gameplay-ai

[gray olive]

Got it.

I was right XD
Always fun to try debugging

[midnight light]

AI Tip #20230809 - Use Acceleration For Paths ✅

[harsh storm]

Somewhere, poor Luthage has shed a tear 🤣

[uneven cloud]

Yes. You should store weak pointers and not raw pointers.

[uneven cloud]

I think it should be a sticky. Use Acceleration For Paths in the movement component to smooth out movement.

[harsh storm]

If it is the more frequent of desired behavior, it should be on by default

[uneven cloud]

It should be. I turn it on by default in the NPC.

[flint plover]

I'm just debating on things like if AI Hearing is a bit like MutiSphere Sphere Trace, I used a MutiSphere Sphere Trace for a basic sound detection, but thinking on using it during foot steps. Just always checking on the idea of performance and such. If I should just use the AI Hearing Sense.

[harsh storm]

Use AI Hearing Sense until you run into problems. Don't assume. Measure.

[flint plover]

just wonder if there is much difference if a player emits a MutiSphere Sphere Trace, compared to a Report Noise Event

[still kettle]

It seems State Tree tasks no longer provide the owner actor in the EnterState function. What is the proper way to get at our owner now?
(in blueprint, I see some native functions to get there)

[flint thunder]

has anyone encountered a problem with the pawn dying after calling eqs query?
i believe thats the reason why i experience this problem, but not sure, might be something else

[still kettle]

Oh wow, it's a secret handshake involving setting a variable's category. WTF

[harsh storm]

Yeah, it's one of the weird decisions imo

[still kettle]

Anywhere else in the engine that's just a cosmetic field.
I guess they don't want people to use the feature if Usability is no concern.

[ocean wren]

Yeah, I've used it..

It might help to look at the recast/detour original code if you're interested in how its meant to work

[uneven cloud]

No. Hearing sense is considerably cheaper.

[uneven cloud]

Are you turning off the AI when the pawn dies?

[uncut slate]

why my ai doesn't work in "standalone" but it works fine in "selected viewport" ?

i first used blueprints and had the problem, so i switched to behavior tree and still the same problem

[uncut slate]

[flint plover]

Ah thanks

[uncut slate]

i tried it in a fresh project and it works, so something is wrong with my project

[lyric flint]

I have a behaviour tree calling Move To which has the AI move to a random location stored in its Blackboard. This works great. However, if I add a Play Animation node to it afterwards (in a Sequence), after some time the AI starts to slide or walk in place. It's not instantaneous, but it does happen if I ever have the Play Animation node connected and it never happens as soon as I remove it. (The animation asset doesn't matter.)

This is tough since I can't share the ABP, but if anyone has any thoughts on what may be causing it and why it would be related to the Play Animation node, it would be much appreciated!

[elder perch]

For some bizarre reason, when the game is playing the navigation for my units is above the ground and not allowing for unit movement, but when looking at the navigation when not playing the navigation is on the ground. Any idea what this could be?

[elder perch]

For anyone who gets this issue, delete your nav volumes and put them back in. Sorts it

[flint thunder]

Bit more complex situation, because its the combat controller that does eqs for pawns as queriers
may have overcomplicated this a bit, but i ended up exposing RemoveAllQueriesByQuerier in blueprint function library

[obsidian star]

Hi guys, i'm quite new with AI i wanted to know how can i debug a spawned ai pawn, i have the perception comp on it and want to see how it works , any tips

[flint thunder]

press ' and use numpad to enable disable things you want

[obsidian star]

i did that and it showed debug object none

[flint thunder]

[obsidian star]

i'm spawning a pawn with the ai perception on it , is there a reason why it doesnt work

[flint thunder]

did you try to select the pawn in the outliner?

[obsidian star]

hmmmm 1s

[obsidian star]

nothing

[flint thunder]

does it have a controller/blackboard working?

[obsidian star]

it has an ai controller but nothing is in it

i'm testing it as a client not a standalone , and i need the logic to work on the local client side , so i didnt implement the controller since i don't have a local instance on the controller

so i put everything on the pawn and spawn him in the map

the spawning works but the perception doesnt

[flint thunder]

maybe you found a bug
works fine on my side, made a pawn with no autoposses and it shows me the sight range

[obsidian star]

it works fine when placed in the scene , do you play with client mode

?

i think i know where i messed up

this one doesnt log anything so i guess the perception needs to be on the controller

[flint thunder]

ah, yes that might be it, let me know if it does not work

no i did not use client, you were correct

[obsidian star]

hmmmmm ill test this further thank you for the help 😄

[flint thunder]

https://tenor.com/view/my-job-here-is-done-bye-done-gif-14879937

[slender wing]

Any knowledge on why state tree conditions are being disregarded for garbage cleanup and crashing in a packaged build?

[flint trail]

ugh, so finally ported my UE 4.27.2 project to UE 5.2 where everything that needed cleaning (at firts glance and BP errors) has been cleaned. Now Editor crashes on my AI when trying to PIE https://pastebin.com/fCFbAiq7

any ideas ?

[lyric flint]

Anyone have any tips on following a spline based on character velocity or acceleration? Currently, I'm using Move To with a specific location calculated using Get Location at Distance Along Spline where I pass in a float variable Current Distance that begins at 0 and increments by 1.0 after each Move To finishes. This has a few problems:

1. Stuttering because it waits for the Move To to finish before moving to a new location along the spline.
2. Changing the character velocity throws it out of whack (i.e., the 1.0 increment is hardcoded)

[spring jetty]

Hey folks, is there any way to notice when a sense is forgotten ? I mean like sight sense being forgotten after MaxAge seconds which We can set under each sense's config

I thought OnTargetPerceptionForgotten does that

but that event never fires actually... I dunno.

[opaque coyote]

yo forks I came across this plugin, so just wanted to know how much time will it take for me make such a thing
(https://maksmaisak.github.io/htn/front.html#features)

[ocean wren]

You're asking other people how long it will take YOU to make it? eh? that doesn't make sense

[ocean wren]

If I recall, you can loop over the currently sensed senses.. so you can do that and simply remove any that aren't current? There's definitely a way because I had mine doing some "was recently sensed" calculations too

[strange tusk]

I am working on a simulation game where I will have more than 100 ai characters in the world at the same time. I can't do performance tests as I haven't built my AI's yet, but is there anyone out there who can make an educated guess? AI's often walk around and perform specific behaviors assigned to them (in fact, you can imagine them as sims characters)

[celest python]

i think its just to use different overload for GetNavDataForProps();

[spring jetty]

isn't OnTargetPerceptionForgotten for that ? I dunno what's use of this event at all. dunno when it gets called. I have tried printing string on the screen to see when this event fires off. but no luck it never gets called

it's weird

[celest python]

I dont think there is any difference, im on mobile rn but those funcs are just for data prep and dispatch to recastnavmesh where actual path find exist

And there is only a single find path method afaik

Is that so? there must be 3 actually sorry.. Others must be overloads. Hierarchical path finding, regular one and raycast based one. No idea what other 2 does. That weird overload might be related with this too

[uneven cloud]

No one can make an educated quess on what your performance will be. Far too many variables.

[tardy drift]

https://forums.unrealengine.com/t/ais-sharing-the-same-behaviour-tree-influences-each-other/456133

I'm having a problem similar to this one. I have two AIs in my map and the only thing they share in common is the visual Service is triggered in one of them and the other is triggered, what should I do to have them triggered separately.

Sorry for my bad English, I'm getting support from Translation.

[dense owl]

I mean you prly need some form of level streaming and culling, otherwise you’re prly looking at using line traces that run the behavior tree on hit, which is pretty hacky

[thin zodiac]

ive some issue with a bttask, it never seems to end no matter how i set up my conditions to trigger finish execute

ive picked it apart a lot so rn now this is all the code thats running, on tick, and its not aborting but if i run just the 'finish execute' then it seems to finish the task when intended sort of

[thin zodiac]

may have solved my issue by using a BT service instead and moving the logic from my custom move to there

while using the basic 'MoveTo'

[dense owl]

Why are you using event receive tick

It’s supposed to be receive execute

[karmic pelican]

AI

[thin zodiac]

the tick was checking for a condition that didnt fit into the screenshot but moving it to a service seems to have yielded better results

so the npc would interrupt running towards player basically, idk the 'Move To' options all seem a litle hard to deal with sometimes

[dense owl]

Yeah that’s what I meant mb forgot about deprecated ones

[dense owl]

Doesn’t matter, your task’s initial node was incorrect, hence why it was prly getting stuck

But yes if you want to check things on tick or on an interval you use a service

[thin zodiac]

yeah, only took a day to figure that out it seems 😄 what would you use the tick inside a task for then though

[thorn girder]

Perception always has to be on the AI controller

[dense owl]

Maybe that’s a node you use inside a service, not a task?

Not entirely sure, haven’t used it myself but I’d wager that’s what was causing your issue

[gray olive]

episode 4 million of "why isn't this working, what checkbox have I missed?

can anyone point me in the right direction here

Why isn't the dropdown of "ideal range" popping up for me in the decorator?

here's the BTD

another hour of checking dropdowns, remaking BPs and stuff and I give up, I can't find what Im doing wrong

[uneven cloud]

BTs aren't shared like that. If you are using the blackboard, you need to make sure they aren't shared. It's a check box on the blackboard key.

[uneven cloud]

The variable needs to be set to public

[gray olive]

thanks XD

I just noticed it myself, but I appreciate it

I was adding more to see how it would change the other keys

and noticed they werent set to public

[brittle lynx]

Hi, I made that. It took me six months of 40h/week work to make version 1.0 of this, and then around 50 updates over the last 3 years.

