe there's some workaround you can use

[uneven cloud]

https://www.unrealengine.com/marketplace/en-US/product/perception-extension

[velvet yacht]

I just want the Ai to be affected by different things such as time of day

[misty wharf]

Looks like Luthage's got the solution as usual :)

[velvet yacht]

i think i've seen that and it looked sus

but um, I might try it as I am out of options

[uneven cloud]

That reddit thread you posted has a link to a marketplace plugin that exposes it to BP

[misty wharf]

"Combat System AI Framework NPC Behaviors Enemy Animations Universal Monster UM" well that is one long marketplace product name lol

[velvet yacht]

they do that on amazon too for SEO optimisation

[misty wharf]

Yeah just never noticed people doing this on marketplace lol

[velvet yacht]

lol there you go

thanks @uneven cloud @misty wharf

[uneven cloud]

It's probably just a BP function library that exposes the C++ functionality.

[velvet yacht]

ya fair enough I'll have a look into it, thanks again

[uneven cloud]

Looking at the nodes, they did it in a way that I wouldn't, but it doesn't look suspicious. Just naive, like most plugins

[hardy shuttle]

I'm still not quite sure what switching between tasks randomly means
For example, what if you have decorators that switch behavior (such as Actions which also include Play Montage) based on the amount of HP/Mana the enemy has?
Like this:

[celest python]

thats fine, what I mean is model your transitions based on prioritizations not arbitrary jumps between irrelevant nodes

thats when you start to abuse BTs

not arbitrary jumps between irrelevant nodes
this is something you understand when you end up doing it for some reason

[hardy shuttle]

Could you provide an example of this? Just curious what it might be

[celest python]

Imagine you have decorators per node and each you have a quite deep BT, you try to make BT snap to other nodes in the tree by manipulating the tag through execution flow instead.

Doing this for high level states, like RUN, FIGHT, PATROL etc fine - but you supply those states with some external data you set through world events and/or services. When it starts to look like FSM, its when you try to snap to a random node from a completely arbitrary node in the tree so it more looks like a sphagetti execution flow rather than a clean high level state to more specific behaviors BT design

The thing here is FSM can jump to any node from any node, while BT is more "top to bottom"

[coral mesa]

wait detourCrowd got a limit or something?

[hardy shuttle]

I think I understand, it should not look like spaghetti
Also, by FSM, is there a FSM thing that exists in UE that you can use instead of BT?

[celest python]

there is a paid marketplace plugin

LogicDriver

<notanadvertisement>
worth the price even if its expensive imo, my subjective experience was pretty good with author and the plugin
</notanadvertisement>

[celest python]

25

[coral mesa]

wait it is for only 25 agents?

[celest python]

you can increase it

its slow for PS4 like old patato hardwares, thats why limit exists

[coral mesa]

can i increase it like 2k+. feels like im moving towards totally custom avoidance solution

[hardy shuttle]

Okay, thanks for the clarification
I'll stick with BT

[misty gale]

Are you actually gonna have 2k actors that all are gonna mash and collide in a single group?

[dense owl]

Cause if so, good on you!

[misty gale]

For the setting its in Settings -> Engine -> Crowd Manager -> Max Agents

[coral mesa]

doing something like RTS games

using ECS

[misty gale]

I get that but 2k colliding/detouring at the same time sounds extreme

And is unlikely to ever happen in most rts's

Cant imagine more than a few at thensame time tbh (and surely thats what the limit is? Currently Active detours? )

[blazing reef]

What is the correct way of binding data in environment query generators? I am currently doing the following:

// As class member in header file:
FAIDataProviderIntValue NumberOfPoints;

// .cpp file
UMyQueryGenerator::UMyQueryGenerator(){
    NumberOfPoints.DefaultValue = 1;
}
UMyQueryGenerator::GenerateItems(FEnvQueryInstance &QueryInstance) const{
    NumberOfPoints.BindData(BindOwner, QueryInstance.QueryID);
    const int32 Num = NumberOfPoints.GetValue();
}

When I set the number of points now in my query request UMyQueryRequest.SetIntParam(FName("NumberOfPoints"), Num) this works as expected, however if I don't set it, the default (1) is not being used, instead the value is 0 returned from GetValue(). Why is that, am I binding the data incorrectly?

[toxic osprey]

for some reason my ai isnt moving and in the output log it says "LogSpawn: Warning: SpawnActor failed because of collision at the spawn location [X=-343.157 Y=480.532 Z=351.791]"
how do i fix this?

[blazing reef]

By either not making it collide or to set it to ignore collisions when spawning

[toxic osprey]

ok

i did, its still not working

[blazing reef]

You have to provide more information, based on your problem description, the provided answer is guaranteed to work.

[toxic osprey]

idk, they just stopped moving. the animations are fine but they are standing still. i made a print node to "on request failed " and it pops up whenever the ai spawn

[misty wharf]

Look in the visual logger

It usually has additional info on why moves fail

[toxic osprey]

i cant find whats wrong, i dont know how the visual logger is used

[misty wharf]

Open it, press record, then start play in editor

[toxic osprey]

i did

[misty wharf]

Look at the events it logged

[toxic osprey]

how?

[misty wharf]

In the window it has the markers on the logger window, click on them

[toxic osprey]

then what?

[dense owl]

Then read.

[toxic osprey]

damn. no reason to be so aggressive

[harsh storm]

There isn't really another step though

[dense owl]

I wasn’t, that’s literally the answer lol

Click on the frames, and read the log underneath, it’s just verbose enough to understand what it is saying

Usually just a matter of clicking the right marker

[velvet yacht]

is someone available to help me with a quick question relating to AI please

i want to know how I can handle a change a player initiates such as when a player presses a button the AI can't see them, but the issue I have is that this applies globally, so other players also cannot be seen

I want this change to only be applied to one player that is pressing the button if that makes sense, the rest should still be seen

i feel like i'm missing something and this should be easier

maybe i'm overthinking it

[novel snow]

can't really help you much without info on how you're doing it currently

[velvet yacht]

using ai perception

[novel snow]

can't it be a variable on the player character & the AI checks the state of that variable for each player separately or something

[velvet yacht]

the ai senses whether the player is within visual cone and BT tree state changes to follow

so what i am trying to do is reduce the visual cone to 0 but when one player does that, the AI becomes useless

i want the AI to keep chasing others

[novel snow]

don't reduce the visual cone then, add some additional step that checks a variable on the player or smth

[velvet yacht]

yeah but that is kinda what i am doing already

if the player sends a signal an interface picks it up and changes the vision

[novel snow]

as far as I can tell from what you said it isn't

[velvet yacht]

so it's an event on the enemy bp that activates the whole 'don't see me' process

[novel snow]

that's not the same thing as what I said

[velvet yacht]

but if that process is activated on the enemy, the enemy will not see anybody, but i want the enemy to just not see the player the called the event

if that makes sense

[novel snow]

you're disabling their vision entirely instead of filtering out invisible players from their active vision

[velvet yacht]

but what if i don't want to entirely disable it per se

like if i want to lower it to 100 units

i want to be able to adjust this value

based on what the player is doing

[novel snow]

player has "is invisible" variable, player changes variable when invisible, AI does its usual logic, cone vision, gets all players from that, for each player check if they're invisible + distance check to see if they're more than 100 units away or whatever, keep players that aren't invisible or are but are within 100 units

like, literally that sequence of event

[velvet yacht]

ok that makes sense, only thing i am not sure is how do i check distance? do i extract that from the sight function?

oh or should i use a line trace? seems a bit long winded but I guess that could work

[novel snow]

vector length of player world location subtracted from AI character world location

unless your characters are very large it should be good enough

[uneven cloud]

Adding an "is invisible" functionality is completely naive approach. You can just make that player no longer a sight stimulus source.

[novel snow]

that too

although he does want the player to still be visible, just at a lower max distance

[velvet yacht]

yeah like reduced vision rather than 'invisible' tbh

[queen horizon]

yo question, how can I incorporate AI to let the users generate their desired environment based on the user's inputs e.g in a airplane(doesn't have to be good/realistic graphics) with Unreal Engine or any other app/game development resources?

[uneven cloud]

How is that using AI?

[dense owl]

He’s prly thinking LLM

[potent loom]

text to airplane game

[dense owl]

Yeah, make GPT hallucinate code that doesn’t work

[west gorge]

Performance wise, is this amount of blue okay or should I consolidate?

I'm not seeing much CPU thread load so far but my CPU is pretty beef and may hide performance impact on reasonable systems. 🤔

[misty gale]

If only we hade a more objective metric

[west gorge]

I mean the reason I'm asking is because I don't know the answer so a sarcastic reply doesn't help me 🤔

[celest python]

It doesnt look like it will hurt, but you should always profile to be sure

CPUs and compilers are extremely complex so you always get surprised after profiling

[west gorge]

It doesn't cause a noticeable spike in my CPU thread stats, but not much would and that doesn't tell me about the performance on a typical system. 🤔 Maybe 1 ms really means 5 ms on a laptop CPU and the game is unplayable.

[wise sluice]

Are you planning to deliver a build on PS4 / Switch?
Else what i learned from profiling is that :

• Blueprint execution is far more expensive on ps4 compared to c++
• Ticking logic can hurt a lot when made in BP

[west gorge]

Decorators technically tick, but apparently they use special logic so they don't tick every frame? 🤔

[wise sluice]

I don't remember BT that much (i'm only using StateTree right now)
But if that's a kind of event based decorator, it should be ok i guess

I remember having used Decorator in my previous project and it was ticking each frame

However there is maybe option on the node

[prisma sun]

I'm learning a lot nowadays in StateTree, should I make my AI with StateTrees or BehaviorTree
Making an RTS game and with a lot of AI / units, and StateTree is making more sense for me, I don't like blackboard with behavior tree

Also if you have some example of StateTree and transition Patterns to share ❤️

[west gorge]

I looked into state trees but it doesn't seem able to fetch variables from actor components so that's awesome and totally not useless.

