#gameplay-ai | Unreal Source | Page 104

random ridge Jul 14, 2018, 4:28 PM

#

I thought that means I can only path jumping down but not the other direction?

grand atlas Jul 14, 2018, 4:28 PM

#

Ah yeah, you're right. I didn't notice the details panel.

random ridge Jul 14, 2018, 4:30 PM

#

yeah idk man, the path is letting him jump down, but the AI keeps trying to climb up even though the direction is set

grand atlas Jul 14, 2018, 4:31 PM

#

Now when I try it, i see the same issue.

#

No wait, actually. If I in the category "simple link" change it to Right to left, then it works.

random ridge Jul 14, 2018, 4:42 PM

#

ah yeah, I see, Thanks!

#

each point on the link has a direction too which needs to be changed

visual wave Jul 15, 2018, 2:28 PM

#

Where can I learn to make a bit more advanced ai for games? Not super advanced, just more advanced than "move here and do this". Seems like every tutorial I find is for beginners

ocean crystal Jul 15, 2018, 2:29 PM

#

I'd read papers, blogs, books, etc that talk about AI

#

And then apply that using what you know from the basics.

lyric flint Jul 15, 2018, 5:41 PM

#

I'm working on a GOAP planner, but my GOAP actions are objects and I realized I cant do linetraces in them, is there a good way to circumvent that?

#

Using blueprints that is

#

I'm still figuring out GOAP but I think using objects is the best method of approach for the actions

patent hornet Jul 15, 2018, 5:58 PM

#

well, considering you posted this in AI

#

you are using a BT?

#

a Service can do the linetraces / EQS query

#

then just set the BB keys or w/e you need for your tasks/decorators to work

lyric flint Jul 15, 2018, 6:01 PM

#

@patent hornet No I'm using my own system seperate from BT

#

I could try integrating BT into it but that would be quite some work I'd imagine

patent hornet Jul 15, 2018, 6:01 PM

#

you can still run an EQS query

lyric flint Jul 15, 2018, 6:03 PM

#

Mmh yeah I'll try that

#

thanks

patent hornet Jul 15, 2018, 6:03 PM

#

the Linetrace doesn't work by default in UObjects

#

because they don't have a default implementation of GetWorld()

#

i am not sure if implementing that function manually would let you use them from inside the BP tho

lyric flint Jul 15, 2018, 6:09 PM

#

Ah right makes sense, I mean I could just make it snowflakely make requests to the controller to do linetraces

#

But that seems like a bad move

patent hornet Jul 15, 2018, 6:09 PM

#

c++ will let you do that

#

either by using WorldContextObject->GetWorld() or overriding the GetWorld() and using that

#

again, not sure about the BP

lyric flint Jul 15, 2018, 6:13 PM

#

I dont think thats available to BP but atleast I know where to look now

#

thanks for the insights 😄

floral mango Jul 16, 2018, 6:31 AM

#

@visual wave http://www.gameaipro.com/

Game AI Pro

Home of the book Game AI Pro

flint trail Jul 16, 2018, 2:59 PM

#

@patent hornet thanks for that link for EQS video.. A bit confusing, but informative nonetheless.

visual wave Jul 16, 2018, 3:52 PM

#

@floral mango thanks

flint trail Jul 17, 2018, 12:46 AM

#

alright, AI Perception can't be attached to the head easily 😦 Meaning that visually character is looking at me (looking back), yet doesn't see me 😦

#

sucks

#

oh well, back to the primitive Blueprint-coded "cone of view"

#

I guess I can just use AI Perception for hearing instead of vision

worn yarrow Jul 17, 2018, 5:28 PM

#

has anybody manage to get character to recgoznie vehicle for RVO avoidance?

#

they seems to walk straight into vehicle no matter what settings i use

flint trail Jul 17, 2018, 8:25 PM

#

How can I get locations of nav link proxy points ? (so that I can prevent AI from jumping too high or dropping from high cliffs)

boreal moss Jul 18, 2018, 6:02 AM

#

Hey. What u usually use... behavior tree or BP for AI? As far as I have find info, BT, would work better for me, but for some reason there is not a lot of tutorials there

floral mango Jul 18, 2018, 6:02 AM

#

if you're starting out, it's worthwhile learning BTs

swift bolt Jul 18, 2018, 6:05 AM

#

Man having nav mesh issue, AI won't go up the stairs even though I know the character movement settings are good to go up them. Any tips?

#

I've tried tweaking settings for the Nav Mesh in Project Settings as well

swift bolt Jul 18, 2018, 6:21 AM

#

Also stairs are green

boreal moss Jul 18, 2018, 8:11 AM

#

I want to make a Zombie, but there is no actual tutorials out there

floral mango Jul 18, 2018, 8:18 AM

#

well, you need to break down your 'zombie' requirement into smaller features

raven leaf Jul 18, 2018, 3:44 PM

#

Are there any good example projects with AI enemies that act as generic fps bots?

#

Got a few simple problems with my AI and I want to figure out the proper way to handle my functions

flint trail Jul 18, 2018, 4:11 PM

#

there is Ai project on the Marketplace that will do all that for you and more

raven leaf Jul 18, 2018, 4:26 PM

#

@flint trail Which is called?

flint trail Jul 18, 2018, 4:29 PM

#

@raven leaf https://www.unrealengine.com/marketplace/ai-behavior-toolkit

AI Behavior Toolkit by Drix Studios in Blueprints - UE4 Marketplace

Create believable AI characters within minutes using a powerful and flexible Behavior State system.

raven leaf Jul 18, 2018, 4:29 PM

#

Thanks!

#

Ah, I'd rather get a free example project so I can get the basics down and then create my own work - but thanks anyway.

fathom kite Jul 18, 2018, 4:41 PM

#

anyone created behaviour tree tasks in C++?

#

its giving weird link errors

flint trail Jul 18, 2018, 7:48 PM

#

Working on my AI's Attack Task and wondering what would be the best way to kick off attack on specific animation frame ? How to tie in AnimBP machine and BT ?

#

I am thinking maybe putting custom Wait task which finishes execute when Anim Notify fires off on specific anim frame and then Attack Task will run in Sequence to that custom Wait task.

#

Is there a better/proper way of doing this ?

patent hornet Jul 18, 2018, 9:03 PM

#

if you don't mind your BT being stuck in the Task while waiting for Notify

#

you can have the task subscribe to an event that is fired (in)directly from AnimNotify

#

the important thing here is that it doesn't call FinishExecute until the AnimNotify fires

#

with that setup, your BT will be "stuck" on that task until AnimNotify fires, but will react immediately when it does

#

"stuck" because any sequences/selectors will not go any further unless a decorator up the tree aborts the task

flint trail Jul 18, 2018, 9:13 PM

#

I see, thanks

#

out of curiosity, is there another way of doing this or having BT stuck on the task is standard way of doing it ?

#

(I assume it will not be stuck when AI changes state, since I have Selector up the tree and decorators that switch state/branches)

patent hornet Jul 18, 2018, 9:36 PM

#

decorator would abort the entire subtree, yes

#

and task that didn't call FinishExecute isn't done

#

so if it waits for the event to fire, and calls FinishExecute from the event handler after its done with its primary purpose

#

that should work

#

you just can't fall down to next lower priority node until it calls the FinishExecute, that's all

flint trail Jul 18, 2018, 10:20 PM

#

gotcha, thanks

flint trail Jul 19, 2018, 2:58 AM

#

I run into the following issue - when AIs walk in line, RVO works and they don't get "tangled". However, if several (at least 2) AIs get to the same location at the same time, they get "tangled" and rub each other until they break away. As if RVO doesn't even work in this case.

#

Is there a way to check if there is (are) other AIs within certain distance from the target point current AI is heading and if there are, maybe either slow down or switch to another target ?

#

Currently each AI character has an array I fill manually with path_corner actors and they either follow from one to the next or bounce randomly between them. A BT Service picks next path corner and sets it as AI's current target.

#

thanks beforehand

#

I guess I could "flag" path_corner as "occupied" when AI gets to it and then unflag it when AI leaves. This way next AI can check if it's "occupied", switch to another target.

floral mango Jul 19, 2018, 6:57 AM

#

I don't know if there's any kind of position claiming functionality out of the box, doubtful, but worth checking

lyric flint Jul 19, 2018, 1:11 PM

#

does anybody know of a simple way to get "move to / ai move to" to work for wheeled vehicles? or do i have to make it myself from scratch>

flint trail Jul 19, 2018, 2:04 PM

#

@floral mango I was told there is a way to get info if AI is at the end of the path, but I could never find it in Blueprint.

#

I wonder if I can put a service (that checks for the flag on the current target) on the Move To task and a decorator to break Move To in case destination is already occupied

#

The simplest solution would be assigning unique path_corners to each of the AI characters 😉 Then they will never end up heading to the same path_corner.

flint trail Jul 19, 2018, 3:08 PM

#

so, would it break off the task if I have service and decorator on the task ?

flint trail Jul 19, 2018, 4:20 PM

#

@patent hornet ^^ what do you think ?

patent hornet Jul 19, 2018, 7:48 PM

#

you could use acceptable radius, depending on the map layout

#

vary that in custom move task

wise sable Jul 20, 2018, 2:17 AM

#

Although this chat is for behavior tree and EQS am I allowed to ask questions about AI Perception Component here?

flint trail Jul 20, 2018, 2:41 AM

#

@patent hornet do you happen to know if there is something built-in AI specific (in Blueprint) to get proximity to another AI / player or a non-character BP actor ?

wise sable Jul 20, 2018, 2:43 AM

#

@flint trail the AIPerception component can let you set up sstimuli for your aactor if they step into sight range, hit the ai, etc

flint trail Jul 20, 2018, 2:48 AM

#

@wise sable well, since I am not using C++, I can't really use AI Perception because it always "look" forward. Here is the scenario - AI Character is idling and looking around. With AP Perception I can come up to the side of it and it won't see me (unless the FOV is 180 deg, which isn't a good idea). Currently I am using my own "vision" system where FOV follows AI character's head rotations.

#

I will use AI Perception for hearing sense, but I don't want to use it for vision due to the issue described above

#

(in C++ one can "attach" AI Perception to head's eye socket)

flint trail Jul 20, 2018, 3:11 AM

#

currently I'd like to know if AI is near the end of path (it's doing Move To a target actor). How can I do that ? (besides getting vector length on tick)

flint trail Jul 20, 2018, 3:53 AM

#

hmm.. looks like that's the only way - get target actor and see when distance between that and AI will be within certain distance

ocean crystal Jul 20, 2018, 4:09 AM

#

yeah that's probably the only way

patent hornet Jul 20, 2018, 7:33 AM

#

you can get PathPoints from PathRequest

flint trail Jul 20, 2018, 11:08 AM

#

@patent hornet how can I do that? I couldn't find BP nodes for that

patent hornet Jul 20, 2018, 11:10 AM

#

📎 2.jpg

flint trail Jul 20, 2018, 11:38 AM

#

Oh, hehe.. Thanks

lyric flint Jul 20, 2018, 12:32 PM

#

What is EQS about? What are it's main uses?

flint trail Jul 20, 2018, 1:10 PM

#

"The Environment Query System is a feature of the Artificial Intelligence system in Unreal Engine 4 for collecting data on the environment, asking questions of the data through Tests, then returning then one Item that best fits the questions asked."

#

https://docs.unrealengine.com/en-us/Engine/AI/EnvironmentQuerySystem

#

@lyric flint ^^

fresh ridge Jul 20, 2018, 5:51 PM

#

I'm trying to create AI that can dynamically interpret the world(in paper2d) where it needs to know if it is above, below, to the left of, or to the right of an unknown number of platforms, how would I go about creating a dynamic amount of arrays of booleans to store this information?

#

nvm, using structs, obvious answer 😀

sudden drum Jul 21, 2018, 12:25 AM

#

hey guys is it normal that navmeshes are generated under obstacles like rocks?

fluid sequoia Jul 21, 2018, 1:35 AM

#

Yes, the navmesh generator does not have a concept of inside and outside spaces so normally navmesh generates inside obstacles. This isn't a problem using the normal pathfinder as it verifies whether any location is reachable before sending a pawn/character there

stark zealot Jul 21, 2018, 2:08 AM

#

So I've created an AI that uses a behavior tree. At a certain time I destroy the AI and then use "Bind Event to Ondestroyed" to respawn him. He spawns in but he isn't doing anything. It's like his behavior tree, blackboard, and pawn sensing aren't working. Am i supposed to do something else when I respawn him in order to activate those again? Here is my respawn blueprint: https://i.gyazo.com/23c1cc69dac4f888151a912caef8fa24.png

stark zealot Jul 21, 2018, 2:49 AM

#

Ok so i forgot to add the "Spawn Default Controller" note after the spawn AI node. That makes him move around now but his Pawn Sensing is still not working.

stark zealot Jul 21, 2018, 3:13 AM

#

Hmmmm. So my AI is sensing but not working. It says gives error message about "set value as object" being none.

#

https://i.gyazo.com/20cbf73ad040a780a91d12d795414020.png

fervent vortex Jul 21, 2018, 2:18 PM

#

@sudden drum You could use navmesh modifiers or play around with the RecastNavMesh.MinRegionArea (in ProjectSettings/NavigationMesh) value to remove navmesh generation under rocks etc., if you want to. I also know that there is a bool on, I think Static Mesh Actors, that allows you to remove the navmesh that is generated on top of it; but I sadly cannot find it right now. I don't know if this bool effects generation under rocks etc. as well...?

lyric flint Jul 22, 2018, 2:27 AM

#

How good is the FSM plugin for Unreal Engine?

fervent vortex Jul 22, 2018, 2:49 AM

#

@lyric flint I cannot tell you much about that plugin; but, I wanted to let you know about how Epic made 4 live streams which helped me make the state machines that I use for everything. I hope this will help in some way. Below is a link to the first part, the next 3 parts should be easy to find in the YouTube videos to the right, or by searching "UE4 live training state machine".
https://www.youtube.com/watch?v=hr9ybCCPw9Y

YouTube

Unreal Engine

C++ Plugin Based State Machine: Game Code | 01 | Live Training | U...

