gameplay-ai

[dense owl]

Something to do with the paw actions component, tho idk what that is used for

[full wing]

Yeah, i search online and didnt find the reason for using it too

[celest python]

its a legacy system

that didnt get removed

[primal vigil]

guys wdym is good to use something built in unreal for ai enemies or it is worth to train ai with python on map and then use this training for its movement ?

[fading field]

Quick noob question: how do I check for distance in my behaviour tree?

[harsh storm]

Considering games have been built for decades without training AI the way you're describing, you don't need to. And personally I don't even think it'd be all that beneficial right now. But that's up to you.

[harsh storm]

You can store the target in the blackboard, then write a task or service or decorator that gets the current pawn running the BT and do a distance check like you typically would in raw BP.

[fading field]

Thank you!

[primal vigil]

I have same opinion , but let's say it's plane combat game , I think everything including combats can be done with unreal itself and behaviour trees no need training , right ?

[harsh storm]

Plenty of plane games have been made without AI training, so yes.

[dire jewel]

Hi all I'm a game artist but I'm interested in learning about programming game AI. I found the 'Game AI Pro' website that I've so far found really cool and insightful. Can anyone recommend any other resources to begin learning more about actually coding the AI rather than theory and practices?

[celest python]

Check pinned messages

we have both

You'd start with basics of programming, then C++ and then finally after AI programming though

AIModule is ruthless, expects you to be familiar with some advanced concepts upfront (unless if you're going to do simple things)

[stable patrol]

have you considered finding some existing ai tools and working with those instead of trying to build a solution yourself?

[tawdry zephyr]

This is either the correct, or exactly the opposite, channel to post this in but... Its a pain when you want a player controlled character to use pathfinding to move to a location. Gotta give it an AIController, update possession, then use AI MoveTo. And I started wondering if there is a good reason why a player can't just pathfind the same way without the use of an AIController? Turns out, this limitation existed for no good reason whatsoever. I made an ability node for GAS that does exactly that. Even better, players can "fight" the movement, so if the pathfinding gets trapped on something like a tree, they can nudge the character towards the goal (of course, you can just disable movement input if you don't want it), which isn't really a thing with AIController method

In this video he's pathfinding towards the cone actor, and I'm fighting it once he gets close

I wonder why Epic never added this, it was exceptionally simple once you're familiar with ability tasks and AIMove To, its common in many games such as GTA where you try to get in the car door and it runs around the vehicle, also for interactions, or scripted cinematic events, etc.

If anyone wants to do it themselves, can probably do it better agnostic from gameplay tasks and PR it to engine:

• Duplicate AITask_MoveTo, rename something like PlayerTask_MoveTo I guess (something that infers its for player controlled characters not AI
• Change all references to AAIController to APlayerController
• Spawn a UPathFollowingComponent* (see UAIBlueprintHelperLibrary::InitNavigationControl)
• Recreate all AAIController-only functionality within the PlayerTask_MoveTo node itself with the help of the path following component

That's about all it takes, I don't have time to PR anything atm tho. I'd add a few more features like ignoring move input and a max duration
Absolutely bizarre that this isn't in engine already 😄

[lean tulip]

So I followed the Learning Agents tutorial, but I keep getting this error every time I start training. The red errors seem to start as soon as it's ready for the first iteration and the editor freezes for a bit before the error start spamming the log

[lean tulip]

This comment seems to be the solution
https://forums.unrealengine.com/t/tutorial-learning-to-drive/1275490/10?u=conversefox

[lean tulip]

A value of 45 is working for me

[north oriole]

Tbf AI in games has always also kinda sucked

[harsh storm]

Once you get used to them, sure. But many many games have had pretty good AI on release.

The fine line of AI is that you want it to be challenging, but not completely roflstomp the player. Or else they'll complain and stop playing the game.

So you make tradeoffs in favor of the player quite often

[nova prawn]

Anyone happen to know how you can assign who is Enemy or who is Friend when using AI Sight Perception please? At the moment I have 3 enemies but they seem to detect each other as well as the player.

[uneven cloud]

ML won't make it any better.

[uneven cloud]

By assigning them team IDs.

[uncut wolf]

ML absolutely can make it better. But it's an involved process that is only viable in specific circumstances.

Just look at how alien isolation is widely regarded as having some of the best AI for its time, and it uses machine learning

Granted you unequivocally don't need ML to make a plane game

[harsh storm]

I don't recall hearing that they used ML. They used BT's and a AI director similar to L4D.

I believe AI & Games even covered Isolation

The Alien's progress was gated as well.

https://www.youtube.com/watch?v=Nt1XmiDwxhY

Yeah, he did

[uncut wolf]

Ah, yes, it seems you are correct

[gritty lava]

Making the enemies in my game and I started using State Trees instead of Behavioral Trees because State Trees make more sense in my head. Do you guys think this is a bad decision? People online are saying that you shouldn't do much except play with it since it's an experimental feature

There's also very little content I can find online on STs and I'm just winging it with how I make them since I'm not aware of the "Best Practices" for how to structure them etc.

[harsh storm]

If you're still in your learning phase, I'd say stick with BTs. Far more battle tested.

Far more resources if you get stuck as well

ST's are still fairly new and can be buggy for some

[gritty lava]

I used BTs at the start but I couldn't understand why I couldn't check a variables value in order to move from branch to branch. It only allowed me to check whether a variable was "set" or not which confused me and then I learned of state trees which worked intuitively how I would expect them to

Guess it's time to watch some tutorials on BTs

[dire jewel]

Thank you for the direction!

[celest python]

Not similar to L4D, Alien was purely sense driven

[dire jewel]

I haven't yet as I have only just begin this journey but it is something I will certainly look into!

[harsh storm]

It uses a director system as well. Not the one exactly like L4D

[celest python]

I saw the BT via a modding tool and didnt see any director mechanism, but there was a top-level script based manager

[gritty lava]

Are all enemies supposed to be done through a system like BTs? Or do some types of enemies work better if you just manually code their behavior? I'm thinking of games like FF7 Remake that were made in UE4 and I wonder if bosses in those games are made with things like BTs or just coded by hand

[harsh storm]

BTs aren't the only way to do AI

You can do state machines if you'd like

HPN's as well

Utility AI

etc

[celest python]

Old FF games used a mix of FSM & BT

It was their inhouse tool so they werent limited with what AIModule provides

There are a lot of cases where using FSM instead of BT could help in UE, but manually coding AI is rarely beneficial. You need to compose systems into controller and communicate with them properly

[harsh storm]

https://www.gamedeveloper.com/design/the-perfect-organism-the-ai-of-alien-isolation

AI & Games written article about the AI system of Isolation

[celest python]

I know, but its not exactly true.

This is rather similar to an approach made in Left 4 Dead in which a stress gauge was used to prioritise enemy attacks

https://github.com/MattFiler/OpenCAGE

BT is available to everyone

Some parts of Alien AI also relies on RNG

There is 20% chance you can always get caught to Alien even though you're fully stressed or not

My first UE relevant job was to analyze Alien Isolation's AI and implement it to UE

[deep bramble]

I have a problem with re-reaching any Move To with my Ai. They can reach the target actor with Move To only once. Subsequent attempts to reach that same non moving target actor result in the Ai character stopping one unit shy of the target.

The goal actor has an overlap and it only is triggered the first time the Ai reaches it. What would cause something like this to happen? There is no dynamic nav mesh or any obstacles in a flat land testing environment it still happens.

For more context it’s a CTF style game and the Ai moves toward a flag, overlaps it then has key values updated so it moves to the capture zone. Then the flag resets and it randomly chooses another flag to move towards but if it chooses the same one it always fails to reach the target goal. I’ve tried adjusting the Move To settings a bit and the problem is consistent. It only works the first time.

[harsh storm]

Doesn't mean you did it correctly 😈

[celest python]

Sadly after I left, they found a non AI programmer to continue and turns out he ditched whatever I did and implemented something very far away from what Alien AI is

I had a chance to play their demo at a conference this week and I was keep dying

Hmm, I think demo is available to everyone https://store.steampowered.com/app/1987400/Death_Relives/

[dense owl]

Are you using onbeginoverlap?

[deep bramble]

yeah

[dense owl]

Part of the problem could be if already overlapping it won’t fire

But if you’re always just getting to it from the outside it’s something else

I think you said it can sometimes pick the same one, but not sure if you meant right after or later on

[deep bramble]

The Ai NPC spawns, randomly chooses a flag to Move To then eventually reaches it and overlaps and runs the "pickup flag" logic. That all works fine. It then Moves To the capture zone across the map and that works fine. Then it randomly chooses another flag to do the same thing. If its a different flag it works without any problems but after a short while it will eventually choose one of the flags its already captured at least once as the next target flag. This is where it all goes wrong, when it executes the Move To it will run towards the target flag and even appear visually overlapping the target flag but the flag's On Begin Overlap isn't executed anymore. It's as if the collision channel changes or something so the overlap doesn't fire ... but I'm not changing that.

My game logic allows for flags to "respawn" and be captured multiple times but the Ai characters can't seem to pick them up again.

I as a player character can pickup and catpure flags multiple times without any issues. Same with other clients its only Ai characters that can't.

[dense owl]

How do they respawn, do they get destroyed first?

[deep bramble]

They don't actually destroy or respawn just toggle visibility and toggle state on character who picks them up.

[dense owl]

🤔I’m guessing this state toggle is not specific to each flag

[deep bramble]

The repnotify on the flag appears to be working correctly for when its available or stolen.

[dense owl]

I’d maybe do a check on the collision channels after the first pick up, and whatever allows a flag to be picked up or not

[deep bramble]

yea its probably something I've done or left while debugging and forgot forwhere. Likely a change made to the collision for the flag but on some other blueprint somewhere just for testing purposes ... ughhh

[dense owl]

Yeah, it’s gonna take some debugging

[deep bramble]

Turns out I was setting the wrong capsule's collision when bFlagStolen was changed. 😆

Dunno how it was working for player characters though...weird.

[dense owl]

Hehe happens

[tawdry zephyr]

In fact, a lot of players enjoy being able to dominate in the later stages of the game, it makes it feel like their hard work paid off
Its a very specific type of game that lets the AI grow to counter the player

[uneven cloud]

Name 1 game that used ML and had better AI. Alien Isolation did not use ML.

ML isn't new. It's been around for years. Even Unity has it built in. Yet it's not widely used, because it doesn't make better game AI.

[uncut wolf]

Alien Isolation did not use ML.
we established this one quite a while ago

[uneven cloud]

Are you just going to ignore the rest of the comment?

[uncut wolf]

Well yes, if the entire basis of my argument was flawed, and it was corrected, there is no argument left.

There ain't much left for me to argue against if I was initially mistaken :P

[tawdry zephyr]

So it turns out that UE5 does have a move to node to use pathfinding to move to a goal for PlayerController (instead of AIController) which is only usable with gameplay abilities
It requires a couple of components to be added to the Pawn but doesn't seem to update acceleration, so character slides instead of applying animations
There's probably a reasonably easy fix, but I wanted to do things a bit differently, and I've also added a node for use outside of gameplay abilities
Its free here if anyone wants it
The goal is to provide pathfinding for PlayerController, for use-cases like making them run to the car's door in GTA, or towards a lever before pulling it, or auto-move (eg. horse following road in some games)
https://github.com/Vaei/PlayerMoveTo

[nova prawn]

Ok this has me stumped a little, I have a super basic AI system my project runs at 120 FPS as soon as i enable AI debugging it tanks to like 20 fps... Any ideas why it kind of makes debugging 3 AI Characters a bit hard when the editor barely allows you to show 1 character AI tools if i put 3 the editor fully hangs for ages.

My pc is a 13900k , RTX 4070 and 64GB of DDR5 cant remember the speed and Windows 11.

Oddly enough I do not remember it tanking this bad with my old PC ( 8700K 32GB DDR4 and a GTX 1070) xD :S

Here is a image showing it,

[flint thunder]

Are there any methods i can do to somehow delay BT tasks?
I have a controller that spawns enemies when their number drops below certain threshold, and a task that if there are not enough enemies it spawns more
But now new enemies appear almost instantly when i kill some enemies, and that does not look great
I could add wait node, but that will stall whole combat BT, which is undesireable

[harsh storm]

This doesn't sound like it should even be in the BT to be honest. I'd put it in a subsystem or GameState with a higher preference to a subsystem (World subsystem to be precise).

[twin marsh]

Struggggggling to understand why my AAIController::MoveToLocation seems to ignore pathing…

I was looking in the source and saw something called UE_VLOG, and started playing with the Visual Logger for the first time and came up with this image.

The method has a bUsePathFinding parameter that defaults to true and I've tried explicitly passing true as an attempted sanity check, but the agent just ignores the obstacle and tries to follow a straight path????

Anyone have any idea what could be misconfigured? Or perhaps another strategy to debug this?

[twin marsh]

https://tenor.com/view/pray-beg-please-homer-the-simpsons-gif-15706311

[waxen tiger]

Has anyone able to find a nice way of doing the equivalent of search for references but for blackboard keys?