[misty gale]

It wasnt sarcastic, but i can see it being read that way 😅

StateTrees seem powerful. Havnt gotten into those yet

It seems easy enough to debug tho, contrary to my own custom clunk

[misty wharf]

They can do it just fine

[misty gale]

Anyone compared them for speed? 😅

[misty wharf]

ST's seem fairly performant and in general performance focused at least when using C++ based tasks

I've never really had any performance issues with BT's that weren't easily solved though

[misty gale]

Good to know 👌

[west gorge]

How 😮

[west gorge]

All I'm seeing is specifically the movement component and actor properties, none of my 10 actor components are in here. 🤔

Context is set correctly

And the only actor component I can see is this one. 🤔

[misty wharf]

Ah, yeah I'm not sure if you can really do it that way, but if you make custom tasks or such they can grab any data you want

[west gorge]

😦

Hm, here's a thing I would have to do with state trees that I don't know how to do without persistent storage of variables:

• The character is in Peaceful state.
• When a player controlled actor gets within line of sight, it goes into Alerted state and takes that actor as a Target.
• As long as the actor is Alerted, the Target can be changed by external logic (eg. taunts).
  I want to switch to state trees to reduce clutter but I don't see a way to do this with the current state tree system. 🤔

It seems I need two evaluators with the same output variable (impossible?) and a way to affect the output of an evaluator based on an event (ugly?)

[wise sluice]

@west gorge
I have an unreal subsystem hooked on the perception event of all my loaded AI
Each time the AI perceive something, it goes through a target selection algorithm and update the current focus

In my statetree, i have an evaluator that listen for target focus changed from my subsystem

[west gorge]

googles "Unreal Subsystem"

[midnight scroll]

Has anyone ever done dynamic navareas? ATM I mostly just need a navarea following a spline, and I'm not too keen on the idea of spawning meshes along the spline to manage it. I was kind of hoping that DynamicMesh or similar would be able to use them to avoid having so many objects on a larger map.

[misty gale]

^ i ended up with invisible iisms

Worked like a charm. Dirt cheap

But annoying that spline mesh didnt work

[celest python]

side note; anything that relies on you to parallelize game logic will be slow to run UE on it btw

all consoles expect you utilize cores properly and spread your logic so their single threaded perf is terrible

thats why BP runs slower than usual on them because it suffers from cache coherency penalties and branch prediction terribly

[celest python]

raw BT execution will never be a problem

the content you have in tasks will cause overhead

and default tasks are very unlikely to cause issues

BTs in UE are "overoptimized"

[midnight scroll]

Yeah, I noted that myself. :/ Blew an hour trying to mess with collisions and settings on them. I would really love a version for DynamicMesh because I literally already have code set to cut out a perfect path for it. Were you spawning the ISMs at runtime btw? I'll have to try this a little later. Sidetracked on another task atm.

[misty gale]

Yeah at runtime , along the runtime spline

Think it was just 100uu cube every 100uu of spline or smth

Pretty straight forward

[west gorge]

I realised you can't modularise state trees without C++. 😦

[misty wharf]

"modularise"?

[west gorge]

Like a subtree "patrol" you can reuse in multiple state trees for different enemies

[misty wharf]

Ah

It's coming in 5.4

[west gorge]

😮

[dense owl]

I wonder if this explains why my navmesh is not generating properly past a certain height:
[2024.04.14-22.38.27:670][905]LogNavigation: Error: RecastNavMesh-Default> Failed to add tile (0,0:5), 16 tile limit reached! (from FRecastNavMeshGenerator::AddGeneratedTileLayer)

[dense owl]

idk why it says 16 tho

it's definitely that, but nothing on google about this, just people talking about 32km landscapes which doesn't apply here

[uneven cloud]

Did you make some weird changes in the project settings for tile sizes?

[dense owl]

nah, I hadn't touched the tile sizes, and this error just magically appeared in the output log when running the game, but then after testing with different cell sizes and reverting those values to default, it went away. But the navmesh generation height restriction issue didn't. Found some people on reddit saying it's because of cell height and changing that fixes it, but that didn't work either, it just pushed the navmesh above the floor more

[dusky lodge]

Is there any specific reason why I would be seeing Navmesh Islands appearing inside Geo?

How do I combat that?

[uneven cloud]

There's a check box for the mesh that is something like "fill geometry inside for navigation".

[dusky lodge]

Interesting, ill take a look

Thanks.

[green epoch]

I have an ai controller and behavior tree that is mean to have the ai chase a player around. Its working on a pawn but bc i could not get the pawn to focus nor rotate. I was going to update that ai to be a character. When i changed it to a character the ai stopped working. However, it is still working on my pawn ai. as far as i can tell i retraced all my steps correctly. Does anyone have any idea why this could be happening? bc my prototyping map is made out of two differnt platforms, with differnt collision channels, ive been testing it on the two differnt platforms. on a simple actor it will chase once and then stop, whereas the pawn will continue. whereas on a custom platform with this collision channel it wont follow at all.

[uneven cloud]

The nav mesh will not build on a mesh with those collision channels

[green epoch]

i thought it was building because the object in shaded (Im fairly new to nav meshs so im not really sure, sorry)

what would i have to change so that it builds on that object while still ignoring pretty much everything i can

[terse panther]

Hey there everyone...
can someone suggest me a good way to set a blackboard value after a certain time after finishing a task...
like i have some BB values that i want to set true/false after a certain delay( AI is accessing delay value from their data asset) depending on the tasks the AI is currently performing …

my current solution is that I created separate timer for each value inside of AIControler (which i guess a bad idea)

[abstract yarrow]

Hey can anyone help me fix my AI? He worked fine in a test environment but I had to switch over to a nav mesh invoker system to reduce lag

[abstract yarrow]

.

[abstract yarrow]

this is what's happening right now

[keen crow]

Remind me please how do I run eqs query outside of AI actors? I want to use it to find good camera positions for dialogue between player and NPCs. I remember it was very familiar to code of the BTTask_RunEqs, but I think there was some differences regarding how to catch the result of the run EQS

[misty wharf]

You just use the Run EQS node or whatever it was called. It returns the query BP wrapper, on which you have to bind an event to Query Finished or whatever the event was called

[keen crow]

yeah I forgot to mention I need it for cpp. I guess I'll just look what's inside of BT wrapper

[west gorge]

Do your navmeshes touch?

[abstract yarrow]

I'm using one large nav mesh bounds volume in my persistent level and my enemy AI blueprint has a nav mesh invoker component on it @west gorge

[placid halo]

I'm trying to debug why we are able to get the BT MoveTo task to actually go to an actor that has navigation collision (thus making a hole in the navmesh), whereas using the "Move To Location or Actor" doesn't give the same result (and the projection to navmesh fails because the Extent is always set to 50,50,250). And it seems like the BT MoveTo sets the FMoveRequest::bRequireNavigableEndLocation to false, whereas the UAITask_MoveTo doesn't set it anywhere. Is that right?

mmmm.... UE_DEPRECATED(5.2, "Please use FindPath with the added bRequireNavigableEndLocation parameter (true can be used as default).")

[placid halo]

argh! https://github.com/EpicGames/UnrealEngine/commit/43dcae9b48c7eb434e1e4b196810966e2c91ca2e
I guess we need to update to 5.4...

[misty wharf]

If that's all you need you could fairly easily just expose it yourself

Just make your own node for it

[placid halo]

yeah, looks like it. We need some weeks before we can upgrade to 5.4. Also would be best to wait for 5.4.1

[misty wharf]

Yeah I'm probably not gonna bother with it until .1 either, tends to have all sorts of oddities in the initial one which get fixed in .1

[west gorge]

Is it dynamic?

🤔 In what ways are state trees actually better than behaviour trees?

[keen crow]

they are not.

[placid halo]

You control your blackboard and you don't have to have a variable with the name of the blackboard variable to set BB data and get BB data

[west gorge]

Do state trees even have a blackboard equivalent? 🤔

[placid halo]

no

but you can "kind of make" a blackboard using an evaluator

[west gorge]

Is the fact that parameters are read only a bug or feature? I currently have some blackboard variables that are set by multiple services in different branches of my behaviour tree as well as externally, and I don't think you can do anything like this in state trees. 🤔

[placid halo]

you can use an evaluator to get the variables, then anything in the StateTree can bind to those variables from the evaluator (as long as the variable is set to the "Output" category, case sensitive). I didn't find a way to set variables or call functions on the evaluator from the outside though, which would be very handy

[west gorge]

For example, "Target" is:

• Set to the aggroing opponent in the PatrolAI behaviour tree, and retained in the blackboard during the switch to CombatAI;
• If melee attacking, runs a service with % chance per tick Target is switched to the nearest opponent if it is nearby and the original target is far away
• If ranged attacking, runs a service with % chance per tick Target is switched to any opponent within cast range that is using an ability worth interrupting
• When the character is hit by an opponent, one of the hit consequences is a % chance Target is switched to the attacker
• Confusion debuff changes Target randomly and forces it to not change for the duration
• Attract debuff charges target to a specific character and forces it to not change for the duration
• Voided if the Target is gone or dies, at which point it should either switch to the nearest opponent or if none is nearby, leave combat.

Most of this would require one hell of an evaluator and some of it would be impossible, or am I wrong about this? 🤔

[placid halo]

well, you can split up evaluators, and you also have global tasks. And it seems a lot of that should be calculated under a given state/task/condition. It still sounds doable, it's just a bit of a change in the mentality/approach to the problem. In the end both BTs and STs are tools, you just need to pick the best one for the job. 🙂

[west gorge]

Wait, you can have limited scope evaluators? 😮

[placid halo]

in my case, the whole string based get/set variable of the BB was really confusing and error-prone for designers, STs just felt more straight forward in every aspect (except the "set something on the ST"). you can of course get the variables on tick, in our case we only do that when a pointer to a given object with the information we need changes.

[placid halo]

yes, you can have states that are only "information gathering"

[placid halo]

@misty wharf has some good info here: https://zomgmoz.tv/unreal/State-Tree/Custom-StateTree-tasks

[west gorge]

@placid halo Big thanks for the link and @misty wharf for the content ❤️

[verbal shore]

Based on my experience, State Trees are great for AIs that could benefit from transitions between behaviors. Let's say you have an AI that can sit on the chair and also run away from the enemy. You can directly control the transition from "Sitting on a Chair" to "Running Away". This is difficult with Behavior Trees because of its nature. You would end up something extremely weird.

I began testing State Trees two weeks ago and realized that my AI characters could really benefit from it, especially I like to have control over the design, and want to be more deliberate. I've made the switch and I'm quite happy with the results. It's really powerful and have some really cool features.

But everyone's needs are different, so I wouldn'T say State Trees are necessarily better than Behavior Trees.

[misty wharf]

🤔

What a strange bug if it really works that way, it seems the copy paste function should be the same regardless of whether you use keyboard shortcuts or the context menu

[uneven cloud]

Invokers don't fix perf issues, they cause them.