[uncut slate]

any way to stop this guy following me from glitching ?

https://streamable.com/f6xqe5

[leaden frigate]

I won't be able to help since I'm headed to work, but there's a couple other pieces of info to provide. How is anim playing? What is the acceptable distance set to on the Move To node? Things like that; the more info you provide the quicker someone might answer

[dense owl]

You have no fallback/cooldown behavior, try adding a wait node for like 1s to the right of the MoveTo

And maybe a selector above the sequence with a wait node as fail safe

[uncut slate]

so i made him wait, but he still sort of glitches out when he gets to where he's going

it's like it doesn't smoothly go back, it jumps back

[dense owl]

Open your tree and watch it during play, see if it’s acting all crazy

[uncut slate]

looks legit

[dense owl]

Show the new tree

[uncut slate]

i put the blendspace walking part right in front of the idle, seems to help a bit

[dense owl]

Add a selector above the sequence, put another 1s wait node on its right branch

[gray olive]

Another one of my "random things I get stuck on." Been at this for 2 hours now, and wondering if I could get any pointers.

Issue: Setting up basic AI for taking cover behind walls from player.
Problem: My AI executes the sword equip but then gets "stuck" on the cover sequence and does not move at all. I have my EQS set to "single best." However, when I change it to "best 5%" he starts moving DIRECTLY away from me by 1 square at a time.

If I set the EQS and switch the grid generate from Quierier to Attack target, and leave the distance on "Query." It works for a while, maybe 30 seconds, but if I wait around too long on one side of the wall, or try to get a weird angle, it breaks and runs directly away from me.

I can also swap the distance check to "attack target" and it somehow seems to work well, deposite making zero sense in the context of the calculate best distance, which is set to inverse.

I am trying to get the AI to hide from the player's line of sight, to the closest point that achieves that goal.

this simply doesn't work for me and the AI remains stationary despite this supposedly being the correct way to do it

any pointers would be appreciated

[uncut slate]

?

[dense owl]

Yeah. Still broken ?

[uncut slate]

it looks pretty good, he just abruptly stops a little more than i would like ig

definately better so you don't see it as much atleast and i'll most likely have more stuff in there eventually

[dense owl]

Use acceleration for paths and braking distance on the cmc

[gray olive]

after a bit of testing I realized the enemy AI is blocking my LOS

how do I go about fixing this without breaking my other systems such as targeting/damage collision?

is there a setting for this contained in the AI tree?

how do I add a minimum range from query for grid? I can do it on circle, but I don't see the option here

yeah I think I need a solution where my collision setting on my enemy don't interact with Trace from the EQS

[dense owl]

Just add a test on your query to filter him out

[gray olive]

add what test and how to filter?

Dont see any filters

[dense owl]

That is, change your trace channel

Make a custom one if needed

Tho tbh I’m not rly sure what you’re trying to achieve anymore

[gray olive]

im trying to maintain my sanity with my prejectile system and seemingly line tracing on queries conflicting

[muted fossil]

Hi guys,
is it possible to have nav areas that use the shape of my dynamic mesh?

[gray olive]

anyone know why melee is red and the others blue?

does it have anything to do with this? Though all 3 say blackboard not compatible, and Ranged is the only one that has issues

[celest python]

PathFollowingComponent's enum

i forgot its name

check its tick, it has two separate branches

to continue path following

check if its set to "following path"

you can also check current path ptr from pathfollowing

(i dont have rider open )

cleanest and best would be not using simplemoveto btw

its another Epic™️ antipattern to provide simplicity

[celest python]

First example comes to my mind is comparing the FNavPath ptr from path following or using the delegates that trigger when pathfollowing started

iirc there should be a multicast delegate fired when path started, otherwise compare FNavPath shared ptrs

[uneven cloud]

1. Turn on use acceleration for paths in the movement component and adjust acceleration and deceleration.

2. If it's still not looking OK, your animation is the problem.

To use the one with a delegate instead of simple move to.

[uncut slate]

i tunred on that acceleration for paths, and set the deceleration a little higher, it may have worked

it's looking a little better

[uneven cloud]

You want the deceleration a little lower. The default is set really high.

[uncut slate]

ok

i'll try it lower

wow, big difference

[uncut slate]

thanks

[uneven cloud]

You can't use a different blackboard for a subtree.

[gray olive]

can anyone figure out what might be causing this? it keeps getting stuck in a loop of move to LOS and will never re-enter strafe and attack. Any pointers where this logic could be breaking?

the EQS is the exact same, drawing a line trace to check for character LOS and going to the best place to attack. The second is if the LOS is broken, to make it cancel the first tree and immediately go to "the best" result to LOS the player

decorator here from the first rree

[dense owl]

put a wait node on your Combat State selector right branch and get in the habit of setting fallback behaviours

[gray olive]

Enemy won't stop running to areas on the grid, but WILL go to a location in sight if player breaks LOS

just will never go into the "strafe and attack" tree

[dense owl]

I don't see this Strafe and Attack, did you mean Evade and Attack?

[gray olive]

yeah sorry

you mean put a wait here?

[dense owl]

no, down and left

have a wait node right of Move To LOS

[gray olive]

doesn't seem to do anything

[dense owl]

I meant that in general, for easier debugging, not the actual fix for your problem. Does the gameplay debugger show Attack Target Key being set at runtime?

[gray olive]

not super used to using it

Im guessing u mean this interface?

[dense owl]

yes, that's the first go-to for AI debugging 🙂

you see how your AttackTarget Key is None?

Your BTD_CanSeeTarget will always fail

[gray olive]

attack target key is none?

it shouldnt be

[dense owl]

how are you setting it?

is it that BTT_FocusTarget task?

[gray olive]

its so long ago now i set this up im trying to remember

[dense owl]

k well idk what you're doing there but the point is you're never putting anything inside the Attack Target Key prior to checking if the Attack Target Key is set, so it will always FAIL.

[gray olive]

ah got it

i think

[gray olive]

but it works fine with any of my other trees

so attack target key must be working

[dense owl]

the question is WHEN/WHERE

is it being set

find out

don't just guess

[uneven cloud]

Move to location if in BP. The move to AI task if in C++.

Then you can make your own in the same way that the move to AI task works. By binding to the path following component's delegates.

[dense owl]

watching 2 legends working together, it's like the Avengers in here 🍿 🙂

[obsidian igloo]

are there any good ways to optimize character movement in ue5? I can barely run 20 AI with very simple move to logic without dropping about 30 frames

[celest python]

Tick batching, calling findfloor separately in order, using navmesh walking

first two require solid C++ knowledge

[dense owl]

Prly start with the 3rd one and go from there

[celest python]

3 -> 1 -> anything else ->3

but umm..

i think 3 eliminates 2 anyway

findfloor is for non navmesh walking

[dense owl]

True

[keen crow]

Is it possible to parametrize EQS contexts in EQS query asset so that I could expose that parameter in EQS context class and then either set it manually or bind it in EQS asset itself?

[uncut slate]

why the variable isn't showing up in the behavior tree ? the other one works fine

[dense owl]

Expose it

And hit compile 😀

[uncut slate]

Why did i need to expose it one, but not the other ?

this one has the variable in behavior tree without expose on spawn

[granite robin]

My AI that I haven't touched in like a year seemed to have broken - they are supposed to wander but if they are about to walk into a crosswalk when it is not clear, they will stop and wait - then they are told they can move on (which is called Queuing) As you can see here it never finishes that behavior tree - and on the blueprint for the character you see I am updating the blackboard every frame - now I"m not sure why I would have done that if it is going to not let these BT finish but can someone give me a nudge - I swear this was working fine before.

[uneven cloud]

It needs to be public, not exposed on spawn

[uncut slate]

well it showed up with expose on spawn

but it isn't public by default ?

[uneven cloud]

Use the visual logger to debug. Your tree keeps resetting. Either from a task failure or you are using an observer abort

[uneven cloud]

It is not public by default

[uncut slate]

if i check instance editable should it be public ? i only see private

[dense owl]

Sry I meant public not expose mb 😅

Altho I thought it was both

[granite robin]

I'll check but I thought it was because I was resetting the blackboard key it seemed at least I'm ticking that on the characters AI blueprint

[delicate halo]

Hi, if i want to update a move target location with a statetree, where should i update it ? In the evaluator with a timer ?

[uncut slate]

what would stop the attack from running ? i put a print on event recieve execute ai and it doesn't say "running"

[dense owl]

Watch the tree at runtime and see if your sequence gets there

If one task fails all fail

[uncut slate]

https://streamable.com/r8c1ju

[uneven cloud]

Watching the tree at runtime is unreliable. Just debug using the visual logger.

[uncut slate]

well it's not running

[dense owl]

Fair, I meant to start with

[uncut slate]

i fixed it, i had success false didn't even notice that's default

[opaque coyote]

dude you do realise this your own plugin I am asking, please don't take offended here, why I am ask my question here because my boss was saying he can make this in one week where in I am pushing to purchase your plugin.

[opaque fractal]

Hello! I'm currently trying to make my characters use MoveTo (ai controller) but with root motion animation

I managed to get the path through UPathFollowingComponent, get the position of the points in the path with GetImmediateMoveDestination(), and with that, calculate the direction the character should face and rotation the character needs to offset by which will drive what type of animation to play (rotate by 90 degrees etc)

I've also enabled Allow Physics Rotation During Animation so it can correct the rotation when needed. Allow Physics Rotation During Animation is disabled when running the pivot animations, and enabled again at certain points of the animation with anim notify

However, I seem to have a problem with the path generation that is affecting my initial rotation. The path will always generate a point near the character at the start, and it will always have a small offset away from the character. For example, the point will be a little bit to the right of the character.

This causes issue with my animation since the initial rotation will let say go 90 degrees to the right, but the actual destination (next point) is 180 degrees to the right away from the character. So it will run the 90 degree instead of the 180 degree animation which makes the animation look weird

Any suggestions on how to improve this?

[brittle lynx]

No offence taken. It seems unlikely that your boss could make this in a week. Even if that was the case, it’s most likely that a week of your boss’ time costs more than 300USD, so it would be more cost-effective to just buy the plugin 🙂

[brittle lynx]

Good thing I’m not selling it per-seat 😅

[celest python]

Turns out EULA enforce per-seat though

[brittle lynx]

This bit? https://www.unrealengine.com/en-US/eula/content

Plugins may be offered to you on a per user basis. Such Plugins may only be used by the number of users that you have purchased licenses for.
The use of the bold may seems to mean that it's up to the publisher to sell their plugin on a per-seat or per-company basis.

[celest python]

Duroxxigar contacted marketplace support and they said its per-user

"may" is "should/must" there

[brittle lynx]

Uhhhh oh well, I'm not enforcing it.