[rich pendant]

Im not sure if this is the correct channel but I'm setting up some EQS for my AI and I'm wanting the EQS to pick any point on the nav mesh (x distance away) even if they can't directly walk to it. I can't seem to do this, does anyone know what I might be missing?

Edit: Never mind, I figured it out. I was using the Pathing Grid instead of Simple Grid.

[foggy moth]

I have some remnant AIControllers sticking around after killing off my AIBots in a game... and their behavior trees are stacking up huge - lagging up my game bad even when no enemies are on the screen....

How can I debug this - and how can I control a stale AIController that has no pawn so as to kill it off adminstratively?

what i'm asking mroe is - is there a lifecycle event in the AIController or even ACharacter i can rely on to do this foor some overrides - or should I come up with lik ean N# second timer that checks if it has a controlled pawn - if not kill it off?

[uneven cloud]

Spawning is something that should happen outside of the BT. Usually in a spawner or a subsystem.

[uneven cloud]

What do you mean by search for references?

[flint thunder]

To elaborate a bit, i do have a spawning subsystem, but the controller is responsible for telling it when and where to spawn (so we will have assasin coming in from the side, and stuff like that)

[uneven cloud]

You likely have a hard reference to the AI controller, which is stopping it from getting garbage collected.

When the pawn is destroyed, it unpossesses the AI controller and cleans it up.

[flint thunder]

I do have a subsystem for nitty gritty but i do want to have some decisionmaking involved when and where to spawn stuff
combat controller also tells enemies to do speciall attacks, and to not attack player at once

[foggy moth]

where would i look for hard references? These would be a pointer addressed somewhere correct?

[uneven cloud]

It would be a pointer saved to a member variable somewhere. You'd need to search for it.

If you are in code, you should be using weak pointers for anything that the object doesn't own.

[foggy moth]

the more i think about this - the less it adds up.... theres ghosted AIControllers hanging around. its not a 1:1 of hte enemeis that WERE SPAWNED... it slike 5 remaining of the 20 that i've killed.

[dense owl]

Are they a specific class ?

[foggy moth]

say an AI failed to spawn for whatever reason (collision with landscape) - but the AIController spawned (i've witnissed this happening in spawn logic) .... would the controller hang around for whatever reason at that point?

[foggy moth]

sure - i've extended AIController for my own project needs - does that somehow change things?

[uneven cloud]

I wouldn't put that in a BT. Decision making doesn't always mean a BT.

[uneven cloud]

The AI controller would still be cleaned up. Unless you have a hard pointer to it.

[foggy moth]

checking code I have 0 hard refferences towards the AIController class

i'm going to make a visual logger with some output so i can at least see their existence physically... find out whats happening.

[dense owl]

I meant like a specific bp class being spawned that may have some forgotten hard coded ref

But it sounds like it’s something else

[lyric flint]

Is it safe to assume that services on the same BT node will execute top to bottom (i.e., the first service will finish before the second one starts)?

[boreal sundial]

Hi, is there a good way to bind arbitrary data about perceived actors into the AI perception system?
I'm using BTExtension's Utility selectors for most of my AI and trying to reference games like Rain World.

I need AI to make judgements on one another. I'd ideally want a way for any AI to store info about others as a struct which I can very easily read and modify during gameplay? E.G: Character A attacks Player by default, but through interaction A's Fear stat towards Player may be high enough that the utility selector causes A to avoid Player instead.

Has anybody had to design something like this? I'm not sure of a clean approach that's easily managed.

[foggy moth]

dont Services run at their own tick interval - hence they are their own entity - not any order system amongst N# of services anywhere placed....

[lyric flint]

I should probably clarify - will Service A's Execute AI function finished before Service B's Execute AI does

[foggy moth]

Services - dont have Execute AI - do you mean tasks instead?

[lyric flint]

Ah I'm completely out to lunch. Let me figure out what I actually mean and I'll get back to you, thanks. 😄

[frank lagoon]

Is there a way to create a nav mesh volume at runtime with blue prints?

i want the range the ai can move around in to change based on in-game events

[uneven cloud]

It is not safe to assume that.

[uneven cloud]

I have made a system like that and no you don't want to bind it to perception.

[boreal sundial]

What did you do for your system? I'm curious what you mean by that

I'm honestly not entirely sure how to approach this system. I know I want my utility AI to use information about others as weighting

I know I need to influence these stats from anywhere (I.E: Weapon hit event -> change fear between two characters)

I also know this sounds like a huge amount of sphagetti if I don't find a good clean/extensible way of doing it

[uneven cloud]

By creating a history system. Each history record (gameplay tags identifier) has all the data it needs. You push history data when things happen, typically want to save it using a guid so NPCs remember things about the player(s) through play throughs, and anything can ask questions.

[boreal sundial]

I'm not sure I'm familiar with gameplay tag identifiers or guids?

The documentation on guid tells me about how to use functions about them, but not what they... actually are. As far as I can tell.
If I had to guess this looks like a reference system for tagging unique characters so information about them can be recalled and modified when needed?

Is this related to the gameplay ability system stuff that was released a while back?

[tawny locust]

what guids are is just a random number. guids have nothing to do with GAS, or even Unreal, they are just a programming thing.

GameplayTags are FNames++. they originated from GAS but are now a seperate thing

[lyric flint]

I have the following use case I'm struggling with. I have two services: the first sets the Combat Target; the second runs an EQS query using CombatTarget as context to find a CombatLocation (where best to attack from). The second depends strictly on the first, but I'm unsure how to enforce this, either in the behavior tree or the EQS query (or elsewhere).

[twin marsh]

For posterity, this appears to be related to the Experimental World Partition Navmesh. All the classes work fine in a new (basic) level 😅

[uneven cloud]

Gameplay tags are special FNames. It's often used as an identifier of things. Let's say you have a history record for number of x things killed by the player. You could use a gameplay tag of History.Record.Death.XType. They are useful for giving readable names to things and they have a lot of functionality for lookups.

Guids are unique identifiers for objects. Typically used for things that are saved/loaded.

[uneven cloud]

You enforce it by putting it higher up the tree. Then you only run the combat location query if your combat target is valid.

[lyric flint]

Ugh. Of course! Thanks. It seems so obvious now.

That also has the nice side effect of forcing me to consider behavior if the target is invalid.

[uneven cloud]

Always have a fallback behavior!

[boreal sundial]

Oh that makes sense! I wasn't aware tags could be used to store information like floats or ints in that way. That definitely sounds like the way to go.

If I'm understanding correctly, anyway?

[uneven cloud]

You use the tag as a key to a value in a map.

[boreal sundial]

Do you have an example of that in your project? You mentioned you've done something before along these lines?

You've been super helpful, this feels much more on the right track than my original idea but I'm not sure what implementation of gameplay tags looks like for this sort of data stuff.

[tawdry crag]

Are there any gotchas with navmesh raycasts that could give false negatives? I'm firing off some raycasts from the top of this balcony to a nav location below and those rays absolutely should be blocked, but calling Raycast on the RecastNavmesh is returning false (not obstructed)

It's also not filling in the HitLocation variable, which is broken as per the comment (though I don't trust the comment to be correct)

     *    Synchronously makes a raycast on navigation data using QueryFilter
     *    @param HitLocation if line was obstructed this will be set to hit location. Otherwise it contains SegmentEnd
     *    @return true if line from RayStart to RayEnd is obstructed
     *
     *    @note don't make this function virtual! Look at implementation details and its comments for more info.
     */
    FORCEINLINE bool Raycast(const FVector& RayStart, const FVector& RayEnd, FVector& HitLocation, FSharedConstNavQueryFilter QueryFilter, const UObject* Querier = NULL) const```

Using a default query filter FWIW

[tawdry crag]

hmm, stepping through the only place where I could see it maybe projecting onto the navmesh below the balcony, though I can't imagine why that would be "closer"

[uneven cloud]

Yes. I've done this several times. Do you know how to use a TMap?

[lunar grove]

Hello, is it possible to change the colors used to display sense range? I have multiple hearing senses, and they're both of the same color. I only found how to change the stimuli sphere color.

[boreal sundial]

You mean this data type at the bottom?

I've used it in blueprints but not in c++, I imagine it's very similar though.

Would I make a map of like... [gameplay tag type] : Int?

[uneven cloud]

Yes, that data type. It depends on what you need to store. That might be ints, floats or even your own struct.

[boreal sundial]

Would it be wise to nest them? Is that possible?

Like, GUID: Struct

and in the struct is a bunch of gameplay-tag:variable maps?

I'm not entirely sure how to set it up. What I'm learning is I probably want all of this to live as a singleton or some other not-attached-to-characters-at-all way and just compare guid data? Assuming a guid is a unique reference to a pawn

[lunar grove]

Apparently UAISenseConfig_Hearing::DescribeSelfToGameplayDebugger() is what prints and draws the range, and it's hardcoded to always use yellow, as well as cyan for rangeLoS. I guess the only way to change the color would require to override the UAISenseConfig_Hearing, expose the HearingRangeColor, and override the method which would use the exposed properties instead of the hardcoded values. The PerceptionComponent would need to use the custom config instead of the default one.

[dreamy surge]

how do we get the nav mesh to cover landscape so I can walk on it?

[boreal sundial]

Ah! This is an issue of the navmesh agent not having a high enough inclination. Basically it's skipping those bits of the landscape because you've told the navmesh it's too steep for your characters to go over so it won't try.

I believe the navmesh project settings settings has an "agent max slope" or "max step height" variable you can mess with.

[dreamy surge]

@boreal sundial yeah the MAX AGENT SLOPE only goes up to 89 and it didnt make much difference

same with max step height

its still an issue since the AI cant walk there

[uneven cloud]

Why would you do that? Stop overthinking it and build something simple.

[boreal sundial]

I'm not sure what the minimum product is here. These are all moving parts I'm not familiar with.

OK so I'm guessing I just want game tag : value in a singleton somewhere

And my AIs just grab that info and compare their guid to a target's to figure out a relation somehow?

[uneven cloud]

You start with the simplest version. Not the MVP. You need to start with V1.

[boreal sundial]

Right, I'll try and assign some values to gameplay tags and see if I can access them through my AI controller and get back to you

Thanks for the help btw

[boreal sundial]

What if you try messing with merge region size? I'm out of ideas at this point though, I'd suggest just fiddling with each of those settings until it gets closer to your goal. I don't see anything specifically about that terrain that'd be giving you a problem, and it looks like your nav area does fully enclose the terrain which is good

[lyric flint]

One message removed from a suspended account.

[obsidian igloo]

anyone know what the AI Behaviours plugin adds in UE5? I cant find any documentation on it

[uneven cloud]

Tutorials show a way to do something. Not necessarily a good way. Depending on the skills of the person making the tutorial, it's often a really bad way.

Yes it's possible to detect a door via a BT, but using a nav link is a better way.

[uneven cloud]

I believe that is the new gameplay behaviors stuff. They are like AI tasks, but don't need a controller.

[cursive star]

is there any way to use names instead of ID's for ai controllers in the editor?

[uneven cloud]

That is the name of the controller.

[dense owl]

They are instances of the same AICon, only thing you can change is its name as Luthage said

[subtle sleet]

Hey people, I have a question. I use Perception system but sometimes the system registers an actor but when still in view it loses sight for a few seconds while the other actor moves. But there are no objects in between

[dense owl]

Yeah and how are you detecting that, onPerceptionUpdated?

[subtle sleet]

I use this, so it tells the behavior tree that there is a target in sight

[dense owl]

Yeah, so what I just said lol

[subtle sleet]

but sometimes it loses sight for a few seconds, when the target is moving

[dense owl]

Yeah that node is not very reliable because of what it considers an update

Better to use EQS and the perceived actors generator imo

[subtle sleet]

Thanks!

[lyric flint]

Are your perceptions expiring? That node is fine to use.

[limber prawn]

So I'm pretty new to behavior trees, i understand what services/composites/tasks are, but i'm not sure what would warrant a service, and what logic should be executed on an actor. Is there a general convention for what services "should" do?

[unkempt pulsar]

Is there a way to temporarily increase the navmesh navigation cost in an area?
I've got an oil barrel that when shot produces an oil puddle on the ground, and I want my NPCs to avoid walking inside that area if possible, or if they're already inside of it, to get out. I figured a neat way to accomplish this is to make it more costly for their pathfinding to walk in the oil

[silent torrent]

Hello I wanted to ask regarding why I can't set a default value to an array in a level blueprint

[keen crow]

you can try spawning nav mesh modifier area and creating custom navigation query filter BP asset (which is set in AI controllers default nav query filter) where puddles approximately are, but you might need dynamic navmesh generation enabled in project settings to get it working, not sure

[alpine rover]

anyone know any good tricks to make chase ai more engaging? i was thinking about formations but there is very little space in my level design for those to be any useful.

i wanna know if i can implement dynamic flanking

for a maze type level

[uncut wolf]

you can indeed add that, it is possible

pac man did it :P

[unkempt pulsar]

That worked, I had to enable dynamic navmesh, and then spawned a nav mesh modifier area, and set it's area class to NavArea_Obstacle and it's good enough

[dense owl]

You can run an EQS query as a service for example. Like a perceived actors generator that stores a target in a bb key

There are lots of applications but for starters, think anything that needs to be checked at a certain interval, like you would normally do using a tick/timer

[dense owl]

Watch GDC talks on AI

[limber prawn]

Gotcha. I know there's like a million ways to achieve any goal in game development, and I think I'm just feeling a bit overwhelmed by choice with services in the mix. I'm kind of just thinking out loud here, but if I wanted the NPCs to constantly check the players HP (or some other attribute) I could do that with a service, or with a delegate on the NPCs that fire when my players HP changes. I haven't done anything with EQS yet, so maybe after going thru a little tutorial with those it'll be a bit more clear

Anyway, ty 😊

[dense owl]

Watch 3rd pinned link video in full

[limber prawn]

Will do 🫡

[uneven cloud]

Nav areas are what you use to change cost.