[abstract yarrow]

Oh fr!

At first I was making smaller nav mesh volumes in each of my sub levels and the lag was atrocious

Switching to the invoker way did make level streaming faster but my AI is broken now

[uneven cloud]

I recommend looking at the code for the run EQS AI task. You need to bind to the delegate before running.

[uneven cloud]

What is it that you are trying to do? Not how you are trying to solve it, but the behavior you are actually looking for.

[uneven cloud]

Transitions out of sitting in a chair is extremely easy. You don't put that logic in the BT, but in the sitting functionality.

[uneven cloud]

Yes. Generating the nav mesh is actually really expensive. It's even worse when you have it on a moving actor. Every time that actor moves, the nav mesh needs to be rebuilt.

[verbal shore]

Yes, I could probably give a better example for that. Getting up can be done while aborting the task easily, but there are sometimes different scenarios where you need to switch to an entirely different task, and from there, move to another one based on certain conditions etc. That's I believe much better with State Tree.

[uneven cloud]

Nav mesh streaming, if set up correctly, does not cause performance issues. Lag and performance problems are very different things. Navigation has nothing to do with lag.

[abstract yarrow]

Okay. I guess lag isn’t the proper term then. I’m experience severe fps drops and it becomes impossible to navigate the space. It usually happens when new levels are streamed in. That and the AI are separate problems though I’m assuming

[misty wharf]

You should probably run Unreal Insights to try and find out what's happening

[steady quartz]

Hi! Im in unreal 5.3., and using a blueprint enviroment query context to provide a single location ALWAYS returns an invalid location, no matter if I manually set the location. Does anyone know if it is broken in 5.3?

Also, I put a custom eqs in a eqs testing pawn with said context, and no points are drawn in editor.

Note: it works fine if I use the provide a single actor function

[abstract yarrow]

Okay so I was able to figure out the enemy AI naviation. Turns out I had the nav mesh bounds way too large. I didn't realize they were already pretty huge by default

Now I'm having some serious performance issues that I haven't been able to figure out with Unreal Insights.

You can see it start becoming unplayable at 0:59

[uneven cloud]

No one can tell from a video of your game what is causing your performance problems. You need to learn how to use the profiling tools.

[harsh storm]

And this doesn't seem to be a question for #gameplay-ai, but instead #profiling

[terse panther]

ok what i am trying to do is after switching the cover or after finished firing, i want my AI to wait for a certain time(each AI type has different delay time), to again ask for the permission to switch cover or for fire....
i do have a ticket system for this and each ticket has its own timer, but i also want to make a timer for the AI, so that other AI can get a chance to fire or switch cover,

[half kiln]

is there a way to enable AI debug in Simulation?

[wise sluice]

In 5.4 you'll have substatetree so yeah

[steel moat]

Ive made an AI detect player and follow system. At first AI is randomly moving until it detects a pawn, when AI detects pawn it starts following it and starts shooting, now idk whats going on but ai stops following player and goes on moving randomly again, when its withing the acceptable radius, I cant reduce the radius cuz I want AI to be in certain distance only. What i wanna do is when pawn not in sight AI is moving randomly and when its in sight AI should follow and shoot the pawn, when AI is withing the acceptable radius it should stop following but keep on shooting while facing the pawn

can anyone guide me through it

[pearl fern]

Hi all,

Is there a way to bind to a state tree event; for example inside a state tree evaluator?

I want to update a certain variable only at given moments and I have not found a clean way yet.

To be a bit more precise: I want an AI to store a location (e.g. where it heard a noise) once, and then in a different state I want to make it move there.
But I can't share data between state siblings and if I parent the states, the execution does not work how I envision it.

But if I poll the variable constantly with an evaluator, it also leads to weird behaviour

[uneven cloud]

Why don't you just use the cool down decorator? If it needs to be a variable time wait, it wouldn't be hard to make your own that takes in a blackboard key instead of a set time.

[terse panther]

yeah i guess making custom cooldown decorator will be a better idea than sending things to controller...
I'll try it and see if it works with me

[misty gale]

How do you draw the line of what goes into the BT/BB compared to having it in the pawn ?

Feels like I'm choosing between multiple decorators and BB keys, vs just doing the logic in the pawn and calling a simple function ..

like this part;
Why would I have this decorator vs having the rangeCheck inside the BTT ?

The Attack is gonna do some extra checks aswell.. I could move them all out to decorators i guess, but I'm unsure why i would do that .. doesn't seem all that sensible to me

I lean towards just having the checks inside Attack in the first place .. using decorators for broader things...

Like checking if we even have a target at all

[upper terrace]

Hello I want to know how many ai can we control with behavior tree? Because I made a function in which ai follows me and i change the blackboard variable value from ai controller to make ai follow me and unfollow. But when i have more then 1 ai in the map then only 1 ai follows me

[uneven cloud]

AI logic should never be in the pawn. The pawn is the body that executes actions.

[uneven cloud]

You can have as many as the perf allows. Something is broken with you follow logic. What have you done to debug it?

[harsh storm]

So, I'm going to respond to all of your stuff. BT is what decides what should be done. Pawn is what decides how to do it. Controller is what is used to provide information about the world. That's how I separate things.

The reason you want the decorator on the sequence node and not the attack task is because the decorator prevents the sequence node from executing. Where as the task would not. So if they're not at the target, it would keep trying to actually attack. Because the BT will see that it can go into the Attack Sequence.

[misty gale]

Right, that makes sense. So i guess instead of polymorphing the attack conditions in the different pawns id rather try to make some generic decorator using something like a bool which the aiController pushes to the blackboard (which ofc allows me to polymorph it anyways)

[upper terrace]

Not anything yet, I have been checking when I open the behaviour tree of another ai instance and when I click to change variable value then it doesn't change in that ai character instance only in the first ai character that spawned in that only i can change the value of blackboard

[uneven cloud]

Use the visual logger to debug it

[vivid basalt]

Hi, is anyone familiar with StateTree? Can I separate a subtree into a different statetree asset?

And when I editing statetree, it is very easy to crash, sometimes just by adding a debug text task.

[misty wharf]

This feature is coming in 5.4

[vivid basalt]

nice! seems i'm catching up with the era. my tree now is really nested too much~

[pseudo solstice]

Hey everyone!

Apologies, this might be a super dumb question but:

Is there a reason why the EQS query points don't show up in my Visual Logger session, despite being recorded? I'm doing the Tom Looman C++ course, and I'm unable to figure this one out so far.

Is there a specific setting I must toggle perhaps? I just wanna see the query points while scrubbing the timeline. Everything else shows up.

[amber saddle]

Are there any tutorials out there or videos that anyone knows about, to do directional attacks? I was thinking I could use EQS to test and see if my player is beside my enemy character and if they are, to do an attack from that side.

[pseudo solstice]

I found the solution. EQS query points, being viewed from the Visual Logger, only show up when Game View is enabled. Awkward.

[upper terrace]

Oh yeah I have used it, it shows only the very first ai that spawned have the blackboard variables and only that ai follows my order and the rest of the ai instances doesn't have my blackboard variables or the variable value isn't changing when I'm pressing the key

[dense owl]

Sounds like you didn’t use it and just repeated the same thing you said prior

[cosmic gull]

Where can i specify the playerstate class to use for my AIController, after enabling bWantsPlayerState? Similar to how you set the default player state in project settings for human players.

[steady quartz]

Hi everyone. Has anyone else had problem with Environment query context that provide a single point and are also called via a service? For some reason, it always returns an invalid location

[uneven cloud]

What do you mean by "when I'm pressing the key?"

[uneven cloud]

No. I have not had that problem. Show your context.

[steady quartz]

The context is just returning the player's location + a custom offset (I don't have the project with me right now). It is not complicated logic

but calling it via a ticking service makes the eqs not work

Hell, just putting it on my eqs testing pawn makes the points don't appear.

[uneven cloud]

You're looking to see if it's an engine bug, but it is not. There must be a flaw in your logic.

The testing pawn doesn't work very well, especially when you are using runtime logic for contexts.

[steady quartz]

Okay Okay. But, the thing is, If I change the context to provide an actor, not a single location, it works fine. That's what's giving me a headache

[upper terrace]

When I press the key I change the boolean value which is located in ai controller so first I use get actor of class to get ai controller then change the boolean value, and in ai controller I get blackboard and the set the value of boolean in it

But I found the solution I need to use get actor of all class to make that boolean change value on all ai controller instances, I haven't tested it yet but I will do later.

[uneven cloud]

Yes. Getting actor of class will only give you the first one, not all of them.

[upper terrace]

But I want to ask if I use get actor of all class will it not make load on processor

[uneven cloud]

What do you mean by make load?

[upper terrace]

But I'm not going to loop it I'm just going to click few times throughout the game so it won't matter

[upper terrace]

Like get all actor of class will make whole ai controller come in my player bp it's same as cast node. So it will fill up more memory

[uneven cloud]

Not any worse than get actor will or a cast.

[abstract yarrow]

Sorry I know you guys dont like when I upload gameplay vids but I'm having trouble figuring out how to fix my enemy AI being stuck on doors in my game. I'm using physics doors so I was hoping he could just run through them but it's not working and I'm not sure what to change

I can post my code too. I'm using a behavior tree

[uneven cloud]

Showing your video tells us nothing about how it works. Showing us code that has nothing to do with doors also tells us nothing. How are you handling logic with doors?

[abstract yarrow]

I'm using a physics door system that allows the player to just walk through the door instead of having to push interact

I'm using a lock and key system that I made but the door the enemy is stuck in is aleready unlocked so that's not the problem

I put them in a test environment and it seems like he won't go through door at all

[abstract yarrow]

I figured it out y'all. I just had to add a nav link component to my door blueprint and he'll go right through it. My last hurdle is figuring out this severe fps drop when I'm entering the level that has the enemy spawned

[steady quartz]

If anyone wonders, after looking at the engine code, the query generator that I was using, a cone, does NOT allow the use of points for a query context. Only actors. Changing the generator to a donut solved my problem

[dense owl]

Do some #profiling to find out what is slowing you down

[nova cargo]

having an issue with AI Perception, these are my settings, however when running it they all go back to the default settings, any clues as to why this wouldnt work?

tried restarting UE but still having the same issue

[lyric flint]

Hey guys I created blackboard variable and try to set a default value as 1 but there's no variable to set default value on blackboard how can I set it ?

