#gameplay-ai | Unreal Source | Page 110

sweet acorn Mar 19, 2019, 11:33 PM

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Anyway to rotate the Navigational block collision on a static mesh without rotating the static mesh?

fallow gull Mar 21, 2019, 2:36 PM

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Hi guys, I need help on my Racing car AI.
I can't figure out a way of telling the Ai to slow down before tough turns.
I'm using a spline for the track, And I project the location of the car on the spline, a few meters ahead, and I steer towards that location. When the turns are too narrow, I'd like to tell the car to slow down, do you have any Idea?

tawdry spruce Mar 21, 2019, 2:40 PM

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Hey guys, I have an AI that patrols between 2 path points and crosses a pressure plate every so often. the AI has an item inside of him, a key of sorts, and when I pick the key I want the AI to stop moving and be idle. If you then implement the key again the AI should start moving again. My question would be, what would I be looking for to get the AI to stop moving when you pick this item. (I'm really quite novice to AI and blueprinting so would anyone know how difficult it would be to create this interaction?

📎 unknown.png

fallow gull Mar 21, 2019, 2:43 PM

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I think you can simply have a boolean bHaveItem on the AI that you set to true when It has the key, and to false when it doesn't (when the player takes it). And then you can say if this boolean is true you can move, otherwise, do nothing

upbeat bronze Mar 21, 2019, 3:19 PM

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Hi all!
Is it normal that an ai controller can not be destroyed?

fallow gull Mar 21, 2019, 5:06 PM

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I think it's normal since the ai controller is linked to a pawn. I'm not sure a pawn can be on the map without any controller

worldly mural Mar 21, 2019, 8:10 PM

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How could I get an AI to follow a spline?

slow breach Mar 21, 2019, 8:19 PM

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@worldly mural you get the points on the spline, ai move to those points check location of ai to the location of the spline points, if they match move to the next one.
@upbeat bronze to my knowledge you cant destroy an ai controller since its not in realspace.

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@fallow gull similar to my response of SeanOMik i would check distance to the turn, if x distance away slow to this speed. Then you can add a random float or something in it which could act as like AI awareness. So if its low they are possibly worse on most turns... Etc

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You may beable to attach a pseudo speed limit to the spline points or corners

worldly mural Mar 21, 2019, 8:24 PM

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Okay, thanks @slow breach

slow breach Mar 21, 2019, 8:24 PM

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Np!

worldly mural Mar 21, 2019, 8:41 PM

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@slow breach I'm trying to move the AI to a point, but it doesn't move with the reason of "Aborted"

slow breach Mar 21, 2019, 8:45 PM

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picture

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@worldly mural

worldly mural Mar 21, 2019, 8:49 PM

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I know, its a little messy @slow breach

📎 Capture.PNG

fallow gull Mar 21, 2019, 8:54 PM

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@slow breach Hi, thanks for responding. The thing is that i can't really know when the turn is. I can't place like waypoints on the map manually because it's a large world and it would take me ages. Also there might be procedural circuits, so it's unpredictable. I'd like the Ai to know when there's a turn, and how fast it should arrive in that turn to not go off the track. The distance check is the way to go to make it slow down before turning, the real thing that I'm stuck on is how to make it understand that there's a turn ahead

slow breach Mar 21, 2019, 8:58 PM

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i think the pseudo speed limit signs is the way to go, if you can some how get the curve of a turn and check how sharp it is to set a pseudo speed limit sign

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i would investigate that

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but that is advance level specific stuff :/

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@worldly mural No thats a lot of messy.
You said the reason is aborted. You have to give me more information than that. I havent seen your code, I havent seen the error mesasge, i havent seen how the game plays. So the more information and specifics is your best best. You have a lot cut off in that pic. Do you have a picture of the error message?

worldly mural Mar 21, 2019, 9:01 PM

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@slow breach I mean the error it gives is "Aborted"

📎 Capture.PNG

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The vectors are where its trying to move to

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And the code I sent above

slow breach Mar 21, 2019, 9:03 PM

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have you tried increasing the acceptance radius?
can i see the spline the ai is trying to follow in action

worldly mural Mar 21, 2019, 9:08 PM

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📎 Capture.PNG

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The outer white dotted line @slow breach

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And yes I've tried increasing acceptance radius

slow breach Mar 21, 2019, 9:12 PM

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what are the volumes beside the spline and do the ai spawn correctly?

worldly mural Mar 21, 2019, 9:14 PM

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Those volumes are collision boxes that I would use later, currently the collision for them is completely disabled, so it shouldn't be causing an issue. And the AI does spawn correctly. @slow breach

slow breach Mar 21, 2019, 9:14 PM

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whats your nav mesh look like

worldly mural Mar 21, 2019, 9:15 PM

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It was working earlier before I made code changes, but now only small squares in the corners are built

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The nav mesh wont update either

slow breach Mar 21, 2019, 9:16 PM

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picture

worldly mural Mar 21, 2019, 9:16 PM

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📎 Capture.PNG

slow breach Mar 21, 2019, 9:16 PM

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have you reversed those code changes to see if it works then?

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have you built the game recently?