[ember storm]

Stuck on what I would call a dumb issue, feel like I just forgot a flag somewhere maybe someone can help.

I have AI enemies that navigate around, then when near the player, attack, I need them to turn smootly towards the player, then attack, I'm trying to do this by setting control rotation in a BTTask.

My enemy has :
the "Use Controller Rotation Yaw" turned off.
"Use Controller Desired Rotation" turned on.

they are unmoving when preparing to attack, I set their facing direction using SetControlRotation, then in the next frame it resets back to what it was before, before it even renders.

For the life of me I can't figure out what I forgot. There movement is nice and smooth.

woop, nevermind I found it, AIController:bSetControlRotationFromPawnOrientation needs to be false.

[rich pendant]

I have a similiar question as above lol. I have some NPC's setup that use the perception component to track actors they can see/looking at. This updates the control rotation which then drives head turning. This is all good and works, but I'm not wanting to rotate the characters whole body to face the player when they instigate a conversation. The Rotate To BB Entry changes the control rotation which isn't what I want. Is there anything else I can use or will I need to make my own task that rotates the actor itself?

[limber prawn]

The EQS section has been very helpful :) I watched this a while ago but I don't think I watched the EQS part. Thanks again!

[uneven cloud]

It's a lot better to use the tools than to hack in your own version. The movement component has smooth rotation functionality for control rotation, you just need to use it.

[uneven cloud]

Look at should not use control rotation. Look at is typically done in the animation bp.

[ember storm]

I didnt hack in my own version, I just had to set the right flags to get it to behave how I wanted, works fine now. just had to set that last flag

also, if you had read what I said, I am using the smoothing in the movement component. I just had to disable the controller from copying over the pawn rotation into the controller when there was no focused target, allowing me to control the controller rotation in tasks

[rich pendant]

The head movement is done in the anim bp. It turns the head to match the control rotation (clamped).

It's the perception manager that rotates it based on what it sees. This is because the perception manager uses the control rotation so as far as I know it's the only way to have the head and body rotate independently.

[uneven cloud]

Your problem is that you are using control rotation to set the look at instead of getting the target independently.

The perception system does not do any rotation or sets focus on a target.

[rich pendant]

I'm not sure what you mean?

The perception component is orientated based on the control rotation. Setting focus rotates the control rotation. I don't want the NPC to rotate their whole body at what they are focusing on, just their head. Naturally, with the combination of the animbp, the perception range follows where the head is looking which is what I'm wanting.

It does sound like I'll need to manually rotate the actor itself though.

[boreal sundial]

OK I'm not sure if this was the best way, but I made a world subsystem with a function to compare two actors along a gameplay tag and return a value if there's one.

I'm not sure the 'scope' of UWorldSubsystem though, the documentation hints my data will be lost upon changing levels so I guess I'll need a way to avoid that but it SEEMS to be working within one level.

[uneven cloud]

The perception is oriented based on the pawn's rotation. Setting focus rotates the pawn to match the control rotation.

Your problem is that you are using the control rotation for look at, instead of independently moving the head.

[uneven cloud]

The scope of a world subsystem is the lifetime of the world, so changing levels will lose your data. Game instance subsystem would have the lifetime of the game.

[boreal sundial]

OK so I should change my class to that, and just remember to delete any data relating to characters that die or aren't valid anymore

thanks

Speaking of, I seem to have an option between get GUID, GetUniqueID, and GetObjectName.

Say I have a character I wanna track, I leave it's level, and re-load the level. Which one of these three can I reference and know that it will still remember that character when the level changes around like that?

[uneven cloud]

GUID. GetUniqueID are the object IDs that are given when it's instanced, but those are recycled. Object name will not always be the same as it's usually ClassName_C_number.

GUIDS really only work though if you are saving and loading the character when you reload the level.

[quaint marlin]

Alright, starting to get these state trees a little bit

[rich pendant]

That's not true, the AI perception uses the control rotation. If I tell the pawn to use the control rotation, it'll align with the rotation of the character. With this unchecked the base pawn and the AI perception rotate differently, which is how the character is setup. (I do have the pawn rotate to the control rotation when moving)

Test it yourself if you don't believe me.

[boreal sundial]

My intent is to copy what RW did and add nest objects to my world which are associated with a particular character, and the nest will spawn a fresh instance of that character each time the level loads before applying remembered relationship info or other things I care about to them?

I don't think I need to have any real character saving outside of the player itself for simplicity sake.

[uneven cloud]

I've been in the code. I know what it does. It gets the view point FROM THE PAWN, which I override to use a socket for the eyes location.

[rich pendant]

Ok, so how would I do this then?

[boreal sundial]

OK I think this will work thank you

[uneven cloud]

You override the function APawn::GetActorEyesViewPoint()

[rich pendant]

Ahh it doesn't look like I can override that from BP. :/ I might need to have a think about how else I can setup the pawn.

[keen crow]

Is there anything to override to calculate the "weight" of a navlink proxy during path building? i.e. I would like to make a path over NL 1 less favorable rather than NL 2 if there's already somebody is using or is going to use NL 1

[uneven cloud]

Nav links can have area classes.

[keen crow]

yeah i was thinking about them but I need something more overridable to actually do checks like

ok NPC 1 can choose to go via NL1 but NL1 is already claimed by NPC 2 and NPC 3 which are very close to me so we are probably going to come to NL1 at the same time but then there's NL2 which is currently not claimed by anyone so I'd rather go there
or do nav areas provide overridable functions where I can put logic like this?

[uneven cloud]

If you know C++, you can change the area class at runtime, if your nav mesh is at least set to regen with dynamic modifier

[keen crow]

i know C++, but what do you suggest? setting custom NavArea_Busy whenever any other NPC actually start using the navlink? It would work, but I think it won't help when a squad of NPCs are going together to the same location and there's a wide wall to vault over in front of them with multiple mantle navlinks. I mean since I would put the nav area only when somebody actually starts using the NL, I'll end up in a situation where all NPCs choose the same path over the same NL since it's not occupied during the path calculation

[uneven cloud]

Is that an actual problem that you are seeing or one you think might happen? I always recommend not trying to solve problems that do not yet exist.

You could make some complicated system that reserves a link, but then you have the problem of them trying to path at the same time. Who then would get the reservation?

[keen crow]

alas, it is a real problem I need to solve right now. what makes it even funnier is that guys who made the original code base actually refused to use ANavLinkProxy and UNavLinkCustomComponent and instead created their own actors and their own component and only implemented INavLinkCustomInterface in that component

as for

could make some complicated system that reserves a link, but then you have the problem of them trying to path at the same time. Who then would get the reservation?
yeah I wanna do something like that, but I don't know the best place to put that logic. Ideally I want to find something overridable in the path following component where it builds a path and sees a navlink proxy and it can give it a float value "weight" or "score" but I just don't know where that overridable is and if it even exists

[uneven cloud]

The good ole "not built here" ridiculousness.

I would start with going through the path, before moving, and finding any links and setting the area class to a custom taken area class. You'd also have to make sure it got reset to default if they abort their move.

You are going to have to deal with race conditions. What happens when 2 try to claim a link at the same time? What happens if someone in back claims is first?

[keen crow]

I would start with going through the path, before moving,
what's the correct method to override for that?

What happens when 2 try to claim a link at the same time?
is path calculation happening asynchronously? but even if so, honestly, at this point i'm ready to just close my eyes on that one. Besides, I want to only add "weight" to NLs, not exclude paths with them entirely

What happens if someone in back claims is first?
if the distance between them is bigger than some X (or better, if the absolute arrival time difference to NL is bigger than T) then whatever - they won't collide anyway. Otherwise set some extra weight even though NPC1 can be a bit closer to the NL than NPC2 because NPC2 has already claimed that NL

[uneven cloud]

I'd start with RequestMove. In there you might find a better place, but not certain.

Multiple AIs can request paths at the same time.

[keen crow]

ok, thanks, I'll see what I can cook with that one

[vestal gale]

Struggling to find an explanation as to why I get weird trace behaviour when I run an EQS query with a trace in "single best item" mode? The trace test seems to either not fire, or not fire correctly as you can see here. Had the issue before, but I'm really not sure what the reason for it is.

I haven't really gotten my head around the different run modes, an explanation would great 😄

[lyric flint]

Is there a way to pass an animation montage to a Smart Object's definition asset on the actor? I'd like to keep SO_Definition_PlayMontage, but I don't want to have to create a new definition for each individual animation.

[lyric flint]

Probably related to this?

Does your generator have auto sort tests on?

[vestal gale]

Ahh thatd explain the weird execution order, don't know why the trace isn't firing at all though. Yeah looks like auto sort is enabled by default

[vestal gale]

From memory that has to be defined on the SO_data_asset, I had a similar question a while back

Possibly other ways to do it though

[vestal gale]

Turning off seems to have fixed the tracing issues too, cheers

[lyric flint]

Yeah it's probably just deciding not to do some of the traces (or some other hand wavy explanation) since you only care about the best in Single Best

[vestal gale]

Gotcha that'd make sense

[atomic minnow]

Hi, does anyone know why a character still perceived by other character after it unregister from ai perception system for a few second?

AI keeps shooting at target for about 2-3 seconds after the target is dead.

I uncheck the Include Know Actors box in EQS query and fix the problems.

[boreal sundial]

Hey I'm having EQS troubles:

I have this EQS and it seemingly works fine, the EQS testing pawn correctly identifies exactly what I want, and printing what the EQS is getting shows me my objects.

...but when I go to BP to run the EQS test like so, it fails? What might be going on?

The EQS is correctly getting all the objects to test according to the print statements but then 'get results as locations/actors' just fails anyway

[uneven cloud]

Single best item doesn't run the last filter test for all items. It runs it until an item passes.

[spring inlet]

i'm trying to execute FinishExecute with succeed in an event callback, is this not valid?

if not, how would i finish an BT Task successful from an event callback?

nvm, issue was that i had the finish abort event implemented -_-

[lyric flint]

Just want to bump this this morning since it seems wild that you can't pass in data to a Smart Object from the component on the actor. I feel like I'm missing a critical step.

[uneven cloud]

I would just make a new behavior class and config that you can pass the animation with. You might be able to subclass the default one and override some things.

[lyric flint]

Awesome, thanks!

[soft idol]

anybody here working with AI code in C++ in 5.3? After updating, we're unable to access the FAIRequestID struct, as it appears to no longer be exported from AIMODULE as of CL-26082269

also I can no longer include AITypes.h

[gusty bridge]

I'm analyzing a blueprint related to AI, but I'm not sure why there are AIPerception and AIPerceptionStimuliSource Component are added in one Blueprint. As far as I know, usually StimuliSource comp should be added in Actor or Character to perceive senses, and AIPerception is usually added in AIController class to use or make functionalities using provided AIPerception functions.. Is there a case why they both have to be in the same blueprint class?

[dense owl]

That’s not what a stimuli source does

A stimuli is perceived by senses, it doesn’t perceive senses

Having said that yes, normally you’d have your AIPerception component on the AICon and a stimuli source on anything that needs to be perceived

[delicate halo]

Hi, how could i force the state selection from an event bound in my evaluator ? (in a statetree)

[vestal gale]

Ahh that'd explain why I'd sometimes get a group of filtered points and sometimes none. Cheers

[normal hearth]

Hi, I think this should not be very difficult to resolve but, for some reason, it is scaping me. I have an NPC that whenever he hears a sound (or sees something at a certain distance) gets intrigued and goes to investigate. The tricky part is that once he goes to investigate I cant "reset" the sequence when he perceives again a stimulus (hearing or "far" sight).
My pretend behavior is:

• When he hears or (far) sees something he goes to investigate (so far so good, even he goes back to his patroling behavior after making his investigation)
• If he hears or (far) sees something again, even if is already executing this subtree, it should restart this behavior (get a new location, go for it, and so on).

"TargetLocation" is changing its value on every stimulus.

[dense owl]

You would prly need to run a service that checks if a new stimulus was detected and aborts that branch when that happens

[vestal gale]

Just a basic question: I have my AI character base stats (health and stamina) defined on the character BP, but I'm altering them on the behaviour tree as well (interfacing to the character on the relevant tasks and services to modify the stats via a BP interface).