Announce Post: https://forums.unrealengine.com/showthread.php?121777 Richard and Ian lay the groundwork for plugin-based game code! Game systems written as p...

▶ Play video

lyric flint Jul 22, 2018, 2:59 AM

#

@fervent vortex Thanks for the reply! Another question if I may, what method/system is the best for creating complex AI systems? FSM, C++, blueprints, behaviour trees, EQS, HTN Planner, or a combination of them?

fervent vortex Jul 22, 2018, 3:30 AM

#

I would say a combination of all of them (don't know about FSM) but mainly C++ and Behaviour Trees; with C++ managing which state the character/AI is in e.g. fighting, following, exploring etc. and behaviour trees managing the things the character/AI does in such states e.g. while in the fighting state, the character can evaluate, using data in a blackboard, whether to get into cover, then decide whether to reload, and then decide whether to shoot/attack.
This can be made more complex by adding sub-states e.g. adding roles under the fighting state e.g. Defender, Engager, Advancer; like Naughty Dog does.
Regarding HTN Planners, I used them for a short time; but personally found state machines to work better.

lyric flint Jul 22, 2018, 6:57 AM

#

How do I fix this little problem? 🤔

📎 unknown.png

foggy moth Jul 22, 2018, 12:04 PM

#

@lyric flint - might be a graphical glitch - this is the template map and i know for certain without editing them stairs the AI will be able to path onto them.... set a goal to the top of that platform and see if the AI will make their way to it - they should. if it fails - you know for certain its not a glitch 😃

fickle warren Jul 22, 2018, 12:36 PM

#

https://www.youtube.com/watch?v=xzK4p0V4ODI&feature=youtu.be

YouTube

MrKleeber

Desktop 2018 07 22 15 32 41 03

▶ Play video

#

can some1 explain me why my ai wont register possessed player ?

#

it has been working correctly earlier but for some reason now when i click play it creates new player character and not posses the character already placed in the world

lyric flint Jul 22, 2018, 12:53 PM

#

@foggy moth the airsoft gets stuck on the steps... 🤔

fickle warren Jul 22, 2018, 1:06 PM

#

ok got it fixed.... for some reason it got f*** up when i added another ai in the level. very strange it broke just about everything.

errant wave Jul 22, 2018, 10:07 PM

#

https://puu.sh/B1kqj/f52b653f68.png

I'm trying to make navmesh for a landscape, but I get these strange holes. I thought they were related to slope angles, but changing the max slope in project settings seems to have no effect. Anybody know how to fix this?

patent hornet Jul 22, 2018, 10:11 PM

#

your bounds volume is high enough?

#

deleting the RecastNavmesh from the outliner then slightly moving the Bounds Volume will force it to fully regenerate

errant wave Jul 22, 2018, 10:15 PM

#

I've deleted and re-placed the nav mesh bounds volume, it fully encompasses the playable area, and the holes are still there. It seems like they are related to max slope, but changing the max slope value seems to have no effect...

patent hornet Jul 22, 2018, 10:19 PM

#

it might still be there, just not displayed properly, or just below the terrain

#

(like the 2 screenshots up question)

errant wave Jul 23, 2018, 12:40 AM

#

It seems like it works okay in testing, so maybe it's just a rendering problem

swift bolt Jul 23, 2018, 1:52 PM

#

Hmm so none of the Move To Location, AI Move To or anything seems to be moving my AI. It seems to cause it to rotate but doesn't move. And yes I have a nav mesh. AI move just fails the rest idk what's up with them.

#

It looks like it wants to but doesn't and it's strange because that's the random move to node in my fsm but my chase player move to works.

swift bolt Jul 23, 2018, 3:43 PM

#

https://gyazo.com/b81f3e99119268afcfc752822fbf84bc

Gyazo

▶ Play video

fluid sequoia Jul 23, 2018, 3:48 PM

#

@swift bolt Enable the Gameplay Debugger or Visual Logger and take a look at the AI state if it's failing to path

swift bolt Jul 23, 2018, 5:38 PM

#

Still new to AI in general this is what I'm seeing though https://gyazo.com/0231bf0e65e9d9607c8fc58d612b823f @fluid sequoia

Gyazo

▶ Play video

fluid sequoia Jul 23, 2018, 5:39 PM

#

@swift bolt The pathing isn't failing but the character isn't going anywhere, try taking a look in the Visual Logger and see if there's any relevant error messages

swift bolt Jul 23, 2018, 5:41 PM

#

Yea looks like if I lower the range to get a random point on nav mesh it doesn't fail so starting with that first

fluid sequoia Jul 23, 2018, 5:41 PM

#

@swift bolt Also I notice the Gameplay Debugger is listing the bt value for DesiredPathNode as none, so if that's getting used to set the location the character paths to that might be an issue