[opaque coyote]

so true man

[harsh storm]

Yeah. I've been having one hell of a time getting them to properly define what they mean by that and what constitutes a "seat" in their eyes.

(I've also been eyeballing your plugin for years. Just haven't had a need for HTN yet 😅)

[brittle lynx]

Hey thanks ❤️

[uneven cloud]

You need a way to pick a target. I prefer to use the EQS for it.

[still kettle]

You would write a target scoring algorithm in general. That could be ChooseClosest (which is really robotic), or Closest with any kind of stickiness (less robotic), or a full Aggro accounting system (high complexity). Or anyything in between.

Or something that deliberately spreads out targeting evenly across all players is a reasonable starting point.

[granite robin]

I want my AI to wander around the map - I used to have a Queuing system but I guess it was more broken than I realized - I've constructed intersections with collision volumes and DOTs functions to determine if they are entering and leaving a street - these check if the "Walk Light" is green or not - and it updates a blackboard key on the AI controller it it has to wait - that logic is working but when I dug into it, the random locations it was picking was coming back null- you can see on the BT here - The only place I can see where that location variable is set is here - so is the problem then, I need to make sure that function fires? Or possibly modify the BT to check for a valid location first?

Because If I am interpreting the behavior tree correctly during the error, it is failing on that second task, so it repeats until the BT enum changes

[ocean wren]

Usually the moveto outputs stuff into the log on failure if I recall.. might be worth looking

[granite robin]

In this case I'm adding something to make sure the vector comes back valid - I'm running this event but it doesn't seem to go to the MoveTo section,

Was I not supposed to use Event TIck to call this BT task?

Okay I guess it's processing it correctly - my only question now is, should that be "event receive tick - shouldn't it be a one shot deal fo the BT task?

[still kettle]

You probably want Event Receive Execute

but since you called FinishExecute in the tick it will only happen that one time, rather than repeatedly.

[uneven cloud]

Why are you using event tick?

[granite robin]

That's why I asked - it should be a simple event call right? (I've not touched this thing in 18 months, so maybe I did it wrong when I was first learning about behavior tree tasks

[uneven cloud]

If it's a one time thing, then you use event receive execute. If you are checking something while a task is running, then you use tick.

[granite robin]

Thanks - I've read both these tool tips and I get what they mean, but could you give me a practical example of one being the "suitable one" called

[uneven cloud]

The AI one is the newer one. It just gives you the AI controller and controlled pawn without having to use getters. Best to always just use that

[harsh storm]

Should just remove the old ones at this point.

[granite robin]

Out of curiosity, and I know it's a LOADED question, but how would you have setup a system to control pedestrians so they would use the crosswalk when it was clear, but wait when it is not? Right now I'm using collision boxes, which you have to set for each intersection (though I default them to the mesh which helps) The boxes have collision events based on DOT products to determien whether the AI is leaving the street or trying to access it - but I feel like there should have been an easier way to do this

The problem was I had no way to cleanly communicate what path was open based on the light -

[uneven cloud]

I'd use nav areas. If you use C++, you can get the nav area in the path following component.

[granite robin]

Thought about that - the tricky part is how do I make the AI just stop when it is about to walk into the street, the light chances, which either turns off the nav area or switches the filter to some ridiculous cost - I could easily end up writing so many edge cases - when I want them to just WAIT ...

wait enough is easy enough on the BT, but how would you structure the behavior so that when the nav area changes, they know to wait - What is the call that happens when it is walking towards a green crosswalk that turns red? YOu see how that could get tricky?

[uneven cloud]

You don't do that as part of the BT. You do that as part of navigation.

[gray olive]

Any ideas how to fix this?
Each sequence works on its own. Evade and attack circles the player attacking, the Move to LOS (on its own) constantly runs to the furthest point in the range grid to the player, but within line of sight, so will move to get back LOS if the player breaks LOS.

I added a decorator "can see target" in order to interrupt each sequence, if the player breaks LOS during the evade and attack sequence, or if the player becomes visible during the move to LOS sequence.

I've set the abort to "both" so that each can be interrupted by the decorator since it has higher priority.

However, when I run it, the enemy just keeps looping in the Move to LOS query and move to tasks. It never proceeds to attack the player if the line of sight is valid.

Point of interest is set to the "best" value in the move to LOS EQS. And set to "best 25%" in evade and attack.

Any pointers would be helpful, I've remade this about 4 times and all have the exact same problem.

[midnight light]

AI Tip #20230814 - Use Controller Desired Rotation ✅

[dense owl]

Did you figure out where your Attack Target Key is being set, since that key was showing as None during Gameplay Debugging and the decorator condition always failed?

[untold whale]

Question, i'm working on a stealth game and so the AI is quite complex as in terms of behaviour, patrols and other tasks it needs to perform. Will performance be significantly hampered when these are walking around a level? Or should they be put to sleep and not perform their tasks when the player is not near?

[dense owl]

Depends on how many you have, how they’re set up, etc., but you should first set it up and then takes steps to optimize, if necessary

Premature optimization is its own issue

[gray olive]

Yeah, seems fine though

[uncut slate]

this event isn't firing, i'm trying to use aiperception for enemy to see player

i have ai perception stimuli on my character

[dense owl]

Can’t see where that function is called tho

And what feeds it its input

[gray olive]

function?
It's setting the blackboard key as object actor based on sight perception target

That's where the key is set

you want to see the perception?

[uncut slate]

it never gets to next sequence

[gray olive]

this sets the perceived attack target, which then goes on to set the blackboard key of attack target

and here's the perception

[dense owl]

That looks very convoluted.You try actively watching that perceived actor value see if it’s actually going through all of that into your function with a non-null value?

[dense owl]

Did you check if cast is failing?

[uncut slate]

well it's not even getting there

[dense owl]

Those events are finicky

I recommend using the perceived actor generator on the EQS composite node instead

[uncut slate]

that log that says works actually doesn't work, probably should have put "doesn't work" in there ig

[uncut slate]

no clue what that means, ig i'll look it up. I used blueprints first, now i tried aiperception, so now i need something else ?

[uncut slate]

so your saying that event sometimes just doesn't work ?

[dense owl]

It triggers in ways you don’t necessarily expect

[uncut slate]

i'm not following how i would i do this otherwise

it makes no sense it's "unreliable" that's kind of shitty

is it just a different event i can use ?

[dense owl]

I told you

[dense owl]

^

[uncut slate]

https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/ArtificialIntelligence/EQS/EQSNodeReference/EQSNodeReferenceGenerators/ this ?

[dense owl]

Yeah, make a composite node

And add the perceived actors generator on it

From there you can add tests to filter as needed and then you can either run it as a task or as a service

[uncut slate]

i'm not sure how to do that, any type of link you could share that shows that ?

[foggy moth]

probably asked 1k times before me.. sorry in advance - but i'm trying to find the right way to STOP the AI BehaviorTree/Blackboard....

Have read all up & down online on this and BrainComponent->StopLogic() doesnt work, nor does UnPossess().

Whats the right way to achieve this?

[dense owl]

Brain component stop logic is the way. Show code

[dense owl]

Make an EQS query

3rd pinned video EQS timestamp if you don’t know how

[foggy moth]

This happens on server when attributeset is HP <= 0.... I can sit and watch the BTree still stay in the same branch UNTIL the actor is killed.

this is obviously in AIController class

[dense owl]

If this is #multiplayer that might be the issue. Did you check if it fires?

[uncut slate]

i mean this event fires perfectly fine in the tutorial, am i missing something ? you just have aiperception set to sight, and a stimuli source set to sight and that event should fire ?

[foggy moth]

multiplayer sure - what issue do you foresee? Any AI should be handled on server anyways - correct? Or are you considering that I need to NetMulticast it?

[dense owl]

The problem is when the target perception updates fires. But you do you 😀

[dense owl]

Idk enough about that topic tbh, but #multiplayer changes the whole rule set 😀. Does your onDeathHandle fire at all?

[uncut slate]

right so why is it not firing ? i'm looking into the query stuff but i was hoping not to use an experimental plugin

not a big deal thats how i did the water

[foggy moth]

of course it does - as stated before.

[dense owl]

Sry missed that

Either way you might need to do run on server or multicast hence why I recommended #multiplayer

Your stop logic code looks ok from my end

Not sure about unpossses tho

I think that might need to be run on the pawn itself with controller as target

Pretty sure EQS’ been around since 4.27 or so, I think they forgot the experimental flag on.

[dense owl]

I’ve had trouble with it calling the update on actors that it’s already seen at reliable intervals

Or even worse, discerning targets

[elder perch]

I have som Ai, it is set to follow the player. It follows the player fine except for this weird point here where they just stop and do nothing. there is navigation here and the mesh they are on is completely flat with its collision. Any suggestions on what could be causing this?

[astral sinew]

Have you tried with moving more to the other side and seeing if they can come through that way? Might be a collision issue that something is blocking their path physically.

[gray olive]

Turns out the decorator was failing because the line trace was detecting the attack target. I misunderstood the purpose of the line trace to be checking if it hits any objects, but not if it's hitting the player.

I had to add the attack target to the ignore array.

[elder perch]

Thanks, it was, some sodding invisible mesh was blocking them but not showing up on navigation

[astral sinew]

Had something like that also happening when I was working with Custom Collision Channels and a big box. Took me an hour to realize back then that they can't move because they are colliding with the interior of the box.

[craggy ermine]

Hey, what's an easy way to set the patrol path of an enemy at runtime? (e.i when spawning the pawn and not setting the reference manually in the view port)

[weak wyvern]

Can someone help me figure out why the enemy drone isn't moving to my character location? It can focus on me but not move.

void ADroneAIController::Tick(float DeltaSeconds) 
{
    Super::Tick(DeltaSeconds);
    APawn* PlayerPawn = UGameplayStatics::GetPlayerPawn(GetWorld(), 0);

    if(LineOfSightTo(PlayerPawn))
    {
        // UE_LOG(LogTemp, Warning, TEXT("in sight"));
        SetFocus(PlayerPawn);
        UE_LOG(LogTemp, Warning, TEXT("Playerpawn %s"), *PlayerPawn->GetName());
        MoveToActor(PlayerPawn, AcceptanceRadius);
        UE_LOG(LogTemp, Warning, TEXT("going"));
    }
    else 
    {
        ClearFocus(EAIFocusPriority::Gameplay);
        StopMovement();
    }

}

I've also tried doing it with a behavior tree and it can get the playerlocation right as well, it just doesnt move towards the player. That MoveTo task is not ending at all.