Currently every time the AI's stats are modified via the BP interface I call an event to sync to the blackboard. This all works fine, but I'm wondering what the "correct" way to do this would be?
Just have them defined on the blackboard? Or is it fine as is?

[regal willow]

Hey guys i have a problem with some ai. My monster keeps going to his patrol spot even though he sees the player. he only runs after the player when he gets to the spot. it feels like the move to dosent refresh the value until its done.

[vestal gale]

You can select the IsEnemySeen decorator on the left and set observer aborts to Lower Priority. That'll make it cancel execution of tasks in branches to it's right when it sees the enemy, as they are of lower priority (priority of BTs is left to right). By default it'll only go to that branch when execution finishes on the other branch

[regal willow]

Alright so i did what you said but it is still commited to move to the certain spot THEN run after the player.

@vestal gale

[vestal gale]

Weird.. I'm still learning BTs myself so maybe I'm missing something obvious, but as far as I can tell it should abort the current task when the result of the decorator changes

You're sure the enemy_seen variable is set at that point in the blackboard on the right?

[regal willow]

its not set on the right

should it check again.

[vestal gale]

Pause the editor when the AI sees the enemy, then open up it's behaviour tree and double check the values of the blackboard keys on the right here

If enemy_seen is set at that point and it hasn't aborted the other task then you've got a problem (probably not one I can fix)

[regal willow]

the values only change when the move to is finished.

[vestal gale]

What functionality is setting the enemy_seen BB value?

The AI perception system?

[regal willow]

yes its setting it but i have a task getting the values

[vestal gale]

If you directly set the key in the perception event it'll immediantly sync to the blackboard without the need for a task and that should cause the decorator to abort the other task

[regal willow]

ahh

this fixed it. thank you

[vestal gale]

Awesome, no worries 👍

[delicate halo]

Hi, Is it possible with a statetree to get the output of a task in the input of another one ?

[steel kestrel]

Hi everyone. How can I send variable type Actor to EQS context? I have some of bot with EQS and they have different target actor. I need to send this target actor to eqs context for bot. It need for EQS test distance to

[minor geyser]

i am following the quick start guide on smartobjects, it uses a node called "claim", but this seems to no longer be in 5.3, what should we use instead of claim?

[uneven cloud]

You make a context to get the target, not send it.

[uneven cloud]

Why are you altering that in the BT and why are you saving it to the blackboard?

[vestal gale]

I needed the variable synced to the BT in order to fire off logic when at low health. Tasks to increase health are done in BTtasks

Literally just a decorator check on the health bb value is what I'm referring to. Is the right way to do this a custom decorator that gets the value directly from the player or something?

[dawn wedge]

I have a bit of a weird bug, I'm performing a simple Find Path to Location Synchronously to check if the path is valid before spawning the AI and for some reason no matter where I place my end point, the path is valid. So I tried to look at the path points with a debug sphere and noticed that for some reason the path points instead of going to End Point they just go to the edge of the Navmesh and say that the path is valid. Does anybody know what is going on?

[flint trail]

Has anyone used this with AI yet https://www.unrealengine.com/marketplace/en-US/product/0a128683c41f4b59906c661b95ca8655 ?

[sacred shale]

why does my behavior tree show "STEPS BACK: -1" instead of simulating? is it backtracking on itself? in-game my behavior tree is running as expected

[dense owl]

Show the whole tree

[hexed ice]

Trying to make a simple pawn that chases a first person character when seen. Struggling a little as sound design is my background, not AI programming.

I have a blueprint, but the AI will not pursue the player character. I can share the BP, if someone is available to help?

[dense owl]

Watch the 3rd pinned link video in full

[hexed ice]

Would rather someone help troubleshoot, thanks

[dense owl]

I thought you’d rather learn how to achieve that but sure, show your code

[hexed ice]

I just need something simple right now- it isn't using behaviour trees.

I just need something that will move towards the player. Only the player is a first person character and I haven't been able to get the AI pawn to follow

[dense owl]

Pawn sensing was replaced by ai perception for starters

What engine version are you in?

[hexed ice]

5.1 currently

[dense owl]

Prly better to use AI perception

Did you check if it sees the player with breakpoints/prints?

[hexed ice]

I haven't yet

Ive added a print

I'll test now

[dense owl]

Yeah I’d start there, see if the detection is happening

[hexed ice]

It does see me

However it does not move. Navmesh is completely green

So its not like the terrain is too difficult

So far its just a sphere shape. Though that shouldn't be an issue, right?

Does it need skeletal mesh to move?

[dense owl]

Not really but it might need some form of movement component like CMC

And an AI Controller if it doesn’t already have one

[hexed ice]

He's schmovin

He was so fast LMAO

[dense owl]

Lol

[hexed ice]

Where would I find its speed?

I need it to be suuuuuper slow

[dense owl]

Are you using a character movement component ?

[hexed ice]

I used Floating Pawn Movement

Ah!

Max Speed.

Thank you for the help!

[dense owl]

Np

[coral mesa]

I got a question, is unreal engine navmesh deterministic?

Ready for lockstep RTS or something?

[rocky finch]

When using the AI sight perception is there any way to adjust this cone? I know there is peripheral vision radius but I see nothing for the 'vertical cone'.

[dense owl]

There’s an angle radius setting

[rocky finch]

I only one i see only effects lateral

[rocky finch]

oh, nm, the block he's on is blocking the rays

[uneven cloud]

Why are you checking the path when spawning?! Checking that it's on the nav mesh (project onto nav mesh) is all you need. Likely though you are probably allowing for a partial path.

[dawn wedge]

I’m trying to create a spawn system like in COD zombies so I need to check which behavior tree to use if the “door” is open or not, but I ended up finding a solution. I simply grabbed the Path points and checked if the first one was at the actual location and that did the trick.
Thank you for the response, but for the sake of learning where would I check for the allow partial path?

[vestal gale]

Any good resources for moving into more intermediate/advanced ai design concepts in Unreal engine? Gone through a few of the official introductory courses like Intro to Ai with Blueprint. They were really good, but things like best practices (like the correct split between Character, controller and Blackboard) are still very blurry to me.

[gritty lava]

Hey guys, I'm having an issue with my State Tree. Here I have an initializedAI state which I want it to go into at the start and then go into root. There is no path from root back to initializedAI. I have a print string task for both states. What I would assume should happen here is when AI is started it will go into initializedAI, print that it's in it then go into root, and constantly print that it's in root.
However it seams to be alternating between the two states, even though again, there is no link from root back to initializedAI

[uneven cloud]

You can just put the behavior in the same tree, you know. In BP there is a checkbox for partial path and in C++ it's part of the parameters.

[uneven cloud]

Not really UE specific, but there's the GDC vault and AI Game Pro. I would stay away from unofficial tutorials as they teach a lot of really bad habits.

Character = the body. So anything that the body needs to know/do goes there.
AI controller = the brain. Anything about decision making goes there (the BT is a component on the controller).
Blackboard = memory. Anything that the BT needs to know.

[nimble crescent]

bit of an annoying UI problem in the state tree editor -- I cannot rename parameters by clicking "Rename" in the context menu. The menu closes without doing anything.

UE 5.3, macOS platform

If I search the context menu for "Rename" and hit enter, it works

[lone wren]

I have a pretty simple behaviorTree with a MoveTo node targeted at the player, the key is set and all but for some reason the enemy character is not moving
I have the AI Controller that I made set as the enemy's AI controller so any idea what might be wrong?

I also call RunBehaviorTree in the AIController's BeginPlay

[unreal kernel]

You're missing a Super::BeginPlay in that function

[lone wren]

oh my god, thank you so much 😂

[hexed ice]

I've made a simple AI that follows the player slowly without using behavioural trees. I need to now get the value of the distance to the player in order to set it to the value of the "Set RTPCValue". What do I need to get this value?

[dense owl]

Get distance to actor

[uneven cloud]

You shouldn't run the BT in begin play. That should happen OnPosses. Frankly, C++ users should avoid using begin play most of the time.

[hexed ice]

Thanks!

I'll see if this works

[lone wren]

why not use beginplay?

[uneven cloud]

For running the BT, you should use OnPosses, because you know at that time it has a pawn and a bunch of things get set up in the super function.

In general Begin Play is non deterministic. C++ has better options such as PreInitializeComponets and PostInitalizeComponents.

[lone wren]

thank you! I've been using BeginPlay since I started but I'll probably start using those instead

[uneven cloud]

You're welcome! This is a really helpful flowchart: https://docs.unrealengine.com/4.26/en-US/ProgrammingAndScripting/ProgrammingWithCPP/UnrealArchitecture/Actors/ActorLifecycle/

[spring inlet]

is there any way to pass informations from one BT Task to another without having the blackboard full of variables for specific scenarios...?

[stone mortar]

Maybe you can use entry categories for the variables in the blackboard?
Also if you are sharing many variables at the same time, you can create a data structure customized to your needs and group many variables into one object.
There is also service tasks (https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/ArtificialIntelligence/BehaviorTrees/BehaviorTreeNodeReference/BehaviorTreeNodeReferenceServices/), which can be used for simplifying some things

Or maybe custom events, I think that you can trigger events in the tasks and pass on the parameters that you need. Depends on how is your project but that may also be an option

[spring inlet]

yea abusing an object reference on the BB which holds a payload is my plan b

hoped for something cleaner

because at this point i could also store the data on the character and fetch it in each task

[stone mortar]

Im not that good at unreal yet, maybe someone else can help you better. I'm new in the channel, I was going to ask for help in something that I think is simple. I was just following this guide (https://docs.unrealengine.com/5.0/en-US/behavior-tree-in-unreal-engine---quick-start-guide/) But instead of using a character I was using a pawn with a floating pawn movement component, but it never moves. I don't know what I may be missing, the pawn only has a mesh, the collision and the movement component, I was planning on just doing a simple enemy drone with BT

[dense owl]

Shouldn’t need to pass variables across tasks if you just have an actor that is stored in one bb key

[dense owl]

Should still work with floating pawn, did you check your navmesh ?

[stone mortar]

Yes there is a nav mesh

[dense owl]

k, start by running the game while you're in the tree view and see if it ever reaches the MoveTo node. you can pause and use the arrows to move back and forth

[stone mortar]

Works for a character I have there. It moves to the MoveTo but immediately finishes it, I then was just checking a simple AI move to in the pawn start, but that didn't work

So is probably something im not setting up right

[dense owl]

use the gameplay debugger (') and visual logger to see what exactly happens @stone mortar

[cloud iron]

Quick Question When I break the ai's line of sight quickly up close, instead of following me for the duration of the re triggerable by delay, my ai just stands still? The re triggerable by delay does work but ONLY if i dont break line of sight suddenly. I'm sure other people have faced this issue, anyone know the fix/reason?

[dense owl]

Pawn sensing was replaced by AI Perception and that's not how delays work.

and it's not "by" delay

it's a retrigerrable delay

this might be best done with BTs and maybe the Cooldown task @cloud iron

[stone mortar]

I was trying this to test, and the AI move to returns fail

[dense owl]

yeah, figures given that it went to that node but immediately finished

put an actual location that's on the navmesh though, 0,0,0 will probably not work

place an actor on your map, making sure it's sitting on top of the navmesh, copy its coordinates and plug those into that AiMoveTo node to see if it works

[stone mortar]

Ok it worked thanks!, it seems at a certain height it stops working, it doesnt need to touch the nav mesh but there is a certain height that the movement fails. Where can I configure that? In the nav mesh or is something of the floating movement component?

[dense owl]

unfortunately, it doesn't work that way, whether you're using a CMC or FPC, your pawn and your destination need to be on the navmesh, it can't just go floating somewhere high above it

the "floating" part has more to do with stuff like being affected by gravity, doesn't mean you can path out into space

there's ways around it but not that simple

[stone mortar]

Ok I was thinking about this wrong then, thanks

[hexed ice]

So my distance to the actor works, but prints biiiig numbers with highest seen like over a thousand.

How would I condense that number into something more easier to handle with a parameter, like from 0-100?

[dense owl]

Clamp/min max nodes , but you shouldn’t be getting such huge numbers, check your code

[hexed ice]

Not sure. Side question- the model I have is just a model asset in a skeletal mesh. How can I get the model to turn with the AI turning?

Clamping the float makes it 100 all the time in the print

[dense owl]

Well depending on your map, the distance could very well be in the thousands. Not sure why you’re trying to condense it

[hexed ice]

For the purpose of a parameter

Rather than the max unit the parameter can go to being 1000 it could just be 0-100

[dense owl]

Parameter for what, a widget?

[hexed ice]

parameter isnt to do with unreal

its wwise

its reading the print fine

all that i need to do now is get wwise to actually set the parameter value based on the distance

[hexed ice]

@dense owl Got the parameter working.

I need the model to rotate to face the player. Would you know what blueprint component I could use to do that?

[dense owl]

Are you using a BT?

[hexed ice]

BT?