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to see if that fixes it

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the reason its aborting is the nav mesh theres ur answer

worldly mural Mar 21, 2019, 9:17 PM

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Yeah

slow breach Mar 21, 2019, 9:17 PM

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lol...

worldly mural Mar 21, 2019, 9:17 PM

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I know that now

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lmao

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How do I build the game though?

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I haven't had to build it. I've packaged it, but not built it.

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@slow breach

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Oh wait

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Nvm, I just found the build button at the top

slow breach Mar 21, 2019, 9:19 PM

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yeah that one

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and the arrow beside it lets you build specific thigns

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im pretty sure nav mesh gets rebuilt in that but i could be wrong

worldly mural Mar 21, 2019, 9:19 PM

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Looks like its moving

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The AI's I mean

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Thanks!

slow breach Mar 21, 2019, 9:20 PM

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nice

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np

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yeah i didnt know about connecting the ai move to enum into a print string to get aborted

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that is useful, that would have helped me

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but the only reason i could come up with for it aborting is if something is blocking it from moving

pliant mesa Mar 22, 2019, 9:43 AM

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@floral mango So I found the utility plugin https://wiki.unrealengine.com/Behavior_Tree_Utility_Plugin Is there any good tutorials for it?

Behavior Tree Utility Plugin

floral mango Mar 22, 2019, 10:15 AM

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the wiki page explains the basics. you use decorators to calculate the utility of each branch, the utility selector selects the highest one (or uses weighted random)

pliant mesa Mar 22, 2019, 10:16 AM

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Ok so they still run tasks the same as BT

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I'll mess around with it

floral mango Mar 22, 2019, 10:27 AM

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yeah, utility is just using a scalar value to rank the relative 'utility' of different actions....it's that simple

pliant mesa Mar 22, 2019, 10:28 AM

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Yeah thanks for this

tiny bridge Mar 22, 2019, 5:00 PM

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Hi, I am trying to build AI controlled character which can navigate and jump on area of constantly moving platforms. I have problem with dynamic nav mesh generation on runtime. Nav generates and updates on runtime, but most of my generated nav mesh shows as red aka dirty areas instead of those good green ones. That apparently affects to my AI target and path finding. AI move target is random navigable point in specific radius of AI bot itself. I have implemented AI jumping trough line trace which checks if there is platform in front of AI bot and if there is not it will jump. Also tried to put some nav links on moving platforms to help AI to navigate trough those platforms. Any tips how to solve that nav mesh problem? Or this kind of AI even possible to do?

patent hornet Mar 23, 2019, 1:12 AM

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Try slapping a NavInvoker (might be NavigationInvoker) component to it

tawny copper Mar 23, 2019, 10:47 AM

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This image is what happens in @AnaZuida platformer currently with NavMeshes. Any ideas?

📎 unknown-3.png

wary ivy Mar 24, 2019, 4:51 PM

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what happens?

acoustic fossil Mar 24, 2019, 5:53 PM

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Does anyone know how to test if a point is in a navigation area?

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I am trying to test the point in a custom EQS test

pine steeple Mar 24, 2019, 9:34 PM

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EQS can test that

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@acoustic fossil

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http://interkaos.com/grabs/UE4Editor_2019-03-24_21-35-05.png

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set that to filter

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and it will remove any points that are not navigable

acoustic fossil Mar 24, 2019, 9:36 PM

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I tried that, but it looked like it removed the path as well. The path can go through the marked areas (and practically has to), but I dont watn the actual point to be in it

pine steeple Mar 24, 2019, 9:36 PM

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im confused :/

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so it can path through a non navigable area?

acoustic fossil Mar 24, 2019, 9:41 PM

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its not a non-navigable area, there is just a certain area that I do not want the eqs to return

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The enemie is moving to cover from the player, and the simplest solution to prevent their legs from sticking out over the wall is to mark the places that can still be seen

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It is for a small enviroment

pine steeple Mar 24, 2019, 9:55 PM

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then put a modifier over it

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and set a filter

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and have the PathExist use that filter

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and filter areas your dont want

acoustic fossil Mar 24, 2019, 10:03 PM

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I've tried that, and I'm pretty sure it filters the path as well

glacial kiln Mar 25, 2019, 1:26 AM

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Is there an upper bound on the number of navigation path nodes that can be used at one time with a default navmesh?

fluid sparrow Mar 25, 2019, 2:32 AM

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does this look like an area where an AI can get stuck?

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https://cdn.discordapp.com/attachments/537799627508940823/559560796623863829/unknown.png

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My AI often gets "stuck" and stops moving to an area

hybrid cipher Mar 25, 2019, 1:45 PM

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@fluid sparrow well yea it does look that way, although even if the representation of navmesh doesn't need to be 100% accurate, it can still become a bottleneck that will make navigation more difficult

crystal grotto Mar 25, 2019, 2:30 PM

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How should i mark positions on the map for a AI ?

crystal grotto Mar 25, 2019, 4:22 PM

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Or how can i refer an object in the world in my service ?

crystal grotto Mar 25, 2019, 5:18 PM

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Not sure if you should do that in the AI. I'd do it within the blueprints.

quartz urchin Mar 25, 2019, 9:03 PM

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Hey Everyone. Need some help with AI. What is the best way to tell NPC change state if he can not reach target location ( move to) For instance Just blocked by static mesh? I've tried to use time limits for tasks but this seems to be not the best solution.