swift bolt Jul 23, 2018, 5:41 PM

#

Location for the random walk is get a random point in nav mesh from a radius

#

if radius is too large like > 500 it fails though

#

less than 500 no fail but still doesn't move

#

in all cases it will just turn but not move

#

```LogAINavigation (Log) MoveTo: Location(X=-804.473 Y=-312.309 Z=15.000) Mode(partial path) Filter(None) AcceptanceRadius(5.0)
LogPathFollowing (Log) RequestMove: Path(complete:2) Location(X=-804.473 Y=-312.309 Z=15.000) Mode(partial path) Filter(None) AcceptanceRadius(5.0)
LogPathFollowing (Log) OnPathFinished: Aborted[UserAbort NewRequest]
LogPathFollowing (Log) Updated deceleration segment: 0 (MaxSpeed:0.00, BrakingDistance:100.00
LogPathFollowing (Log) RequestMove: accepted, ID(2726) dist2D(76) distZ(10)

fluid sequoia Jul 23, 2018, 5:44 PM

#

maxspeed 0

swift bolt Jul 23, 2018, 5:44 PM

#

hmmm

fluid sequoia Jul 23, 2018, 5:44 PM

#

uh

#

dunno if that's relevant

#

but if you edited anything in the CMC I'd have a look

swift bolt Jul 23, 2018, 5:44 PM

#

I thought that came from character movement Component

fluid sequoia Jul 23, 2018, 5:45 PM

#

it's probably not even an error. I'm not certain how deceleration segment is even supposed to act in the first place so it might be a completely normal value

#

dunno, might be an issue with the navmesh agent not being large enough

#

although I would think that normally generates an error in visual logger

swift bolt Jul 23, 2018, 5:50 PM

#

@fluid sequoia Thanks for showing me how to debug AI

#

it seems as though it was the speed defaulting to 0

#

on the CMC

fluid sequoia Jul 23, 2018, 5:51 PM

#

@swift bolt Did adjusting the speed value of the CMC resolve the issue?

swift bolt Jul 23, 2018, 5:51 PM

#

Yes by default the speed was 0, I was setting the speed dynamically at certain places I have now made it default not at 0 but something more

#

and it moves 😄

#

Do you know what I should be using to do the move? AI MOve To or AI Move To Location? OR does it not matter?

fluid sequoia Jul 23, 2018, 5:54 PM

#

@swift bolt Glad to hear that fixed the issue. AIMoveTo and AIMoveToLocation are mostly the same, one or the other takes some additional args for acceptance radius or somesuch but if your navigation is working as intended already then you shouldn't need to change the function

swift bolt Jul 23, 2018, 5:55 PM

#

Thanks!

errant wave Jul 23, 2018, 6:48 PM

#

Hey fellas, I have an interesting conundrum, and I've come up with a few potential solutions.

I was wondering if any of you had any recommendations of which solution I should pursue? Or perhaps a solution I am not aware of? I'm still a bit new to UE4's AI and navigation. Thanks!

📎 SquadOverview.png

boreal moss Jul 23, 2018, 7:22 PM

#

How can I replicate AI attack? I can see it with server, but not with a client.
https://gyazo.com/3b8293478e7fed546d20662b9f2d8f39

Gyazo

#

I guess multicast would be bad idea

swift bolt Jul 23, 2018, 8:45 PM

#

Shouldn't there be a way to know if AI reached destination or not? Success/On Moved Finished don't seem to fire

swift bolt Jul 23, 2018, 9:02 PM

#

Or is there a way to convert nav mesh location to world location?

swift bolt Jul 23, 2018, 11:55 PM

#

Can't find info on Project Point To NavMesh https://answers.unrealengine.com/questions/137125/find-the-point-on-navmesh-closest-to-some-fvector.html

patent hornet Jul 23, 2018, 11:59 PM

#

depends how you fire it

#

debugging with VisualLog would be my suggestion

#

Window>Developer>visualLog

#

it will log an entire timeline for all AI controllers and for navigation

swift bolt Jul 24, 2018, 12:55 AM

#

@patent hornet what context was that info in?

patent hornet Jul 24, 2018, 12:58 AM

#

the MoveTo delegates not firing

#

VisualLogger will tell you if the path failed, and why

swift bolt Jul 24, 2018, 12:58 AM

#

we do mean the "On Move Finished" here right? https://gyazo.com/49a60f3f6345b3f33624bda85e1b0292

Gyazo

#

or is there another Move To event that gets called?

patent hornet Jul 24, 2018, 1:01 AM

#

VisualLog will log each pathfinding segment, any cause of path being invalid or blocked, failed or finished

swift bolt Jul 24, 2018, 1:02 AM

#

So your suggesting that it should be firing and working as intended but is failing?

#

Also visual logger isn't printing anything atm? It had for me before don't know what has changed

patent hornet Jul 24, 2018, 1:02 AM

#

my suggestion is you fire it up, record the move being made

#

then examine the logs

#

and you will probably be better informed afterwards

swift bolt Jul 24, 2018, 1:03 AM

#

oh wait nvm

#

workign now

#

ok

#

LogPathFollowing (Verbose) OnSegmentFinished
LogPathFollowing (Log) OnPathFinished: Success[Success]

#

That is all I see

#

after a clear I see this https://gyazo.com/85ee373242a9f10adb7dda663ed2a74a

Gyazo

#

I'm finding this confusing as even while moving it said Status Idle

#

well moving or not nothing changed

#

I could perhaps spawn a trigger box at the known desired location and then check if monster makes it there in a certain amount of time? But I feel like I shouldn't have to do that

patent hornet Jul 24, 2018, 1:08 AM

#

with BT, the MoveTo task should fire a Success when it reaches the goal within acceptable radius

swift bolt Jul 24, 2018, 1:08 AM

#

so I should use MoveTo

#

and not MoveToLocation/Actor

#

although I think both failed to fire

patent hornet Jul 24, 2018, 1:09 AM

#

it should work either way

swift bolt Jul 24, 2018, 1:09 AM

#

I'll try again with MoveTo

patent hornet Jul 24, 2018, 1:09 AM

#

you can watch the BT execute tho

swift bolt Jul 24, 2018, 1:09 AM

#

Doesn't seem to provide extra insight in this context, nor the visual logger

patent hornet Jul 24, 2018, 1:10 AM

#

well, the first block in the controller's timeline definetely doesn't

swift bolt Jul 24, 2018, 1:10 AM

#

So the MonsterAIController_C_O is useless in this context?

patent hornet Jul 24, 2018, 1:10 AM

#

you can click the other blue blocks/stripes

swift bolt Jul 24, 2018, 1:11 AM

#

ohhhhh

patent hornet Jul 24, 2018, 1:11 AM

#

those happen only when something worth logging changed with the controller

swift bolt Jul 24, 2018, 1:11 AM

#

I see

#

so I see ```LogGameplayTasks (Warning) AITask_MoveTo_86> received OnRequestFinished with not matching RequestID!
LogPathFollowing (Verbose) OnSegmentFinished
LogPathFollowing (Log) OnPathFinished: Success[Success]

#

Keyword being "Success" ?

patent hornet Jul 24, 2018, 1:13 AM

#

did you issue MoveTo before the Pawn was valid?

swift bolt Jul 24, 2018, 1:13 AM

#

I ensure pawn is valid before executing any move tos

swift bolt Jul 24, 2018, 1:40 AM

#

IDK I just switched back to Move to and it works :🤷: @patent hornet

cinder agate Jul 24, 2018, 5:12 AM

#

I have my AI working on my ground but when placed on top of a mountain they cant seem to aggro anything. They do however patrol around just fine so I know the nav mesh is working on the mountain. All 'ground' areas are polygon assets and not landscape

cinder agate Jul 24, 2018, 6:18 PM

#

My npc cant be knocked back while chasing a player, anyone know why?

proven sparrow Jul 24, 2018, 8:30 PM

#

When you setup the billboard and then run the behavior tree, it loops on it's own right?

#

Mines stuck, I've got 2 sequences with conditional decorators under a normal sequence and only one task is ran

patent hornet Jul 24, 2018, 8:50 PM

#

tasks are designed to return success or failuire

#

otherwise they will run until aborted

#

call FinishExecute, and choose Success or Failuire via boolean there

proven sparrow Jul 24, 2018, 9:10 PM

#

@patent hornet I do. What about move to nodes? Can I interrupt those somehow? Not that they work...

patent hornet Jul 24, 2018, 9:44 PM

#

you can abort them via decorator

#

question: has anyone here attempted to slap another Brain and Blackboard component to an AIController and tried running 2 BTs side by side?

proven sparrow Jul 24, 2018, 9:57 PM

#

As long as you don't screw with the same controller in a weird manner should be cool?

patent hornet Jul 24, 2018, 9:59 PM

#

i do sense a few opportunities to step on a landmine doing that

#

so hoping if someone already did they are willing to share

#

a single call during BTs execution to AAIController::GetBrainComponent() or AAIController::GetBlackboardComponent() would be enough for the thing to explode in my face

swift bolt Jul 25, 2018, 5:50 PM

#

anyway to check if this is fixed? https://answers.unrealengine.com/questions/230545/aiperception-dominant-sense-has-no-impact.html

#

At the moment once a sound is made and a location is set for the AI to go to, the AI will walk right past me even though it can see me

flint trail Jul 25, 2018, 6:19 PM

#

what is Behavior Subtree and what are the uses for it ?

digital cairn Jul 25, 2018, 6:37 PM

#

Hey, has anybody made the navmesh work in 4.20? I am having issues that my AI does not want to move and as far as I know the navmesh is not getting generated(does not show up green when I select it in Show).

digital cairn Jul 25, 2018, 6:53 PM

#

Figured it out with somebody else:). In case somebody ends up in the same situation as I do, removed the NavigationSystem (or NavigationSystemV1 in my case) and RecastNavMesh sections from the DefaultEngine.ini. And recreated the navmesh, worked like a charm after that.

flint trail Jul 25, 2018, 7:32 PM

#

interesting @digital cairn

digital cairn Jul 25, 2018, 7:32 PM

#

Just wanted to report back and not be one of those "I solved it." 😄

flint trail Jul 25, 2018, 7:33 PM

#

was .ini file in the project's folder ?

digital cairn Jul 25, 2018, 7:42 PM

#

project folder/Config

flint trail Jul 25, 2018, 7:43 PM

#

I see

near jetty Jul 25, 2018, 9:16 PM

#

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

YouTube

victor

Skeleton Movement 3

▶ Play video

#

custom pathfollowing and navigation for the skeletons of DWVR

#

implemented due to how spectacularly bad they were before (using default pathfollow with some tweaks)

#

the skeletons are extremelly low cost in perf, having zero physics whatsoever (other than skeletal mesh being able to hit the raycast bullets). They walk on the navmesh with some trickery

#

i also add some strafing to them (thus the rotating left/right), and a separation system, so they dont collide with each other

#

they can also jump on the map, but that jump is a very simple triangle (2 line segments), ill upgrade it to a curve for nicer looks soon

swift bolt Jul 26, 2018, 7:23 AM

#

What does it mean exactly for a sense to expire never or after a certain amount of time?

rare ruin Jul 26, 2018, 9:36 AM

#

Hello ! Is there a way to set the direction of a aiPerceptionComponent (My actor doesn't rotate but I can rotate his sight).

#

And I don't found how to debug the sight. I have enabled Gameplay Debuguer plugin but it still desn't work.
Thanks in advance for your help 😉

patent hornet Jul 26, 2018, 9:42 AM

#

@rare ruin you'll find this informative https://docs.unrealengine.com/en-us/Videos//PLZlv_N0_O1ga0aV9jVqJgog0VWz1cLL5f/NZZtMNdJk5o

rare ruin Jul 26, 2018, 9:47 AM

#

Thanks 😃

#

And I've found for the gameplay debuguer 😉 "Just tap the ' key "

tidal egret Jul 26, 2018, 2:10 PM

#

Hey, I've done some simple NPC "ai" where characters use a navmesh to walk to certain spots in the game. However, for a new project I'm trying to do something more advanced in a different setting, where I have roads and sidewalks in a city. Is there a good way to make sure characters try to always walk on the sidewalk, but will be able to choose walking on the road when needed (i.e. if a player parks their car blocking the sidewalk, go over the road to walk around it)? How would you do it, are there any tutorials for this sort of thing? Most of what I could find only uses a simple navmesh to move from point a-b, which wouldn't keep roads in account...

foggy moth Jul 26, 2018, 2:49 PM

#

@tidal egret - https://wiki.unrealengine.com/AI_Custom_Pathing,_How_To_Use_Nav_Modifiers_Query_Filters

AI Custom Pathing, How To Use Nav Modifiers Query Filters

crisp oar Jul 26, 2018, 5:28 PM

#

bump

lone jacinth Jul 27, 2018, 12:38 AM

#

Hey can anyone help ?

swift bolt Jul 27, 2018, 2:34 AM

#

@lone jacinth what is your problem, I'm still new to AI in Unreal but maybe I can help

swift bolt Jul 27, 2018, 3:25 AM

#

I need AI advise. I feel like what I'm trying to do should have a common practice yet I feel like I'm doing it in a silly way.

I'm telling the AI to move to sound and sight locations as they update but in order to reset the sight and sound location I'm setting the stored location to some farfetched vector location like 999999 for X,Y and Z. I check to see if the location is that value to know if we should attempt to move to it or not. There has to be a better way?

patent hornet Jul 27, 2018, 6:47 AM

#

@swift bolt if you have recent sensory input move to vector

#

you can just grab the perception component from ExecuteConditionAI in the decorator, and make a check if the leaf below it (move to) should run

#

via the AIController

swift bolt Jul 27, 2018, 2:10 PM

#

@patent hornet my confusion is in the way the AI behaves and the way I think I have my logic setup. I have both sight and sound age set to never expire. I have sight as the dominate sense (whatever that means IDK) and my code is setup such that if the sight Stimulus Successfully Sensed is true the location vector is set from the sights Stimulus Location.

https://gyazo.com/7ef923bda2d25cbf1b0d7622c777f2dc

However what happens instead is, sound stimulus location from the hearing AI stimulus is where the AI goes to even though the location in my code shows its getting set from the sight AIStimulus. Does this mean the array of last sensed stimuli does on come back in the same order?

Also how does it work if they don't expire? Is it just always true no matter what? This little bits make it hard for me to write logic sense I have no idea what unreal is actually doing with all this info it is giving me.

Gyazo

vocal sandal Jul 27, 2018, 5:35 PM

#

Hi all. So Im still very much a beginner with Unreal and am planning to program a basic ai that will shoot people within a certain distance and run to people outside of this distance. I'm planning on learning C++ at some point and was wondering if this would be a good first target for it.

swift bolt Jul 27, 2018, 5:52 PM

#

@vocal sandal Any task that has you motivated to learn is a good task for learning 😄

#

IMO, there is something to be said about biting more than you can chew and exhausting yourself. This task may be a little too much if you have no prior programming experience. It might be better to learn the basics of behavior trees in BP and then redo or move to C++. But anything is possible if you are determined.

lone jacinth Jul 27, 2018, 6:13 PM

#

guys

vocal sandal Jul 27, 2018, 6:13 PM