[dense owl]

I guess not then. BT = behavioural trees but I just noticed you said you aren’t

Iirc the character movement component has an orient rotation to movement you can check on and there’s a rotation angle that controls the speed at which to rotate

[hexed ice]

Gonna do it by tick. Not so bothered about it being by tick for now as its only to showcase some technical audio parameter shenanigans

Testing what component would be most ideal

[solar flint]

Hey all how can i get my nav mesh bounds volume to be on this plank

Highlighted in blue so they can go up ontop of the containers

[dense owl]

Check the can step up on setting

[solar flint]

Already set to yes

Weird

[dense owl]

Make it wider see if it works

[solar flint]

Yeah no luck

[vestal gale]

Ahh awesome, I'll dive into those, been a while since I've listened to some GDC talks.
Gotcha, I'll keep that layout in mind too, that's super helpful!

[tranquil heart]

It might be too thin. Try making the "ramp" thicker and then build paths again. When generating the NavMesh it might miss the collision when the object is too thin.

[rich pendant]

Does anyone know why receive tick Ai wouldn't be firing in a custom BT task?

Edit: It's because I had LockAILogic ticked on another node. Unticking resolved my issue.

[nimble crescent]

How can I make a custom behavior tree task succeed or fail? I don't see any way to make that happen.

This is for a task that looks for a target. If nothing is found, it should fail.

This might just be the wrong approach, actually..

https://docs.unrealengine.com/4.26/en-US/InteractiveExperiences/ArtificialIntelligence/BehaviorTrees/BehaviorTreeQuickStart/ suggests you would be looking for a target in the AI Controller, rather than having a BT task that does it

[dense owl]

Not necessarily, but I would use AI Perception and EQS with the perceived actors generator and store it in a bb key. This way you can use a decorator to abort when not found, rather than trying to abort inside the task which is not the right way to do this

[nimble crescent]

hmm, I'm not quite grasping what's "wrong" about doing it that way

Tasks are nodes that "do" things, like move an AI, or adjust Blackboard values.

So it seems reasonable enough to have a task that tries to pick a target (and then the BT snaps back to some earlier task that is now valid because we have a target)

I guess tasks are supposed to be actions?

motivation: i'm making a tower defense game, and i'm setting up the AI Controller for a gun turret

the turret should shoot at its target if it has one and it isn't out of range

and it should try to find a target if it doesn't have one

If I were doing this by hand, I'd make a little state machine. Maybe I should be making a State Tree instead.

[solar flint]

safe ill try that

[dense owl]

maybe, test and find the right tool for the job. I guess "wrong way" is maybe not the right wording. You can use Finish Execute with Success ticked off, I think that'll cause it to fail too, just not necessarily ideal. IMO, it's better to look for a target, store it in a bb key, and if nothing is stored, abort with a decorator so your right branch can be your fallback behaviour. I'd recommend watching the 3rd pinned video in full, it gives a pretty good intro to BTs and EQS

[severe solar]

My enemy AI code ain't working, I have a nav mesh, the UE LOG is called but not the MoveToLocation

void AEnemyClass::OnSeePawn(APawn* SeenPawn)
{
    APlayerCharacter* Player = Cast<APlayerCharacter>(SeenPawn);
    if (SeenPawn)
    {
        bCanSeePlayer = true;
        UE_LOG(LogTemp, Warning, TEXT("Player seen"));

        AController* EnemyController = GetController();
        if (EnemyController)
        {
            // Get Seen pawn Location
            FVector PawnLocation = SeenPawn->GetActorLocation();

            // Set destination to infront of player
            FVector TargetLocation = PawnLocation + (SeenPawn->GetActorForwardVector() * 200.f);

            // Move to TargetLocation
            AAIController* AIController = Cast<AAIController>(Controller);
            if (AIController)
            {
                UE_LOG(LogTemp, Warning, TEXT("Moving")); // This calls
                AIController->MoveToLocation(TargetLocation); // This doesn't move
            }
        }
    }
}```

[dense owl]

It doesn't move or it doesn't get called?

[severe solar]

doesnt move

[dense owl]

I'd start by manually giving it a location that you know for sure is on the mesh, not above it, etc. . If that doesn't work, use the gameplay debugger (') and visual logger to find out why.

[severe solar]

yeah doesnt work

how do I use gameplay debugger

I also get this in output log does this affect anything
LogCharacterMovement: Error: Character Movement Component owned by BP_WolfEnemy_C_1 must update a component owned by a Character

[dense owl]

you press '

but that error makes it seem like there's something wrong with your CMC

[severe solar]

that brings up some console command thing

[dense owl]

no, you're using the wrong key

it's not `

[severe solar]

OH

[dense owl]

'/" button

[severe solar]

yeah I don't see anything that stands out here

[dense owl]

My cpp skills are not as great, but it seems to me that you're calling AIMoveTo on the AiCon not the actual char?

[severe solar]

yeah

i could try use the actual char

nvm that doesnt work with navmesh

[spring inlet]

does someone know if 5.3 supports moving smart objects?

[rich pendant]

Im using the run dynamic behavior node, is there a way to have the node start from a specific point within the BT? There might be moments where the BT will be interupted but when the AI goes back to it, i would like them to go back to where they were.

[rich pendant]

I'm not sure myself but I have recently come across them. Have you used them? What are they like? I'm not sure if I should switch over to them or continue making my own system.

[spring inlet]

they are a pita 😄

i only use them to not have another selfmade solution which does the same as the engine

the idea of smart objects is that you can have hundreds of them without much performance impact, but speaking of 5.2 you cant even move them

i think epic used them for crowd interactions in the city sample, too

[rich pendant]

mine can in theory be moved lol It seems like sticking to my own system might be better for now.

[hollow furnace]

how to expose variable from AI black board,BT , Task to edit in level editor change radius of patrol etc

[dense owl]

Break it into subtrees

[severe solar]

after looking online all day, I needed a Floating Pawn Movement component

[nimble crescent]

on the topic of smart objects:

If the Smart Object's state changes it will automatically release all Claimed or Occupied Slots and will notify the corresponding Agents through the OnSlotInvalidatedDelegate callback.

what, exactly, is the smart object's "state"?

i don't see the term "state" showing up anywhere meaningful in the docs or the C++ API reference

[gritty lava]

My AIMoveTo irregularly fails. Can anyone please help? At certain positions it just does nothing. When I move it might or might not work again and then fail again randomly.

[dense owl]

I figured you had a CMC already

[dense owl]

Use gameplay debugger and visual logger to troubleshoot

[severe solar]

I did but that didnt work on it

[dense owl]

Then you did something wrong.

The AI MoveTo node works with both

[severe solar]

For a start, the only way I could add it was hard coding it in C++, no options for blueprint

[dense owl]

Your pawn needs to be a character to add it (it actually comes with it)

[proud bronze]

anyone know how to make an ai using blueprints and custom events hear with sensing. this is what I have for hearing but it does not work

[patent charm]

anyone know what I'm doing wrong the print string isn't showing up when the ai sees me even though I can see the sight icon

[dense owl]

Wrong system. Use AI Perception, hearing sense

[dense owl]

Is your cast failing?

[hallow abyss]

Is there a simple way to pause my AI? Or to get an animation to override the AI

[proud bronze]

k thx

[proud bronze]

also how do i use it?

[dense owl]

https://docs.unrealengine.com/5.0/en-US/ai-perception-in-unreal-engine/

[proud bronze]

thx

[ivory lantern]

Pause the animation
Get the mesh and set the Boolean pause animation to true

[proud bronze]

I still don't understand, I read through it but I don't understand it

[dense owl]

Watch 3rd pinned link video AI Perception time stamp

[proud bronze]

k

[spring inlet]

is there any logger which can tell me which task aborted a specific part of the BT?

[delicate halo]

Hi what should i use to link data between tasks with statetrees ? I tried with an output and input variable, doesn't seem to work

[patent charm]

I dont know why it wasn't working last night when I was trying for hours, but when I turned on UE5 today it just started working now... But thanks anyways

[dense owl]

Probably the Visual Logger

[spring inlet]

uhm i cant figure out, it aborts my subtree, even tho i use force success decorators

is there like a branch or time limit on subtrees?

nvm

[dense owl]

Not afaik.

[spring inlet]

i found my issue

[dense owl]

What was it

[spring inlet]

some other code running this...

so this did restart the whole BT

[dense owl]

Hehe

[spring inlet]

this probably took me like 2 or 3 hours to figure out -_-

[dense owl]

The small issues often tend to take that long lol

[spring inlet]

yea specially if you are not super familiar with the systems... like i havent done much with BT yet, and wasn't sure how it actually behaves

that's the stuff that i learn from... 😄

now i wonder if theres something which can pause the BT instead of stopping/restarting it...

ah there is... just not exposed to BP...

[dense owl]

Yeah, I hear about 75% of the AI system is not exposed to BP, which is scary 😀

[misty gale]

I feel like we're many in this boat 😅

[spring inlet]

idk why they didnt expose pause tho... it seems like an useful feature

and from what i can tell it works as expected, it resumes where it left off

[misty gale]

Sounds a bit weird i'll admit. theres quite a few examples of stuff not exposed to bp that would be very useful 🫣

[celest python]

75% of that 75% is dumpster fire, which is even more scary

[spring inlet]

well i could imagine that the BT system is quite old and also quite limited because it is supposed to run even on low level hardware

which is why it's so overoptimized in the first place

[celest python]

latter doesnt matter

[spring inlet]

e.g. having non instanced nodes

which seems to be moved more towards mass now!?

[celest python]

problem comes from workaround culture and AIModule specifically is too alien to other modules, and probably they implemented it way too early on engine's development stage

AI team seems to be doing everything on their own

including UX and slate stuff

i think they dont/didnt have much QA either

[vestal gale]

I think I must be missing something here, I'm trying to setup functionality when the AIPerception component forgets a target, but the event is never called!
I set the max age to 5, and in the gameplay debugger I can see the perception target spheres disappearing after the 5 seconds, but the event never fires.

I'm purely working in blueprint at the moment, is this something that needs to be setup in C++ or something?

[dense owl]

Which event are you using?

[vestal gale]

On Target Perception Forgotten

[dense owl]

Is it still in range?

[vestal gale]

No, its outside of the lose sight radius at that point

[dense owl]

Where did you find that node?

I don’t think it’s in the standalone events listed on the perception component so maybe it needs to be bound ?

[vestal gale]

It's a built in event with AIPerception. It's description says it's called when a given target is forgotten

[dense owl]

I mean how did you access it

Right click and typed or how did you implement

[vestal gale]

Ahh would this be the troublemaker?

[vestal gale]

Just added it here?

[dense owl]

Does the on target perception updated fire?

[vestal gale]

Yep, that one works fine

[dense owl]

K well I guess the part you underlined might be what’s missing then

[vestal gale]

Looks like the bool isn't accessible via bp either, that's a shame

[dense owl]

Yeah, but you can get around it if you want

Use the target perception updated node, break the stimuli,
Compare the age with the expiration age

That should get you what you want, I think

[vestal gale]

Gotcha, and plug that into a timer by event?

I think that should work as long as I'm overriding it, cheers

[bitter wyvern]

Hey, wanting to procedurally spawn in enemy ai. Is there a way to assign navmesh during runtime? or does it make more sense to do object pooling and somehow deactivate and activate enemies? (coming from unity so unsure how to deactive an actor so to speak, hideing has not been working)

[dense owl]

What do you mean by assigning a a navmesh

You can procedurally spawn in an enemy easily, just get a transform and spawn actor from class

[bitter wyvern]

My problem is when I spawn an enemy at runtime he doesn’t follow the player

[dense owl]

Are you making sure it’s possessed by the AICon?

[harsh storm]

Common issue is that the setting for controller possession is set to placed in level, instead of both placed and spawned.

The setting is in your pawn

[dense owl]

@bitter wyvern ⬆️

[bitter wyvern]

I’ll check these solutions out when I get back to my computer thanks guys I’ll lyk how it goes

[toxic solar]

so hey i followed mat aspland ai chasing with music video to create an ai but the problem is most of the time my pawn dont sense my ai even if i stand in front of hin here is my code https://blueprintue.com/blueprint/s53udl-0/ i check several time out of 10 time only 1 time he recognize me can anybody suggest me anything i check pawn sensing setting also they are correct

[warm flicker]

Should you use "AIMoveTo" or "MoveToLocationorActor"? I searched that the latter is the newer one and should be used, but I don't have an AIController. I'm trying to make an AI NPC move around using state trees. That being said, does state trees need an AI controller?

[warm flicker]

Getting AI to work with state trees is impossible. It doesn't even want to work. I can't find any tutorials on youtube about state trees AND AI. All the AI content is with behaviour trees.

Edit: I forgot to make my radii variables instance editable. Now it works that I gave them values in the state tree

[rich pendant]

State Trees are still experimental which is probally why there isn't much information on them yet. They do look interesting though. Have you used behavior trees? If so what are State Trees like in comparasion?