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just to explain problem

📎 unknown.png

hybrid cipher Mar 26, 2019, 12:04 AM

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BT has Path Exist decorator, maybe look into it, but it also depends on your particular case

sweet acorn Mar 26, 2019, 1:00 AM

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Nothing anywhere on this. Anyone know how to set affiliation for senses? I can click detect enemies, friendly and neutral. However, where do I set those up at?

hybrid cipher Mar 26, 2019, 1:39 AM

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@sweet acorn I tried this, unsuccesfully I gotta say, but here's something that might help https://answers.unrealengine.com/questions/535293/aiperception-affiliation-implementation-in-c.html currently C++ only I think

lyric flint Mar 26, 2019, 2:06 AM

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@quartz urchin if there is literally no path the air will stop. You can expand your navmesh. You should use 'AI move to'. This will give s true/false if so reaches location or gets blocked.

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Ai will stop*

quartz urchin Mar 26, 2019, 2:22 AM

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Thanks @lyric flint

sweet acorn Mar 26, 2019, 2:58 AM

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@hybrid cipher Thanks! C++ is just fine. Weird they have almost no information about it around.

hybrid cipher Mar 26, 2019, 2:59 AM

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Oh yeah it is a bit of a forgotten part I think, I heard ppl just make due with tags anyway

fluid sparrow Mar 26, 2019, 4:30 AM

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question for you AI gurus

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I have a navmesh my AI uses, and i use a "AI MoveTo" blueprint node with an acceptance radius of 100 to chase the player

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however, in my multi-story level, there is a position where the AI will chase the player in the correct x-y coordinates, but it will chase the player in the exact position, but on a higher floor

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how do i ensure that the AI is chasing the player on the same floor that they are on?

crystal grotto Mar 26, 2019, 10:38 AM

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@fluid sparrow Maybe this helps you.
I'm using this as some kind of random vector. There you could select the height.

📎 unknown.png

sweet acorn Mar 26, 2019, 10:31 PM

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Anyway to activate the pawn from a stimulus when it is spotted by a sight perception?

hybrid cipher Mar 27, 2019, 1:20 AM

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Hey, is it possible to play animation on my AI character from BT? I'm trying to model non-combat state, but just using Play Animation Task doesn't seem to do anything. Or do I have to work it into animation state machine?

patent hornet Mar 27, 2019, 9:17 AM

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You can use a montage to effectively override the anim state machine for its duration (on the whole body or just a part of the skeleton), and you can play it from BTTask

lyric flint Mar 27, 2019, 9:40 AM

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Hello, I've been following a tutorial for AI in c++
And I'm stuck as unreal won't compile anymore because of :
" ABrunrealCharacter *Enemy = Cast<ABrunrealCharacter>(GetWorld()->GetFirstPlayerController->GetPawn());"

Unreal says :
"BTService_CheckForPlayer.cpp(26) : error C2227: left of '->GetPawn' must point to class/struct/union/generic type"

"ABrunrealCharacter" is the default character from the top down template
The tutorial is using the third person tutorial, but I did the exact same steps with top down.

Any idea what happens there please ?

magic jasper Mar 27, 2019, 10:01 AM

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GetWorld()->GetFirstPlayerController->GetPawn()

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needs to be:
GetWorld()->GetFirstPlayerController()->GetPawn()

lyric flint Mar 27, 2019, 10:13 AM

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hm thanks but then GetWorld() throw an error "pointer to incomplete clas type is not allowed"

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ah nvm it was missing an include, thank you very much !

hybrid cipher Mar 27, 2019, 10:54 AM

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@patent hornet so simple play animation won't do?

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@lyric flint you need to import world.h

patent hornet Mar 27, 2019, 10:56 AM

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actually he needs () after GetFirstPlayerController

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anim graphs should be used to cover general cases, adding special animations to them makes the graph ever more complex, and it scales poorly

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when you play a montage it just play it for its duration and switch back to animgraph

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you can pull any of the paragon characters (i think they all come with anim BP by now) from the epic store and see how epic did it with Paragon

lyric flint Mar 27, 2019, 10:59 AM

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I needed both () and world.h, it's all working fine now, thanks :)

hybrid cipher Mar 27, 2019, 11:00 AM

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Nah I meant playAnimation method from skeletal mesh component, trying to understand why it wouldn't work

patent hornet Mar 27, 2019, 11:01 AM

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it probably would

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montages are better tho, simple to make and give you far better control

hybrid cipher Mar 27, 2019, 11:02 AM

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Kk thx i will check it out

wraith eagle Mar 27, 2019, 4:50 PM

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Hey, so (hopefully) a quick question:
Is there a "nice" way to change the cost of a navmodifier component without the dynamic nav mesh rebuild kicking in? I don't really need to change the NavArea, I just want to increase or decrease the cost slightly, but I can't seem to find a way

arctic crag Mar 27, 2019, 6:07 PM

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So I'm working on animal AI and the animals have a state, "INTERACTING". How can i make the BT stop whatever it's doing when this state is entered?