#

@swift bolt I have a good understanding of C# and some other simpler languages like VB. And I have experience with biting off more than I can chew which is why im asking if this is a good first target goal. How similar is C++ to C# coz if their nothing alike then i will try to make AI with blueprints.

#

@lone jacinth Yes?

lone jacinth Jul 27, 2018, 6:13 PM

#

a while ago someone here sent me like a book for what you need to know to make an online game

vocal sandal Jul 27, 2018, 6:13 PM

#

ok...

swift bolt Jul 27, 2018, 6:13 PM

#

Online doesn't sound like ai ?

lone jacinth Jul 27, 2018, 6:13 PM

#

ah wrong tab XD

#

sryy

vocal sandal Jul 27, 2018, 6:14 PM

#

no prob

swift bolt Jul 27, 2018, 6:14 PM

#

@vocal sandal you are in for surprises going from c# to c++ I'd say

vocal sandal Jul 27, 2018, 6:14 PM

#

@swift bolt ok. Do you have any suggestions for begginer projects in C++

swift bolt Jul 27, 2018, 6:16 PM

#

@vocal sandal well I learned C++ the good old command prompt window way

#

doing very basic tutorials in college

vocal sandal Jul 27, 2018, 6:16 PM

#

ok

#

Im off to Uni soon where ill probably learn it. But i want to get a head start.

swift bolt Jul 27, 2018, 6:17 PM

#

You know the concepts of for loops classes ,etc.. but there is some C++ syntax you'll have to learn and pointers

vocal sandal Jul 27, 2018, 6:17 PM

#

ok

swift bolt Jul 27, 2018, 6:18 PM

#

well there are plenty of online docs to learn C++ I don't know if they offer tasks as well. I think unreal can be a great way to learn C++ but you'll have to get over their C++ macros

#

like UFUCTION(), UPROPERTY(), what flags to use

#

that isn't C++ specific but part of their engine.

vocal sandal Jul 27, 2018, 6:18 PM

#

ok.

swift bolt Jul 27, 2018, 6:20 PM

#

just adds another layer. So you have tackle C++ layer, tackle Unreal Engine Specific Syntax layer, then tackle Behavior Tree API layer.

vocal sandal Jul 27, 2018, 6:21 PM

#

sounds both exciting and complicated

#

@swift bolt Do you have any tips to make a good ai?

#

mostly like how to decide when they should attack and move towards the player without it seeming robotic

swift bolt Jul 27, 2018, 6:26 PM

#

@vocal sandal I'm seeking that information as well

#

I'm new to AI in unreal

#

Most tutorials I've found detail Ai with just one sense, usually sight

#

I can't figure out how to balance between using two senses (sight and hearing) and have sight be the dominate sense. I'm also pretty sure what I do have is not implemented in the best possible way.

#

I posted this in an attempt to clear up some confusion https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/1507604-unreal-ai-behavior-tree-perception-questions

Unreal Engine Forums

I want to implement AI but I'm confused about few things.
Stimulus Sensed: How does this work with the expiration of a stimulus? For example, if age is set

vocal sandal Jul 27, 2018, 6:29 PM

#

i think the best way to separate the 2 is to check if the players is in sight, If not then listen for him. If player not detected go about normal.

#

i learnt a bit of path finding while doing my A-Levels so im hoping that i can use that to create more natural paths for them to follow

swift bolt Jul 27, 2018, 6:30 PM

#

natural?

#

why isn't everywhere the navmesh says is travelable not good enough?

vocal sandal Jul 27, 2018, 6:58 PM

#

well if your making a security guard, giving him a path seems to make sense

#

but using it in combination with the nav mesh will allow you to make him go off course slightly

patent hornet Jul 27, 2018, 7:30 PM

#

@vocal sandal at least the unreal libraries, naming conventions and coding style are much more like c# then c++

#

that said, you will come to miss a few quality of life features

quiet dove Jul 27, 2018, 7:39 PM

#

Quick question, that needs a simple orientation answer: Does the AI Stimulus interacts with shadows and such or do you need in your own services to handle shadows and lights for detection?

patent hornet Jul 27, 2018, 7:42 PM

#

it can only react with actors that have an AIPerceptionStimuli component

quiet dove Jul 27, 2018, 7:46 PM

#

So I would have to implement handling shadows in my services?

#

@vocal sandal , you may be able to implement something like that using the EQS framework. I was fiddling with it yesterday and saw some potentially useful params. (Random weight, etc.)

#

Add some prioritisation for the path, and add some randomness so he veers off path slightly.

vocal sandal Jul 27, 2018, 8:22 PM

#

@quiet dove Ok sounds good. Didn't think of this.

patent hornet Jul 27, 2018, 8:34 PM

#

or make the shadow an attached actor

vocal sandal Jul 27, 2018, 10:31 PM

#

@quiet dove can the AI stimulus react to changes in light? If so you maight be able to use that to make it react to shadows

swift bolt Jul 28, 2018, 12:55 AM

#

If they light has an AIPerceptionStiuliSource registered for sight

#

it would have to be some actor that takes the space of the places the "light" is illuminating.

#

Does this look right? https://gyazo.com/aea30bad8b87ad3afcb0f0ecb1d39c6f

Gyazo

vocal sandal Jul 28, 2018, 1:20 AM

#

tbh i dont know. Test it?

swift bolt Jul 28, 2018, 1:30 AM

#

well the left shows red which means it should have failed yet both look like they are executing at the same time?

#

and it looks like it really is only executing the right

#

so visual bug?

#

Also I find out the source of so many of my troubles

#

I thought Sight was index 0 and hearing index 1 since in my config that is how I have it. Sight is index 0 and hearing index 1. Looks like its actually flipped though when it is reported back from Last Sensed Stimuli

vocal sandal Jul 28, 2018, 1:33 AM

#

I dont know how to help. Literally my first day looking into how the AI stuff works on UE4

swift bolt Jul 28, 2018, 1:34 AM

#

all good

#

I guess to maybe help you out in the future, I'll clear up what I'm talking about if you are interested

#

My AI Perception has this setup https://gyazo.com/936a1a97360e6674010bfcb72ce43e08

Gyazo

#

Yet when pulling it out to get sight and hearing I have to use these indexes https://gyazo.com/9e548d21fdc78c28b077f197ac01caf5

Gyazo

vocal sandal Jul 28, 2018, 1:44 AM

#

So does yellow show that its executing?

swift bolt Jul 28, 2018, 1:45 AM

#

supposed to yes

lyric flint Jul 28, 2018, 3:58 AM

#

Just wondering how this method of AI detection compares to the built-in AI Perception system? 🤔

📎 unknown.png

west cove Jul 28, 2018, 6:30 AM

#

anyone have an idea on how to get a static navmesh working with level-streaming in 4.19-4.20? lots of conflicting info floating around from the past few years

flint trail Jul 28, 2018, 1:46 PM

#

I'd like to know too

#

I assume you can set up individual nav mesh volumes for each streaming piece and connect them with nav link proxies

#

or, disable streaming, build navigation, enable streaming.. Nav mesh should be covering streaming areas. Note that nav mesh has to be in the persistent level

shadow isle Jul 28, 2018, 3:43 PM

#

All, I need a very simple flying AI to follow a path, but work in multiplayer

#

right now I was going the path of a character following a spline, but I'm anticipating issues in multiplayer

#

has some kind soul any pointers on how to proceed?

shadow isle Jul 28, 2018, 6:13 PM

#

i’m thinking to use target points and have the server compute the inputs ontick event, substituting to the original commands as if a user was driving it

#

makes sense or absolute nay?

vocal sandal Jul 28, 2018, 6:14 PM

#

Why would making the path with a spline cause issues in multiplyer

shadow isle Jul 28, 2018, 6:16 PM

#

because replication will cause sudden small adjustments on clients due to lags: following a spline basically means adjusting location and rotation on every tick

#

on the contrary if i can use the character movement component, prediction is already in there

vocal sandal Jul 28, 2018, 6:19 PM

#

ok. So by having the server do all the work it will keep it the same for all the clients. Makes sense

shadow isle Jul 28, 2018, 6:19 PM

#

not really

#

the difference is: using a spline all clients and server have to compute the movement along the spline. things will diverge and when replication adjustments come in, you will see a sudden movement on laggy clients.

#

on the contrary: using the character movement component all lerp to adjust for these lags is already in

#

AFAIK.

vocal sandal Jul 28, 2018, 6:26 PM

#

ok. Kinda makes sense to me now.

patent hornet Jul 28, 2018, 6:32 PM

#

@shadow isle CMC won't replicate stuff to owning client

#

it assumes it knows whats happening from input

shadow isle Jul 28, 2018, 6:32 PM

#

owning client is server

patent hornet Jul 28, 2018, 6:33 PM

#

so, its an AIController?

shadow isle Jul 28, 2018, 6:33 PM

#

yes

patent hornet Jul 28, 2018, 6:33 PM

#

you shouldn't have any problems then

shadow isle Jul 28, 2018, 6:34 PM

#

woth the spline or the cmc route?

patent hornet Jul 28, 2018, 6:34 PM

#

it will work as well as for replicating one client's movement to other clients

#

i tried to fake an input based on pathing information, but a prototype of that (about an hour's worth of effort) was very discouraging

shadow isle Jul 28, 2018, 6:36 PM

#

vblanco told me the same thing damn it

patent hornet Jul 28, 2018, 6:40 PM

#

have you tried just the CMC and replicated movement?

#

because the simulation comes into play when there are 2 conflicting sides: player's input where CMC has to react immediately on local machine in order for the game to feel responsive, and server correcting the owning client's position to the its actual position in the world

#

when its server to client that is not the owner, there is no conflict the way i understand it

shadow isle Jul 28, 2018, 6:52 PM

#

i understand that

#

the conflict comes from the fact that clients compute the same thing as servers but at different times

#

you cannot rely on server broadcasting position

#

otherwise the actor would move by “jumps”

patent hornet Jul 28, 2018, 6:53 PM

#

with AI its not as bad, i mean it certainly won't be any worse then replicating the movement of any AIControlled NPC with vanilla CMC

shadow isle Jul 28, 2018, 7:01 PM

#

i’ll try it out

flint trail Jul 29, 2018, 3:53 AM

#

what's the difference between Ai for SP game and AI for online/split screen coop game? (not the logic, but technical side when working in BP/BT)

patent hornet Jul 29, 2018, 9:06 AM

#

there is none

#

except for needing abit more complex logic then AI chasing GetPlayerCharacter[0]

near jetty Jul 29, 2018, 12:03 PM

#

@flint trail the only real difference is that you need to make your your AI characters replicate properly, and that you have some kind target selection logic

#

GetPlayerPawn ( 0 ) wont work any more, need to grab closest enemy, or aggro

#

keep in mind AII ai code runs on the server

near jetty Jul 29, 2018, 12:30 PM

#

also

#

avoid AI on the Pawn

#

keep it to the controller

#

controllers will be server only, but pawns are clientside, so AI on the Pawn will probably do different things on different players and conflict a lot

flint trail Jul 29, 2018, 12:57 PM

#

I see @near jetty , thanks

steel snow Jul 29, 2018, 6:55 PM

#

Can i get some help. Trying and googling isn't helping. I have a character roaming from point to point and if he sees you some characters start chasing you. Both the character alarm and the chase character are in the maps and are in behavior tree. But i don't know how to activate the chase character when the alarm character sees you.

#

The alarm character has a on see component and it works

patent hornet Jul 29, 2018, 8:01 PM

#

Do the chase ones have AIPerception?

#

Siplest way would be to add AIPerceptionStimuli on observer, add AIPerception Hearing to chase Characters and have the Observer do PawnMakeNoise

#

Sharing a synced Blackboard would also work

#

Or hsving the chase characters have a reference on observer, then fire a delegate in observer to which the chase characteor can react (setting a value in pawn/controller a service can put into their BB, or reacting to the event by calling FinishExecute on some IdleTask, letting the BT proceed)

austere cloud Jul 30, 2018, 10:23 AM

#

Can someone explain EQS and where it's applied mostly? I was able to create AI using Perceptions and BTs successfully without using it so I was wondering about what it is really and its applications.

#

Btw, the gameplay I was planning is a mix of stealth and hack n'slash so is there some sort of EQS application to my AIs?

rare ruin Jul 30, 2018, 11:28 AM

#

Why can't I use AI Perception to handle sight on a player controlled pawn ... ?

#

Or maybe it's an another problem

#

On PIE, all works fine but on build, the perception didn't work at all (for bots and for humans)

#

I just want to use the ai perception component for the player and ai controlled pawns

rare ruin Jul 30, 2018, 11:56 AM

#

Oh so I have enable the gameplay Debugger
And no any perception components are visible

#

Do I need to include something in my build to enable perception ?

#

public SecretProjectName(ReadOnlyTargetRules Target) : base(Target)
    {
    PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
        
        PublicDependencyModuleNames.AddRange(new string[] {
            "Core",
            "CoreUObject",
            "Engine",
            "InputCore",
            "UMG",
            "Networking",
            "AIModule",
            "GameplayTasks",
            "OnlineSubsystemUtils",
            "ProceduralMeshComponent",
        });

        PrivateDependencyModuleNames.AddRange(new string[] {
            "OnlineSubsystem",
            "ProceduralMeshComponent"
        });
    }

#

AIModule is not good enough ?

#

Thanks in advance for your help 😉

#

Oh I've found that :
https://answers.unrealengine.com/questions/382676/ai-perception-component-multiplayer-issues.html

#

So the UPawnSensing component not work for networked client ... Really
I suppose it's the same for AI Perception ...

#

I will just want to reveal or hide players in the client side to don't have lag

wraith eagle Jul 30, 2018, 3:48 PM

#

Does the Nav Mesh generation always overwrite previous Nav Mesh data? Even if there are multiple NavMesh Bounds Volumes in different sub levels?

vocal sandal Jul 30, 2018, 9:52 PM

#

@patent hornet Are you always here or something? Sorry to be off topic but every time I check your active.

patent hornet Jul 30, 2018, 9:58 PM

#

joys of having deadlines 😄

elfin socket Jul 31, 2018, 7:14 AM

#

Do you guys ever have an issue where your Behavior Tree works fine for all AI Characters in PIE, but then when you package the project it turns out that the Behavior Tree only runs for one of the AI Characters whilst everyone else just sits there idle?

UPDATE -- so apparently the issue was that I was packaging for Win32. For whatever reason, if I package for Win64 instead, everything works fine! Go figure.

keen furnace Jul 31, 2018, 12:59 PM