[warm flicker]

I'm new to unreal engine and still learning, so I don't know. But my initial impressions is that state trees are more cleaner to work with, than the behaviour trees I've seen used in tutorials

[rich pendant]

I'm still early in AI development for one of my personal projects (current on their 3rd iteration haha) so I might have a look into state trees.

[warm flicker]

Not sure what the difference is with this version using MoveToLocationorActor. It works just as fine (I forgot to add the link from the event node when I took the screenshot). Whats so good about using "UsePathfinding" when the more simple one "AIMoveTo" also uses the navmesh?

[rich pendant]

I believe the move to location or actor gives you the on success and on failure exec pins so you can do something when its finished or failed. The other is probably more fire and forget.

[warm flicker]

They both have on sucess and on fail pins, but with different names. I had to used 2 FinishTask nodes for both of them

[rich pendant]

o yea. I must be thinking of the simple move to. Not sure which would be better to use then.

[silent hamlet]

Idk if you are still struggling with this but this is a project setting boolean.

dont remember exactly where you can find it but look for it in the search bar

[vestal gale]

Ahhh thank you, I should have thought to check haha🤦‍♂️

That's good, my version is pretty hacked together

[rare stump]

Hello i need help i want to make this enemy which is like a ghost so it moves true walls currently it flys toward players but doesnt want to fly through walls it just goes around the wall

[wary ivy]

is it a character?

they use the navmesh for navigation and navigation meshes aren't generated through walls unless you prevent the wall from affecting navigation

[rare stump]

Yes

[rich pendant]

This can be tricky. If all your enemies are ghosts and should path through walls, set your walls to not affect the nav mesh and make them not block the ghost.

If you have a mix of ghosts and non ghosts, you'll probably need to fake it. Have them walk straight to the target and if they hit a wall set their location to the other side of the wall

[rare stump]

i have only 1

[rich pendant]

yea, you'll need to fake it then. I don't believe there's any built in solution for this type of behavior.

[gritty lava]

Why do you use navigation mesh with ghosts?

can't you just move them to location without pathing since they can go through walls?

[rare stump]

so simple to move location player get world location

[gritty lava]

You can use move component to

or Splines

I wanna understand how I can make a state complete before moving on to another state

In this state tree I have Wants To Jump To Wall which takes 3 seconds to complete. I don't want it to move on to Continuously Attack state until Wants to Jump To Wall has completed. Any suggestions?

[rare stump]

ok i got it how i wanted it thx ps dont ask why is peter there

[silent hamlet]

each state tree task has a return value which can be "Running", "Succeeded", "Failed", etc.. You decide in the task when to complete it by returning the related enum value

[gritty lava]

I understand. My issue is that Continuously Attack state gets triggered before Wants To Jump To Wall has finished running. I don't know how to stop that from happening.

[rich pendant]

Im still learning state trees myself but couldn't you add an enter condition to the continuously attack?

[gritty lava]

I could but it would be kinda hacky. I am wondering whether there's a clean way to force a state to finish before another state gets executed

[rich pendant]

I'm not sure, i wish the documentation had more examples. Is there anyway to debug State Trees? like see where it's at?

With regards to state trees, is it possible to switch to different state trees at runtime?

[silent hamlet]

you could add a transition to Next State (Continuously Attack) on complete

[gritty lava]

It transitions to Continuously Attack when the previous state has not finished yet. That's my problem.

[silent hamlet]

they are part of the same parent state so they will execute together unless you put a specific condition to execute Continuously Attack when the Jump Wall is completed. But you dont have that condition in your image

[lone wren]

How do I pass in a reference for the second parameter in GetActorsPerception?

that's the error at the red squiggle

[rich pendant]

Does anyone know if you can run a state tree within a state tree?

[rocky finch]

Why does the AI perception detect all pawns even if they don't have a stimuli source?

[spring inlet]

can someone enlighten me when to use decorators instead of tasks for things like this?

the task does not much but grab an location in the world and write it to the BB, which is then used in the other task

so a decorator could do the same i guess

but i'm not sure when to favor one over the other!?

[uneven cloud]

You can use nav areas and filters to achieve this.

[rare stump]

i already got it working

[uneven cloud]

It's set up to auto see all pawns. You can turn that off in the ini

[uneven cloud]

A decorator should not be used for that. A task or a service (if it needs to be updated) should be.

[spring inlet]

its a one shot operation, so no updates necessary until the whole thing gets executed again

[rocky finch]

The ini option doesn't seem to work 😦

[rich pendant]

Can anyone think of a reason to not use State Trees to run Behavior Trees? Esentially using the ST to manage the main states and then using the BT to perform the actual behavior.

[dense owl]

It does. Follow the documentation OR the setup in the 3rd pinned link

You can also filter results using tests if using the EQS

[dense owl]

I may be misunderstanding your question but you would use the task to store the info in the bb key and the decorator to check if that key has been set or not

[spring inlet]

hmm, why would i not use a decorator in the first place then?

to set the location in the BB, and eventually continue to execute SetLookAtWorldLocation

then i could get rid of the sequence and put all decorators on the actual task?!

[dense owl]

Which decorator would you be using?

[spring inlet]

i would make a decorator out of GetRandomLocationToLookAt (which updates the BB)

[dense owl]

I haven’t tried that but I’d take Luthage’s word for it if she says it’s a bad idea

[unique fern]

if I wanted to add "aim and fire" functionality to the MoveTo task, would I have to subclass the MoveTo task, or can i do this by chaining together tasks in the BT? I'm trying to make a pawn move, aim at a target and fire without stopping

[uneven cloud]

Because they both are brain components and it's not supported to have 2.

[uneven cloud]

You can use a simple parallel.

[unique fern]

Ah! thank you very much, didn't know this existed 🙂

[rich pendant]

Yea your probably right and it might result in weird behavior. I think I'm going to have to stick to BTs instead of ST. Thanks.

When using the 'Run Behavior' to run another BT inside the a BT. Is it possible to have it stay on the 'Run Behavior' node until some condition is met? At the moment, when the BT being run gets to the end, it leaves the node.

[rocky finch]

bAutoRegisterAllPawnsAsSources=false ``` In DefaultGame.ini correct?

[dense owl]

Should be in DefaultGame-<username>.ini

[rocky finch]

ah, ok ty

[dense owl]

What are you aiming for, why do you want to keep it in that tree

[rich pendant]

It's for a task the NPC has picked up. I probably need to change how it's given so if it's interrupted, the NPC can go back to the task.

[dense owl]

You could maybe stop logic and run just that tree

But yeah maybe better to adjust

[rich pendant]

I did think of that but I'm not sure it would be ideal. I might have thought of a solution though. As the NPC actions are their own uobjects, I can keep track of where the NPC got to in that and just use a decorator to only allow the specific BT to get to where it was if interrupted.

[rich pendant]

I have to say, creating custom task and decorate bases can speed up making tasks.

[dense owl]

How so

[rich pendant]

I found myself getting a value from the blackboard each time (and having to cast) so doing this in a task on execute and store in a var. I then create children of that task and I get access to the var without having to repeat myself. 😄

[dense owl]

waiting for Luthage to come out and throw something 😀

[rich pendant]

Shhh, it works. 😛 They can't take this one away from me haha

Do BB condition not work with bools? I've added the decorator and regardless of what the boo is (true or false) it never goes down lets the flow through. Just gets stuck on the wait.

[dense owl]

That decorator checks if the key is set not if it’s True or False

Basically the equivalent of an isValid node

[rich pendant]

Thanks lol

[uneven cloud]

*She. Just because it "works" doesn't mean it's a good idea (it's not).

[uneven cloud]

It leaving the node is how the BT works. If you want it to rerun the subtree, the next run of the tree should get back to it unless it's set up wrong or something has changed. If you want it to wait, then put a wait and add an observer to back out of the subtree.

It sounds a lot like you are trying to force your tree into scripted behavior. I recommend sitting down and understanding how the BT works.

[rich pendant]

Your right. What I wanted is to be able to leave the BT and then when I return to it, have the AI pickup from where they were.

Also why is using a child BT task not a good idea? If the task have common behavior it makes sense to me to make a parent the task can inherit from.

[silent hamlet]

interesting, I recently was experimenting with BrainComponent->PauseLogic() (only exposed to C++) but it didnt seem to work

although I think you should technically be able to simply stop the logic and then restart it. The tree is running based on a shared state (the blackboard) so you should be able to resume it while leaving the state unchanged

...which means, it should pick up where it left

but again, you need to ensure nothing changes the BB state in the time while it is paused

[woven bobcat]

in want to ask, anyone here have made ai task with gas?my custom task always have the recurring tasks on ending the task by checking if the ability activated is ending..one of the way im doing it right now by event dispatcher in bp and i calling it in task by calling that delegate and if the ability reach endability, then it will end the task

im trying to move that functionality with c++ but im not really familiar with ai framework with c++,anyone can give me an example or i should look at a particualr function so i know where to start?

also is there like ai conpedium ?

[uneven cloud]

Because you can put anything into a BB key. Having a parent where you share such minor behavior is a waste of the cost of having more inheritance.

[rich pendant]

Thank you for the explanation. 🙂

[uneven cloud]

It's not really clear what you are trying to do. Why are you using an event dispatcher?

[ocean plover]

Small question about the perception system for Blueprints:

Is there any function exposed to BP to change the Senses Range, MaxAge and stuff? Or do i need to write my own ones (in C++)?

[uneven cloud]

There is not and you don't have access to changing them, so you can't write your own.

[ocean plover]

That would be really bad...
So.. There is no wwy to change the senses range of a base actor (and then its children) based on GAS Stats or Equipped Stuff... Uuuh.. Bad..

[unique fern]

I don't suppose there's any way to "paint" a navmesh is there?

I've got a landscape with specific areas I want to be navigable and others not, I could add blocking volumes all over but is there an easier way?

[harsh storm]

There is not a way to paint one, no.

Glassbeaver ended up making a custom tool to pretty much do that though.

[ocean plover]

You could apply a navmesh modifier to a foliage actor and paint that across the landscape.. Dunno what the performance would be in a great scale.. But worked on my side for smaller areas very well

[uneven cloud]

Not in BP. There is in C++.

[ocean plover]

That's what i asked for..
Do you know a doc i can consult for?

[uneven cloud]

No. You just look for the functions on the perception component. Once you change anything, you need to update Listener.

[unborn sphinx]

When using a behaviour tree for multiplayer bots, and wanting to execute a gameplay ability that persist during a keypress (run ability while shift is pressed)... how might that be accomplished? I see in Lyra that messages are being sent with the input tag. How can I keep that tag active on the bot until a specified time, then reliably remove it?

[ocean plover]

Switch a bool to true and false and gate the ability with it.. While on open you call the ability and on close you cancel/end it

This does the trick for my archer enemies.. And a bow and arrows is not that far from a Gun..

[unborn sphinx]

So in the ability itself, have a switch for if AI or not?

yeah, in the ability I have a "if released end ability" but I could say if NOT ai and released, end ability.... and then maybe have a cancelrun ability that I can run on the AI to cancel the run?

[ocean plover]

I'm using one and the same ability for PC and NPC.

No switch who casted it. Just asking if the projectile source actor is of an enemy.. Or player.. And either the one or the other, ghe damage is charged.

For the PC, the Ability is activated via the Started Execution if the enhanced input action for the special ability (ranged weapons).
And on Cancelled or stopped, the Ability got send an End-Tag to fi ish its Gameplay Task.

Important - The Input Action is of Triggering type "Hold".

The Task itself startes the Aiming and charging of a shot.
The finishing of the ability spawns an arrow, gives it the source actor type and fires via the projectile Component.

For an NPC, the Started Acgion is a simple task in the Behavior Tree, that checks for the TargetActor isSet.. And if the range to it is within the Weapon Range of the ControlledPawn Range attribute + weapon Range add.

So.. The ability got activated on that tasks Execution.. Delays for X seconds (to have the charhing going) and then fire the End-Tag.

In your case i would say.. Acgivate ability on sight and end-tag fire when losing the TargetActor or the Clip gets empty...

I use this exact same setup for all abilities of PC and NPC.. And it currently works for swors/knife and ranged weapons / casting spells..

That's where the runtime change of Sense Ranges gets interesting.. If i place an anemy on a tower.. I want the sight sense to gain extra range, based on the height of the tower (simple Actor's Z position).. And don't hardcode that ranve values..

[unborn sphinx]

Well I am modifying the existing Lyra BT. It currently generally works well as intended, but the only ability they are executing is a weapon_fire task that can be fired off once and is fine.

I now want to add an ability to run. The player can use this ability: hold shift, and now u can run, let go of shift and u stop running. This is done in the ability (see attached img).

How can I get the AI to activate this ability for a duration of time when it should be running, then end ability when it stops.

this is how lyra is telling the bots to fire. I assume that if I do this to start the inputtag it will only last for a brief split second then disappear?

as in the character would not continue to run, but would only run for one short burst?

I suppose I should just try it

[unborn sphinx]

I think I will for now just have a separate set of _AI specific gameplay abilities so I can say to trigger the AI ability to start running then trigger a separate ability to stop running which just cancels that other ability.