lyric flint Mar 27, 2019, 6:46 PM

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"Error LNK2001 unresolved external symbol "public: virtual enum EBTNodeResult::Type "

But why ? : (
Google says missing "GameplayTasks", but I already have it :

"PublicDependencyModuleNames.AddRange(new string[] {"Core", "CoreUObject", "Engine", "GameplayTasks", "AIModule", "InputCore", "NavigationSystem"});"

Any idea again please ? (last time with noob question, sorry)

patent hornet Mar 27, 2019, 7:35 PM

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@arctic crag check out WTF is? Decorators video on youtube, pay attention to the part with ObserverAborts

arctic crag Mar 27, 2019, 7:42 PM

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@patent hornet I figured so. I must not have setup my custom decorators correctly. Thanks

wide tartan Mar 28, 2019, 3:49 PM

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why if I change the role of an ai controlled pawn to autonomous_proxy, movetolocation doesn't work anymore?

pine steeple Mar 29, 2019, 9:34 AM

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because moveto sends requests to ai controller

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which only moves simulatedproxy

buoyant vault Mar 29, 2019, 9:40 AM

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Hey! 😃 does anyone know if its possible to generate navmesh using static mesh components? I have a large map with roads, and i want the sidewalks to generate navmesh. is the only way for me to do it to add alot of navmesh bounds volumes? i see that the static mesh editor has navigation options, but they dont seem to work in editor straight away?

pallid mica Mar 29, 2019, 9:52 AM

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Your Meshes needs to have Collision

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That's basically all it needs to genereate the NavMesh

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One Volume should be enough

buoyant vault Mar 29, 2019, 10:04 AM

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The sidewalks are instanced static mesh components though :/ im getting the normal generation on it, but im using a navarea class and thats not being applied.

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The Sidewalks are generated from a blueprint, using the same mesh (spline mesh component)

the other one with the correct navigation (blue) is just the static mesh dragged into the world

📎 55881980_420588078510882_1820050038731046912_n.png

compact hull Mar 31, 2019, 9:28 AM

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So, I've got some interesting behavior..
https://puu.sh/D7TXm/7026441efe.gif
(RED = Forward Vector, BLUE = MoveVelocity, RED SPHERE = Target)

It's often giving a (Completely) different MoveVelocity when RequestDirectMove is called..?
It's triggering OnMoveComplete (failure) way too early..

        MoveToLocation( target, 5.0f);

https://puu.sh/D7U3C/7f736e3b06.png

Any thoughts? :s

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I'm guessing it's incorrectly detecting that it's stuck and is therefor trying alternate routes..
eventually giving up..

Am I missing a KeepAlive call or something? :s

wary ivy Mar 31, 2019, 1:09 PM

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@compact hull there's a function in C++ world that allows you to query the vector to the closest navmesh wall

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you could maybe use that for detecting when something is stuck

compact hull Mar 31, 2019, 2:36 PM

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@wary ivy I'm not trying to detect if something's stuck
I mentioned that as a plausible cause for its wild changes in direction/prematureFailure

wary ivy Mar 31, 2019, 2:36 PM

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ah

compact hull Mar 31, 2019, 2:41 PM

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Yeah, really weird, I'm guessing something keeps reporting the pawn as stuck which causes things to fuck up :s

echo ether Apr 1, 2019, 12:01 PM

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@floral mango , Hey it's me again. I've been trying to use the SVON plugin to another map. But in the output log, this is the only message i'm getting "finding path from node A and node B". therefore pawn gets stuck at the same point. Any idea what's wrong?

magic jasper Apr 1, 2019, 12:11 PM

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@compact hull what VS extension is that which shows function param names?

compact hull Apr 1, 2019, 12:12 PM

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@magic jasper Pretty sure that's resharper's doing :)

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Relatively new feature

magic jasper Apr 1, 2019, 12:14 PM

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Ahhh kk. I'm a VAX user 😃

compact hull Apr 1, 2019, 12:15 PM

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Yeah, that's on ma to-check list :p

echo ether Apr 1, 2019, 12:37 PM

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@floral mango , nvm, I think i fixed it.

remote dawn Apr 1, 2019, 6:45 PM

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Hello, everybody.
I am currently working on an RTS game and have problems with the NavMeshBoundsVolume. The problem is, I'm setting houses and the AI is trying to walk through the house instead of around it. Can I update the NavMeshBoundsVolume somehow?