[uncut slate]

why this guy always does the same thing, he moves a couple times then gets stuck on the edge of the nav mesh
https://streamable.com/gls6at

[uneven cloud]

EQS has been around since before 4.7.

[uncut slate]

it's enabled by default

but it's not working correctly, he keeps doing the same thing every time just going to edge and then it breaks

[uneven cloud]

Attach to component is a really bad idea. What it is that you are trying to do?

[uneven cloud]

Movement is a latent functionality. You should not be calling it on tick. Every time you call it, it will cancel the move. Since you are doing it on tick it never can actually move.

[uncut slate]

this doesn't pick a random point in the circle ? it seems to be repeating itself

[uneven cloud]

Don't assume everyone here are "lads".

Depends on how you are creating your behavior.

[uneven cloud]

You need to add tests. The visual logger will also show you how it's scoring and selecting points.

[uncut slate]

same thing

[uncut slate]

ya how do i get those points to show up ?

[uneven cloud]

The EQS is already being logged. You just need to record it

[uncut slate]

what this guy does he goes into gameplay debugger mode and press 3

i can't get that to popup

how do you do that ?

[dense owl]

Press ; first

And it’s numpad 3

[uncut slate]

i don't see anything when i press 3

so if 3 shows nothing, then it's not working ?

it doesn't seem to be working well at all

[uncut slate]

nothing

[uneven cloud]

Why are you trying to use the gameplay debugger for EQS? It's hot garbage for it. Use the visual logger.

[uncut slate]

where is that ?

i see a profiler

[uneven cloud]

Tools/debug

[harsh storm]

I believe there are docs on how to use the visual logger as well

https://docs.unrealengine.com/4.27/en-US/TestingAndOptimization/VisualLogger/
https://benui.ca/unreal/visual-logger/

[uncut slate]

i'm getting a lot of warnings but it looks like it's just out of bounds of the volume i figured that would not be a problem

a lot of failed path, end failed

[uneven cloud]

Why would you figure that wouldn't be a problem? They need to be able to navigate to the points

[uncut slate]

well for making it initally go to a point it's always the same one, and also i figured it might go out of bounds of the volume not sure why that would be a problem figured it would handle that

i mean it seems weird to just break if your at the edge of the nav mesh bounds

but it's not working on first selection, but if some are out of bounds thats an issue ?

[lyric flint]

Hello, is it possible to forget the perception of only a specific actor rather than to "forget all"?

[uncut slate]

even with a small radius he's just moving in the same direction every time i play

[uncut slate]

i was assuming this discard unreachable would not include the ones not in bounds

i been having a rough go with ai

[lethal island]

In a larger behaviour tree is there a way I can return to part way up the tree to a specific selector?

Been fumbling about with it this afternoon and feel as though I must be missing something obvious 🤦

[harsh storm]

Maybe - but that seems odd to me personally

[ocean wren]

You don't "return" to anything. Its just a matter of what the current priority is based on the blackboard and the tree. So the way to have a behaviour appear, is to make sure the conditions that cause it to happen are clear (or you gate other behaviour that might override it).

[uncut slate]

still doing the same thing

not getting much from that visual logger it looks like it's finding a place and moving to it

but i want it to be random, he's just moving in one direction

and he moves in that direction actually no matter which way he's rotated always the same

https://streamable.com/vc2rju

[uncut slate]

^

[uncut slate]

[dense owl]

Idk if you’ve already posted it but can we see code on how you’re updating the location?

[uncut slate]

i ran this

[uncut slate]

and you can see in this video its supposed to be the attached blackboard key as the result of the query ?

[dense owl]

Ran it how? Task or service ?

[dense owl]

Do you just need a random spot?

[uncut slate]

ya, then later add attack if hes close

[dense owl]

Ok did you watch how they do it in the 3rd pinned link?

[uncut slate]

ya with a cone

i just used the circle

i fixed the blackboard key its still not working

also i dont get those points when i hit 3

[dense owl]

I meant the random movement using EQS filtering and random loc node

[uncut slate]

i'll go through the whole thing ig but i already had a problem with ai perception

[dense owl]

Takes a sec to get it but once it clicks it’ll feel easy

[uneven cloud]

Your blackboard key is self actor and not target location. So you are never saving the EQS location.

[uncut slate]

i fixed that, still the same problem. although it's odd that it worked at all.

or weird that it still had the same behavior

FindPatrolPoint

[dense owl]

I don’t rly see why that would ever give you more than one random point

[uncut slate]

they are just moving in one direction

[uneven cloud]

What is the run mode?

[uncut slate]

single best item

[uncut slate]

so i'm doing something wrong then

or i'm missing something

[uncut slate]

he's moving in one direction, stopping then going that direction again over and over looks like random amounts

[dense owl]

Try using a get random location node in there, see if you get what you want

[uncut slate]

well i can create an event and make it work but i was trying to use eqs to see if it worked

this works fine

problem was when i tried to use aiperception the event was not triggering for sight

so i was trying this eqs thing out but its not working like i thought

[dense owl]

Not saying you shouldn’t use EQS , again I’d recommend following that video and do what they do

[rich veldt]

Hello, I'm trying to conceptualize a system for my NPCs/AI that "simulates" their location and behavior while unloaded. I'd like to unload or deactivate AI (behavior tree, animation, rendering, tick) when the player is not in a certain area, and load the AI back in for example (a bit more complex than that but for this question it's fine).

I have loading and saving implemented for the AI for when the player leaves the game and comes back, so I have a struct with all necessary AI info for saving and loading.

But I'm wondering about doing that during runtime, if just saving the AI's info like health etc to a TMap and then Destroying it and delegating its position updates to a periodic timer on the AI's route manager (maybe with a slightly randomized delay to the looping timer to make sure they're not all updating in sync), and then SpawnActor-ing the AI at its new current location with the info from the TMap when the player comes back, is a fine way to do it? Or is there another, better way, to deactivate or unload an AI character temporarily that doesn't involve DestroyActor and SpawnActor?

If destroying and spawning is the way to go, I may even use this runtime "saveout info, destroy, spawn" system to reset NPCs when the player rests (like in dark souls etc)...but save out the NPC's default/reset spawn data instead of its current data and using that to respawn..because trying to reset their info and teleport them to their default position was breaking their behavior somehow, just seemed messier than respawning a fresh actor.
Again, slightly async'd.

[crystal sequoia]

how would it be possible for an AI to be stuck in this node for dozens of seconds?

haha i am dumb, I had overridden the abort event without a call to the parent (edit. that doesn't seem to fix it, stills just stalls in that function, calling finish execute or finish abort in the event handler doesn't help, removing the event handler fixes it)

[uneven cloud]

That's why you keep getting the same result. You have no tests that actually score anything, so it's always picking the first generated item.

[uncut slate]

changing that mode definately made it work

single random item from best 5% seems to pick a random spot

i still can't see anything when i press 3

[uneven cloud]

You really need to think about how much the player will actually notice. Most of the time, they will not notice if a NPC has been simulated while not around. For the most part we can fake it using smoke and mirrors.

Spawning and destroying actors is actually rather expensive. I recommend looking into actor pooling. Saving and loading during runtime is normal.

[rich veldt]

is actor pooling the answer to "how do i not have all 250 AICharacters and their behavior trees and anim blueprints just running buck wild across the map when the player isn't nearby?"?

[rich veldt]

if so do you have a link i can start learning from? googling doesn't seem to be fruitful so far

my question had a lot of layers to it, of course one layer was whether or not it's smart or even useful to fake-simulate the location of NPCs as the player likely won't notice, and thanks for suggesting that.

the main thing i wanted to get into was how to "unload" an actor (AICharacter) without destroying/spawning, so im assuming this actor pooling thing is the key?

[uneven cloud]

There are lots of results if you Google UE actor pooling.

If you use C++, I recommend using the significance manager to determine if an actor should be pooled.

[rich veldt]

ah it's just like reusing the same already spawned actors and allocating currently not-necessary actors to the pool to be reused?

i do that with cover points in my cover system, albeit really basic. dunno why i didn't clue in on the concept at first just now lol

i'll look into building a pooling system for my AI and see how i can integrate significance manager, thanks for the tips.

[burnt iris]

At this point I beg for help. My Blueprint (Type:Character) refusing to Move anywhere with function AI_MoveTo.

NavMesh is showing "Greenspots" on my landscape. (I also tried deleting navmesh and inserting new one, and also "Build all Levels")
RecastNavMesh - isWorldPartitionedNavMesh - False
I've played with Blueprint capsule and mesh sizes
AI Controller class is set to one created by me (No changes with default one though)
Auto Posses AI - Placed in world or spawned

What else Could it be?
When I'm issuing AI_MoveTo command by using Mouse right click (setting destination by hand) they move.

Please help me. (Photo of Blueprint_task for my Enemy AI)

[celest python]

Open visual logger

start recording before running your task

watch logs

AI Move To will log in detail

then let us know about the logs by posting all vislog recorded

[dense owl]

Curious about these navmesh “spots”. Is it not just one green plane?

[rancid wing]

anyone know how to make an enemy dodge a ball?

can i use the ai perception for it?

like so

[uncut slate]

aiperception is just not working for me

i have the aiperception on the enemy

and a stimuli on the character

but in the behavior tree it's just not percieving the character

i followed a couple different tutorials and it just fails every time to percieve the player

[dense owl]

Just checking you made sure to bypass the friend or foe system like they do in the vid

[uncut slate]

i've tried a couple different videos it works fine in the videos, but the aiperception just isn't triggering

[dense owl]

When you use gameplay debugger does it show the keys as getting the targets ?