[rich pendant]

Is there a way to use EQS to get actors that contain components with a specific collision channel that reachable?

[dense owl]

Check the tests you can add, may need to make your own tho

[rich pendant]

I've made an EQSContext to get the list of applicable actors in a range, but not sure how to then filter them out to whats reachable.

[dense owl]

I found this but it seems a bit hacky: https://forums.unrealengine.com/t/check-if-actor-is-reachable/342469

[rich pendant]

That was my first thought but I don't think it would be the best way to check multiple targets. Hence why i was thinking EQS.

[dense owl]

No, there’s prly a much better way, might have to go cpp route, but see what Luthage or others think

[hushed lodge]

Im curious, in games you guys make is it normal to have multiple behavior trees, so for harvester units, enemy units, etc? I always assumed I would have multiple BT's for different "types' of units... I just read on a comment (that I'm having trouble finding now) that you only want one, which sounds bad?

[rich pendant]

Finally figured it out. I needed to create a new generator for the EQS.

[dense owl]

Nice

[dense owl]

Perfectly normal to have subtrees

[unborn sphinx]

Can a decorator be combined with another decorator with OR boolean logic? if either is true the node can proceed?

My intent is to gate a node for a specific purpose but then also randomly allow it for the lol

[soft idol]

Hey AI folks, I want to have my player character walk themselves to a given location. I also want to not use an AIController, because I need the character to be posessed by my usual PlayerController so that the player can interrupt the automatic movement whenever they want by moving the control stick. I used to do this by adding a UPathFollowingComponent to my character and doing the same sort of thing that SimpleMoveTo does, but as of 5.2 I can no longer access a lot of the things I need in UPathFollowingComponent.

This seems like a simple thing to do, and yet I am struggling with it. Specifically I want to know when the navigation movement has finished or been cancelled. Before, I'd do this by binding to UPathFollowingComponent::OnRequestFinished but as of 5.2 I cannot access FAIRequestId that is required by the signature for OnRequestFinish

This all used to work before we updated to 5.2, and now even with engine modifications to re-export FAIRequestId, I get a crash when the delegate tries to broadcast

There seems to be a lot of things for "observing" AI behavior but all of it requires the AIController

[dense owl]

You can have something controlled by both

[soft idol]

oh for real? How does that work?

my character can be possessed by more than one controller at a time?

[dense owl]

Not exactly, but you can possess with the AICon and still control with the PC

And if not you can not prly hot swap

[soft idol]

yeah I figured that would probably work but it seems annoying to have to deal with...

[dense owl]

In an RTS project I use AIMoveTo to move the unit and input from the PC to make it do other things at the same time

[soft idol]

how is the PC attached to it?

[dense owl]

Afaik, It’s basically a “god” controller, it will always have access to it

It doesn’t need to possess it to affect it

[soft idol]

I don't think I understand

like you lose the reference to the character

unless you manually keep a reference to it

[dense owl]

Idk what you mean

Why would you lose the reference

[soft idol]

like the possessed pawn of the controller, the Pawn variable in AController

if the PC unpossesses the pawn so the AIController can possess it, then the PC no longer controls the pawn unless you keep a second reference to it

[swift breach]

Can I use multiple blackboard based conditions in one node for selector to check?

[ivory rune]

Sure, you can. But it might be better for you to make your own decorator to make the graph easier to read.

[woven bobcat]

so when ability is end, it will call finish execute.. if not the task will end before ability end..there a delegate in abilitysystemcomponent called onabilityended..its similiar to what my event dispatcher does but i want that functionality in c++

[pallid mica]

Does anyone know a good way of accessing the Edges of the NavMesh based on the current location of an Actor/Entity?

I'm currently doing something like this:

const ARecastNavMesh* RecastMesh = Cast<ARecastNavMesh>(NavMeshSubsystem->GetMainNavData());
const NavNodeRef NavNode = RecastMesh->FindNearestPoly(TransformFragment.GetTransform().GetLocation(), FVector(20.f));

TArray<FVector> Verts;
RecastMesh->GetPolyVerts(NavNode, Verts);

FVector PolyCenter;
RecastMesh->GetPolyCenter(NavNode, PolyCenter);

TArray<FNavigationPortalEdge> Edges;
RecastMesh->GetPolyEdges(NavNode, Edges);

But the PolyEdges aren't necessarily NavEdges.

[uneven cloud]

In the task that you start the ability, you bind to the on ability ended delegate. You don't need another event dispatcher.

[dapper crest]

Hi guys, I've added some custom rotation logic to my character. I'm not using SetFocus on AIController anymore, my rotation rate is set to 0 and "Use controller desired rotation" and "Orient Rotation To Movement" on the CharacterMovementComponent are set to false. Any idea what might still cause incredibly fast rotations/teleport rotations now?

[dense owl]

https://forums.unrealengine.com/t/charactermovement-rotationrate-does-not-change-speed-of-rotation/281749/6

[dapper crest]

Yea but I want it to do nothing. I have custom rotation logic now.

[dense owl]

Then the issue is probably in your custom rotation. We would need to see your code, can’t really guess at it

[dapper crest]

It's super simple. The interp speed is clamped between 0.001-10 (0 wouldd be instant).

For clarity's sake. It's working most of the time. But sometimes the character does sudden flips.

And I'd like to know what causes that

[dense owl]

I would right click and watch the value coming into interp speed at runtime, it sounds like you might be getting spikes of small values and idk what’s in that pure function you have

[dapper crest]

Hm no. Even if I just put a hard-coded value in there it happens

[dense owl]

Then it could be an angle issue, I’ve seen people have problems when the angle rolls over 180/360, causing it to flip over to the back. Can’t explain this well but I would watch the interp rotation target input, may need a normalize axis or a clamp

[dapper crest]

Hmm I would expect the rotation direction to be an issue in those cases, that it might flicker or something. But not suddenly teleport 180. It also happens in small angles.

But yea I'll have a look at it

[unborn sphinx]

is a custom blueprint decorator the easiest and an appropriate way to randomly enter a node/subtree? Or is there some native random chance decorator?

[lunar grove]

ai montages not working ?

[dense owl]

Not that way anyway, don’t put delays in a task

[lunar grove]

i'm trying from long time to just play ai montage.

can help me out

No, Answer on Forum, Reddit, this channel too.
related to my issue.
there question everwher but no right answer

[harsh storm]

Nothing special about an "ai montage" from a regular montage

For all we know your montage isn't in the right group. Or your ABP isn't set up correctly

Or the zombie skeleton isn't compatible with that montage

[lunar grove]

upper body slot is setup and skeleton is compatieble

[harsh storm]

You're playing a montage and then immediately overriding that one as well with another montage.

[lunar grove]

let check with player once

doesn't matter it should atleast glitch

it does nothing

[harsh storm]

This is an #animation issue, not AI. Unless the AI isn't being possessed.

[harsh storm]

Prove it. Show that everything is setup correctly in all of the places that are supposed to be

(I do apologize if this comes off a bit rude, that is not my intention)

[lunar grove]

you don't to apologz ?
i will apologz after testing 🙂

its working for player but not npc

[harsh storm]

This doesn't show anything about the AI.

The issue is the AI character not doing the montage.

[lunar grove]

ok, i will send Ai video too

[harsh storm]

Show the ABP as well

[lunar grove]

Apologz @harsh storm it was as you expected.
but zombies working no upper body of player is not working lol

[lunar grove]

quck question: how can make switch to active run BT on Below root noode to run or not run below using boolean.
try using variable char into task but it doesn't turn off BTree.

[dense owl]

Are you looking for a Decorator?

[lunar grove]

yes

[hollow furnace]

I'm curious about solution

[dense owl]

I'm curious about what the question actually was, I thought I answered it but then again I was confused by what that meant to begin with

[unborn sphinx]

am I wrong for liking bt? why do ppl crave other things?

[dense owl]

Right tool for the right job

[unborn sphinx]

if I use a MoveTo node to go to an actor-base-classed key, but the actor in the key is not valid, is that an error or is it handled gracefully automatically?

[dense owl]

If the key isn’t set, it’ll just not move and fail silently

It allows you to use decorators to set fallback behaviours

[unborn sphinx]

what if the key is set, but that actor was destroyed since it was set?

[dense owl]

It’ll become unset.

[unborn sphinx]

Ohhhh

oh oh oh nice

[dense owl]

But you’ll prly get errors somewhere else

[unborn sphinx]

oh not nice

[dense owl]

Unless you catch them with isValids

[unborn sphinx]

yeah so I had that in one place but I should have it in more

[dense owl]

Basically Unset = nullptr/None

[unborn sphinx]

right so if I do get value as object then try and do something with it thats just like if I did that with a normal object

but so the failed move to node will indeed unset the key?

an unset bool key is the same as false right?

[dense owl]

If you do that, you will get accessed None

[dense owl]

No, the failed move is a consequence of not having a destination, it is not the one setting your key

[dense owl]

Negative. Again, Unset = None/nullptr. Not True or False

Aka invalid

[unborn sphinx]

interesting thank you

wait the bool thing can't be right... I am setting the bool on every actor, base don some metric, and when I check "is (bool) set" ir reacts to true or false

well wait a minute. that doesn't discount what you said. It just means that an is set check will use false as a not set.

either way i am confused ugh

[lunar grove]

apologz for my english I'm just need simple switch on and off AI behavour Tree for AI place in Level

[lunar grove]

example : Constant Pursuit Player /Patrol Disable,

I tried bool switch on/off AIController UpdatePercption and BTRunTree Function to toggle but didn't work

[quaint zodiac]

Hi everyone! Can someone please tell me what is the best way to do AI navigation through doors?

[lunar grove]

Hello, does anyone know whether the AI hearing sense is somehow related with multiplayer?

I have made all the senses for my AI, and they work perfectly in both single player and multiplayer, however the hearing sense doesn't work in multiplayer as I would expect. For some reason the UAISense_Hearing runs the update function client-side, and it's the only side that gets the stimulus, and tries to resolve it. I can't understand why it's the case. To check whether it's client I simply try to get GM, and it's nullptr in this case 😢

EDIT: Apparently the issue is related to the PIE. In standalone game mode (not net mode) it works perfectly, as well as in packaged version.

[gritty lava]

Does anyone know if State Trees run every frame? if they do how are you supposed to do framerate independent random events? If I have a random in my State Tree and my FPS is 120 instead of 60 it gives that random thing twice as likely to happen. I tried multiplying the random change by deltatime but still it doesn't give me the results I want. I'm not sure what formula I need to use to get 20% chance of something happening every second for example

[dapper crest]

Does UBTTask_MoveTo manipulate a character's orientation in any way? I'm using custom rotation logic but it seems like it's snapping to it's move direction rotation sometimes. Even though the character is set up like this. When I disable the BT and only leave on my custom rotation logic, the snapping is gone.

I thought maybe disabling "AllowStrafe" was the cause, but it doesn't seem to be the case

[cold surge]

What would be the best way/best practice to add small animals to an open world game? Like Rabbits, Squirrels, Birds etc.
I have Animal Behaviour Kit Pro for my bigger animals which require more logic, but I'm looking to keep these smaller ones as cheap as possible (performance wise) while still having some interaction with the world.
Any tutorials or tips on this would be greatly appreciated! ❤️

[dapper crest]

Some basic steering behaviors would be enough probably! Wander, seek, flee,...

[cold surge]

Yeah exactly, best to write that myself probably huh? (Don't have any experience with that yet.)
I also want them to be shootable with bow and arrow, but that's rather easy I think. OnHit = Dead.. xD No way a small animal like that is gonna hop/walk around with an arrow in them. 😛

[dense owl]

Watch the 3rd pinned link video, should help you understand BT basics

[dapper crest]

It's not that hard if you understand vector maths

[dapper crest]

@dense owl do you have any more ideas regarding this?

[dense owl]

🤔 try using the Visual Logger to see what exactly happens at runtime.

Did you monitor your rotation angle and everything ?

[dapper crest]

I've done some custom logging on my own rotation logic. And there I could see the interpolated value it was setting was always correct. But sometimes the next frame the starting rotation would've changed drastically.

[dense owl]

From what to what

[dapper crest]

What can the Visual Logger do here? To me it seems like its happening when the character moves. So that it assumes its movement direction as orientation. Even though the Character is set up not to do this.

[dapper crest]

It's not a clamping issue like you suggested yesterday. The values you see here are current rot , target rot, interpolated rot being set

136 -> 77 | 136 (actually goes to 77)
-74 -> 136 | -80 (actually goes to 136)

-0 -> -157 | -0 (actually goes to -47)
-179 -> -3 | -179 (actually goes to -0)```

[dense owl]

It might show if there’s something weird going on with your AI Move

[dapper crest]

Sometimes it rotates towards the target, like in the above 3 instances. But the bottom two don't seem to be related to that.

[dapper crest]

Ok. I've never used it before though

[dense owl]

Show your BT

[dapper crest]

I didn't make it and it's huge, anything in particular you're looking for?