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or do I still have to set something at my house Actors so that they are recognized?

fallow hound Apr 1, 2019, 11:40 PM

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@remote dawn a couple things, run time generation of navmeshes might have to be activated in project settings

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and another thing, make sure the house mesh is set to block navmesh

remote dawn Apr 2, 2019, 11:26 AM

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@fallow hound thx for the answer. i found it under projectsetting -> NavigationMesh -> runtime -> runtimegeneration (it was static)

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but when is choose dynamic the ai dont walk anymore.. what i do false?`

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maybe you know a little tutorial that shows you how to do it?

pine steeple Apr 2, 2019, 3:46 PM

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dynamic is a bit iffy

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mostly used when you have nav inokers on the pawns

fallow hound Apr 2, 2019, 4:42 PM

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nav invokers are pretty cool though

remote dawn Apr 2, 2019, 5:08 PM

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hmm. i switch back to static but the ai also don't walk anymore.. i have the navmesh and recast deleted and replaced..

reef glen Apr 2, 2019, 5:33 PM

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Does someone knows how can i play an anim montage using blackbord when the ai health is 0?

reef glen Apr 2, 2019, 6:43 PM

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https://www.youtube.com/watch?v=9jeWaJEVoZM&feature=youtu.be please can someone help me with this

YouTube

6ths

Behaviour tree bug

▶ Play video

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I want the animation to only be player once

patent hornet Apr 2, 2019, 10:23 PM

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put in a decorator that doesn't allow it to be played more then once/if they are dead/downed

reef glen Apr 2, 2019, 11:02 PM

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How

patent hornet Apr 2, 2019, 11:04 PM

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pretty sure there is one in engine that allows only for N executions

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failing that, bool IsDead, get it into blackboard and check for it

remote dawn Apr 2, 2019, 11:41 PM

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@fallow hound @pine steeple i have found the problem. i have on testing unchecked the Can be Main Nav Data. with checked all work fine 😃

fallow hound Apr 2, 2019, 11:42 PM

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Nice!

echo ether Apr 4, 2019, 4:57 AM

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@floral mango , Hey, Basically the plugin displays 2 information when it is unable to find path to the target location. 1- failed to find start nav link. 2- Failed to find target nav link. Is it possible to use those messages and perform actions based on that? Like for example for 1, it starts moving upwards or when 2 happens, it starts emitting particles etc?

visual berry Apr 4, 2019, 5:40 AM

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I have an AI that I've disabled use controller yaw on so it doesn't snap turn, but now if the player intentionally runs into the AI's collision it stops it from turning, any idea how I can fix that?

viscid oasis Apr 4, 2019, 11:56 AM

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EQS isn't deprecated, is it?

pine steeple Apr 4, 2019, 12:08 PM

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no

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who said that

viscid oasis Apr 4, 2019, 12:40 PM

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it's on the EQS editor

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just checking - just certain sections

remote dawn Apr 4, 2019, 12:56 PM

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Hello together
What's the best practice if I want two AI's to move an object to another location?

hybrid cipher Apr 4, 2019, 9:56 PM

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@viscid oasis EQS is still experimental (marked so), which from what I heard is mostly due to fact UE still doesn't have editor support they want

hybrid cipher Apr 4, 2019, 11:03 PM

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hey, anyone ever encountered issue where play montage called from BT only starts when previous animation finishes? stop montage called from BT doesn't seem to do much either. MP game

mystic dock Apr 4, 2019, 11:56 PM

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Your animations perhaps addressing different slots, so the previous montage won't stop maybe. Just a thought.

hybrid cipher Apr 5, 2019, 12:04 AM

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only using default slot (I think?), been doing some more digging and when StopAllMontages is called, MontagesInstances is Empty (so there's nothing to stop)

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so on second thought you might be right :)

subtle axle Apr 5, 2019, 9:46 PM

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Hello

stark zealot Apr 5, 2019, 10:08 PM

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I need help. I'm making a simple zombie Behavior Tree and for some reason I can't get a Decorator to pass. It fails everytime even though I think I'm setting the variable. https://i.gyazo.com/85b0b6e5107cbb4c285062df3f93de6d.png

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https://i.gyazo.com/1241f2f1863529c98417ffa2494fef2f.png

low oak Apr 6, 2019, 3:16 AM

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hi all, is that a way to change blackboard value through animnotify?

jaunty peak Apr 6, 2019, 3:25 AM

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@stark zealot Shouldn't your Finish Execute be ticked as successful?

stark zealot Apr 6, 2019, 6:07 AM

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@jaunty peak Well I thought the same thing but it didn't leave the middle branch if I left it checked. So by leaving it unchecked it left the branch and went back to root

viscid oasis Apr 6, 2019, 8:47 AM

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Do you still have to create custom EQS queries via CPP first?

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I used them a lot about 6 months ago but I can't remember how they work

jaunty peak Apr 6, 2019, 2:23 PM

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@stark zealot I don't know much, but I'm guessing that the NPC can't ever be at the players location because the player is there. Maybe remove the set node from the task, and use an overlap event for when the NPC gets close enough ?

hybrid cipher Apr 7, 2019, 1:12 AM

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@viscid oasis if you want custom generators or tests then I think you will have to use CPP, query itself can be done in editor, you just pick the generator and attach tests to it, the built-in ones are good for many general scenarios

viscid oasis Apr 7, 2019, 1:19 AM

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Yeah I figured as much - that's not an issue, I just plum forgot how to do them.

patent hornet Apr 7, 2019, 1:20 AM

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you can do custom generator in BP just fine

viscid oasis Apr 7, 2019, 1:21 AM

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I can only get one context (context vectors)

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Maybe it's the BP type I'm deriving?

hybrid cipher Apr 7, 2019, 1:22 AM

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well if you want c++ tutorial I've got a bunch that helped me

viscid oasis Apr 7, 2019, 1:22 AM

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I'm not too fussed with the moment; I've come across a few.