#

@austere cloud if you wanted AI that try and sneak up on a player, or find good vantage points, or basically do anything where the world is taken into account beyond basic perception, thats where EQS can shine

austere cloud Aug 1, 2018, 12:45 AM

#

Got it. Thanks!

flint trail Aug 1, 2018, 3:15 AM

#

how can I see if AI NPC turns left or right when taking off from one target to another ?

#

(currently it does Move To, gets to the target, Waits there for a few sec, and does Move To to another target)

#

@foggy moth ^^ any idea by chance ?

patent hornet Aug 1, 2018, 6:44 AM

#

SetFocus in controlller, use ControllerRotationYaw in PAwn

flint trail Aug 1, 2018, 11:30 AM

#

Aye, thanks

coral pendant Aug 1, 2018, 11:30 AM

#

Hey guys, I have problem, I have create code in the blueprint of map, when overlap trigger spawn AI NPC, but when run with dedicated server (client) the NPC spawn and after few second auto-destroy actor....why? Destroy only for client, in the SERVER the NPC work...can help me? tk

flint trail Aug 2, 2018, 12:53 AM

#

finally got turning on the spot complimented with animation https://www.youtube.com/watch?v=7YarYiZb_gc 😃

YouTube

motorsep

2018 08 01 19 39 15

▶ Play video

grand atlas Aug 2, 2018, 9:28 AM

#

Cool stuff, fun to watch your ai progress. But I got to ask, what method do you use to make the character stop and jump?

flint trail Aug 2, 2018, 1:21 PM

#

@grand atlas thanks. Custom BT task and BP actor with smart nav link component (nav link proxy).

timber flax Aug 2, 2018, 1:39 PM

#

cheers guys

#

this is my first forage into AI, and everything is going pretty smoothly so far

#

i just have one question

#

i have my AI aim at my player and fire

#

however, it aims at the centre of my player, not the section that is currently visible to the AI

#

i have an aiming system set up for this in my animation blueprint

#

but.... idk how to apply it to my ai

patent hornet Aug 2, 2018, 1:41 PM

#

don't aim at the actor, aim at hit location

#

if you're doing a trace first

timber flax Aug 2, 2018, 1:41 PM

#

i'm literally just doing a set default focus

#

which is in the tutorial i followed

#

i'm guessing that's a better way to do it?

patent hornet Aug 2, 2018, 1:41 PM

#

which turns you towards the center of the actors root component

timber flax Aug 2, 2018, 1:42 PM

#

yup

patent hornet Aug 2, 2018, 1:42 PM

#

any adjustments to it do not come out of the box

timber flax Aug 2, 2018, 1:43 PM

#

i get that, i just don't know how to ddo it

willow arch Aug 2, 2018, 1:51 PM

#

havent done much visual detection stuff so i dont know if there's a more performant method, but might it be possible to add some sockets to player mesh which the ai, when close enough, traces against?

#

if the trace is successful(not blocked by e.g. a wall), you know that part of his mesh is visible to the ai and can target it

latent crescent Aug 2, 2018, 3:37 PM

#

who has code for ai that stays still an if a player is in rainge shoot

flint trail Aug 2, 2018, 3:42 PM

#

What's the difference between AI Controller and Detour AI Controller ?

#

(BP class of the controller when setting up one using BP)

latent crescent Aug 2, 2018, 3:43 PM

#

i have no clue

patent hornet Aug 2, 2018, 3:46 PM

#

the other one uses a Subclass of the PathfindingComponent

#

otherwise, none

latent crescent Aug 2, 2018, 3:48 PM

#

ok

flint trail Aug 2, 2018, 4:17 PM

#

@patent hornet so there is no need to use Detour AI controller ? I read somewhere that it has to be used when there are crowds of zombies, for better dynamic obstacles avoidance

patent hornet Aug 2, 2018, 4:41 PM

#

its used to make them avoid each others

#

someone made a demo on this channel a month ago about it

#

you can try a search

#

(it was 20 minute setup and 2 minute demo tho)

flint trail Aug 2, 2018, 5:03 PM

#

@patent hornet this one https://www.youtube.com/watch?v=iYcDyJUByJg ?

YouTube

Gustavo Reis

UE4 Detour Crowd AI Controller Tutorial

This tutorial shows the advantages of using the Detour Crowd AI Controller over the default AIController

▶ Play video

patent hornet Aug 2, 2018, 5:06 PM

#

yes

buoyant geyser Aug 2, 2018, 9:09 PM

#

Does the AI subsystem do any time-slicing / sub-stepping with its ticks, or does it limit maximum tick execution time by default? I've been looking through the AI source but haven't found anything to indicate that it does.

#

(unlike EQS, which does limit max. execution time)

fast cosmos Aug 3, 2018, 12:36 AM

#

Anyone has any experience with DoN 3D navigation?

#

'Cause my pawns suddenly stopped following the player

#

Or, rather sometimes they do, but most of the time they don't

#

And they used to be able to do it perfectly fine back before I fixed the packaging issues lol

#

https://1drv.ms/t/s!AoLVySwm6POpjGN6ggP3WJSW35s1

log.txt

Text Document

#

Now they not only have trouble following the Player, but also crash my game attempting to do so

fast cosmos Aug 3, 2018, 4:08 AM

#

I guess when it comes to DoN's plugin I'm all alone yet again

#

Oh well

#

An issue with my landscape apparently..? 'Cause it's working just fine on a map with just a flat cube.

floral mango Aug 3, 2018, 7:43 AM

#

you can give my 3d nav plugin a go

#

@fast cosmos https://github.com/midgen/uesvon

GitHub

midgen/uesvon

uesvon - Sparse Voxel Octree Navigation Plugin for UnrealEngine

fast cosmos Aug 3, 2018, 8:02 AM

#

Oh cool, I'll definitely give it a shot! Judging by the Readme, it's perfectly usable from a Blueprint project too, yeah?

floral mango Aug 3, 2018, 8:06 AM

#

yeah, just make your AI controller derive from SVONAIController, drop a volume into the level, then you're good.

#

I need to root through the UE ai code a bit more, can probably implement it a little better so it works alongside the regular 2d nav, rather than instead of

#

suggestions welcome

fast cosmos Aug 3, 2018, 8:18 AM

#

Hey, as long as it can chase my player through a landscape, I call it feature-complete 🤣

floral mango Aug 3, 2018, 8:31 AM

#

heh, it should be able to do that fine 😃 Probably needs some path smoothing

#

feel free to add requests/issues on github

hearty rock Aug 3, 2018, 3:11 PM

#

Is there a supported way to use a vector field or similar with the nav mesh? I'm building an "open office" level and want NPCs to mostly stick to a grid type path around the cubes, but allow them to take detours as necessary. I was thinking there might be some way I could paint weights so they gravitate towards the preferred route through the office..?

#

Of course, I'm 90% of the way there just by having a constant high cost region around the cubes, but if there are alternatives I'd like to hear 😄

fathom cypress Aug 3, 2018, 6:04 PM

#

Unfortunately no. Navmesh and navigation in general has been trash for a while now. Hopefully NavigationSystemV2 will be a proper framework with voxel collision representation, spatial partitioning, flowfields, PID controllers etc... so we can get actual natural movement instead of the half-implemented A* we have now

hearty rock Aug 3, 2018, 6:34 PM

#

Is there any information on what v2 will look like?

#

(or is that just a wishlist..)

flint trail Aug 3, 2018, 7:09 PM

#

@fathom cypress when is it coming though? In 4.52 ? 😛

bold sapphire Aug 4, 2018, 12:41 AM

#

So is max 50 ai move to calls at the same time a good number to cap things at for a single player game? I have 50 actors following me with no lag but when I get to around 100 the frame rate drops. Testing this on an android to see how it handles that many ai move to calls.

lyric flint Aug 4, 2018, 1:21 PM

#

Sooooo, I'm having a few problems with my AI's memory system, in that if I jump the AI stops under the generated marker and can't move. Can anyone suggest a new momory system or a way to snap the marker to the ground?

📎 unknown.png

keen furnace Aug 4, 2018, 4:58 PM

#

@lyric flint trace down and put marker there

#

recast doesnt like stuff in the air

wet zodiac Aug 4, 2018, 8:26 PM

#

Hey does anybody had a clue to why set focus and clear focus do not work with root motion?

wet zodiac Aug 4, 2018, 8:50 PM

#

Update: SetFocus works but ClearFocus does not

woeful fulcrum Aug 6, 2018, 8:51 AM

#

Someone knows how to create a scp 173 ai ?

#

just a simple ai

latent crescent Aug 6, 2018, 2:30 PM

#

ok who has ai for a enemy that will lock on a projectile to your character

hearty rock Aug 6, 2018, 2:49 PM

#

If I want to use a behavior tree outside of an AI controller, my only option currently is C++, right?

flint trail Aug 6, 2018, 3:14 PM

#

yea

thin prawn Aug 7, 2018, 11:54 PM

#

is anyone here confidant enough in there ability to take on a mentee??

swift bolt Aug 8, 2018, 3:17 AM

#

so no matter what I do, I can't 'seem to get an actors location reference inside the Behavior Tree Task I made.

#

https://gyazo.com/d7829cd534c6a8e900e221be3e0e90c7 Can't get values here for some reason

Gyazo

#

https://gyazo.com/a43c8946290a4a09512656b6fda3d4d6

Gyazo

#

Can't get values here for some reason

patent hornet Aug 8, 2018, 7:52 AM

#

@swift bolt does your BB have the correct value?

#

did you map the BlackboardKeySelector to the correct key from Task details panel in the BT?

swift bolt Aug 8, 2018, 1:59 PM

#

@patent hornet turns out this issue was related to not referencin the value every tick and so it didn't have to pull the data I was watching. Solved with help from #blueprints

flint trail Aug 8, 2018, 5:54 PM

#

should I have attack BP code (including anim montage playback) in the BT Task or in the Character ?

near jetty Aug 8, 2018, 6:14 PM

#

hey, did your navmesh straight up dissapeared from a level?

#

in 4.20

#

it doesnt seem to rebuild

flint trail Aug 8, 2018, 6:22 PM

#

I am still with 4.19.2

#

I recall seeing something about that

#

something to do with new nav system

#

@near jetty "Navigation-related entries in DefaultEngine.ini and DefaultGame.ini need to be updated manually: from 4.20 release notes

near jetty Aug 8, 2018, 6:31 PM

#

i did update them

flint trail Aug 8, 2018, 6:36 PM

#

I'd just tweet at Mieszko directly, he usually replies

near jetty Aug 8, 2018, 6:38 PM

#

no nav data is being created

#

and thus nothing to build mesh

#

📎 unknown.png

#

seems to be setup here

flint trail Aug 8, 2018, 6:44 PM

#

what a mess 😦

near jetty Aug 8, 2018, 6:45 PM

#

LogUObjectGlobals: Warning: Failed to find object 'Class /Script/Engine.RecastNavMesh'

#

wjat the fuck

#

it cant create a navdata, and as such its unable to build navmesh

#

the fun part is that i actually had it yesterday

#

restarted and it works

#

??????????

flint trail Aug 8, 2018, 8:57 PM

#

so, back to my question.... should I have attack BP code (including anim montage playback) in the BT Task or in the Character ?

#

@patent hornet ^^ what do you think is the better approach ?

patent hornet Aug 8, 2018, 8:59 PM

#

i prefer to encapsulate logic into sensible blocks

#

not knowing your setup, i'd guess BTTask

#

you are likely to change things about it as you go on

#

so you should take the approach which makes it easier to do so

near jetty Aug 8, 2018, 9:11 PM

#

@flint trail in the character

#

but you trigger the attack from a task

#

in my games, i have the attack logic in a component, in fact

#

MeleeCombatComponent

#

holds an array of attack montages and similar

#

and essentially has a "PerformAttack( attack index)" function

#

that i call from a Task

flint trail Aug 8, 2018, 9:28 PM

#

aye folks, thanks for the input

buoyant geyser Aug 8, 2018, 9:32 PM

#

has anyone implemented RTS AI in a UE4 game that shipped?

flint trail Aug 9, 2018, 1:41 AM

#

linking AI to anim graph is a royal pita 😦

#

no wonder people work on PvP games more than on PvE games :/

swift bolt Aug 9, 2018, 2:55 AM

#

just to double check, the AI peripheral degree for sight should be half of the total viewing degree I want it right?

ocean crystal Aug 9, 2018, 2:56 AM

#

Perception or PawnSensing

swift bolt Aug 9, 2018, 3:31 AM

#

AIPerception @ocean crystal

ocean crystal Aug 9, 2018, 3:32 AM

#

its the full angle

#

so if you want the entire front hemisphere you use 180.

#

45 to each side, you'd do 90.

swift bolt Aug 9, 2018, 3:33 AM

#

really?

ocean crystal Aug 9, 2018, 3:33 AM

#

Lemme double check

swift bolt Aug 9, 2018, 3:34 AM

#

says "not the whole range" at the end of its description

#

I naturally assumed what you said as well

ocean crystal Aug 9, 2018, 3:34 AM

#

Right. Normally it says HalfAngle

swift bolt Aug 9, 2018, 3:34 AM

#

so not the whole range means?

ocean crystal Aug 9, 2018, 3:34 AM

#

I guess either of us can twiddle the values

swift bolt Aug 9, 2018, 3:34 AM

#

can we visualize it?

ocean crystal Aug 9, 2018, 3:34 AM

#

plenty of engine comments are wrong.

#

Aye.

swift bolt Aug 9, 2018, 3:35 AM

#

I'm building precomputed visibility right now

#

can't check yet

ocean crystal Aug 9, 2018, 3:35 AM

#

hit apostrophe in game while looking at your AI

#

then numpad 4

swift bolt Aug 9, 2018, 3:35 AM

#

ok

#

oh yea have to have the AI selected ok I knew that

#

maybe this discovery will be worth submitting a comment correction lol

ocean crystal Aug 9, 2018, 3:38 AM

#

Yeah, ok, giving it a value of 45 seems to result in a total of 90 FOV, centered on the forward axis

#

its not quite accurate, though. A few degrees short

#

maybe its the visualizer which is wrong

swift bolt Aug 9, 2018, 3:44 AM

#

indeed

#

just saw it to 57*2 110 almost

#

not sure which is inaccurate

desert fable Aug 9, 2018, 4:46 AM

#

Anyone know what red parts on a nav mesh visual are?

desert fable Aug 9, 2018, 5:12 AM

#

meh i think it means it's being used/regenerated at the same time or frequently.

patent hornet Aug 9, 2018, 5:12 AM

#

nav modifier volume can draw in that color

swift bolt Aug 9, 2018, 5:27 AM

#

hmm so adding a supported agent breaks my AI. I Tried matching the settings with my AI's capsule and tweaking from there but nothing mattered.

#

the behavior tree just goes crazy, flickering

#

But I guess I dont' really need it?

flint trail Aug 9, 2018, 1:21 PM

#

what's the difference between having Use incomplete path (or something like that) checked and unchecked in the MoveTo node ?

flint trail Aug 9, 2018, 2:01 PM

#

also, is there a way to have an array of actors in the blackboard ?

#

(if I want for AI to have multiple enemies)

swift bolt Aug 9, 2018, 2:08 PM

#

@flint trail which move to are you using that has the Use Incomplete path option?

#

the two I see don't have that

#

https://gyazo.com/bec331ed1136a83034b262389252a72d

Gyazo

flint trail Aug 9, 2018, 2:25 PM

#

it's a built-in Task in the Behavior Tree

#

BTTask

#

@swift bolt ^^

#

as for arrays, I am guessing the way to do that would be prioritizing enemies and putting them into array (or better yet a map) in custom BTService, then sorting them by priority and then setting one at a time to be TargetActor in the Blackboard. Sounds about right ?

swift bolt Aug 9, 2018, 2:47 PM