[uneven cloud]

You can't set a default value. Blackboard values are either set or unset.

[lyric flint]

ahh got it

thank u for answer 🙂

[nova cargo]

Is there any plugins that need to be on for ai perception to work properly? I’m really confused why the settings are not doing anything at all. I did find an asset on UE marketplace that gives the ability to change these radius/range settings during runtime but don’t believe I should need that to get this to work…

[dense owl]

No. Did you put stimuli sources on your targets?

[nova cargo]

Yes all of it works as designed, just seems to only want to use the default settings of the senses.

[dense owl]

Where is your perception component ?

[nova cargo]

On the enemy pawn. And the stimuli is on the player pawn.

[dense owl]

No

Perception component needs to go on the AI controller

And you need to make sure the enemy pawn is being possessed by the correct AICon

[nova cargo]

Ok I will look into that a bit and reply

Great, Thanks! It turns out that was the issue. I had two perception components. Works 😁

[misty gale]

Anyone used EQS for simple 3d movement?

[fleet coral]

In a top down, zelda viewpoint style project, what's a good scale for the main character and AI agents to avoid navmesh generation issues?

My world used to be way too large which caused lighting and shading issues. I'm working to reduce its size now, and scaled things by quite a bit. I'm finding my new scale to cause issues with nav mesh generation, as I'm hitting the floor of the system's numerical ranges for cell size, cell height, etc.

[crystal hatch]

You've literally scaled down your content to avoid lighting issues? Sounds like a catastrophe waiting to happen. Are you using World Partitions?

[fleet coral]

Not just lighting issues, everything was overblown in size which led to all sorts of other issues, it's something I've been carrying for a while being too lazy to address.
It's just a prototype so no worries for now, I'm just looking for the right scale.

[crystal hatch]

The right scale is 100uu == 1 meter. Most of the engine works with that in mind and even if you can change the scale that's the scale the engine works best in.

[fleet coral]

Yeah I see, the thing I'm looking for is the upper and lower limits of an object's size from which it'll begin to cause issues when interacting with various systems in the engine.

For example if I scale things too small, they hit the lower limit of the navmesh parameters and cannot be detected to be included in it, even if I lower cell size/cell height. Or for lighting, once things are smaller than a certain size they get excluded from the shadow map.

There are probably commands which fix some of these issues but I'd like to choose a good starting point for scale so I have to deal with as little of that as possible

[misty wharf]

Changing scale used to cause all sorts of physics jank in UE4 so just a word of warning lol

It appears Chaos is a bit better with it as far as I can tell but I also haven't tested it quite as much

[dense owl]

Wb Mieszko 👋

[crystal hatch]

I was never gone 😉

[dense owl]

Haven’t seen you in this channel much, figured you’re knee deep in #mass 😀

[crystal hatch]

neck-deep in actual Mass work 🙂

[dense owl]

That’s what I meant hehe

[narrow mason]

Is it possible to execute navmesh movement without a controller possessing the pawn? I need the pawn to use acceleration for path so it turns to face the movement direction.

On a related note, I'm working on a RTS project with lots of units. What are the implications (performance) of each unit having an AIController vs not having any? At the moment, the only thing I need the AIController for is navmesh movement

[harsh storm]

Pretty sure you just need a path following component. I don't think the navmesh stuff is directly tied to AIController. Could be wrong though - never looked/paid attention

[narrow mason]

Yeah, I've gone through it. There's a some stuff that it gets from the controller, but the controller in turn gets them from the pawn.

So, I can make a custom path following component and skip all the stuff I don't need

[celest python]

you dont even need PFC

you just need a function to query navmesh

UNavigationSystemV1 -> FindPathSync or something

then do whatever you want with TArray<FNavPoint> it gave u

@narrow mason

[narrow mason]

Hola!!

[narrow mason]

This is what I ended up doing 😅. I'm just going through PFC to see if and where there's any avoidance implementation

[celest python]

avoidance as in steering implemented in ucrowdfollowingcomponent and CMC (rvo)

[narrow mason]

Yeah, specifically the CMC rvo

Making an RTS is impossible in UE 😂

I have to do a lot of custom stuff.

[dense owl]

Google Manor Lords

Homeworld3 is also apparently made in UE

[narrow mason]

Oh yeah, I'm exaggerating a bit 😅. But it's hard AF

[dense owl]

That it is

[misty wharf]

It's probably the same challenges that exist in all engines when it comes to something like that

Although I think UE has some issues of its own in particular with skeletal meshes and component transforms that I hear perform rather poorly due to dubious design decisions

But I kinda get the feeling that all engines probably end up having some of their own issues

[narrow mason]

I don't know the engine well enough to use it as a plain renderer. But I've moved most of my logic to use flecs ECS, so performance is looking quite good.

I'm only using Actors for interacting with the world: traces, navigation, collision.

All other game logic is on ECS, including AI

I'm still having some issues with multithreading and non-threadsafe UE objects cause I'm using plain OS threads. But I'm hoping UE Tasks can resolve that issue. Just need Megafunk to help my life 😂

[uneven cloud]

What does using acceleration for paths have to do with a controller not possessing the pawn?

[narrow mason]

I thought that was controlled by the controller (pun unintended). But it's a movement component thing.

Although, digging through the PFC code, shows that a bool property on the controller influences whether the pawn faces the path direction

[rocky finch]

Do behavior trees tick every frame?

[haughty tide]

Cannot really tell, but based on the BehaviorTreeComponent and the ScheduleNextTick function, it appears that the interval is not directly next frame but rather a very small number close to zero. However there are cases where ScheduleNextTick is called with a zero float param so that may be called directly next frame.

[dense owl]

I think you change how often they tick but I can’t rmbr

[solid wedge]

Ive heard many say behavior trees are very suboptimal by default compared to custom "go here, do this" code. Wondery why

[dense owl]

Many, eh?

If you use a hammer to staple papers together, it’ll likely be “suboptimal”.

BTs are great for what they’re made for

[uneven cloud]

You heard very very wrong.

[uneven cloud]

They can tick every frame, but they don't have to. Often BT tasks are set up to trigger an action and wait for it to end. Such as the path following to a location or an animation being played.

The search for the next task only happens when it's ready for a new task.

[solid wedge]

https://youtu.be/UBYc-eCRGRw?t=21m51s

[potent loom]

Yeah, the unreal behaviour tree is very expensive for what it's doing. That's an unreal thing though, not really a property of bt's

My hand rolled solution that basically does exactly what he's describing, go here, play animation, is about 100x faster

[misty gale]

Is it tho? Very expensive? Comparing it to a very specific implemenration to achieve 1 single thing is ofcourse not fair

[misty wharf]

Very expensive? Hardly

[misty gale]

Ill see how it fares on my next round of my citybuilder. Using it for a few thousand npcs might be overkill , dunno

[misty wharf]

As long as it isn't constantly searching it seems it should perform fine

[harsh storm]

Pretty sure she is responding to "Ive heard many say behavior trees are very suboptimal by default". Yes, if you have a simple "go here, do X" thing, a generalized solution is going to be "suboptimal".

Of course, doing the simpler approach has its own cons as well

[solid wedge]

Yeah, my use of the term "sub optimal" a bit too broad. I meant purely based on raw cpu frame time with basic logic.

Interesting topic regarding the tick frequency though. I would hate to have a game so grand that I would need to resort to c++ to enable hundreds of ai on screen. Im very happy with behavior trees and traditional methods for my own use case of 31 ai max at any given time.

I wonder if nanite & nanite tesselation interferes with navmesh & normal detection? Oh well, thats research for another day. 🫣

[misty gale]

Sub-optimal is a fine term imo 😅 any generic solution for anything is seldom the most optimal one

No-one ||a select|| few expects the submergible flying boat car to be the best at any of those 4 things

[pseudo solstice]

Hey!

I'd like to ask a quick question about the "Cooldown" decorator.

In UE4, it did not start with it being on cooldown (as others have told me) but in UE5, it immediately puts itself on cooldown, as soon as the game starts.

Is this a bug or the expected behavior?

According to the hinting, it should only put itself on cooldown after execution, but that doesn't seem to be the behavior

[misty wharf]

This is how it's in UE 5 and it's weird yes. I think in 5.4 they're adding settings to it so you can choose the behavior you want, at least I vaguely recall seeing someone mention this

[zealous maple]

Hello! I'm currently trying to make my AI reset without destroying them when the player dies. So an AI with the player as a target doesn't still chase the player after death (I never destroy the player but teleport them back).

What is my best way to reset a BehaviourTree and all it's variables?

Would it be to have two different ones?

E.g.
BT_Inactive, just stands there, no logic inside of it really
BT_WhatEverEachAIWillDo, and this is the one they should use and will make them do their actions

My suggestion above only works if switching between BTs is resetting them though.

Or can someone help me with an idea how to solve this and the best way?

[misty wharf]

Why not just set the blackboard values to some default values that make the AI behave as it does when it hasn't seen the player?

[zealous maple]

Hmm, I was thinking I could do that, but it would mean that I need to have a reset function that is special for every AI type. Which might be the best solution. That is what I'm currently trying to figure out to be honest.

Or if there was an easy way to "just" set them back to to their inital value, without doing it per type. I'm fine with that solution though if that is the best way to do it,

[misty wharf]

Do all of your AI types have their own blackboards?

[zealous maple]

Not all of them no. Only some special ones. most of them just use the generic one since they all have similar stuff. E.g. IsChasing, HasSeenPlayer, Attacking. So most does not.

Now that you mention it.

[misty wharf]

Right, so you could just have some base class which has the logic to reset the shared ones used for player detection

[zealous maple]

Yeah, so that sounds good. Didn't think about that.

I mean, that most of them share it

[misty wharf]

You could have a base blackboard also and inherit the others from that to make the sharing more straightforward

[zealous maple]

Since I also have a ParentEnemyClass they all are based on it would be quite simple to add it there, and only overwrite it in the special ones.

Yeah, I have a base blackboard

That the special ones also are based on.

It is only for the bosses, they have special blackboards, since they have some special variables and such I want to use, and they are only used for them. So it would really only be the boss that need special reset.

Thanks! Sometimes it's good to just hear someone else say, but why do you want to do it this way, when you could just. 😄

[misty wharf]

hehe :)

yeah I think this would probably be a fairly good solution

this would also allow you to override the function if any class requires additional reset handling

[zealous maple]

Yeah! Sounds like a good solution

[misty wharf]

I kinda get the feeling there might be a way to collect all the defaults from the BB at the start and save them and just have it reset those back automatically but that'd probably require some C++ hackery and I never looked at that myself at least

[zealous maple]

I mean I need the reset function anyway. Since I need to reset health, position and such, so they all go back to there they should be.