trail saffron Apr 7, 2019, 10:31 AM

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hi guys.
in an RTS game, how would I go about controlling multiple units? I did some research and this seems to be the way:

every unit has an AI controller.
the playercontroller does not possess any unit directly.
when a unit is selected, the playerController issues commands to the corresponding AIController of the unit, and the command is then executed.

is this a good way?

dusky lodge Apr 7, 2019, 11:01 AM

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Pretty much

trail saffron Apr 7, 2019, 11:05 AM

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okay thanks

patent hornet Apr 7, 2019, 11:08 AM

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@trail saffron do not keep any relevant data as variables in the PC, keep them in AIController, and have Get functions for them in the PC

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or keep them in the Pawn itself

trail saffron Apr 7, 2019, 11:11 AM

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👍 thanks for the info @patent hornet

patent hornet Apr 7, 2019, 11:12 AM

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depends on if the game is single player or not, AIControllers don't normally replicate

trail saffron Apr 7, 2019, 11:16 AM

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oh, it's multiplayer

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would I simply replicate the AIControllers then or use a different approach all together?

patent hornet Apr 7, 2019, 11:22 AM

#

i replicate mine, but i have 1 pawn per player

#

if i had more, i'd use the Pawn to store data

trail saffron Apr 7, 2019, 11:35 AM

#

does this even make sense?

📎 unknown.png

near jetty Apr 7, 2019, 11:36 AM

#

is it for a strategy game?

trail saffron Apr 7, 2019, 11:36 AM

#

yes, online rts

near jetty Apr 7, 2019, 11:36 AM

#

pro tip. Do not use Character/controller on your units

#

use Actor

#

in general you want to have a good bunch of units. And they are all dumb. Its best to forget the whole Pawn/Controller thing

#

it is super expensive, designed for player characters, where you only have a handful

#

main issue is the pathfinding, only Characters can pathfind... So go with Character/controller for now, but do not have ANY AI on the unit

#

just use the MoveTo stuff

#

eventually you will want to have your own path-follow logic and just Actors for units

#

if you want to do multiplaer... i recomend you desist. Unreal multiplayer doesnt work for RTS games

#

you would need to create your own systems

#

having like a hundred replicated characters for each player will nuke performance on every machine + use absurd amounts of bandwidth

trail saffron Apr 7, 2019, 11:41 AM

#

nah it will definitely be under 10 units for each player

near jetty Apr 7, 2019, 11:41 AM

#

how many players

trail saffron Apr 7, 2019, 11:41 AM

#

6

near jetty Apr 7, 2019, 11:41 AM

#

60 replicated characters is quite a lot

#

for reference, both PUBG and Fortnite have 100 replicated characters, and it requires super powerful servers + grinds every machine to a halt even with their insane optimization

#

becouse its not just 60 characters, is their animation events, shooting, dying, etc

trail saffron Apr 7, 2019, 11:50 AM

#

well, to desist is not an option 😄

#

you gave me something to think about, tho

near jetty Apr 7, 2019, 11:52 AM

#

make sure to test your game with 6 players and all characters on real internet every few weeks

#

to avoid it going to absolute shit and you not realizing

trail saffron Apr 7, 2019, 11:53 AM

#

yeah, if it ever reaches that point I'll definitely do that

#

you said I should use actors instead of characters. is having simple "MoveTo()" and "Attack()" really less expensive than having an AIController? what about AttackMoveTo()? I'd have to check if there's an enemy in range every tick

near jetty Apr 7, 2019, 11:54 AM

#

a lot cheaper

#

Character class does very complicated movement code

#

if you use Actors (or at least a custom character movement component) you can make things MUCH simpler

#

just do 1 trace down and snap to floor

#

Character does quite a lot of checks when you move

trail saffron Apr 7, 2019, 11:55 AM

#

that's very good to know, thank you!

#

can I still use a navmesh with simple AActors?

#

~~oh I just read that navmesh and multiplayer don't mix well~~
at least I have to enable it manually. the question about navmesh and AActors still stand tho

near jetty Apr 7, 2019, 12:09 PM

#

oh, no issue

#

the problem is the path follow

#

there is a function that is "give me the path beetween A and B"

#

and then you can use your own code to move on that path

#

you essentially get an array of FVectors for the path points

trail saffron Apr 7, 2019, 12:12 PM

#

is there any data on networking cost in regards to actor vs character, aicontroller etc. ? I'd rather use the simpler solution (in terms of programming) if hosting a server doesnt require triple A budgets.

#

like benchmarks or something

#

maybe I should ask in the multiplayer channel

#

https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/95495-network-replication-cost-and-relevancy

Unreal Engine Forums

Build powerful visual scripts without code.

bold sapphire Apr 7, 2019, 5:44 PM

#

Any way to exclude an actor class from being detected by AIPerception?

patent hornet Apr 7, 2019, 6:23 PM

#

don't have an AIPerceptionStimuli component on it?

bold sapphire Apr 7, 2019, 6:33 PM

#

Players team needs to detect only enemy team and enemy team need to detect player team.