[uncut slate]

the visual logger i'm not really following it too well

not sure it doesn't seem to be working there is this one space the rest doesn't say much

aiperception on character

[obsidian igloo]

anyone happen to know why an AI controller wont tick? ive made sure the component starts with tick enabled, and it will properly run a behavior tree on begin play, but the component isnt ticking for some reason

im using UE5

ah restarting the editor fixes it, weird lol

[burnt iris]

Its just poor choice of words from me - its green flat area everything is fine in NavMesh.

[burnt iris]

Also added Debug Spheres for locations where AI should move.

I see that it says that my AI_Task_Blueprint is finished, but they havent moved an inch.

Maybe that's gonna add up to something, Characters are being spawned at Target Locations. Also here you can see that NavMesh looks good.

[celest python]

I just woke up, will read soon

[raven nacelle]

Hy. Quick question, how to disable the visibility of Smart Object objects?

[astral sinew]

Couldn't figure it out half a year ago, I think I even asked in this server back then. It is only displayed in Editor however, if you package it they should be gone.

[raven nacelle]

Thanks. In any version?

[celest python]

It logs as InProgress, finished there means "BT just called the Execute func of BTTask" rather then the actually finishing the task

So your MoveTo is active, error is somewhere else

Try printing velocity of your AI in tick

If you are on C++ also print EPathFollowingState of path following component

and lasly send a screenshot of your BT when MoveTo is active, lets see if debugger is showing if MoveTo is active or not

[astral sinew]

I tried it in 5.1 and 5.2 Preview back then I think.

[celest python]

your pawn is empty 😄

AI Move To is a static function, it requires to know which pawn to move

[burnt iris]

Jesus christ

welp, dumbest mistakes are hardest to find by yourself
Thank you its working

https://tenor.com/view/shame-go-t-game-of-thrones-walk-of-shame-shameful-gif-4949558

[flint trail]

I have a pillar (BP actor, movable, Can eve Affect Navigation is unchecked) sitting in the recession on the floor. When nav mesh is built, there is hole in the navmesh around that recession in the floor. The idea is that when BP pillar moves down at some point, it would bridge the recession and becomes flush with the rest of the floor.

The problem is that when it happens - navmesh still has a hole over it and the pillar-floor is not navigable in that area. I want it to become navigable.

How do I do that?

Adding navmesh modifier around the recession doesn't help :/

[astral sinew]

You could make your navmesh dynamic and the pillar a dynamic obstacle. If that's not an option you can either make navlinks and disable them while the pillar is up and then enabling them when the pillar is down, or a navmesh modifier which is by default NULL and then you change it to something else that would permit the Agents to move over it.

[flint trail]

I use nav invoker on the player, so nav mesh is dynamic. I tried making pillar dynamic obstacle, but it doesn't change anything 😦

maybe UE 5.2.0 is just broken? 😅

actually, pillar is too small (or the nav mesh cell size is too big) - maybe that's why nav mesh isn't covering the pillar after lowering pillar flush with the floor ?

[still crypt]

Anyone know how to access node memory of the inherited class when making child classes of BT nodes? Is it possible?

[astral sinew]

Could be a mesh sizing thing. You can try playing around with the values to see if it changes anything.

[uncut slate]

[rancid wing]

?

Can perception see smaller objects?

[uneven cloud]

Can ever affect navigation should not be unchecked on something you want to be considered for navigation.

[flint trail]

ah, makes sense 😅

[flint trail]

I doesn't "see" as eyes would. It just references actors inside the "cone".

so any size would be "seen"

[uneven cloud]

You need to calculate the predicted location before it hits, to see if it will hit, when and from what direction. There is a prediction sense you can use, if you want.

[uncut slate]

this is actually printing when the enemy sees or doesn't see the player it looks like

but this isn't working

[flint sphinx]

Hi, how can I add a NavMeshBoundsVolume inside an actor?

I didn't find any component for actors and using a child actor doesn't seem to work.

[uncut slate]

here it's failing to == the character bp, this first branch i logged just fine but this one doesn't log

i used cast instead and it seemed to work

[uneven cloud]

Why are you trying to do this?

[uncut slate]

using the events i got it to notice the player, but this still no worky

so the aiperception is working, the eqs isn't triggering like in the video i was watching

[flint sphinx]

Imagine my actor is a door, I have a trigger that forces the player camera to look at it and meanwhile I want to interpolate the player location to a certain location, to do that I use "simple move to location" which requires a NavMeshBoundsVolume.

I want to be able to place my "doors" everywhere without having to put a NavMesh for each one.

[uneven cloud]

You don't want the nav mesh bounds volume on the door. You want it around anywhere a character can navigate.

[flint sphinx]

If I need to it wouldn't be a big deal tho, just wanted to check if there is a better way to do it.

[flint sphinx]

I want to use SimpleMoveToLocation on the player character, I don't need to have a NavMesh around.

[uneven cloud]

If you don't think you need a nav mesh then you don't need a nav mesh bounds volume

[flint sphinx]

Well yes I need to if I want to use this node.

I basically want the player to move from point 1 to 2.

[uneven cloud]

Then why did you say that you don't need to have a nav mesh?

[flint sphinx]

I mean I don't need to have it "around" I just need a small NavMesh that covers my actor.

[flint sphinx]

Oh sorry I think I misunderstood that.

[uneven cloud]

Just put a bounds volume over the entire playable area.

[flint sphinx]

Yeah I could I just thought that it wouldn't be necessary to cover parts of the map that would never be used.

I guess I'll do it that way, thank you!

[uncut slate]

i got this working but it's not that good

[acoustic niche]

Could someone dm me and help me fix this super simple yet weird issue im having my one of my ai... Thank you!

[dense owl]

Not likely, just state the issue here and someone will help if they know how

[acoustic niche]

Alright

well i copied and pasted my ai_bp and changed over somethings to match my OTHER ai that i just added... Everything is working except for the fact that my new ai isnt attacking me... it will chase me but will not attack me, and im dumbfounded by it and have no idea how to fix it.

[dense owl]

Show code

And if you’re using BTs you can just break them into subtrees and use what you need rather than copy paste

[acoustic niche]

https://gyazo.com/a027b11e6c8eec5d178454e804930644

[acoustic niche]

i actually didnt know that

do i need a seperate BT for the new ai despite wanting it too do the same thing?

[dense owl]

Pawn sensing is deprecated, should be using ai perception instead

[dense owl]

Nope, you would just run the same BT or possess it with the same controller bp

[acoustic niche]

i mean its the same BP as my original ai. I dont see why it does everything except for attacking me.. it will roam, chase, but will not attack.

[dense owl]

Make sure your on see pawn actually fires

Debug using breakpoints, not sure if pawn sensing works with gameplay debugger

[acoustic niche]

See pawn is working

im so lost..

but attack player isnt

i just seen that

https://gyazo.com/1c3b5c82195773c7b82902c2584199af

i changed that

which was originally this

https://gyazo.com/2d1d98059b9519a5c0a6bcbc5a16dd47

@dense owl you think this would have something too do with it?

[neat hatch]

when working with level streaming, how do I make the ai to work again?

when summoned with a button, it can find the player character just fine

the behaviour tree runs fine

but it just cannot move

even tho I've made a level with the navmesh bounds volume

and set it to load up the navmesh level along with the main playable level

this is the setup

[acoustic niche]

show the bp for the ai

do you have the get world location, etc set up?

[neat hatch]

the event begin play blueprint is empty

why would I need to get the world location?

[acoustic niche]

nvm i read it wrong my bad

[neat hatch]

I have the runtime generation for the navmesh set to Dynamic

and have this also enabled

[acoustic niche]

I figured it out btw, thanks for the help.@dense owl

[dense owl]

What was the issue

[foggy moth]

Re-addressing this because I cant find a solution - anyoine know an answer?

[uncut slate]

^

[dense owl]

You said that’s on the AICon bp ?

[dense owl]

The purpose of that generator is to replace the on perception updated function not add to it

I'll show you sec

this is the one I used:

the tests are for my use case, you can add your own

left branch runs the attack once a target is set

[uncut slate]

right, but i was saying it doesn't work

[dense owl]

show your code where you run the EQS

I only saw the query and the old stuff

[uncut slate]

just as an example the query never runs down it's always on the right side

[dense owl]

Hit play use gameplay debugger and screenshot

[uncut slate]

gameplay debugger ?

[dense owl]

;

[dense owl]

Not that

[uncut slate]

i mean that's what i thought you said

[dense owl]

That’s ~ or something

[uncut slate]

no thats ;

~ gives me the console

[dense owl]

oh mb mb

'

not semi-colon

been a minute

apostrophe key

[uncut slate]

got it

that's nice i was looking for that stuff, now when i hit 3 it shows what i wanted

[dense owl]

I can’t read what it says for Player

But I’m guessing None

So yeah press 3 for EQS and check if it’s out of range or something

You should be able to see a green circle displaying the range

[uncut slate]

i think it says none and then i see it going to bp thirdperson then back to none

[dense owl]

What’s your char named, bp third?

Like your player

[uncut slate]

bp third person

from the template

i don't see a circle around him, but now that i can see this i need to fix the patrolling

[dense owl]

Press num4

[uncut slate]

looks like it is triggering something i get a green dot on me like he should be seeing me

the actual aiperception event seemed to work

but the eqs version is not

[dense owl]

Yep

What’s the range on your query

Just for sanity check

Oh I guess it’s set to perception range so that should be fine

Did you get rid of the perception updated functionality tho?

You don’t want to run both

[uncut slate]

ya i just removed it, same thing

[dense owl]

Your decorator, set it to abort lower

[uncut slate]

same

also how would i space these spots out so he picks a spot anwhere in the circle

[dense owl]

I haven’t played with contexts enough

[dense owl]

Actually try abort both

But that might not be the issue still

From what I can gather it’s spotting the char but then it’s losing it. I’d try running the game and pausing the tree, then use the arrows to see what happens step by step

[uncut slate]

atleast from what i can tell it's just running the right side the value player either isn't getting set or like you said it's losing it, ig i'll look at the tree and see how it acts

[foggy moth]

sorry for the late reply - was doing dinner & old manned it fell asleep lol.

Yes this is on teh AIController... we talked briefly about whats going on. GetBrain->StopLogic() does not work. This is coming in as Server authmode - lets agree to leave networking out of the picture because i'm confident that the networking isnt the issue.