So adding the BB values is not really a lot of work

[misty wharf]

Makes sense

[lyric flint]

Hey guys, I created a ai for example like moveTo playerLocation, but I wonder what if it's multi I mean I'm retrieve player location using this method getPlayerCharacter(index : 0) but it's only for one player right? how can I move To nearest player? (calc distance from them and if it's middle run any skill and move again to target)

[misty wharf]

get list of all players chars and see which is closest

EQS for example can do this fairly easily or just create some custom code for it

[lyric flint]

Ahh it was EQS I already made it as decorator😂

[zealous maple]

I have a problem I keep running into and I feel there must be a solution.

I use the MoveToActor node, and I have a flying enemy that is using that flying through walls and everything, and should hit the player. BUT, when the player is standing still, it stops right before the player, even though the AcceptanceRadius is set to -1

But if the player is running away or towards the enemy it hits. So it is only if the player is standing still. Does anyone know why that is the case and if there is a way to fix it?

I just set the "stop on overlap" to false and that might have fixed it, but I don't know if that is a correct solutiuon

[green loom]

What is this flat node beauty? A plugin?

Also, I do have another question... I must be daft, but I have a very basic selector. When the condition is false, it does not go to the second branch. What am I missing:

Oh because inside the selector it doesn't care about the blackboard condition

[misty gale]

Electric nodes, yeah

[green loom]

Cool thanks!

[harsh storm]

Well, UE is designed in such a way that you will need to go to C++ for that kind of level of AI anyway.

[potent loom]

Yeah, if you implement a custom BT yourself it's significantly cheaper. BT conceptually is very efficient structure, but all the UE overhead makes it less paletable.

Generally ai is not your bottleneck though, you'll choke on the actors walking before the overhead of BT's become a problem

[lyric flint]

Hey guys, Im trying to get distance from players how can I getting distance?

[dense owl]

https://docs.unrealengine.com/4.26/en-US/BlueprintAPI/Utilities/Transformation/GetDistanceTo/

[lyric flint]

Hmm what if player is more than one?

[dense owl]

Well you seem to have the right idea with the EQS query but you have it set to search between 0 and 0…

[lyric flint]

wdym exactly between 0 and 0?

[dense owl]

Look at your own screenshots

[lyric flint]

oh yeah

all the points just returning distance(0)

[stoic pier]

Say you want a BTTask to wait for the duration of a montage played via interface in the AI character. How would you handle this? The task calls the function in the character, plays the montage, but not sure what the best way to get back to the task and trigger succeeded is 🤔

[misty wharf]

Interface functions can take delegates as parameters, and at least in C++ I think they could also return a multicast delegate you can bind to

But delegates in general would probably be the best way to go about it. In Blueprints doing it might be a bit iffy through interfaces tho

[stoic pier]

interesting, haven't tried this king of approach yet but let me see if I can get my noggin around it. Yeah this is in cpp btw

[misty wharf]

Yeah I think that should work alright then. If you declare a delegate using one of the DECLARE_DELEGATE macros you can pass those around like regular values, or use std::function even

I vaguely recall there's a delegate on montages you can bind to and fire your own delegates from it if needed

There's also a bunch of engine code which uses DECLARE_MULTICAST_DELEGATE, and wraps it in a getter function, so a similar approach could probably be used with interfaces to return a multicast you can bind to if you prefer that approach

[stoic pier]

yeah I was doing something similar here, just found this bit

        AnimInstance->Montage_Play(DeathMontage, 1.f);

        FOnMontageEnded BlendOutDelegate;
        BlendOutDelegate.BindUObject(this, &AAIEnemy::OnDeathMontageBlendOut);

        AnimInstance->Montage_SetBlendingOutDelegate(BlendOutDelegate, DeathMontage); ```
So I think I can leverage something similar.. what I'm not sure about is ExecuteTask has to return the succeeded so how do you get that function to wait ? Or am I missing smth?

[misty wharf]

iirc there's a value you can return to indicate it's running and you can call something to finish it later

I'd look at the builtin BTTasks like Wait to see how it works

[stoic pier]

ah ok cool, that should work then

[pseudo solstice]

hey y'all

https://gist.github.com/rolandsarosy/2bf226eb260d8cf212ca2cff2a082146

I've made a forked version of the UE5.3 BehaviorTreeDecorator that fixes the issue of it starting prematurely on cooldown, even without invocation.

Feel free to grab it if you need it.

It's 99% the same, I've only fixed the NodeTick and RawCondition issues, and fixed the const-correctness in a few places. Hope it helps someone.

[misty wharf]

Nice :)

Hmm... that's a bit of a gotcha... it seems that if you use "project goal location" with MoveTo, the acceptance radius is still to the Goal Actor rather than the projected Path End

I would definitely expect the acceptance radius to be to the projected point

Okay or maybe that's not the problem here... 🤔

the character pretty clearly walked up exaclty to the point and within the radius and it still thinks it hasn't reached the goal...

[oblique basin]

Yeah if it's cpp, return In Progress rather than completed then have your montage on completed delegate trigger a bool in your task memory that is being checked on tick. BP versions of this are quite a bit easier to use imo as the play montage node is async. But if your montage is being triggered outside of a task, cpp ftw.

[uneven cloud]

It is completely unnecessary to check a bool on tick. Just end the task when the delegate is called.

[flint trail]

@potent iris can you please pin this ?

[wispy cobalt]

Henlo

I make ai models

[dense owl]

Btw that’s already fixed in 5.4 🙂

If we’re talking about Cooldown decorator aborting on first pass

[pseudo solstice]

Yes.

[pseudo solstice]

That's correct.

Not everybody's projects are on 5.4 yet, however.

[rigid tulip]

does anyone know how can I check if a location is inside a limited navigation area like on this rock? Is there a way to get nav area size by location?

[azure ferry]

Is anyone available to help me with a tower defense issue? I'm trying to set it so you can't build a wall which would completely block the enemy path, but I can't get the ghost to affect the pathfinding of the path tester, and not the enemies already there.
If the ghost effects the navmesh then it works on both, if it blocks but doesn't affect the navmesh then the path is always clear apparently.

In AI, as its the AI move to pathing which is the issue

[misty wharf]

I would try using a specific nav area on the ghost. You can have the nav area update the navmesh, and set it up so that your path tester code uses a nav query filter which does not allow pathing through the ghost nav area. This way everything else should be able to still path

[azure ferry]

Amazing! Thank you!

[brisk relic]

Hey guys i am getting the decorator error when packaging project to windows64x

Here is behavior tree

and thats how i get those values

So error is caused by only "Decorator_HaveGunN" and "Decorator_HaveMeleeN"
cuz after deleting them, project package successful
plz help

[dense owl]

Granted, more of a PSA than anything 😅

[lucid plover]

Hi folks ! I'm trying UE 5.4 and the new State tree and Smart Objects features (linked assets, new possibility of parameters binding in Gameplay Interaction and so on). I'm a big fan of the philosophy of both and was tinkering with custom made systems before, largely less complex than what unreal proposes though. But it's seems to become very powerful and I would love a fully data driven workflow with simple generic behaviors that can execute whatever an object needs to do.

However, I'm having a hard time to understand how to execute properly a linked StateTree asset and run out of idea, maybe someone here has a solution.
I have an actor that look for an event and react to it by entering a new state that would run a linked asset (I'm trying to have generic state tree with parameters that can be reused).

But, the execution stop at the state that would run the linked asset, and the debugger log is "Could not trigger completion transition, jump back to root state".
The state running the linked asset has a transition on state completed, and my linked asset has its root state with a transition to Tree Succeeded on state completed and a child state with a simple Delay with no transition, (I believe that would fallback to its parent on completion, given the arrow icon "Parent").

Anyone has tried this and got it to works ? Do you have an idea where I'm wrong ?
(I can screenshot my setup if it's help).

Edit : this setup works if it's a linked subtree (inside the same asset).

[stoic pier]

How would you do this with the task memory? Are you passing the pointer to it somehow then reinterpret_cast in the character's montage callback? Can't seem to get a delegate to callback to the task.

[uneven cloud]

Why are you creating new decorators to check a blackboard key?

[uneven cloud]

Binding to delegates with non instanced BT tasks should be done by using AI tasks. The BT task triggers an AI task and waits for the AI task to end. The AI task is what binds to the montage delegate.

GDC is the best resource for technical information.

[keen crow]

Is it ok to call WaitForMessage in UBTTaskNode::AbortTask override? It seems that prior to ::AbortTask, the task gets unsubscribed from all message observers, but I have a task that relies on some logic to be finalized (GAS ability for melee attack to be specific). Judging by the code, both FinishLatentAbort and FinishLatentTask do call UnregisterNodeFromObservers eventually, but maybe there are some pitfalls I'm unaware of?

[cyan karma]

Got an enemy design and Curious about the best way to implement it with navigation

The has a behavior that calls for it to run at the player in a straight line
and if it doesn't have sufficient room to stop it should collide into objects and die

what is the best way to have an agent "move to a point off the nav mesh"

like into a wall

i think i have a good outline for calculating all the needed positions etc, but
unsure of that last part of getting the agent to force itself into the wall

[misty wharf]

If it runs in a straight line then maybe don't need to use navigation for it?

[cyan karma]

what would you suggest?
i want it to still handle height variations

i just did the early stub prototype by just hard interpolating the actor lol
and trying to find a more consistent / robust method if needed

or am i under the incorect impression that agent move tos need to go through navigation at all

[misty wharf]

If it's a character you could just feed it movement input forwards and it should move into that direction

[cyan karma]

*head slap
that'd do it
glad i asked!

thanks!!

[misty wharf]

👍

[uneven cloud]

I would not recommend that direction. How I do that is the GAS ability is triggered via an AI task. When abort is called, the AI task is cancelled, but doesn't finish until the ability has ended.

[brisk relic]

i want to check if "enemy ai" variable "have gun and have melee" is true or false. so i tried to directly get variables from enemy ai in decorator but it didn't worked at gave error of BT Decorator AI so i made services to set variables in BB key, and tried to check BB key. but this also didn't worked

[uneven cloud]

You don't need to make a new decorator to check every BB key. There's a built-in one that can check any key. Also services happen at a different time than decorators, so your functionality won't actually work. I recommend doing the AI with Blueprints course that is linked in the pinned messages to learn how the systems work.