#

@flint trail wish I could help you but I'm still learning too

#

I don't even know which move to to use or what their differences are yet

broken hearth Aug 9, 2018, 4:53 PM

#

Hey guys. I'm currently working on character movement. I'd like to implement a solution to restrict player to move only on navmesh (like it's done in AI pawns movement), instead of just using mesh collisions to determine where the player can move to.
I've read some forum advice that a way to go is to overload some piece of UCharacterMovementComponent, calculate the next movement point from deltaTime and Velocity, project it to navmesh and stop movement if the point is not on the navmesh. I've made it to work, but there is a small issue, the player won't "slide" on the collision with navmesh edge, like it does with just physics collision limited movement.

#

Have any of you stumbled upon similiar problem?

flint trail Aug 9, 2018, 6:34 PM

#

I am making a list (map) of targets in one service, but I need to access them in another service. Should I make BP Actor "AIManager" (or something of that nature) and spawn it on the level when game starts, and have the list there ? (this way any service can access it if necessary). Or should I use BPI for other services to access the list in the service it's going to be created in ?

#

@foggy moth ^^ what do you think ?

flint trail Aug 9, 2018, 7:26 PM

#

@patent hornet ^^ can I even access variables from service to service using BPI ?

patent hornet Aug 9, 2018, 7:31 PM

#

are they part of the same BT, sharing the same BB?

flint trail Aug 9, 2018, 7:32 PM

#

yep

patent hornet Aug 9, 2018, 7:33 PM

#

then just use the BB to share data

flint trail Aug 9, 2018, 7:33 PM

#

can't - there is no way to have a variable type map in the BB

#

map actor/int that is

patent hornet Aug 9, 2018, 7:33 PM

#

but there is a way to have a variable of type object

#

which can hold a map

flint trail Aug 9, 2018, 7:34 PM

#

but I need to store a list of targets

#

oh

#

hmm

#

I'll check, thanks

patent hornet Aug 9, 2018, 7:35 PM

#

might not even be a bad idea to instantiate TargetData UObject from the AIController

#

then just get a reference to is as Object as a BB key

flint trail Aug 9, 2018, 7:36 PM

#

I don't do C++

patent hornet Aug 9, 2018, 7:36 PM

#

so?

#

you make a Blueprint inheriting from Object

flint trail Aug 9, 2018, 7:36 PM

#

not sure what "instantiate TargetData UObject" means in BP 😃

patent hornet Aug 9, 2018, 7:36 PM

#

you put your Map and whatever else you need into it

#

you use ConstructObject node of that class from AIController

#

and store it in a reference

flint trail Aug 9, 2018, 7:37 PM

#

I don't think there is such node..

patent hornet Aug 9, 2018, 7:37 PM

#

instantiate - make instance from a class

flint trail Aug 9, 2018, 7:37 PM

#

I can just make a variable type map in the AIController

patent hornet Aug 9, 2018, 7:37 PM

#

TargetData is the first name for the class that came to mind

#

yeah, but that can also cause clutter

#

this way you put all logic for manipulating Targets in a separate Object

flint trail Aug 9, 2018, 7:39 PM

#

or in the parent class of that AI character

patent hornet Aug 9, 2018, 7:39 PM

#

and live happily everafter

#

ActorComponent on AIController is also fine, if you need it to Tick

#

without c++ you won't get Objects ticking

flint trail Aug 9, 2018, 7:40 PM

#

nah, it will be there to store targets only... BTService will update it

#

I still don't get why I need all that mess if I can simply have an actor/int variable on the controller. With variable I simply get controller from pawn and then get that variable

patent hornet Aug 9, 2018, 7:44 PM

#

if you just need it to hold data, variable is fine

#

with me, it never ends that way

#

sooner or later i'll attach an aggro value to each target

#

then i will get the idea to make it Decay over time

#

for example

#

then Perception events will start influencing aggro directly

#

and before you know it i have 20 functions juggling TargetData

#

and i am happy they are encapsulated in their own Object

flint trail Aug 9, 2018, 7:46 PM

#

I can only imagine 😃 I am just on my first iteration of my first AI 😊

#

so I am trying to keep it really simple for now, until it just works and I learned the basics..

flint trail Aug 9, 2018, 8:05 PM

#

@patent hornet is there a way in BP to see when AI is turning (left or right) so that a bool could be set for anim graph to play turning anims ?

#

Currently I am using custom turning task, but according to this http://www.dreambotstudios.com/ue4-make-ai-rotate-smoothly-avoid-snapping/ there is a way to make AI turn smoothly without any additional code

#

so if I use that trick, I'd need to somehow figure out if AI is turning to be able to play anims

patent hornet Aug 9, 2018, 8:10 PM

#

easiest way? cache the Rotation from last Tick and compare

flint trail Aug 9, 2018, 8:11 PM

#

Get Actor Rotation ?

patent hornet Aug 9, 2018, 8:12 PM

#

yeah, not sure that it will work, but its worth a try

flint trail Aug 9, 2018, 8:13 PM

#

what would be not easiest way ?

patent hornet Aug 9, 2018, 8:13 PM

#

track things affecting rotation

flint trail Aug 9, 2018, 8:14 PM

#

I feel that there is ton of stuff needs to be exposed to BP when it comes to AI and yet we are still in the stone age with it, so to speak 😦

patent hornet Aug 9, 2018, 8:14 PM

#

one can always learn to c++

flint trail Aug 9, 2018, 8:15 PM

#

I could, back when I had a lot of time 😦

swift bolt Aug 10, 2018, 2:18 AM

#

@flint trail well it takes time to do these kinds of things?

#

I basically work 9-6 then come home and work 6 pm to 1 am

#

that is when I'm motivated lol

flint trail Aug 10, 2018, 2:24 AM

#

well, getting old and having family doesn't help me 😃

#

on top of that I do art, animation, textures, level design and game systems design.. It doesn't make sense at all to squeeze in learning C++

wary ivy Aug 13, 2018, 8:50 AM

#

anyone know any good articles that elaborate on how to combine steering behaviours with path finding?

floral mango Aug 13, 2018, 12:10 PM

#

@wary ivy might be useful http://www.gameaipro.com/GameAIPro2/GameAIPro2_Chapter18_Context_Steering_Behavior-Driven_Steering_at_the_Macro_Scale.pdf

flint trail Aug 13, 2018, 1:49 PM

#

interesting https://www.youtube.com/watch?v=RcOdtwioEfI

YouTube

AI and Games

The AI of Doom (2016) | AI and Games

AI and Games is a crowdfunded show and needs your support. You can help fund this series on Paypal, KoFi and Patreon (where you can get access to additional ...

▶ Play video

#

I wonder how it fares against the UE4's AI framework

near jetty Aug 13, 2018, 2:52 PM

#

@flint trail its far better

#

by a huge degree

#

but its of course doom specific

#

nothing says you cant do those techniques in ue4

#

for example they have an equivalent to the EQS

#

they use that to calculate the jump points and similar stuff

flint trail Aug 13, 2018, 2:53 PM

#

ID has all that exposed to their own Blueprints

#

(although it sounds like a lot of that is specific to Doom)

near jetty Aug 13, 2018, 2:54 PM

#

their main cool shit its mostly animation stuff

#

the animation tree of the enemies is super complicated and uses copious amounts of root motion

#

thats what make the things jump well and scale walls and all of that

flint trail Aug 13, 2018, 2:54 PM

#

that' one thing that annoys me with UE4 - getting anims work properly with AI

#

it seems that anim system is tied to player character and is not really flexible when it comes to AI

near jetty Aug 13, 2018, 2:55 PM

#

sadly its just way too game specific and animation specific

#

the anim tree has tools to make everything, but you gotta be smart

#

in theory you can replicate what doom does, but will need manual work

#

replicate it without editing the engine btw

#

could be done in blueprints

flint trail Aug 13, 2018, 2:57 PM

#

I don't - I just want to hook up anims to AI as easily as one can hook anims to player's movement / etc.

near jetty Aug 13, 2018, 2:57 PM

#

but that already works

#

you can use a player anim tree on a bot anim tree

#

and it will work completely fine

#

the thing is that they are different

#

enterely

#

for players you want to ensure responsivenes and unnatural movement

#

but for AI you want to use root motion a lot more

#

the cover system they talk about its 100% EQS

flint trail Aug 13, 2018, 3:04 PM

#

@near jetty what happened to #virtual-reality ? I don't see it on the list of channels :/

near jetty Aug 13, 2018, 3:05 PM

#

its still there

#

you probably have it collapsed

flint trail Aug 13, 2018, 3:05 PM

#

odd

near jetty Aug 13, 2018, 3:05 PM

#

📎 unknown.png

flint trail Aug 13, 2018, 3:05 PM

#

ah, damn Discord UI

near jetty Aug 13, 2018, 3:37 PM

#

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

YouTube

Two Minute Papers

DeepMind Has A Superhuman Level Quake 3 AI Team

Pick up cool perks on our Patreon page: https://www.patreon.com/TwoMinutePapers The paper "Human-level performance in first-person multiplayer games with pop...

▶ Play video

#

capture the flag AIs

elfin socket Aug 13, 2018, 3:39 PM

#

That's a really good idea for a Youtube channel! Pro click

fluid sequoia Aug 13, 2018, 3:41 PM

#

That's nuts

near jetty Aug 13, 2018, 3:41 PM

#

@fluid sequoia they had pro players fight against a pair of bots

#

they lost

#

even over 30 different matches

#

btw the bots are like the Dota2 bots, they are autonomous

#

they dont communicate directly

#

thats why they can play alongside humans

#

you can have human + bot

#

and they seem to work quite well

fluid sequoia Aug 13, 2018, 3:42 PM

#

Now let's see how they handle deathmatch kappa

near jetty Aug 13, 2018, 3:42 PM

#

the same way?

#

thats capture the flag

#

it is already a deathmatch

#

the AIs learned how to camp spawn XD

naive swallow Aug 13, 2018, 9:40 PM

#

hey guys - just a quickie

#

has anyone got any tips on saving Blackboard info using USaveGame?

#

cant seem to put my finger on where the KeyValue is stored

patent hornet Aug 13, 2018, 9:50 PM

#

you can rebuild your BB with first service call

naive swallow Aug 13, 2018, 9:54 PM

#

its more struggling with pulling values out of my existing BB and saving it as something meaningful

#

i've grabbed all of my keys, but thier data is templated, making it hard to make something in my USaveGame that can hold the it

#

if you know what i mean

patent hornet Aug 13, 2018, 9:56 PM

#

still, its based on data you can easily save

#

everything in your BB

flint trail Aug 14, 2018, 4:59 PM

#

Is it possible to have semi-flying AI (like Cacodemon from Doom) without messing with C++ code ? (using BP/BT)

ocean crystal Aug 14, 2018, 6:22 PM

#

If you want actual 3d pathfinding you're going to want to lean on C++. You could theoretically implement a solution in pure BP with no plugins, but practically you're going to be using some extra C++ - be it plugin code, or your own.

#

if you just want simple avoidance that's pretty easy and you can do it with no sweat in BP.

flint trail Aug 14, 2018, 6:59 PM

#

@ocean crystal have you played Doom 2016 ? (or even original Doom 1/2 or Doom 3)

ocean crystal Aug 14, 2018, 6:59 PM

#

A bit

#

I mean, like, that sort of thing is in the latter category.

#

I guess I shouldn't have bothered and just been all ya its easy in BP

flint trail Aug 14, 2018, 7:05 PM

#

Cacodemon would spawn usually at any height mid-air (wherever it was placed by level designer or random spawner) and would begin its descent until it reaches max attack height from where it would begin shooting at player. Let's say player was on the ground and then went into the building and appeared on 3rd floor. Cacodemon wouldn't follow player inside the building (artificially blocked by level designer; otherwise it could) but rather hang outside and when it would spot player on 3rd floor, it could raise up and attack him. Let's say 3rd floor had a busted wall and wasn't blocked by designer. Cacodemon would float into the breached wall and hunt player inside.

#

You can say it's like a hot air balloon

#

not like Descent (game) 6DoF ship

#

how would I control such behavior (changing float height, e.g. distance from the floor) in BP/BT ?

flint trail Aug 14, 2018, 7:31 PM

#

@ocean crystal ^^

ocean crystal Aug 14, 2018, 7:34 PM

#

Sorry, feel like you've got enough of an idea to implement this yourself

flint trail Aug 14, 2018, 7:57 PM

#

🙄

blissful fog Aug 15, 2018, 12:23 AM

#

alex

stray violet Aug 15, 2018, 1:20 AM

#

Hey guys, been working on a procedural dungeon generator, and have it at a place im pretty happy with. However, for AI navigation, whats a good way of generating a nav mesh, since its different every time?

flint trail Aug 15, 2018, 4:08 AM

#

generate nav mesh dynamically using nav invoker component

#

(and don't forget to tweak AI's Project settings)

solar elbow Aug 15, 2018, 7:04 PM

#

https://80.lv/articles/cyber-demons-the-ai-of-doom/
came here after quick look at the article.
is it possible to make a state machine inside of state machine, as they did there? or there should be really a mess inside one single machine?

flint trail Aug 15, 2018, 7:05 PM

#

are you going for inception here ? alex

solar elbow Aug 15, 2018, 7:05 PM

#

you right

patent hornet Aug 15, 2018, 7:05 PM

#

the idea of hierarchical state machines is to limit the number of transitions you need to handle

#

which can get out of hand, fast

solar elbow Aug 15, 2018, 7:06 PM

#

well I know the possible problems and accept them, but it was a matter of techical ability to make such thing, not the logical purpose or reason :)

patent hornet Aug 15, 2018, 7:07 PM

#

yes, its possible

flint trail Aug 15, 2018, 7:07 PM

#

there is FSM plugin on the Marketplace

patent hornet Aug 15, 2018, 7:07 PM

#

needs more design considerations

#

but pays off if you're planning on having many states

#

going from 14->15 states is more work then going from 0->10

#

you could use GameplayTags system for it as well

#

they are also Hierarchical

flint trail Aug 15, 2018, 7:10 PM

#

is there a benefit in using HFSM over BTs when you have that many states?

patent hornet Aug 15, 2018, 7:10 PM

#

i mean, instead of several enums, using stuff like Combat.Firing or Patrol.Searching

near jetty Aug 15, 2018, 8:14 PM

#

@flint trail they are nearly the same thing

#

you can use a BT as a state machine without much issues

flint trail Aug 15, 2018, 8:19 PM

#

how are they nearly the same thing? o.O https://www.gamasutra.com/blogs/JakobRasmussen/20160427/271188/Are_Behavior_Trees_a_Thing_of_the_Past.php

Are Behavior Trees a Thing of the Past?

Introducing the Next Generation of AI: How Utility AIs Are Replacing Behaviour Trees.

#

(the beginning of the article)

#

I wonder what Dishonored 2 and Deus Ex HR/MD use for their AI

near jetty Aug 15, 2018, 9:27 PM

#

LMAO

#

ive implemented that thing