[dense owl]

Fair enough. Are you certain that your pawn/char is being possessed by the correct AIController? Did you change its default?

Or that the stop logic is on the correct AICon bp?

[foggy moth]

i am 100% certain - its a child class of AIController (C++ base) prototyping in BP atm

am I expecting the BehaviorTree to stop when this function is invoked?

[dense owl]

Yes that’s the right command

Try moving all of these to the pawn itself

[foggy moth]

i can for sure try that

[dense owl]

You’ll prly need to use get controller and maybe cast into the right AICon given you’re dealing with multiplayer and getAIController wants an index

[neat hatch]

How do I fix it?

[neat hatch]

fixed it...

had to duplicate the navmesh and paste it into the Persistent Level

[pliant ginkgo]

Hey, my enemy can only move when using AIMoveTo with its capsule component's size is <3, as soon as the size is >=3, the enemy just cannot move. What can i do in order to allow this?

[neat hatch]

if the enemy is placed in the level, make sure you select the Capsule component and disable "Can Ever Affect Navigation" in the Collision Category

[pliant ginkgo]

it is

the scale is the issue

[neat hatch]

how do you set the scale?

[pliant ginkgo]

in the capsule component's transform

[neat hatch]

ah, so no blueprint

[lyric flint]

hello guys
how can i remove the nav area? inside static mesh..?

[lyric flint]

ohh i just found it https://forums.unrealengine.com/t/how-do-i-stop-a-navmesh-from-generating-inside-a-static-mesh/304755

[uncut slate]

how can i get a bunch of green spots the character can go to inside the circle, right now it's on the outskirts of the circle

it's not a circle because the navmesh blocks it but you can see the points are on the edge

[uneven cloud]

Your capsule size needs to be less than the agent settings for the nav mesh. Did you change those in the project settings?

[dense owl]

Make a smaller circle?

[uncut slate]

ok but i was hoping to get all points within the circle

[dense owl]

I’m confused about what you’re trying to do with this

[uncut slate]

not just around the edge

well that is a random point finder

for roaming

[uncut slate]

these are points the enemy can goto

i'm hoping to fill the circle with more points somehow

[dense owl]

K, did you watch that video in full?

Cause they pretty much do that and filter the points from there

[uncut slate]

ig i will go through it step by step

[dim river]

Has anyone had success in making custom StateTree C++ classes in 5.2? It works fine in 5.1 for me but 5.2 I cannot get it to work its giving me these errors. I have the StateTreeModule and GameplayStateTreeModule dependecnies declared in build.cs.

Upon building any custom class even if its empty that inherits from StateTree throws error like the following.

[1/7] Compile [x64] SI_StateTree_TaskBase.cpp
0>StateTree.h(80): Error C4430 : missing type specifier - int assumed. Note: C++ does not support default-int
[2/7] Compile [x64] SI_StateTree_EvaluatorBase.cpp
0>StateTree.h(80): Error C4430 : missing type specifier - int assumed. Note: C++ does not support default-int

[vestal gale]

My brother and I are looking to knuckle down and learn basic NPC systems from the ground up (Utility curves, GOAP, and basic smart objects + behaviour tree stuff) for a project.

We've worked in Unreal a decent bit over the last year or so, but stil lack a depth of knowledge in this area, so I'm curious if anyone has any pointers or resources they'd recommend?

[vivid fern]

Had to migrate to 5.3. this seems broken in 5.2

I had this problem with mass + state trees, so likely it is the same one in regular state trees anyway

my guess is the generated code has a bug in it

[dim river]

Thank you for confirming! I thought it was a bigger issue but wanted to make sure it wasn't just me!

[harsh horizon]

Sup everyone. Could do with some help on something. I'm working on my report for my project and I need to basically say how I could have done the AI for my enemy better. My current system is basic with just an AI move to node and whilst I'm not looking to upgrade it now I am looking for ways to improve it if I WAS to. My current system is basically this with the green being the path and red dots being points the enemy travels to.

I've mentioned that it would basically be awkward in the future if things like forked paths were introduced as it would likely require a second vector array for the second path. I've also mentioned the fact that it uses manually set waypoints which is pretty bad from my perspective as it requires an array with 12 points on it (in this case) but if the map was bigger it would require more array elements which would require more manual setting.

So with all that being said what methods could I use to improve this? My first thought would be behaviour trees but as I haven't used them for a while I'm not sure on their capabilties.

[foggy moth]

I'm trying to track down some delegates/functions when the AIPerception.MaxAge has elasped - and the targetactor is "forgotten" ... i would have thought that it was OnTargetPerceptionForgotten but that isnt firing ... looking in source and I dont see any delegates/functions? Anyone have any ideas on this?

[foggy moth]

Figured this out - it is a setting in the ProjectSettings:

which triggers

[halcyon dagger]

If I have a big open world level and NavMeshBoundsVolume on it wouldn't it be better in terms of performance to place NavMeshBoundsVolume on AIController of my enemy instead of putting NavMeshBoundsVolume on level? or it's bad idea? I'm asking because if level is big it will take some time to calculate path for enemy. and if I attach some small NavMeshBoundsVolume to enemy it will calculate path faster

[uneven cloud]

Why are you building several different AI systems? You really should start simple with a FSM or BT.

[foggy moth]

i'm interested in this topic - is NavMeshBoundsVolume dynamically calculated if it is moved?

[uneven cloud]

The nav mesh bounds volume defines the area that the nav mesh is built. What makes you think that attaching it to an actor would make calculating the path faster?

[foggy moth]

I was also thinking how much of a canundrum i can think of when you would have >1 AI on the scene - all calculating paths for their respective NavMeshVolumes for each AIController..... could really flop on its face if i think about this right :/

[halcyon dagger]

I think there should be some checkbox for that

[uneven cloud]

Dynamic nav mesh regen is expensive and causes invalidating paths, which triggers more path calculations.

[halcyon dagger]

so you would recommend just to add NavMeshBoundsVolume to level?

[uneven cloud]

Yes. It makes 0 sense to attach it to moving actors.

[halcyon dagger]

Navigation Invokers that is what I need 🙂

[uneven cloud]

Dynamic nav mesh regen is expensive and causes invalidating paths, which triggers more path calculations.

[halcyon dagger]

Ok, I need to test it and decide if I need Navigation Invokers or not. At list now I know about Navigation Invokers and how to add it to aicontroller

[uncut slate]

https://www.youtube.com/watch?v=iY1jnFvHgbE

13:33, wtf ?

[lilac pasture]

does not work navmesh in the assembled game,
I use level streaming.
what to do ?

[flint trail]

so, I had AI working fine in UE 4.27

finally tested it in 5.2.0 - NPCs ignore me :/

[foggy moth]

theres alot of information missing here man ....

What classifies "ignore me" ?

[flint trail]

like, I am in front of NPC as he patrols from point to point and there is zero reaction. In UE4 it would go into attack mode.

[dense owl]

You’re wondering where that event is or what

[uncut slate]

i don't have anything like that setup

[foggy moth]

so you're leaving out entire chapters of information... what would make it attack? @flint trail

[dense owl]

Well you can make it or copy what they did

[uncut slate]

it doesn't show what they did

i'll have to look into enum i have not used them yet

i was looking for a previous video or something would show it but nothing i can see

[dense owl]

Doesn’t rly matter how you make it, they just gave an example as that part was not integral to the vid

[foggy moth]

Hey team! I have some AI that spawns and theyre running GetGenericTeamId() before pawn is set....

I wanted to delay the activation on the PerceptionComponent - but i dont look to be able to do this ... it crashes editor when It ry to set PerceptionComponent->bAutoActivate = false;

Anyone have any experience with this - or can fabricate up an idea on how to delay this behavior?

[uncut slate]

seems like it is, it's one of the tasks uses that event

i'll have to look into what he's talking about, still new and learning

[flint trail]

this one never kicks in when player enters AI Perception's view

[uncut slate]

did you try a print string ?

see if it pops up

i also found these three should be checked

[flint trail]

nothing prints

sense is configured the same as on your screenie

[uncut slate]

you have the stimuli on something ?

for example i have it on the player

[flint trail]

yeah, on player pawn

bah, source for senses was different than what AI Perception had senses configured for 🤦‍♂️

no idea how that happened, but thanks a bunch!!!

works again now

https://tenor.com/view/jeff-goldblum-phew-relief-close-gif-22418964

[foggy moth]

why would you have all 3 checked? Learn to use DetectionByAffiliation: https://www.youtube.com/watch?v=HwBdnviT2vs

Then start debugging - https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/ArtificialIntelligence/AIDebugging/

[uncut slate]

@flint trail

[flint trail]

yeeh, no

I don't C++

[foggy moth]

if anything comes of C++ - this is probably the most easy solution you'll ever have.

[flint trail]

most likely.. But I have even less free time these days, so I'd rather do what I already can and improve in that spectrum, rather than dive into C++ 😅

[foggy moth]

Moving these functions to the pawn made no difference. Hands down - this functionality does not work.

Does anyone know how to StopLogic properly in the AIController? I need to halt all execution of BehaviorTree on demand.

[dense owl]

Yes it does I’ve used it myself lol

here, since you think it's not you it's the engine:

I call mine from the PC, but regardless

it works perfectly fine

[foggy moth]

then why does my behavior tree continue execution when this functionality is executed?

if(AVI_EnemyAIController* EAIC = Cast<AVI_EnemyAIController>(GetController()))
        {
            EAIC->GetBrainComponent()->StopLogic("Death");
        }```

[foggy moth]

there's no need to be snide....

[dense owl]

didn't mean to be, just letting you know the functionality *normally * works

[foggy moth]

am i expecting the executon of the entire behavior tree to stop?

because thast not hte case :/

[dense owl]

hang on, let me dig into it

mind you I'm doing mine all with bp

[foggy moth]

and by execution - i mean the yellow around this graph chain - is still executing/animated/yellow when i call this function.... to me that means its executing still?