#

Right now every character detects every character. So it has to run through all of them till it hits one that is a valid target. I would like it exclude class types and set that on each characters begin play.

patent hornet Apr 7, 2019, 6:48 PM

#

i think they never got the team interface to work

#

for AIPerception

#

it looks very unfinished

bold sapphire Apr 7, 2019, 7:01 PM

#

well its working. I just think it is working harder than it should. Looking into detection by affiliation.

#

ah I see it can't be set via blueprint...

patent hornet Apr 7, 2019, 7:06 PM

#

there is a live stream with perception from 3 years ago

#

the entire module is still in exactly the same state as when that stream was made

bold sapphire Apr 7, 2019, 7:21 PM

#

yea so the only option I see is that I am going to have to turn on and off perception when they have or don't have a target.

bold sapphire Apr 7, 2019, 8:38 PM

#

lol mod told me games make their own perception system and tailor it to the games needs. I guess I have to get on it and make that happen.

graceful saffron Apr 8, 2019, 4:59 AM

#

do nav mesh volumes not rotate?

#

📎 Capture.PNG

#

green area stays the same no matter how i rotate the volume and rebuild, etc.

karmic vessel Apr 8, 2019, 6:54 AM

#

Hey, the ProjectPointToNavigation method in NavigationSystem.h is marked as deprecated. It is stated to use the new version. But I can not find it. Where would I find the new version? Thanks in advance

patent hornet Apr 8, 2019, 7:42 AM

#

    UFUNCTION(BlueprintPure, Category = "AI|Navigation", meta = (WorldContext = "WorldContextObject", DisplayName = "ProjectPointToNavigation_DEPRECATED", DeprecatedFunction, DeprecationMessage = "This version of ProjectPointToNavigation is deprecated. Please use the new version"))
    static FVector ProjectPointToNavigation(UObject* WorldContextObject, const FVector& Point, ANavigationData* NavData = NULL, TSubclassOf<UNavigationQueryFilter> FilterClass = NULL, const FVector QueryExtent = FVector::ZeroVector);

#

there are 2 overloads with different signature in the same header

#

    // @todo document
    bool ProjectPointToNavigation(const FVector& Point, FNavLocation& OutLocation, const FVector& Extent = INVALID_NAVEXTENT, const FNavAgentProperties* AgentProperties = NULL, FSharedConstNavQueryFilter QueryFilter = NULL)
    {
        return ProjectPointToNavigation(Point, OutLocation, Extent, AgentProperties != NULL ? GetNavDataForProps(*AgentProperties) : GetMainNavData(FNavigationSystem::DontCreate), QueryFilter);
    }

    // @todo document
    bool ProjectPointToNavigation(const FVector& Point, FNavLocation& OutLocation, const FVector& Extent = INVALID_NAVEXTENT, const ANavigationData* NavData = NULL, FSharedConstNavQueryFilter QueryFilter = NULL) const;

#

@karmic vessel

#

and a K2_ version exposed to blueprints

karmic vessel Apr 8, 2019, 7:47 AM

#

@patent hornet thanks a lot

slow breach Apr 9, 2019, 12:43 AM

#

@graceful saffron you need to rebuild navigation sometimes

graceful saffron Apr 9, 2019, 12:58 AM

#

@slow breach nothing happens when I do that, it just stays the same unless I'm building it wrong

slow breach Apr 9, 2019, 1:36 AM

#

sometimes it gets stuck or shows the wrong navigation, sometimes it just needs time to refresh the visualization of it i think

#

maybe restart the engine will refresh it

#

https://gyazo.com/c0c9c2a0939b69032fd90255690ccc0b

Gyazo

#

thats how you build it tho

graceful saffron Apr 9, 2019, 2:40 AM

#

yeah doesnt fix it

#

i dont think you can rotate the nav mesh because I loaded up 3 different engine versions and its the same thing in all 3

deep shoal Apr 9, 2019, 10:24 AM

#

The navmesh on my test level is baking above the ground and it's not continous. Any idea what could be the problem?

📎 20190330_145435.jpg

#

📎 20190330_145455.jpg

hearty delta Apr 9, 2019, 9:17 PM

#

Does anyone know why my AI might be getting caught in a Move To node? I'm trying to implement AI in a networked multiplayer game and once the AI starts its move to node, it initially starts moving to the point only to stop well short and be trapped in the node forever. I checked and the nav mesh encompasses the entire area and I've tried adjusting the acceptable radius but nothing works

#

📎 unknown.png

pine steeple Apr 9, 2019, 10:42 PM

#

normally caused by the pawn cmc not having walkspeed set

#

or being in MOVE_None mode

slow breach Apr 10, 2019, 12:32 AM

#

@deep shoal i believe it's because of the collision of your models

#

Nav mesh generates ontop of collision i think

viscid tiger Apr 10, 2019, 9:41 AM

#

hay all, how do I get a pawn sensing actor to shoot up from the ground?

hearty delta Apr 10, 2019, 5:54 PM

#

@pine steeple That doesn't seem to be the issue. I managed to sort of get it to work by adding a time out on the move to and setting the wander to only find a new location once it reaches its current one. The problem with this implementation is that the AI's movement is jittery and stops momentarily when the timeout executes