#

several years ago

#

in fact, a more advanced implementation

#

and i did, becouse i saw it in a book from 2009

#

its really not that hard, and you can implement them within behavior trees

#

the basic concept is that instead of branching, you are selecting the "best" action

#

so lets say you have a state machine with states Attack and Flee

#

Attack has a score depending on how weak is the target, and how far you are from it

#

and Flee has more score the less health you have

#

that means that if you are fighting a bot, and YOU flee, the bot will pursue

#

unless the bot is also low on health, in that case the bot might try to flee himself to get health

#

there is one main downside, wich can be an upside

#

they are very, very emergent

#

they are super hard to debug due to the states (or branches) dancing around randomly. But you get a more dynamic AI for it

#

i really liked the bots i made for Heavy Gear Assault wich essentially did this

#

Like everything in AI, they have their uses, or not. I would recomend this kind of AI if you are trying to make a "human" AI, that has more fuzzy intelligence. This type of AI is not what you want when you want an enemy with clear attack patterns

viscid oasis Aug 16, 2018, 2:14 AM

#

That sounds like the result would be slightly more organic.

wintry flint Aug 16, 2018, 3:08 PM

#

So if I read things right, basically use Utility if you want a "living" AI

If you just want an actor doing their part in a play, what we have now works fine

flint trail Aug 16, 2018, 3:46 PM

#

pretty much

near jetty Aug 16, 2018, 4:00 PM

#

yup

#

i thought of implementing a ranking system on top of behavior trees

#

like a "rank selector"

#

wich just runs whatever node has the highest priority

#

and when a node ends or it needs to select a new node, it calculates priority on the subnodes

flint trail Aug 17, 2018, 1:17 PM

#

some AI progress: https://www.youtube.com/watch?v=7m9mVZ5_0z0

YouTube

motorsep

2018 08 16 23 17 11

▶ Play video

lost tiger Aug 17, 2018, 3:14 PM

#

@flint trail it looks very good..

flint trail Aug 17, 2018, 3:14 PM

#

thanks 😃

hearty rock Aug 17, 2018, 3:40 PM

#

Is there a way to easily get rid of movement jitter when using the crowd AI controller?

orchid brook Aug 18, 2018, 1:09 AM

#

I'm looking at setting up some complex AI, and I'm trying to decide between Behavior Trees and Blueprints. I'm leaning towards blueprints because I'm more familiar with them. I can't see any good reason to use BTs. Does anyone have an opinion on this?

lyric flint Aug 18, 2018, 1:43 AM

#

What's the best way to handle having a lot of AI characters spawned at once without effecting the frame rate too badly?

#

by a lot i mean 300-500

flint trail Aug 18, 2018, 2:49 AM

#

@orchid brook you are gonna have to write custom Tasks/Services and maybe even Decorators in BP anyway. The reason to use BTs is that UE4's AI made around that concept. I don't see a reason not to use them at all. Probably even performance would be better than not using them at all.

#

@lyric flint disable collisions and see if that helps. Also, 300 AIs is a lot of AIs. I don't recall any high performance commercial game that uses that many active AI's

lyric flint Aug 18, 2018, 2:51 AM

#

ok thanks

orchid brook Aug 18, 2018, 2:59 AM

#

thanks @flint trail. I guess I'm more familiar with blueprints, and there seem to be a few gotchas with BTs that I will probably discover the hard way

humble marten Aug 18, 2018, 4:22 AM

#

@flint trail BT nodes are great for easily prototyping ideas, but you'll get the most performance out of straight C++ implementations of AI behaviors (by convention, blueprints are slower than C++).

#

Plus, you can always just expose them to the blueprint editor to make them configurable inside the BT system

flint trail Aug 18, 2018, 4:26 AM

#

@humble marten true, but (s)he was asking about BP vs BT, not C++ 😉

humble marten Aug 18, 2018, 4:26 AM

#

@flint trail a good point nonetheless. just throwing it out there

flint trail Aug 18, 2018, 4:26 AM

#

I don't use C++ cuz I don't know it

#

(nor got time to learn it properly)

#

plus BP can be nativized (and I am sure BTs get nativized too)

#

so while indeed one should use C++ for max performance, properly coded 100% BP games (with nativization turned on) perform good enough on modern hardware

humble marten Aug 18, 2018, 4:28 AM

#

acknowledged

flint trail Aug 18, 2018, 4:30 AM

#

meanwhile I need to get SetFocalPoint working without sacrificing smooth rotations 😦

#

doesn't seem to be possible

#

(out of the box)

#

From what I gathered, I need to have bUseControllerRotationYaw true (on Character component) for SetFocalPoint to work.. But, if I do that, character snaps when it needs to turn.

#

any ideas how to reconcile this paradox ?

#

hmm.. figured it out, but it sucks - either SetFocalPoint works, but I need to set it dynamically so that AI looks where it's going or I can keep or keep AI oriented to movement component (which looks good; but then SetFocalPoint doesn't work)

#

decisions ... decisions...

neat summit Aug 18, 2018, 5:25 AM

#

@flint trail Sorry if I'm being naive, I really don't remember, but can't you make rotations smoother reducing turn speed? Not sure if it works on the Focus task though.

#

Now, if you are talking turn in place, you could override the "FaceRotation" method in the pawn and implement your turn in-place logic in there. It works really well with control rotation being applied to the pawn

eternal halo Aug 18, 2018, 8:04 AM

#

Is there anyway to stop the AIcontroller from being destroyed when its pawn is?

#

nvm

#

I think I figured it out

open thunder Aug 18, 2018, 9:54 AM

#

UNavigationSystem::SimpleMoveToLocation is deprecated?

#

For some reason I can't find it

pine steeple Aug 18, 2018, 9:50 PM

#

@lyric flint 300 active ai will be more taxing than 100 normal players. 300 ai at one time is really bad design. Also if your spawning and destroying ai quite a lot you would want a pooling system

tawdry breach Aug 19, 2018, 2:28 PM

#

this is stuck for some reason i cant add the key

📎 Screenshot_43.png

#

i want to make a petrol guard

#

can anyone please help me ?

#

i made the AI controller BP

#

please let me know if you can help DM me

tawdry breach Aug 19, 2018, 2:49 PM

#

@dawn pumice

lyric flint Aug 19, 2018, 5:50 PM

#

Looking for insight on how to treat the blackboard. Is AIControllers and other classes supposed to update BB values, or is it up to the behavior tree to query the game state and update blackboard. Or is it simply just a mix between? Thanks 😃

patent hornet Aug 19, 2018, 6:35 PM

#

@lyric flint https://www.youtube.com/watch?v=49Xub-taTig

YouTube

Mathew Wadstein

WTF Is? AI: Service Nodes in Unreal Engine 4 ( UE4 )

What are the Service Nodes in the Behavior Tree in Unreal Engine 4 Source Files: https://github.com/MWadstein/wtf-hdi-files

▶ Play video

shell dock Aug 21, 2018, 2:10 AM

#

hm i have a small problem... if my ki see the player and move to him and lose vision.. and then see him agian... the old move task get paused... so after some running and stuff... i have many paused ai gameplay task... not sure how to prevent that atm

#

and the next problem is... if i set the world position from my player, sometimes the ai perception get triggerd... like its not a instant teleport

#

the perception looks in a direction where she cant see the player but triggers on set position from player

#

any ideas?^^

shell dock Aug 21, 2018, 2:49 AM

#

ah nvm forgot the stop movement on abort event... now the gameplay task dont stack anymore

viscid oasis Aug 21, 2018, 4:13 AM

#

what's the alternative to a finite state machine? the one with actions instead of a branch list?

viscid oasis Aug 21, 2018, 4:33 AM

#

Ah I'm confusing behaviour tree and FSM

shell dock Aug 21, 2018, 4:40 AM

#

update: its looks like set actor location triggers sometime ai perception... the teleport looks like works fine... (need to do some testing)

buoyant geyser Aug 21, 2018, 12:14 PM

#

I'd just realized that I've never posted my paper / tutorial on real-time dynamic cover systems in the channel that matters! :)
Comes with full source code and all:
https://horugame.com/real-time-dynamic-cover-system-for-unreal-engine-4/

HŌRU

DavidNadaski

HŌRU | Real-Time Dynamic Cover System for Unreal Engine 4

Create a robust cover system in Unreal Engine 4 (UE4) that updates itself at real-time, responds to dynamic changes in the environment, uses multi-threading to parallelize computation and octrees to store data. Works with any kind of game.

ionic geode Aug 21, 2018, 1:54 PM

#

How can I get my BTService made in C++ to tick based on "tick interval" set in graph ? By default it seems to tick every frame with no regards to a set interval.

buoyant geyser Aug 21, 2018, 2:34 PM

#

@ionic geode you're probably not calling Super::TickNode() which is supposed to schedule the next tick in bt services

ionic geode Aug 21, 2018, 2:38 PM

#

@buoyant geyser Thanks!

inner crane Aug 21, 2018, 7:28 PM

#

so i got my animals to attack character but they are really buggy. The fix i assume is to target the closest target than trying to go to each one to attack

flint trail Aug 21, 2018, 8:26 PM

#

show us some video!!!

#

😃

inner crane Aug 22, 2018, 4:42 AM

#

me?

flint trail Aug 22, 2018, 11:05 AM

#

Yep

near jetty Aug 22, 2018, 5:09 PM

#

📎 unknown.png

#

beautiful

#

im using the pathfinding system i created for the RPG game in the shooter game, for the flying enemies

#

so now they have paths to fly to

stark zealot Aug 22, 2018, 7:27 PM

#

Quick question: I'm still fairly new but I made an Ai with his own behavior tree and blackboard. Now I want to make another Ai very similar to the 1st but change some behaviors. Do i have to re-do everything or can I make the 2nd Ai a child of the 1st?

near jetty Aug 22, 2018, 7:29 PM

#

@stark zealot each behavior tree is unique

#

you can use subtrees for some parts that are shared, but in general, every enemy has its own behavior tree

#

the tasks are reused and the pawns probably too

stark zealot Aug 22, 2018, 7:32 PM

#

So I need to make a copy of my behavior tree, name it something else, and edit it for my 2nd Ai?

near jetty Aug 22, 2018, 7:40 PM

#

yes

#

usually you dont have a lot of AIs, and the BTs are fairly easy anyway

#

like, Robo recall has 1 BT per enemy type and enemy AI

#

it does share the tasks and controller/pawn code through typical OOP

#

but the behavior trees are unique

#

i think they do use the same blackboard on multiple enemies

#

becouse if you use the same blackboard you can share logic

stark zealot Aug 22, 2018, 7:42 PM

#

Ah ok thanks. I really appreciate your help clearing that up. I've only been at this a few months so sometimes I feel like I'm doing stuff the hard way lol.

flint trail Aug 22, 2018, 8:00 PM

#

@near jetty every enemy can have one common tree with small subtrees for specific deviations in behavior

viscid oasis Aug 23, 2018, 4:55 AM

#

any advice someone to mimic theme hospital-style AI?

wary ivy Aug 23, 2018, 7:58 AM

#

what makes theme hospital AI the way it is?

near jetty Aug 23, 2018, 9:16 AM

#

damn the new flying AIs i made are a great upgrade to the game

#

i really should have done it before

#

will keep the system for other flying ais in other games

forest drum Aug 23, 2018, 6:58 PM

#

hellos my editor is crashing when right click and making any new arrow in behvaiour tree

#

any solutions for that?

pine steeple Aug 24, 2018, 12:40 AM

#

what version?

stark zealot Aug 24, 2018, 4:06 AM

#

I changed from just dragging my Ai character into my map to a spawner system that spawns Ai when they reach a number less than or equal to 0. My problem is now my Ai's blackboard values won't set such as setting sound location in order to move to that location. I think it has something to do with the Ai Controller but I'm not sure what to do. Here are some pics: https://i.gyazo.com/ddee0be1ab22ca42828b010822c1e20e.png

#

https://i.gyazo.com/1bdc59ac444029d54256c8d36d7c75a6.png

#

https://i.gyazo.com/09cf7b34dbd29a312e57be019cda1787.png

swift bolt Aug 24, 2018, 5:20 AM

#

Having some trouble understanding the refresh rate behind the AIPerception Sight sense. I'm getting the impression (and concern) that the sight sense only updates once and won't update again unless the pawn to sense is moving. I thought if I set the Sight Age to 1, then after expires, if the pawn was still in seeing range it would update again but it doesn't. Is there a way to manually force the pawn to update the sight even if pawn to sense isn't moving? Or am I understanding things incorrectly?

#

I guess I'm looking for the Sensing interval as seen here https://i.imgur.com/tUlr1C1.png but I think that was for the old way to do AI

Imgur

patent hornet Aug 24, 2018, 5:25 AM

#

find a video in Live Steam it has "Advanced AI" in the title

#

also, you can force the perception data to draw in PIE with '

#

video has setting up AIPerception, EQS and debugging AI in it

swift bolt Aug 24, 2018, 5:31 AM

#

seems like my sights age counter isn't moving at all

#

IDK if that means its just constantly resetting on my location every tick?

#

lol the bug he said he fixed for the age counter not going up for sight never got fixed?

#

26:00 min in this video https://www.youtube.com/watch?v=NZZtMNdJk5o

YouTube

UnrealEngine

Setting Up Advanced AI | Live Training | Unreal Engine

Training Content Creator Ian Shadden is joined by Lead AI Programmer Mieszko Zielinksi as they build on the Basics of AI stream and delve into more advanced ...

▶ Play video

swift bolt Aug 24, 2018, 2:59 PM

#

@patent hornet think I found what I needed to call to "Update" it is "RequestStimuliListenerUpdate"

#

Seems to be doing what i want

ionic geode Aug 24, 2018, 3:03 PM

#

Anyone know a way to dynamically override the effect of "Acceptance Radius" in the default MoveTo Task? In an extended C++ class based on BTTask_MoveTo.
I wish to determine acceptance radius based on other parameters that can be changed on runtime.

swift bolt Aug 24, 2018, 3:04 PM

#

No scratch that it doesn't do what I thought it did after digging deeper into the source :/

#

@ionic geode You'll have to dig into source and maybe make your own version of it

ionic geode Aug 24, 2018, 3:08 PM

#

@swift bolt yeah I was thinking to maybe copy the entire class and just change how the radius is set 😃

stark zealot Aug 24, 2018, 7:05 PM

#

Is there a way to make my AI Ragdoll like he's knocked out then wait 30 seconds and return to normal? I have it all working but can't make his ragdolled body return to normal.

leaden flume Aug 24, 2018, 7:08 PM

#

If your issue is the smooth animation to get back up, this is what you're looking for: https://docs.unrealengine.com/en-us/Engine/Animation/PoseSnapshot

stark zealot Aug 24, 2018, 7:13 PM

#

@leaden flume Thanks! That's exactly what I need. I didn't know what it was called