[foggy moth]

all of my BTT's and BehaviroTree itself is all blueprint

[dense owl]

ahhh

I see what you mean now

I saw that when I was running mine but it's only a visual artefact. I asked MieszkoZ about it and he said it looks like a visual bug. but the execution does stop

it's just that the tree acts like it's stuck running

rather than just go fully inactive

[foggy moth]

i'll force a test middle of executiono - instead of when i kill off teh pawn... to see if this works. Thanks for hte clarification!

[uneven cloud]

You need to debug it. Put in breakpoints. This works out of the box, so there's something not right with your project.

[dense owl]

yeah, see mine still looks like it's running when you call stop logic but the Patrol behavior does stop, so it works, just doesn't show you what you'd expect per se:

I thought you were saying you put breakpoints on your StopLogic node and it never fired

[foggy moth]

you are 100% correct - visual bugs. I did indeed force stop it middle of it running somewhere and it still ran to the task location - but all execution thereafter was halted.

[dense owl]

oh, good, progress 😄

[foggy moth]

@uneven cloud

thanks for the eyes on the situation - it takes 2 heads sometimes to make the things go right

[dense owl]

Don't I know it 😄

[vestal gale]

Yeah planning to start with a basic BT setup and build out more complex systems project by project as I go.
I'm just planning on spending the next couple of months really building up my skills in the area for a project.

[foggy moth]

how can i escape/fail out of this right selector when the top Decorator is sufficed? I have tried the decorator set to OnValueChange as well OnResultChange (Aborts Self/Both) and KeyQuery = ISNOTSET but it doesnt exit out until the MoveTo finishes :/ ..... i want to fail the selector children on that decorator.....

https://puu.sh/JO7Gt/74f313c4a3.png

will nullptr set as the blackboard key trigger this decorator::IsNotSet() ?

[foggy moth]

this bottom node was the culprit - using the top node solved this.....

https://puu.sh/JO7Lo/c76e52e825.png

[pine wren]

Hello! I'm trying to build a very simple AI that can follow my player and attack it once seen. I'm using the PerceptionAI component. In the Chase task I used an AI MoveTo which it's constantly returning Aborted. The character I'm trying to move has been defined in C++ and I've tried to create a brand new character with the same logic in Blueprints and weirdly enough it works. But the logic is exactly the same. Once an actor is seen it's added to an AttackTarget variable that then is used as destination of the AI Move To. What could cause the Aborted code?

I think what's happening is that with the C++ version it senses the pawn leaving continuously, whilst with the Blueprint version it doesn't

so with the C++ pawn it keeps getting in sight and removed

[pine wren]

I might have found another difference, the character that isn't working has a sword equipped, I tried removing it and it seems to be working. Is it possible it's colliding with the perception mechanic and preventing the character from being seen?

[dense owl]

Yes, the key should read as None if you use the Gameplay Debugger

as it stands, whatever is below that decorator will fail when the target is SET,

[pine wren]

for posterity, it was a problem with the collisions set on the weapon. I had a collision volume set around the weapon to damage the player, but the collision settings were "hiding" the target briefly and causing the drop of the target in the logic I programmed.

[still sundial]

Not sure if this belongs here but how do I allow my AI go through a Open Door?

The Nav Mesh works every where else

[foggy moth]

is yoru door wide enough to allow nav mesh to calculate through it? do you have some collision mesh on it that block the nav mesh?

[vivid fern]

also id imagine you have to have your door cut/uncut the navmesh when its closed vs open

[uncut slate]

theres a move to in the behavior tree, and i run an event to attack. How can i turn the enemy toward the character in the event ?

you can see has move to and i just slide around him and hes attacking air

[foggy moth]

OnGoalReached() -> AI->SetRotation(GetLookAt(FeedItSomeVectors))

or - have it lookAt when it goes to attack

thats what i do

then if player moves around the pawn - the pawn will look at it always

[uncut slate]

i tried this but the rotation is off for some reason

he's moving when i move but he's about 90 degrees off

[rancid wing]

heya!

anyone know if the target of Set Value as object should be a bb component type?

[uncut slate]

seems legit

[rancid wing]

ty!!

hmm, but my problem still remains then lol

so what im trying to do is:

on target perception update, if the component is a projectile , set the projectile target bb if not, set the player target bb

so basically i want the ai to tell if there is a projectile approaching, and also know where the player is using perception

aaand i feel like my logic is lacking when i explain it

I just dont know what other thing i should do instead of setting value as object each time

[uncut slate]

maybe have one key for projectile and one for player

[still sundial]

I got it working where it can go through but if I close the door on it when its chasing me It stops and stays there until It sees me again

[rancid wing]

yeah i did a do once

aaand

LogScript: Warning: Accessed None trying to read property CallFunc_GetActorOfClass_ReturnValue PIE: Error: Blueprint Runtime Error: "Accessed None trying to read property CallFunc_GetActorOfClass_ReturnValue". Node: Set Actor Location Graph: EventGraph Function: Execute Ubergraph BTTask Locate Player Projectile Blueprint: BTTask_LocatePlayerProjectile

is the warning i get

so....yeah

[uncut slate]

https://streamable.com/3545u1

[rancid wing]

so how do you configur a stimuli source in c++ for an actor?

I configured one, but when i pause and view the projectiles properties, the stimuli source is none

`// MyProjectile.h
#include "Perception/AIPerceptionStimuliSourceComponent.h"

UCLASS()
class AMyProjectile : public AActor
{
GENERATED_BODY()

public:
AMyProjectile();

protected:
UAIPerceptionStimuliSourceComponent* PerceptionStimuliSourceComponent;
};

// MyProjectile.cpp
AMyProjectile::AMyProjectile()
{
PerceptionStimuliSourceComponent = CreateDefaultSubobject<UAIPerceptionStimuliSourceComponent>(TEXT("PerceptionStimuliSourceComponent"));
}`

this is basiclly the code i put in

[astral sinew]

You can cast the Controlled Pawn instantly to the enemy character, you don’t have to go through the controller. Other than that there is a BT node you can run easily before the attack task that rotates the AI Character towards a BBEntry

[charred lava]

What are the differences between Global Tasks and Evaluators? I don't got it.

[brazen nest]

Hey Im using ue4 and have added the CrowdFollowingComponent to my AIController, but it does not seem to be working. Is there anything I need to do in the blueprints or some setting that im missing that needs to be enabled for it to work?

[oak bridge]

Is this setup good? because when he sees me he just spams the checkdistance but even if in range to attack or not the sequence of the parallel doesnt work

[astral sinew]

Selector Nodes execute their children from left to right. They stop executing when one of their children succeeds. If a Selector's child succeeds, the Selector succeeds. If all the Selector's children fail, the Selector fails.
I assume the DistanceCheck is returned with a succeed? ^^

[oak bridge]

oh yeah, is it that?

now i set it to fail but still goes out

[astral sinew]

I would say yes. The children of that Selector is Simple Parallel, the behavior of which is: The Simple Parallel node allows a single main Task node to be executed alongside of a full tree. When the main Task finishes, the setting in Finish Mode dictates if the node should finish immediately, aborting the secondary tree, or if it should delay for the secondary tree to finish. Since the main task "CheckForDistanceFromPlayer" finishes the secondary tree gets cut off instantly.

[oak bridge]

but if i set it to succeed false why it still goes on

[astral sinew]

Because it is a Selector with one children.

The Selector only sees "Simple Parallel", it doesn't tell or wait the Parallel to do the side tree because the task failed.

I think I have a Parallel code somewhere. I'll search for it.

[oak bridge]

mmm so i remove selector and use a sequence or just connect the simple parallel?

ahhh wait i think i got what you mean, so i should just connect the simple parallel to the root?

but in that case it would run the check distance all times, i wanted each branch to be able to check what they needed

[astral sinew]

The question is rather why would you want a Parallel node there?

I don't really see the function of it being there.

[oak bridge]

i dont know, i need to check if the player is in range meanwhile he moves so that he stops to attack

[astral sinew]

Unless you have complex stuff in the tasks it should be fine to just use a Sequence and do it this way: CheckForDistance -> MoveToPlayer (IfNotInRange), Conditional Sequence (IfInRange) -> Attack -> Wait

These run pretty quickly when not using Wait nodes so at most after Attack it will pause for a few seconds which you can remove if you want to. I would use a Cooldown decorator on the Attack if you wanted to achieve that.

[oak bridge]

like this?

the thing is that i was scared that movetoplayer was getting called once and so it wont check for distance each time but when the move was ended

[astral sinew]

I mean, if you set the acceptance radiusto be the distance that the AI should attack then it shouldn't be a problem. It will call the Success when it's in that range and then it could transfer to the attack part of the tree.

[oak bridge]

now he's moving to me but when he reaches me it bugs out

[astral sinew]

I would raise the DistanceCheck up one part. So the same level as the two sequence nodes.

[oak bridge]

oh selector maybe instead of first sequence right?

[astral sinew]

I would keep it a Sequence since you are using a few decorators. :p

[oak bridge]

and why it doesnt go to the attack but runs only root?

[astral sinew]

So like this

And you can then remove the Check in the bottom right corner as this one will run first always.

[oak bridge]

i mean here it fails on the second condition so it starts from root again

oh its the abort

nvm

when the condition doesnt work it just stops it and restart

[astral sinew]

It is the Sequence failing. I'm thinking on how to solve it. >_>

[oak bridge]

because when i was doing like in the image and switching to selector it was working

but i had to put 2 check

as in the image

[oak bridge]

like this exactly but first sequence was selector

[oak bridge]

that's why i was thinking about a simple parallel because it was like this somehow

but not working

[astral sinew]

You could try switching the Sequence to a Selector that checks for the PlayerRef

It should work.

[oak bridge]

i did like this

works

[uncut slate]

thanks i found it in the behavior tree

[uncut slate]

How can i cancel the wait all the way to the right if the enemy sees me

[still crypt]

You can use the same decorator you use on the left most branch, (simple blackboard decorator) and just use 'is not set' instead of 'is set'

[uncut slate]

is doesn't seem to work, i tried it on the sequence and the wait @still crypt

i also added to set the value as object to nothing when he goes out of site which seems to be working

i want to cancel the wait if it happens

so if during that time he sees the character he attacks instead of waiting untill after

[still crypt]

Mm, did you set it to abort self?