[limber maple]

How do I make my ai have a longer time until it ignores me and runs away?

[limber maple]

I have patrol and chase code just wondering because once i break sight it loses interest pretty fast

[misty wharf]

You could try adjusting the settings in the sight sense for when it loses sight, or if that doesn't get the results you want, then you need to set up some custom logic for it in your code that deals with sight loss

F.ex. you could set a timer which sets a value in the BB to indicate sight was lost instead of immediately setting it

[brisk relic]

thanks for reminding me. i used build-in decorator for BBkey but it still showing error.
so let me clarify some thing maybe you can tell whats wrong.

1. i am checking value for "havegun" var through service

2. and here is how i get it

3. and then i use build-in decorator for BBkey as you mentioned
   and thats it

[brisk relic]

its default value is false

[drowsy steppe]

Hey all 🙂
What is the best approach for flying Ai navigation in your opinion (for something like drones)? Since DoN hasn't been updated for UE5, for now, I just use forward line trace to change direction but I think it will be problematic in more complex situations.

One thing that came to my mind was to create grid cell system around flying object that check collisions for every cell and make decision based on shortest path but I feel it could get taxing on CPU really fast in scale

[zinc juniper]

Would this be the right channel to ask for advice considering AI on the client?

[dense owl]

If it’s UE’s AI, generally yes

Also I just noticed this channel’s description is a bit short

[misty wharf]

5.4 lets you finally query for smart objects that are in use

Meaning I can hopefully delete my hack on top of their implementation that I needed for supporting queuing on objects since previously you couldn't query for things that had all their slots in use

[harsh storm]

@uneven cloud Maybe 5.4 improved some perf with invokers? 🙏

[dense owl]

alright, I hope someone can help me figure this navmesh height issue out cause I've been troubleshooting it on and off for a while now. Here's a video of what's happening, hopefully one of the legends/AI architects here knows how to fix this because I've tried almost every setting in Navigation and Navigation System in Project Settings, with no success.

when this tower was pre-built before runtime and navmesh was static, it didn't have any issues. Now, it seems like it doesn't want to generate properly past a certain height, one way or another

[uneven cloud]

Are you running the BT in On Possess or Begin Play? It should be done in On Possess.

[uneven cloud]

You're still regenerating the nav mesh a lot.

[harsh storm]

Sure. But it looks like they may have used them for the Lego game.

[uneven cloud]

The "best" would probably be looking up Sparse Voxel Octree navigation, but that's a lot of work and really should only be done with C++. Another option is to look up BOIDS.

[uneven cloud]

What looks like is going on is not necessarily a height restriction, but it's only generating X amount of tiles. I really can't help much without actually debugging it. Do you have engine source?

[celest nebula]

Does it sound reasonable to create a custom EQS test for the purpose of scoring based on something such as damage taken from an actor (while considering default provided tests like visiblity, pathfinding, and gameplay tags)?

[dense owl]

I’ll have to check if I installed it again now that I upgraded. Weird tho, the tile limit in settings is set to the default which is quite high

Yeah I have the source. What can I show

[uneven cloud]

Creating custom EQS tests is pretty common.

[uneven cloud]

You'll want to put a breakpoint in the recast navigation generator in the function that starts the generation and step through it.

[dense owl]

output is showing this again, idk why it doesn't always do it consistently though LogNavigation: Error: RecastNavMesh-Default> Failed to add tile (-1,0:4), 16 tile limit reached! (from FRecastNavMeshGenerator::AddGeneratedTileLayer). If using FixedTilePoolSize, try increasing the TilePoolSize or using bigger tiles.

where is this 16 tile limit though, the hard limit in settings is like 1M+

[dense owl]

k I'll try to find it when I have a chance

[celest nebula]

Alright thanks

[uneven cloud]

Can you show your navigation settings?

[dense owl]

In project settings? Sure sec

[uneven cloud]

You can look at the function in the warning to see where that variable is coming from.

[dense owl]

this should cover it

[dense owl]

k, thank you, I'll look through it when I get a chance, I gotta get ready for work

[abstract yarrow]

Does anyone think they can help me figure out why my Enemy AI stops chasing me a few seconds after he sees me? Im using a behavior tree and navigation invokers and it works for a second but then the enemy just stands there

Here's my code

sound warning

[uneven cloud]

Your first image is completely unreadable. What have you used to debug this? I recommend using the gameplay debugger to verify that it's still seeing you. Then to use the visual logger to walk through what is happening.

[abstract yarrow]

It’s readable if you zoom in. I confirmed that it’s high enough quality through discord to allow that so I don’t blow up the chat with too many images

But I’ll try out the gameplay debugger. I didn’t know that was a thing

[brisk relic]

it is how this is

[uneven cloud]

Running the BT is a function. On Possess is a function that you can override.

[brisk relic]

can you tell me where can i find "On Possess" ?

[uneven cloud]

It's an event that you can implement in the AI controller's event graph.

[brisk relic]

oh ok

should i tick this which is on top right ?

i am soo sorry if i am being dumb

i know it is kind of irritating

[brisk relic]

.

[uneven cloud]

No. Do you not know what an event is?

[harsh storm]

You should probably go through the AI course that is pinned honestly

As well as a BP basic course

[uneven cloud]

Honestly, the AI course is probably too advanced.

You need to understand at least the basics of blueprints.

[brisk relic]

i know basics and mid BP but i think Luthage is refering to custom event or there is on possess event already there

[dense owl]

OnPossess is built-in

[brisk relic]

oh ok

so like this right

i made everything by myself in this project https://alexjr.itch.io/advance-superhot-template-unreal-engine
but it just don't package due to BT AI Decorator error line 67 and that is what i am doing here

well same error again

[uneven cloud]

Why are you calling Use Blackboard?

[brisk relic]

idk i think i did it when i first started creating this project from some YT video on AI

i will change that

thank you soo much for help

[brisk relic]

still failed to package

[brisk relic]

can i share project with u ?

if u dont share with anyone

[uneven cloud]

No. I don't debug projects for people.

[brisk relic]

oh ok. i meant if you could fix this error. you can keep and use project for yourself

[uneven cloud]

https://forums.unrealengine.com/t/cant-cook-content-for-windows-or-package-game/380762/2

[brisk relic]

i saw it but will take a look again

[harsh storm]

That isn't as good of an offer as you might think it is. Especially towards Luthage 😅

[brisk relic]

looks like it, he is very skilled and dont need my petty bp

[harsh storm]

She*

[brisk relic]

oh

sorry

ye

she

[uneven cloud]

I also don't work on solo projects. I don't think my job would be happy if I took BPs from others.

[brisk relic]

ye i understand

[fathom sun]

Hello, how can I check whether an actor is inside a piece of a navmesh or whether it's on that path?

[stoic pier]

if you have a BTTask that returns InProgress shouldn't the tree stay on that task (branch) until FinishLatentTask is fired? My BT just flashes the task then attempts to do something else (with no observer aborts) before the finished task signal is fired.

At least that is the way I would want /expect a latent task to work

[misty wharf]

afaik yes

you should probably pause it and see if when it flashes it actually goes red, which could indicate that it actually failed for some reason. I think the visual logger may also have that kind of information in it

[stoic pier]

Ok cool, I'll debug it further. Just needed a sanity check. After all that time getting the montage callbacks to work and now the tree just triggers it and doesn't wait 😅

but I do have the logger printing a message when the when the callback happens so I know that's working

[signal island]

How do you guys deal with AI going to the same spot or near other AI spot with EQS? do i only need one eqs and give the FVector manually?

[misty wharf]

You mean you have an EQS generating points for the AI to go to, and they mostly go to the same spot instead of any of the others?

[wise sluice]

I would run the EQS once and distribute the points to all AI that rely on it

[misty wharf]

You can also use the options on it that allow it to choose with randomness from top 25% or such. This would avoid them all going to the same one

[dense owl]

@uneven cloud found the piece of code throwing the tile limit reached error, it's getting its max from getMaxTiles() which returns m_maxTiles

trying to track down how that's being set exactly

[dense owl]

so this points to int maxTiles in struct dtNavMeshResParams, inside dtNavMeshParams I guess, just having a hard time tracking down how it's taking params in to set that, or more specifically, which param and from where

so dumb

if I just turn Fixed Tile Pool Size on with the default value, it magically fixes it.

ig there's some bug in there making it auto-allocate a tiny amount of tiles.

[hexed kelp]

Are there any good, complete examples out there of state trees or behavior trees of production NPCs out there? I understand how to use all the basic features of both, but I'm trying to find resources on how to structure fairly complex behaviors and I'm not finding much. It could be old games, pdfs, whatever. Doesn't have to be Unreal, but more about the architectural best practices.

[misty wharf]

Good question, been wondering the same on occasion. The Game AI Pro books have some stuff but I don't really think it's quite on that level

[distant citrus]

I'm using some grid-based path finding and the character's AI MoveTo function sort've has the character skating around the destination points loosey-goosey - where should I start on tightening this up? If in the CharacterMovementComponent, which variables should I pay particular attention to (increase, decrease, etc)?

I also want the AI agent to arrive exactly at the destination vector, and not leave any room for variance... what's the best way to achieve that?

[uneven cloud]

The nav mesh is a 2d flat plane. What do you mean if something is "inside?" You can check if a location is on the nav mesh by using the function project to navigation.

[fathom sun]

What function are you referring to?

[uneven cloud]

I find that using a context to get other AI's move to location and doing a distance check with a filter works really well.

[hexed kelp]

Yeah, the intermediate learning content is always tough to find... People have made intro tutorials for everything, but "how do I do it in a scalable way?" is tough to find.

[uneven cloud]

It's in the navigation system. Project Point To Navigation.

[uneven cloud]

GDC AI Talks are a great resource. That's really the only place professionals can show that kind of thing.

[uneven cloud]

You would need to implement your own movement solution. How path following works is they are pushed in the direction of the path point and use velocity to get there. You can't get exact movement using that method.

[distant citrus]

Understood, that makes perfect sense, I appreciate it. Thank you!

[misty gale]

Lerping would get you there exactly ^

[distant citrus]

Thanks @misty gale appreciate that, that makes sense.

[lyric flint]

out of interest anyone know what I need to do to have my cpp AI controller be the one from the crowd AI controller one rather then be derived from the normal AI controller ?