leaden flume Aug 24, 2018, 7:13 PM

#

👍

swift bolt Aug 24, 2018, 7:31 PM

#

There are so many useful function not exposed to the AI Perception Blueprint, are most people cloning it and exposing them themselves or not needing all those juicy functions? Or I guess doing the AI in C++ probably.

near jetty Aug 24, 2018, 7:42 PM

#

the design of DWVR AI is SO BAD that im going to rewrite some enemies instead of fixing them

#

dont do the mistakes i did XD

#

attack logic goes well in components if it needs to change a lot, and a more modular version with a controller that does "nothing" but offer some good functions and then behavior trees doing the stuff

#

i made the huge mistake of having the c++ core class do stuff and share the same controller over wildly different enemies

swift bolt Aug 24, 2018, 7:51 PM

#

Digging through the source it looks like the ProcessStimuli should hit if the flag "bSomeListenersNeedUpdateDueToStimuliAging" is set to true which it should get set to true when the age of a stimuli expires yet for Sight that is not the case.

#

So I guess I need to figure out why sight doesn't age even when an age is set

swift bolt Aug 24, 2018, 8:30 PM

#

So this is interesting. On Perception Updated fires only when a sense is detected not lost.

#

So you can only ever get false back for a sense if another sense fires, so if you register both sight and hearing, and hearing fires the On Perception Updated event, then sight will come in as false. But you can't get sight as false when sight is lost.

#

Is this a good design choice or is there a way to work with this?

#

That fact is forcing me to reset my own IsSeeing bool to false periodically but this isn't reliable because when i set it to false this way it might actually be true. Is there a way to get an accurate bool if the AI is seeing something or not?

swift bolt Aug 25, 2018, 9:57 PM

#

I think the solution is to just use On Perception Target Updated, this seems to be firing more. Need more testing to be sure though.

viscid tiger Aug 26, 2018, 12:53 AM

#

hay all looking for a premade enemy ai for melee enemies

#

can someone point me in the direction of a good one?

viscid oasis Aug 26, 2018, 2:11 AM

#

@near jetty you'd recommend different AI Classes per type of enemy?

near jetty Aug 26, 2018, 8:27 AM

#

yes

#

but its better to use components for the more reusable behaviors

ebon ore Aug 26, 2018, 5:52 PM

#

Hey guys!

Which ways are exist to limit a specific AI to some area, while allow to other AIs to move through all the level?

inner crane Aug 26, 2018, 6:47 PM

#

so im having issues with my ai here is a video showing and explaining issue https://youtu.be/tLj01fLYwe0

YouTube

cai martin

Issues with ai

▶ Play video

pine steeple Aug 26, 2018, 11:52 PM

#

@ebon ore nav mesh modifiers

inner crane Aug 27, 2018, 2:24 AM

#

@flint trail here is that video you asked for

ebon ore Aug 27, 2018, 4:39 AM

#

@pine steeple yes, thank you, I have already found this thing 😃

fallow gull Aug 27, 2018, 8:54 AM

#

Hi guys, how do I prevent an object from generating navigable areas on top of itself?
Like this :

📎 unknown.png

#

Those are dynamic, so a navmesh modifier volume won't help.

wild mortar Aug 27, 2018, 10:05 PM

#

@fallow gull you can make multiple navmesh volume with height lower that can avoid those behavior, and link them up with Navlink proxy

ionic geode Aug 28, 2018, 7:29 AM

#

How to properly get "OwnerComp" from a BTTask in C++ ( Need to call FinishLatentTask from a custom function )

#

Got it..
UBehaviorTreeComponent* OwnerComp = Cast<UBehaviorTreeComponent>(GetOuter());

patent hornet Aug 28, 2018, 7:38 AM

#

or you can get it from AIController reference

#

that you already have, i suspect

#

@fallow gull there is also "CanCharacterStepUpOn" somewhere in collision settings

#

try disabling it

ionic geode Aug 28, 2018, 7:42 AM

#

@patent hornet True, thanks

fallow gull Aug 28, 2018, 9:51 AM

#

@wild mortar ah right! That's a solution.
@patent hornet I don't think it orevents the navmesh from generating areas on top right? I still can project a point on the nav mesh on this area?

fallow gull Aug 28, 2018, 11:37 AM

#

Guys, do you also have issues with the clamp score inthe EQS system?

📎 unknown.png

#

As you can see I have clamped my values to be at a minimum of 0.5 but I still have values under 0.5. Is it a bug? I'm on 4.19

inner crane Aug 28, 2018, 7:34 PM

#

what is a good way to target closest actor with said actor tag

patent hornet Aug 28, 2018, 9:01 PM

#

unless you have a way to limit the actor pool you are querying against, there is no good way

#

FindAllActorsWithTag (i think its a thing) is fairly expensive

inner crane Aug 29, 2018, 4:38 AM

#

i mean i look for actors in a radius so im trying to find closest from the array that i have in the radius with line of site

quaint radish Aug 29, 2018, 7:26 AM

#

The AI programmer for Sims 4 is an instructor at my school. He made some tutorials for me digging into behavior trees. Share and like please to encourage more of this :)
https://youtu.be/GfNXaRY23rY

YouTube

Rez Bot

Unreal Behavior Trees #1

This video goes over the basic theory of behavior trees and how they work. It covers tasks, selectors, and sequences.

▶ Play video

fallow gull Aug 29, 2018, 7:29 AM

#

thank you so much for sharing that, it deserves way more views! I'd never find that without you

brisk coral Aug 29, 2018, 2:06 PM

#

Yes a nice series, very well explained, thanks @quaint radish
Would be good to have pinned to the channel ... sounds like there's a lot more to come.

sterile mirage Aug 29, 2018, 4:15 PM

#

Is there a way to define a NavModifier / NavArea so that they don't allow fallback pathing? I expected NavArea_Obstacle to essentially turn off the navmesh but it just makes the cost super high and still allows pathing if no path exists.

#

Looks like I could maybe get the Path Costs and short-circuit the pathfinding in my behavior trees. Is that a decent approach or am I missing a cleaner / better angle?

sterile mirage Aug 29, 2018, 4:44 PM

#

In case anyone sees the above question and finds this helpful: BlockingVolume with collision settings only blocking the enemy pawns is what I was looking for.

pine steeple Aug 29, 2018, 6:07 PM

#

anyone get weird jittering using crowd following component?

crisp drum Aug 29, 2018, 6:23 PM

#

Hi, quick question, is it better to use many smaller nav mesh bounds volumes or one big nav mesh bound volume and use nav modifiers volumes to exclude the parts that arent needed?

quaint radish Aug 29, 2018, 7:07 PM

#

@brisk coral he's open to requests for topics. Any kind of activity about this would encourage him to keep going. Leave comments and make requests or ask questions. He really is the only person I know who loves explaining things.

flint trail Aug 29, 2018, 7:23 PM

#

I like to explain things too, but I don't know anything about AI 😛

errant wave Aug 29, 2018, 9:27 PM

#

Hello gents! Would any of you know why my navmesh won't generate indoors, even with nav agent radius/height set to be small enough? I can't figure this out at all.

📎 Untitled.png

errant wave Aug 30, 2018, 5:37 AM

#

Figured it out. Rebuilding navigation worked.

swift bolt Aug 30, 2018, 3:27 PM

#

@fallow gull I actually came here to figure out the same issue! I want to prevent certain objects from having what I'm guessing is the Nav Height including them in nav generation.

#

If I say I don't want them to affect nav mesh they still do because nav height jumps over them

#

does that make sense?

#

Even setting Can Step On to false does nothing, which you think it would.

#

I can probably lower the Step Height but I need it to be this high for proper nav generation of some stairs I have.

#

so If I have a 5 inch high box I don't want the AI to walk on, but Step Height needs to be 7 inches for the stairs, how can I achieve no nav generation on top of the 5 inch box but maintain the 7 inch step height I need?

obsidian kettle Aug 31, 2018, 11:59 AM

#

Hey guys, does anyone know if the 'aiperceptionsourcestimuli' only broadcasts a cone signal to a particular direction. I have found that having a character with a 62deg peripheral vision cone can only detect actors from one side of the actor its facing. Presumable it only really detects the source and the mesh/actor is fairly irrelevant. Or does the source stimuli broadcast a circle so it can be detected from all sides of an actor it is placed on?

pine steeple Aug 31, 2018, 5:29 PM

#

anyone experience jittering when using EQS and MoveTo

#

and solved the issue?

elfin socket Aug 31, 2018, 7:57 PM

#

The Behavior Tree tutorial video that was posted the other day is really good! Here's a link to the full series (5-videos, each about half an hour long): https://www.youtube.com/playlist?list=PLUUXnYtS5hcX5Bq3WRCnkI-p2PW6PBulP
(For those of you who have done AI tutorials in the past and alreaady know the basics, just skip to the final video of the series)

YouTube

Unreal Behavior Trees - YouTube

#

<@&213101288538374145> Can we get a pin for that playlist I just posted? It's really good.

smoky summit Aug 31, 2018, 7:59 PM

#

dreamy surge Aug 31, 2018, 11:51 PM

#

whats the best video to learn how to set up AI

elfin socket Sep 1, 2018, 12:38 AM

#

@dreamy surge I just linked it

dreamy surge Sep 1, 2018, 1:32 AM

#

oh cool

#

because I was using virtus tutorial but it was basic and incomplete

#

I just bought the AI took kit

#

does anyone use the AI behavioral tool kit?

#

I think i need animaton also

dreamy surge Sep 1, 2018, 2:03 AM

#

what do I do first behavior trees or animations?

dreamy surge Sep 1, 2018, 5:55 AM

#

where can I find a good tutorial video showing AI and blueprint set up together?

orchid brook Sep 1, 2018, 9:19 AM

#

Does anyone have any performance metrics on their AI they'd be willing to share? In particular I'm interested to know what sort of benchmark to aim for with the total tick() time for all NPCs. 10ms? More? Less?

dreamy surge Sep 1, 2018, 4:47 PM

#

i need a good video on setting up AI with automation

#

all the animations go over player animations

pine steeple Sep 1, 2018, 8:00 PM

#

well its done with a behaviour tree and animations being done by whatever state the AI is in

gray mulch Sep 1, 2018, 8:23 PM

#

ok people I'm confused: where did UNavigationSystem::FindPathToActorSynchronously() landed?

#

I mean in cpp

pine steeple Sep 1, 2018, 8:35 PM

#

4.20?

gray mulch Sep 1, 2018, 8:38 PM

#

yup

#

just found it

#

UNavigationSystemV1

tropic lily Sep 1, 2018, 10:36 PM

#

Hey can someone help me with the decorators in the behavior tree?

#

For some reason they’re not activating no matter what I do

pine steeple Sep 1, 2018, 10:39 PM

#

sure

tropic lily Sep 2, 2018, 9:03 PM

#

I don’t think I’m doing anything right here

📎 image1.jpg 📎 image0.jpg

tropic lily Sep 2, 2018, 9:29 PM

#

The decorator node doesn’t activate until the sequence ends it’s first cycle.

#

I can’t interrupt it at all

patent hornet Sep 2, 2018, 9:48 PM

#

@tropic lily https://www.youtube.com/watch?v=49Xub-taTig

YouTube

Mathew Wadstein

WTF Is? AI: Service Nodes in Unreal Engine 4 ( UE4 )

What are the Service Nodes in the Behavior Tree in Unreal Engine 4 Source Files: https://github.com/MWadstein/wtf-hdi-files

▶ Play video

sudden drum Sep 3, 2018, 12:55 AM

#

is it normal that my service at the root is not being ticked?

#

it stops ticking after some event i cannot identify

#

and it is the first thing on the BT

keen furnace Sep 3, 2018, 10:51 AM

#

@sudden drum check all your tasks, make 100% sure none of them "dead-exec" - they reach a point with no execute finish, lock the ai tree

#

all exec needs to eventually succeed or fail using an execute finish, a "cast-fail" or branch leading to no exec is usually the prime candidate, watch the tree like a hawk, see what task it did last, and go through it with a fine-tooth

#

https://gyazo.com/55e7ebde6e6ad1f3fd5ad1cc3dd999d3

Gyazo

▶ Play video

#

anyone else having this issue with navmesh?

#

the hole created is permanent in level and cannot be removed, if the level gets saved it gets permanently broken, currently working around it by first placing all the navmods on a remote island to keep it out of potential used area, but this is pretty pants imo

wary oak Sep 3, 2018, 11:24 AM

#

@keen furnace i think you have to move the navmesh to rebuild it

keen furnace Sep 3, 2018, 11:25 AM

#

will give it a try mate, cheers

#

@wary oak fraid not - its still there even if I delete the navmesh, all nav modifiers, the recast navmesh, resave and reopen editor, and place new bounds

wary oak Sep 3, 2018, 11:27 AM

#

how weird, iv never had it stay even if iv deleted the nav mesh... must be a bug

keen furnace Sep 3, 2018, 11:27 AM

#

im reckoning so, will pass it over to epic, cheers though mate 😃

#

tbh had similar in the past but not with navmods, used to be in 4.8 if you created a bp with a collision volume that blocked nav, then disabled "affects nav" on that component - it would leave a permanent "ghost collision" in the map you could even visualise with the colliding geometry vis

wary oak Sep 3, 2018, 11:30 AM

#

i imagine that is what is happening, its like the navmod is hidden

keen furnace Sep 3, 2018, 11:30 AM

#

thats it, its leaving a "ghost" as before, but the previous issue has been fixed for ages - and this leaves no visible ghost with "Draw path colliding geo" aww well!

sudden drum Sep 3, 2018, 3:12 PM

#

@keen furnace Thank you so much for your answer

#

the fact is... that the task it is currently on is the MoveTo task

#

the UE4 implemented one

keen furnace Sep 3, 2018, 3:14 PM

#

not using any other "moveTo" nodes with "lockAI" enabled by chance?

sudden drum Sep 3, 2018, 3:14 PM

#

can i post screenshots?

keen furnace Sep 3, 2018, 3:14 PM

#

sure

sudden drum Sep 3, 2018, 3:15 PM

#

S_GetTargetActor is something I always need running

📎 unknown.png

#

📎 unknown.png

#

📎 unknown.png

keen furnace Sep 3, 2018, 3:15 PM

#

it could be your decorator breaking it

#

check the logic always returns

sudden drum Sep 3, 2018, 3:16 PM

#

📎 unknown.png

keen furnace Sep 3, 2018, 3:16 PM

#

if you only have the moveto does it freeze

sudden drum Sep 3, 2018, 3:16 PM

#

📎 unknown.png

#

sry for that didnt expect so many screenshots

keen furnace Sep 3, 2018, 3:16 PM

#

np

sudden drum Sep 3, 2018, 3:16 PM

#

I don't know how to debug it that well

keen furnace Sep 3, 2018, 3:17 PM

#

to start with just use the moveto

#

then with the service added

#

your S_TryJumping

#

ai trees dont lock for no reason

#

usually its either a latent event or a bad exec flow

#

i think its very unlikely its the ue4 moveto thats causing it

#

so try with just that first

#

then add back your functionality till you can repro a lockup

sudden drum Sep 3, 2018, 3:18 PM

#

ok ill try that 😃 thanks!

#

there is no way to check which of these nodes isn't returning anything_

#

?