[leaden frigate]

I honestly sorta hate behavior trees for exactly this sort of confusion (I've done my current AI logic in BPs just using a switch node to control a FSM), but looking at what you have there, you'll want your leftmost Sequence node ABORT property set to Lower Priority; behavior trees run left to right in order, so it'll check that node first and if it gets the green light, abort any running branch lower in priority (anything to that Sequence's right).

[uncut slate]

that did it, thanks

[uncut slate]

i set that to aborts lower priority

seems to be working ok

[still crypt]

If you select a decorator it will highlight nodes it will abort in green

useful to visualize these things

[leaden frigate]

Nerv might be right that you want your sequence following the player to abort itself, so that when you can't see the player as it's in that branch, it aborts itself and switches to your wander branch

(set your leftmost sequence to abort BOTH)

...again, behavior trees and I don't usually get along. I'm here as much to learn as I am solve problems 😛

[still crypt]

Abort self will abort all children nodes of a composite afaik, I pretty much never use abort lower prio, but I am no expert

[leaden frigate]

Yeah, abort self will abort the currently running branch, return to ROOT, and reevaluate from left to right

It WON'T abort lower priority, though, so an abort self on your left sequence won't cancel the wait in the right sequence, for example

BOTH will abort it's own children and self, and everything to the right of it in the order tree (but not to the left)

[leaden frigate]

engage: the real question is, does it do what you want it to do?

[still crypt]

🤔 Then @uncut slate can perhaps only use the left most decorator and set it to abort both

[uncut slate]

it seems to be working much better

[leaden frigate]

in theory, yes. I don't see a problem gating the right branch with a bb key, though, even just as a failsafe

then again, if it's not needed, it's one less thing running on tick

[uncut slate]

How do i keep him attacking the player untill he forgets ?

i can see why this is doing what it is doing

but i want it to remember the character for a bit

[still crypt]

Ah, well... there is a way to get a message when a stimulus is forgotten from the Perception system, but I'm not sure if its available in BP

[leaden frigate]

I haven't tried it, but does Max Age timing out fire the On Perception Updated, or is that only on stimuli sensed?

[leaden frigate]

There is also a sight setting that allows AI to still "see" the player within a certain distance, regardless of line of sight, after the initial perception.

[uncut slate]

hmm

[leaden frigate]

There's always a few ways to get where you're goin 😛

[uncut slate]

i'm guessing c++ is better for ai ?

i'm trying to do as much as i can in bp

[leaden frigate]

Don't ask me, I'm not a coder. Strictly blueprint

Realistically, c++ is better for ALL of it

[uncut slate]

makes sense

[leaden frigate]

Blueprint is a sort of shiny accessibility cover for mopes like me

They are made to work together largely

[uncut slate]

where is this "setting" ?

[leaden frigate]

Go to your perception component, select the SIGHT sense, and look for Auto Success Range from Last Seen Location

[still crypt]

I'm a real amateur unfortunately, so I really can't say much for best practices. There're lots of ways to do things, so I'm sure you can get what you want out of BP.

The way I handle this is to override HandleExpiredStimulus(FAIStimulus &StimulusStore) so I can get events when the perception system forgets about a target.

[leaden frigate]

That would be super-helpful to have in BP, I don't recall seeing an event like that anywhere

[uncut slate]

still does the same thing, he runs away when out of sight

[leaden frigate]

I assume because you have that part of the behavior tree aborting as soon as he loses sight

so it goes back up to root, reevaluates, goes "nope, IsPlayer isn't set, that lets me in the wander branch"

[uncut slate]

setting it here, i could not unset it and just have it remember but i want it to forget

[leaden frigate]

Yeah, as you have it, it's only checking if the AI sees the player right now, not if it has seen the player recently

You want it to keep the player as the IsPlayer target until the sense is forgotten (hasn't seen the player for x amount of seconds, or somesuch)

Which brings us full circle to "can you access the Stimulus forgotten thingy in BP somehow" question

[still crypt]

Well, an easy if less performant solution is to use this node https://docs.unrealengine.com/4.26/en-US/BlueprintAPI/AI/Perception/GetKnownPerceivedActors/ and a timer. When the AI sees something start a timer to check if the seen actor is in the array listed by this node. If it is you can still see/remember, if not, set the BB key to null.

[leaden frigate]

That's exactly how I'm having some sheep target grass 🤣

[still crypt]

Have the timer run every half second or so to save you some performance and it'll probably be fine

Don't do it on tick, there's no need to check it every frame

[leaden frigate]

I've got basically that exact setup, with the player BP firing a noise event every 1 s when active, and the AI checking it's percieved actors every 1.5s

Enough time overlap to keep the AI aware of the player as long as it's in range. I've run it with a few hundred AI without problems

[still crypt]

Another good idea for this sort of thing is to add jitter to the timer, so it doesn't repeat exactly every x seconds

That way if you have more than one thing triggering that code they won't all run on exactly the same frame

[leaden frigate]

I did notice some of my AI going "dumb" when there were a few hundred all trying to sort out which node out of ALSO a few hundred was the closest untargeted node to them, but I think that's expected at that point

Is AI pooling a thing? Like, sort them into arrays, iterate over them in order, to avoid them all trying to go off at once? First AI Array A, THEN AI Array B, etc?

(I shouldn't need hundreds of complex AI for my current project, I'm just curious)

[still crypt]

I think that's more or less what Mass/ECS design is about

[uncut slate]

how do i set the length of when it can forget ?

[still crypt]

You're gonna need to poll, so your timer needs call itself every x seconds (x should be as large as you are comfortable making it)

and if the player is not found, it stops calling itself

So set the time to like, 0.5 to start, and then just use the true branch of the conditional to loop back into set timer by event

[still crypt]

Set the time using https://docs.unrealengine.com/4.27/en-US/BlueprintAPI/Math/Random/RandomFloatinRange/

[uncut slate]

it works ok, but i would like to set the time he forgets

[still crypt]

You do that in the perception component

[leaden frigate]

That's the Max Age setting under the Sight sense

By default it's 0, so it's never forgotten

[uncut slate]

ok that's not too bad

[still crypt]

yes, also, I suggest triggering the timer if your cast succeeds, and not if does not - since this polls Perception it will not forget until perception does, and you only want to do this for the player (since that is what the BB key is for) I am not sure what your perception set up looks like but that event can fire for lots of actors that are not the player

and you don't want to start timers for them

[uncut slate]

well if the cast fails it shouldn't even go there ?

[leaden frigate]

Since this is coming out of a cast, won't ALL of this only fire if the cast succeeds?

[still crypt]

Oh yes

[leaden frigate]

And then the timer will only repeat if the Player object is percieved

[still crypt]

my mistake

[leaden frigate]

It happens, code melt brain

[still crypt]

Mistook the branch for the cast 🙃

[leaden frigate]

lol

I've done that with isvalid checks too often

[uncut slate]

why do i want to loop back to timer, it runs when input is put into it ?

that would make sense

first time i used a timer i'm guessing it executes after the set time ?

[leaden frigate]

Wait, how are you triggering all this in the first place?

[uncut slate]

it seems to be working, i still need to work on the tree a bit

[leaden frigate]

So that's gonna fire when the Perception component first percieves the player

As long as it's still perceiving the player, it won't fire again

[uncut slate]

it fires when i go out of sight also

so when i go into sight, or when out of sight

[leaden frigate]

Well hell, that was one of my earlier questions 😆

Just use a friggin flipflop then 😆

[still crypt]

Er the timer is triggered by the false branch of successfully sensed

so the timer starts running once you go out of sight

[uncut slate]

makes sense

that's when i want it to run and check if i've been forgotten

[still crypt]

but the timer will only run one (unless you check looping) , and after 0.5 seconds it checks to see if the player has been forgotten - it probably has not

at this point, you want to wait another 0.5 seconds and check again - so that's why the timer loops back to itself

[leaden frigate]

Essentially, this isn't checking if it sees the player, it's checking if it remembers the player

[uncut slate]

sounds legit

[still crypt]

The reason you don't just use the loop checkbox on the timer is because if the player is forgotten, we don't need the timer anymore

so having it just not queue itself saves us having to clear it from the timer manager ourselves

[leaden frigate]

That actually reminds me, I think I DO have a timer running eternally somewhere. Whoops.

[foggy moth]

All of this action bodes a question... i have a spawner that spawns 5 AI (same classtypes) at the same time. The FIRST time this spawner spawns enemy AI ... the perception perceives the player pawn without error....

ANY OTHER time however - the perception never happens. It perceives FRIENDLYS (the same enemy AI class) but never the ENEMY (Player).....

I"m looking to start troubleshooting this ... but i'm up a creek without a paddle... why would this behave like this?

i would assume AIController is spawned 1:1 to each pawn yes? Not a global controlelr class per Pawn(subclass) ?

[still crypt]

Well, I have no immediate idea, but do you mean the first of 5 words the other 4 do not, or the first batch of 5 work?
As I understand it yes, each pawn has its own controller instance (they can all use the same class)

And when you say perception does not work, do you mean in code? Have you used the Ai debugger to visualize the perception component?

[foggy moth]

first batch of 5 work

any othe rbatches do not

AI Debugger ... yay... 1 at a time

when i have 20 enemies on teh screen :/

i've settled for print string - so i can debug them all at once.... the first batch of 5 set a variable to the AIC .. for the pointer to player perceived.

The rest that spawn run right past my player - and never set this pointer :/

[still crypt]

Well, you only need the debugger for one of the not working ones, which sounds like most of them... just to see if the Perception component knows about the player, but post the code/bp where you set this pointer, it might be that the later AI are perceiving the existing AI and overwriting something

[leaden frigate]

How do you have it differentiating between friendly and hostile?

[foggy moth]

they for sure perceive the eexisting AI .... but that should return as FRIENDLY/sameteam... because the TEamID are equal.....

When these spawn and i log the perception - the PLAYER PAWN is not in this list of percieved actors. .... like its invisible to them.

which 10000000% is not the case.

[foggy moth]

https://www.youtube.com/watch?v=HwBdnviT2vs

[vernal vector]

how do you make the tree jump to another task? for example, a grenade landed next to the enemy, so the BT needs to jump to task to run away from it