[misty wharf]

Look at the builtin ADetourCrowdAIController or whatever it was called. Basically you need to use the FObjectInitializer constructor to replace the path following comp with the crowd following comp

[lyric flint]

I believe I did it

My Ai Controller has that and it's derived from my c++ so I must have done it right

[misty wharf]

Yep :)

[uneven cloud]

While changing the path following component will work, to change the base class of a C++ class you change it in the header where the class is declared.

[lyric flint]

.h ```// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "AIController.h"
#include "Navigation/CrowdFollowingComponent.h"
#include "Prototype_Hickorys/GenericEnums.h"
#include "BaseAIController.generated.h"

/**
*
*/
UCLASS()
class PROTOTYPE_HICKORYS_API ABaseAIController : public AAIController
{
GENERATED_BODY()

public:
ABaseAIController(const FObjectInitializer& ObjectInitializer);

.cpp ```// Fill out your copyright notice in the Description page of Project Settings.

#include "AI/Controllers/BaseAIController.h"

ABaseAIController::ABaseAIController(const FObjectInitializer& ObjectInitializer)
: Super(ObjectInitializer.SetDefaultSubobjectClass<UCrowdFollowingComponent>(TEXT("PathFollowingComponent")))
{

}```

Thats what I've done in my c++ side of things

never done it before so I'm taking it I've done it right

[uneven cloud]

See where it says : public AAIController? That's the class it's deriving from. You change that class to the new one. Then you need to include the header for the new class.

[lyric flint]

i'm confused sorry

what would I derive from instead ?

[uneven cloud]

What are you confused by? This is basic C++.

[lyric flint]

what I mean is the detourcrowd one isn't something you can derive your AIController from

[uneven cloud]

Why not? That's literally how it works.

[lyric flint]

or at least in c++ when you try to derive it you only have AIController as an option to derive your c++ class from

so what would the detour one be called then

and I'll change the public thing

found it

[uneven cloud]

ADetourCrowdAIController

[lyric flint]

I got failed build

it's not happy that I changed the class the c++ is being derived from at all

[uneven cloud]

Did you include the file?

[lyric flint]

#pragma once

#include "CoreMinimal.h"
#include "AIController.h"
#include "DetourCrowdAIController.h"
#include "Navigation/CrowdFollowingComponent.h"
#include "Prototype_Hickorys/GenericEnums.h"
#include "BaseAIController.generated.h"

/**
 * 
 */
UCLASS()
class PROTOTYPE_HICKORYS_API ABaseAIController : public ADetourCrowdAIController
{
    GENERATED_BODY()

public:
    ABaseAIController(const FObjectInitializer& ObjectInitializer);

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Default)
    EGuestJourney CurrentJourneyStep = EGuestJourney::Idle;
    
};

I did

@uneven cloud you got idea why it's not happy ?

[uneven cloud]

Typically unresolved external symbols means that you didn't include it correctly.

[lyric flint]

well you can see the includes there

[uneven cloud]

You can just use the changing the path following component method. Something might be weird with the crowd controller

[harsh storm]

It's not exported

So you actually can't inherit from it in C++

[uneven cloud]

I figured that might be the case. So many AI classes are missing that

[harsh storm]

But all it literally is, is a normal AI controller with the FObjectInitializer thingy

[lyric flint]

so what I've done above will work

obvs I change to derive from AAIController

[uneven cloud]

That's what I get for trying to teach someone basic C++

[harsh storm]

This is all the class is

So it's very easy to just do what they did instead

[lyric flint]

So what I've done above minus the change to what the cpp is derived from will that work for me

[harsh storm]

I wasn't paying attention to what you've actually done

[lyric flint]

I can see the comp in my BP derived but sometimes seeing something don't mean it'll work haha

[harsh storm]

Just copy how they do it and you should be fine

[lyric flint]

This is what I done

[lyric flint]

And this

[zinc juniper]

I'm currently working on an Order System for my RTS and stumbled upon the question if it is better to do requirement checking in the behavior tree or in the AiController?

Scenario: Player issues the AiController to let the selected unit attack another unit. Should the BT check if all conditions are met and start movement if necessary or should the AiController figure things out and start a move task and a following attack task if conditions are met?

[misty wharf]

It depends

Having the AI controller do the checks can offer more flexibility in terms of sharing behavior trees, as the logic can be in the controller and the BT doesn't need to know how a specific unit type does the check

But whether that's useful in your case or not depends on if you even want to share BT's like that or if you have BTs per type anyway

[glacial harbor]

The latent BP Move To task seems broken in 5.4. If the target actor is blocking the nav mesh, the AI won't move towards it. Even if the "Require Navigable End Location" and "Project Goal" are set to Yes. The BTTask version of MoveTo seems fine though.

[misty wharf]

Glad I decided to wait for 5.4.1 with how many random things seem broken in it again :P

[halcyon briar]

Hello.
Where do I find Lyra's AI code ?

I can't seem to find any BTrees ? Do the bots simply shoot the player on sight ?

[misty gale]

Same, atleast 4 things now 😅

• string tabels
  • fix: #engine-source message
• moveTo?
• shader compilation
• pasting to name / string? arrays
• spline doesnt trigger construction scrupt of owning actor

[misty wharf]

Unfamiliar with Lyra but have you checked they aren't using state trees instead?

[stoic pier]

I can't seem to find any examples of this kind of usage. My custom Melee Attack task is bound to a Montage end delegate like so which fires fine. The issue I'm having is the leaf the task is on doesn't pause execution of the tree. It tries to continually start it if on the left side or just triggers it and tries to do something else if on the right side of a selector. It's most likely operator error but there seems to be very little information on this.

Also not using task memory for this since I'm really not sure how to access it outside of tick or execute..

[sullen escarp]

The BTs are in the plugin folder inside ShooterCore game feature. Should also be able to press Ctrl + P for the Open Asset hotkey and type in "Behavior Tree" they'll come up too.

[misty wharf]

TIL you can search by asset type name in that dialog, good tip :D

[cyan sigil]

Behavior tree question: I am making Leash behaviors for my AI and I need them to be able to recognize when they exceed their leashing range while moving but not while attacking. Is there a common pattern for this?

If I put it on a decorator it might interrupt attacks.

I could try the inverse: Prevent the leashing branch from firing while the character is attacking.

[uncut rune]

Hello guys. I'm just brainstorming how to implement ''combat'' system in my RTS game (commanding units to attack, they attack on ''cooldown/attackspeed"), attacking when in range, if not in range come closer etc. etc. Is the AI Behavioral Tree way to go? I had previously worked in Unity where I just coded whole system that was checking if clicked on enemy > engage in combat > if not close enough to attack > move to target > if in range, deal dmg every 3s (start animation, bla bla bla). Can I also program it with blueprints and just attach that component to the units that I want to use it? I will have Player Units, Enemy Units and Monsters. I'm not looking for ready thing, just brainstorming which way should I choose to make it easiest and the most effective?

[fleet coral]

Any reason why Agent Radius and Agent Height keep resetting when I reload the engine?

I changed the values in both RecastNavMesh and project settings. The one in project settings saves fine, but the recastnavmesh resets to the engine default values anyway.

[small moat]

I'm having weird behavior where the first time a AISense (Sight in this case) is used the behavior is different from subsequent times. Here, the units on the left lag for a sec and attack the further units, which is different from the expected behavior I see in the second round

Is there something I need to do to "prime" or prepare the AISense so that the results are consistent?

[dense owl]

Try deleting and remaking your navmesh

For the first part of that question, regarding settings not saving

[uneven cloud]

The move to task is an example of how that works. BT tasks in C++ are not instanced per actor by default. Your code is going to be incredibly buggy.

You are also missing the entire point of delegates by sending a pointer to the BT task to the character. The character shouldn't know anything about the BT task.

[uneven cloud]

You use the prioritization of tasks that is built in to the structure of the BT. Tasks on the right can't interrupt ones on the left.

[uneven cloud]

The entire point of using an AI architecture (BTs, FSM, ect) is to organize the logic in a way that makes sense for your game, is easier to implement, is less prone to bugs and saves perf. Sure you can script it in any way that you want, but there are downsides to doing so.

[uneven cloud]

If you are making the values smaller than the default, then you need to create a supported agent setting in the project settings instead of manually setting it like you are.

[uncut rune]

I started stuyding about BTs. It starts to make sense. Any other thing I should be aware of ?

[uneven cloud]

I recommend doing the AI with Blueprints course in the pinned messages to learn about the AI systems.

[uncut rune]

On my way, thanks! ❤️

[remote willow]

Hey there, I was hoping I could get some advice on this issue I have. ( well one of many lol) I am working on game that is a jrpg. I'm using 2d sprites that will move in 3d space. My plan is to have up to 3 party members playable at a time ( will be 8 total ) where the 2 characters will follow the active leader with a character switch feature. Anyways as you can see in the video I am having an issue having the follower Characters mimic what the Party leader ( the plyear) moment and animations and continue to face the camera instead of looking flat.

I hope this is the write location for this?

[uneven cloud]

There's something flawed in your logic. I recommend using the visual logger to debug.

[uneven cloud]

By default, AI characters rotate towards the direction of movement. You'll need to turn that off. Use control rotation yaw is the variable.

[zinc sky]

Hi I am trying to make my enemy abort after a certain period of time, this task makes the enemy attack only if he's in a certain radius of the player. I am trying to make this so that if he does not land the attack after a certain amount of time it will move to the next task in the tree but I cannot figure it out

I tried adding a timer decorator and that didn't work. I think I am overcomplicating it

[remote willow]

How do I update the followers Animation though? I've been trying to figure this out and it's been making cry lol.

[uneven cloud]

What do you mean by update the animation?

[remote willow]

so The character that is following the player controlled character doesn't mimic what the controlled character is doing. Like running , idle ect.

I am using Paper ZD BTW

[uneven cloud]

You really shouldn't use delays in BT tasks. Delays are just timers that you can't cancel, and BT tasks should always be cancelable.

When you say you tried a timer decorator and it didn't work, what do you mean by it didn't work?

[zinc sky]

the task did not abort after the set time

[uneven cloud]

Did you set it up to actually mimic the player?

[remote willow]

I thought I did

I am using a parent class and the characters you see are child of

[uneven cloud]

How is it being mimicked?

[fleet coral]

Solved! Thanks!

[uneven cloud]

Did it not actually abort or did it not look like it aborted, because you don't have any functionality for the abort?