[dense owl]

You said your movement is fine until you turn your BT on. What do you mean, you didn’t make it?

[dapper crest]

Someone else programmed it ages ago

I now added custom rotation logic to the AIController, the character orients itself properly with the BT turned off. But it doesn't do anything else anymore of course.

[dense owl]

Ok well it sounds like you narrowed it down to the BT so if you can’t show it, and you don’t debug it yourself 🤷‍♂️

[dapper crest]

I'm asking what you want to see in it. I can send you a screenshot if you want to see some small lines and nodes lol

I'll move onto learning the Visual Debugger eventually if needed. But I have the feeling that it would just confirm my suspicion that MoveTo is affecting the Character orientation.

So I guess the main reason I'm asking around here is to see if people know something that I don't about which things might affect character orientation

[dense owl]

Whatever has to do with movement and possibly rotation.

Having people take guesses can only take you so far, and ideally you should have access to whoever made it, or make one yourself where you know what’s going on under the hood

[dapper crest]

I know. And I do have access but he doesn't know/remember.

[dense owl]

The fact that the BT is that big is concerning in the first place, unless this is some AA game you’re working on

[dapper crest]

In my experience it's pretty common that a certain bit of state /logic is being overlooked simply because you don't know it exists because of the sheer size of the engine. I don't think it's wrong of me to inquire about that before I start a slow and tedious research task.

Which I was already doing for the record.

[dense owl]

Not wrong but debugging is 50% of game dev

Maybe someone else can offer guesses as to what’s wrong, I’m out of ideas

[dapper crest]

I am debugging and asking for input. Not whether my behavior tree is too big lol. But whatever. I'll carry on thanks.

[dense owl]

Right, you @ me and asked for input, I asked to show code, you say it’s too big too show, now you’re mad about asking

Gl with your queries

[dapper crest]

I'm asking for info about AI and character movement features of Unreal, inside the AI channel. Not to debug my code. I am doing this myself but am at the same time looking to learn more about all the things going on in the engine that we didn't not explicitly write ourselves. If you have no answers to that, that's fine. But I thought maybe someone could list the out of the box elements of character/AI/Behavior Tree stuff that might affect character rotation.

[dense owl]

Check the agent radius

Could be that it’s too “fat”

[dapper crest]

It doesn't look like it's trying to move to you. Render the target location?

[rich pendant]

Does anyone know if there's a way to have an EQS return something other than an actor? specifically components. (I've created a custom generator but want to check it's return type)

[dense owl]

Not afaik, I think it has to be an object. Might have to store that in a bb key and check it inside a task

[dapper crest]

You feed it a target no?

[dense owl]

Looks like your AI move is failing. Use Visual Logger to try narrowing down the reason

It also looks like there’s no fallback behaviour, do you have a right branch with a Wait node or something?

Rn it just looks like it’s failing and spamming the same branch again

[rich pendant]

Im using the EQS to get components that the querier can reach. Using the actor isn't perfect though as some actors could have a specific component more than once.

[dense owl]

Oh, then I’d prly attach tags to those actors and filter that way

Iirc there’s a gameplay tags test, but you’ll need to expose the GameplayTagInterface to bp for it to work properly, mind you that’s not very difficult tbh

[rich pendant]

I don't have an issue gettings the actors the components are in (Sphere trace) but being able to just pass the component itself would make more sense. (and prevent possible issues)

[dense owl]

Idk tho, are you saying you want to test if you can reach a specific component on the actor

[rich pendant]

Ideally, the EQS would return the components (of a specific type) in range that the querier can reach. But it looks like im limited to actors and vectors.

[dense owl]

Yeah, I think so.

It should say something like Aborted, Invalid etc. on the movement’s result

Adding that fallback behaviour (i.e. low priority branch with Wait ) should help clear up the log so it’s not spammed with a move order every second

[rich pendant]

I switched to just returning their locations and picking one at random. I then just do another small sphere trace at one of the locations to get the component after the EQS has finished.

[dense owl]

Nice

Try actually scaling down the character to like half the size for testing?

Yeah that’s odd

[lunar grove]

Does anyone know how to get this Inverse Condition field pop up in the decorator menu? Apparently its a default field which is not displayed by default. I've tried to go through some code of the decorators that have them, but I didn't find anything. 😦

UBTDecorator has it as UPROPERTY with an EditAnywhere, but apparently there's something that hides it 🤔

[dense owl]

Which decorator are you using and by menu are you talking about the details panel?

[uneven cloud]

It sets control rotation. You need to turn off using control rotation on the character, not the movement component.

[uneven cloud]

Yes. Only in C++

[lunar grove]

Gameplay Tag Check. Yeap, I'm talking about the details panel

[rich pendant]

Thanks, I thought that might have been the case as I wasn't able to create a new 'EnvQueryItem'.

[dense owl]

lol nice

[halcyon glen]

Which are best? State tree or behavior tree?

[dense owl]

Usually depends on the use case, right tool for right job and all but I do tend to hear there’s more issues in state tree

[latent sundial]

guys

when i put my AI_character on nav mesh volume

it creates holes in nav mesh

is there any way to fix this

AI agent should not create hole in nav mesh when placed in editor is my goal

[uneven cloud]

Check all components and make sure that Can Affect Navigation is set to false

[latent sundial]

thanks Luthage i got it worked

[vestal gale]

I'm setting up a simple animal AI that runs away from an enemy when it sees one. I'm setting EnemyActor and EnemySeen blackboard vars in the perception updated event to trigger the logic on the BT, but I'm unsure if I should be triggering things like increasing the run speed in the perception event alongside those nodes, or in a BTTask that calls a function on the controller to handle that logic?

Sorry if it's a vague question, just curious about the best spot to trigger the logic.

[full wing]

Guys i have problem, basically when enemy sees me,based on successfully sensed, the actor for the object(player) is set, but i can clearly see that enemy does not see me which should not enable it but it still does, whats wrong?

Like I am not in his field of view but the scripts says i am since the sucessfully sense is true

[dense owl]

Your video was showing a BTT Patrol task running when he’s searching for you

But it happens briefly and he finds you right away. I would maybe look at your perception range and angle (peripheral)

[full wing]

patrol points you mean? its my behavior tree.

i changed the angle and it is still not working 😦

i guess ill just work around it

[dense owl]

You have something called possible location of the player being set, by a service from the looks of it. You’d have to show the rest of the tree to see what exactly is happening at runtime

You can also step through it yourself at runtime by hitting pause and using the arrows

There’s also the visual logger if the above is not enough to figure it out

[dense owl]

⬆️

[full wing]

ill check visual logger

but for now i lost too many brain cells from this

Do it later

thanks 🙂

[proper dagger]

need to have an enemy ai ship that will have the target tower hardcode, fly towards the tower, fire weapons and when within 500 meters, veer off, fly out a bit, then turn/bank and come back and fire again until it is shot down or destroys the tower.
This make more sense as an AI/Behabiour Tree or simply done in the event graph with a handful of branchs and distance calcs?

[upper terrace]

Hello I want to know that my ai character does can it run the ship like I have the logic of how to move ship but I want my ai to control it now so I came to ask that in most gta games ai goes in car and move it around map does that ai controlling car or the car is itself the ai?

[rough sphinx]

Hi, any idea why the AIMoveTo has invalid moveresult and null path?

but this function does the job, why??????

[ivory rune]

Do you have a navigation mesh?

[rough sphinx]

yes that green floor is the navigation mesh

[ivory rune]

Ok, so does your AI character has AI controller?

Well, it seems the collision actually exclude the character from nav mesh

Just try to uncheck Can Ever Affect Navigation ?

[wary ivy]

yea the collision settins seem to be wrong for your pawn there

does the box collide with the world?

[rough sphinx]

The AI can move but
UAITask_MoveTo::AIMoveTo -> this doesn't work
UAIBlueprintHelperLibrary::SimpleMoveToLocation -> this works
so here is my question, why?
even though the AIMoveTo says that the path is invalid as i show in the pic

[rough sphinx]

tried but aimoveto still doesn't work

[ivory rune]

From your error message, still like you didn't find the path

Maybe just assign the actor instead of the location?

Or make the location a bit higher (increasing the Z value)

[rough sphinx]

still invalid, haha no idea

[dense owl]

Nvm I believe I’m thinking of MoveDirectlyToward 😬

From what I can find online, it looks like AIMoveTo requires an AICon but SimpleMoveTo works with any controller

[severe solar]

Following unreal documentation on AI quick start, and my patrol sequence just gets skipped, despite everything in blueprint working

if I move "wait" before the "move to", the wait gets called, and my blueprint is working fine, i tested it by printing the random location in radius

[dense owl]

Which moveTo, you have 2?

[severe solar]

the one under patrol

[dense owl]

So when you’re testing this, HasLineOfSight is Not Set for sure?

[dense owl]

And also, you put your service after the task, so it won’t have a valid location

It’ll always fail

It likely doesn’t get skipped , just moves through and fails too fast for you, you can check by hitting pause and moving back and forth with the arrows

[severe solar]

yeah it goes to patrol for a split second

[dense owl]

Yeah, because of what I said

Your service needs to run before the Move order

Otherwise how could it possibly get a goal location

[severe solar]

how do I make a service run before the task

[dense owl]

You’d move it up to the composite node. But unless you want to keep finding a bunch of locations while it’s trying to move, you’re prly better off using a task instead

Check out the 3rd pinned video

Services are more for things you want to run at certain interval, like using event tick or event by timer

[severe solar]

like this? still doesnt work

[dense owl]

Put it in a task instead, there’s no need to run a service

Your tree will re-evaluate as needed

[severe solar]

hold on a min

[dense owl]

That pinned vid shows all of this iirc

[severe solar]

still has the same issue

[dense owl]

Is your cast succeeding?

[severe solar]

yep

[dense owl]

lol

You haven’t selected your bb key

Look on your random patrol node

You need to select the key (PatrolLocation)

[severe solar]

in the behaviour tree?

[dense owl]

Yeah

On BTT_FindRandomPatrol

Right side panel

[severe solar]

that was the issue

i love unreal engien documentation

thanks

[upper terrace]

Hello can someone help me getting some question answers

About ai

[dense owl]

Don’t ask to ask, just ask 🙂

[unborn sphinx]

What would be the main reason AISense_Damage is not registering on a NPC character? I feel like it is set up correctly. Stimuli source on the pawn, some config on the AIController, an EQS running on the BT... still nada

I am using lyra, which uses invisible meshes for the pawns with cosmetic parts... could that be it?

no that shouldn't be it, because it is health component based and the health component works as expected

[dense owl]

Iirc you have to notify damage

[unborn sphinx]

there is already that built into lyra

i'll show it just a sec

[dense owl]

Not sure then, Lyra is a rabbit hole I’ve seen many get lost in so I haven’t looked into it much

[unborn sphinx]

so far lyra has been rad af so I wanna get this working lmao

the send damage event is not getting sent for some reason

report*

[upper terrace]

How can I make my ai to control a vehicle. Like rotating the wheel of the ship

[dense owl]

Set breakpoints and find out

[upper terrace]

I just want to know how will it move it left and right. Like I use it with my input axis mapping

[unborn sphinx]

am doing so

[upper terrace]

Does ai also have it's inputs?

[unborn sphinx]

finally it wasnt me doing something wrong for once lmao dang lyra

[dense owl]

No, but I’m not sure which tool would be best to use to control the steering by AI

[dense owl]

I told you lol, Lyra will mess you up 😃

[unborn sphinx]

everything will. once you sort it out it's golden lmao

the stock lyra bots are pretty rudimentary they just shoot everything with a pulse on the other team

and the wall too if they see an enemy even if they arent aiming at it

anyway long story short there was no clear way to tell the damage wasnt working because it was so rudimentary

i forgive the devs

[upper terrace]

Sad that's what I wanted to know 🥲

[dense owl]

As far as I can tell you wouldn’t actually make it steer, you would just use vehicle movement component and just give it an ai move order or use spline pathing

But others here might have better input

[upper terrace]

Well vehicle movement component ok but are u saying I make the vehicle ai. Because that's not what I want.

[dense owl]

What do you want then? 😀

[upper terrace]

A ai enter the wheel. Then it rotate left and right according to it's area just this simple thing I want nothing more 🥺

[unborn sphinx]

it is that first cast to playerstate failing. What kind of actor is instigating damage!?

[dense owl]

Could be any actor afaik but again, not sure how they do it in Lyra

[unborn sphinx]

what would be an easy way to find out I am a newb at unreal debugging. I'm used to being able to see all sorts of values in VS debugger

and hairstrands crashed again lmao

maybe it is an ability system component doing the damage??

[next hedge]

Hey guys. Anyone know how to interupt a MoveTo Task? I have one as part of a sequence with a blackboard condition (bool) which is properly being set and unset but MoveTo does not seem to want to be interupted until it has finished its task completely.

[dense owl]

Try stop movement

[next hedge]

I don't see a Stop Movement task or service, unless you mean to make a custom one.

[dense owl]

It’s an actual bp node. Are you trying to abort from inside the BT?