[zinc sky]

I have a dodge after this task and it did not trigger after the 2 second timer

could you show me an example of an abort with functionality if it's not too much trouble?

[uneven cloud]

Is the next task a part of a sequence? If so, it didn't trigger because the timer decorator fails the task which ends the sequence. I recommend using the visual logger to walk through the functionality the BT does.

[uneven cloud]

No I can't. It's just a matter of using the abort event and canceling the attack.

[zinc sky]

So I have to attach one of these inside the task?

[small moat]

I've never used this visual debugger, this is super cool, thank you. It'll take some time to figure it out, but it seems to point even more to some difference between the AISense Sight is working in particular. The two on the left remain in the "idle" state with Perception enabled while the two on the right immediately switch from "idle" to "combat"

The logic isn't even complex enough to possibly be flawed lmao but I wouldn't be surprised somehow. I'm basically GetAllActorsOfClass to grab the 4 units and calling SetStateAsIdle on each to set the AISight to enabled . The BT is responding to the state change as expected

[uneven cloud]

Any logic can be flawed. Such as you aren't doing any target selection, they just attack the first one they see.

[uneven cloud]

You have to use the receive abort event.

[small moat]

Sure, but, ceteris paribus, why would the first one they see be consistently different between the first and second run?

[zinc sky]

so id have to put it at the start or somewhere else?

cause I tried at start but got an error

[uneven cloud]

Because it's not deterministic.

[uneven cloud]

Do you know what it means to implement an event?

[zinc sky]

not in this case

[uneven cloud]

You aren't calling the event. You need to define what happens when the event is called.

[zinc sky]

so then I have to make the event fail then for this to work? how can I force it to fail?

[uneven cloud]

sigh

[uncut rune]

How did you make the nodes to look so nice?

[zinc sky]

sorry, I don't get it

[small moat]

Search for Flat Nodes on the Marketplace

[dense owl]

Implement the Receive Abort event

And insert whatever logic you want to happen in it

[zinc sky]

How will my enemy know when to abort?

im trying to set up a timer to abort after a certain amount of time

[dense owl]

The abort event executes when that specific node in the BT gets aborted, usually by a decorator observer

Iirc you need to use Finish Abort not Finish Execute for that one

[zinc sky]

ok I kinda get it now

thanks

so then something like this? I see it printing to the log once failed but the next task is not happening

[final loom]

Anyone here worked with car pathfinding in Unreal Engine?

[dense owl]

In a sequence, if one fails all subsequent tasks fail. In a selector, if left branch fails, it moves to right branch and so on

Which Luthage mentioned to you earlier

[zinc sky]

I must have missed it, thanks

[harsh storm]

So I was actually looking at the OnDestroy aspect for tasks and uhhhh

[harsh storm]

@uneven cloud For a play montage task that also needs to work across the network, which sounds better (I'm not using GAS!)

1. AI task that plays the montage and also calls a multicast RPC so clients play the animation as well

2. AI task that just hooks into a delegate from the base AI class of the project that gets executed after the AI class executes the montage (so the AI class will bind to the montage delegates and then broadcast its own, which in turn the AI task will actually be listen to)

[uneven cloud]

You really should use GAS. It handles montage replication really well. It also keeps them in sync so the notifies trigger correctly.

1. Is a bad idea. RPC functions should really be avoided. If a client connects after the call, that client won't know the montage has started. Always prefer rep notify variables over RPCs. It's also a lot less network traffic. If you really hate GAS that much, just use a replicated variable for the current montage on the character.

2. Is overly complicated and unnecessary. You only need to bind to the normal montage delegate on the server.

[harsh storm]

Oh, my game doesn't have a join-in-progress support, so that part of RPC doesn't bother me.

[uneven cloud]

I would still avoid RPCs. They aren't reliable.

Even if you mark them as reliable, they can still get dropped if there's too much network traffic.

[misty gale]

seem to be quite high limit on the rpc queue tho

but yeah we went for RepNotify, in our current iteration

[uneven cloud]

Why are you so against GAS?

[harsh storm]

Because I'm like 2 years into this project and don't have the time to rework my systems to be GAS friendly 😅

It is on my Todo list though

Just some other things take priority to prep for the Steam Next Fest

[uneven cloud]

Client prediction and montage replication make it worth it, but that makes sense.

[harsh storm]

Once my build is ready for the Steam Next Fest, I was going to re-evaluate it.

I'm far more comfy with the engine these days

And for the 2nd point - I wholly agree 😅, but it's late and it came up as a choice. But I was like, "this just seems silly. Let me double check" 🤣

And it is in fact - silly

[uneven cloud]

Our design team loves it, because they can check in as much tech debt as they want 🤣

But that's an overall blueprint problem and not specific to GAS.

[harsh storm]

It's probably one of the few popular systems of UE that I'm not fairly familiar with to be completely honest.

[heady coral]

Could anyone tell me why is this happening when using the Overlap box in the EQS query

it is also ovelaping with the pawn character

[winged zinc]

Open Source Local LLM Chat App : https://github.com/nerve-sparks/iris_android

[misty wharf]

Are you here just to advertise your library that has nothing to do with UE?

[rustic pond]

hello, I am using AIController->MoveToLocation for pawns movement but they seem to always stop when their collision touches the destination, which creates problems if collision is big enough or if i need more precision in movement
so the FVector3d::Dist between actor location and GetPathFollowingComponent()->GetCurrentTargetLocation() returns a number around 100 for me, and is lower when i make collision smaller
is there way to make them to get closer to the destination specified in MoveToLocation?

[lyric flint]

I have a custom EQS test to filter and score cover locations that (preferably) have their cover normals facing the player. I calculate this score is follows:

const float DotProduct = FVector::DotProduct(CoverSlotNormal, CoverToPlayer);
It.SetScore(TestPurpose, FilterType, DotProduct, MinThresholdValue, MaxThresholdValue);

and I set up the test in the constructor to work on floats:

ValidItemType = UEnvQueryItemType_VectorBase::StaticClass();
SetWorkOnFloatValues(true);

I think I misunderstand or am missing something, though. When I run the EQS test and ask for a Score, it works fine. But if I set it to Filter, it doesn't filter out any points. Here is my filter test (image) which I expect to filter out any points < 0.0 (and I calculate the dot product so I am assuming the range falls between -1 and 1).

[uneven cloud]

Using the AI task instead, you can set the stop on overlap settings. It also gives you a delegate to bind to for when it ends.

Be aware that navigation doesn't give you precise movement.

[uneven cloud]

The filter you have set will filter out any points that are > 0, not < 0. Is CoverToPlayer normalized? You can also use the visual logger to see what the score is.

[lyric flint]

1. I want to keep only the negative scores, so that's okay.
2. CoverToPlayer is normalized (right before the calculation). And if I break on const float DotProduct = ..., DotProduct has a value (0.89, -0.14, etc.) in Visual Studio's debugger.
3. My visual debugger just reads 0.00 for all items (image 1) and shows all are valid. It reads All Items: 59, ValidItems: 59.

If I change it to Filter and Score (image 2), I see scores under Test 0. And filter starts to work (it reads All Items: 59, ValidItems: 33).

[uneven cloud]

Are you setting it to filter only? If so, that's why. It only tests them until one passes.

[lyric flint]

I was and that's definitely my misunderstanding then! So, if I have 100 Items for an EQS test on FilterOnly and 1 of them passes the test, the rest do as well?

[uneven cloud]

They don't pass. It's returning the first one that passes.

If you change the mode to anything other than single result, it will test them all. It's just an optimization.

[lyric flint]

Damnit, that's exactly it and I've definitely made this mistake before. Thank you!

[olive prism]

Hello, a question, I am managing the states of my AI with an Enum and I am changing values in the enum from the AI Controller, is that okay? Is it a good practice?

[dense owl]

I think you’re not supposed to use a BT as a State Tree

[olive prism]

And how should I do it? I saw several AI videos on YouTube and they handled it like this

[dense owl]

You could maybe use a State Tree?

[olive prism]

I'll read more of that, thanks.

[harsh storm]

And they are making the same mistakes that you are. BT's are not state machine's. They are priority pickers pretty much.

Rely on the priority nature of how BT's work

Use conditions to gate things

Not something like "CurrentState == EState::Walk" either

[uneven cloud]

They are just repeating bad behavior that they saw other YouTubers make. You should really do the AI with Blueprints course that's pinned here to learn the systems instead of relying on bad tutorials.

The primary difference between a FSM and a BT is that it separates the actions from the transition logic. Why that is important is that when you add new behavior, you only need to add it to the tree based on it's priority or how important that behavior is vs the other. For example combat is typically a higher priority than wandering. In a BT, you don't touch the wandering behavior when you add combat behavior. Things can also be removed without touching any other subtree.

Using a "state selector" means that you have to add the enum and then the logic in the AI controller. That logic usually follows the functionality of "if in state x and y is true, change to state z." The more states that you add, the gnarlier that function gets. Which just makes it harder to debug and reason about.

You are also losing out on the optimization of early outs - if combat is the highest priority and it's a valid path in the tree, it doesn't need to evaluate anything else.

BTs that do this also lose out on having reasonable fallback behavior for when something fails. What ends up happening is their trees explode in complexity trying to add fallback behavior for each "state".

[harsh storm]

@potent iris Can you pin this 👆? People use BT's as state machine's often enough and this goes into enough reasoning on why that isn't ideal. Justifies pinning it imo.

Given enough time, Luthage will have all of the pins

[misty gale]

Empress of pins

[dense owl]

And then we can just say see pins instead of repeating the same things over and over 😀

[misty gale]

I still gotta delve deeper into it😅

Some things put me in more doubt than others lol

Like would the BT simply decide "Attack" while the pawn decides what that means ? What if there's multiple attacks with different criteria? Controller picks which. And BT just decide when?

I should just continue the tut instead of ask here 😂

[dense owl]

Is there a resource of similar quality that goes over all the different AI options within the context of UE? I really would like to familiarize myself more with State Trees, FSMs etc

[harsh storm]

Nope. Just Luthage.

And she'll tell you to read through GameAIPro and watch GDC talks. Then go off and do it.

[dense owl]

Idk that there are GDCs talking specifically about UE’s state trees for example, but I’ll keep looking

[harsh storm]

Read the docs, read the source, experiment

That's the route

[dense owl]

Aye, I’m familiar with the usual route, was just curious about the options/ resources out there that are vetted by the Architect

[misty gale]

Tuts are ment to be condensed results if experience 😅

Often they are just starting points for those making them