📎 unknown.png

pine steeple Apr 10, 2019, 5:54 PM

#

i dont use move to location

#

its terrible

#

i teleport an actor around

#

and have the ai goal track it

#

makes smoother movement

hearty delta Apr 10, 2019, 5:55 PM

#

What do you mean by goal track?

pine steeple Apr 10, 2019, 5:55 PM

#

if you supply an actor to the move to

#

and tick goal tracking

#

you simply move the actor around and the ai will follow that

#

the actor will just be an invisible actor

#

so you set location on the actor and you move that around

#

and ai just folllows it

#

allows for smoother movement without the stop start jitter

eager idol Apr 11, 2019, 11:44 AM

#

Hey ya'll. what's the ideal way to approach a simple vehicle movement (controlled by AI)? No need for animation or wheels, it's just a forklift model moving around the scene picking stuff up and dropping it.

quaint bramble Apr 12, 2019, 12:45 AM

#

hi there, anybody have any idea why the debug shows AI Perception when placed on a third person player controller but not when its placed on an AI controller?

pine steeple Apr 12, 2019, 1:00 AM

#

no clue, AI perception component should be on the controller

#

i never have issues with it

quaint bramble Apr 12, 2019, 1:08 AM

#

🤔 Supposed to be on the AI Controller right?

pine steeple Apr 12, 2019, 1:09 AM

#

yh

quaint bramble Apr 12, 2019, 1:18 AM

#

Ok, so this is really dumb, but I somehow had two AI Controllers that had the exact name and I was using the wrong one that didn't have AI perception. 😅 Ignore me lol. And also maybe someone who has more AI knowledge can answer that guy above me

lean cliff Apr 12, 2019, 1:11 PM

#

Has anyone here got any experience in creating Baked Timetables for AI? Looking to create a baked AI schedule (non-dynamic) over a set amount of time and it would be great to have some advice from someone who's worked on a similar system

drowsy canopy Apr 12, 2019, 6:27 PM

#

Hey, does anyone know how to make flying AI? I can't seem to figure it out and it's been bugging me for a while

lyric flint Apr 13, 2019, 2:41 PM

#

https://www.youtube.com/watch?v=G5bJP5Nr88o try this @drowsy canopy

YouTube

Peter L. Newton

Unreal Engine 4 Flying AI Project Path Following

[Project] https://forums.unrealengine.com/showthread.php?25073-DOWNLOAD-A-I-Templates-Community-Project-Bot-Car-amp-Flying-AI We continue the series on Flyin...

▶ Play video

#

Hello, I have an issue, I was following Asher Einhorn’s AI series and I ran into a problem, I’m trying to add a memory marker every time the trace by channel hots the character, but its doing it every few times it hits the character, the memory marker in the AI is meant to have it to where once he sees you, he’ll follow you, but once you go and find cover or when you hide, he will stop.

Heres the tutorial followed:

https://www.youtube.com/watch?v=qGYvGsakJPk&t=609s

YouTube

Asher Einhorn

Creating AI in UE4 Part 5 - Memory

Here we cover adding memory to the AI, so they don't instantly forget you when you walk behind a wall. It's a pretty simple process so don't be put off by th...

▶ Play video

foggy sluice Apr 13, 2019, 8:22 PM

#

Hello, maybe someone know why I cannot see "Environment Query System" when I enabled EQS in project settings on the 4.22 version ?

#

📎 1234.png

#

i cannot create :/ it

#

oh, ye it's not Project settings it's in the Editor Preferences. Yea 😃

jaunty peak Apr 13, 2019, 9:30 PM

#

Anyone know why the sound that plays when my NPC responds to it hearing a noise (the player whistling), also gets played as it searches for me? The noise report happens only once.

jaunty peak Apr 13, 2019, 10:44 PM

#

Scratch that. Can anyone tell me what the output pin "Info Last Sensed Stimuli" from a Get Actors Perception actually contains? Documentation on it seems to be scarce. I know it's an array of the AIPerception component, it's just the naming of it suggests only the last sense that was updated would be contained? Sounds dumb maybe, but.. my mind works in mysterious ways lol

https://imgur.com/55dzOgB

Imgur

jaunty peak Apr 13, 2019, 11:10 PM

#

While we're at it, any reason the game would "remember" the noise report from previous plays? Only now it's responding to a noise report that's not been reported.

rough inlet Apr 14, 2019, 4:20 AM

#

Does anyone have any recommendations for any good paid open world pathfinding AI? Needing it for zombies, and we are expecting to extend onto it our own custom behaviours

teal skiff Apr 14, 2019, 11:24 AM

#

My hair isnt attaching to my characters head socket when i spawn it ingame, any fix

#

?

#

My bad wrong channel

signal kindle Apr 14, 2019, 3:21 PM

#

Hi folks,

#

Does anyone know of any documentation or run down on the overridable functions of Blueprint Services?

#

📎 unknown.png

#

Tick is self explanatory, but I can't find explanation as to what search start, deactivation or activation are for.

#

or when I would use them, I should say.

#

Will a blueprint graph run from "receive activation AI" actually execute regularly after the branch has started?

patent hornet Apr 14, 2019, 5:16 PM

#

@signal kindle there are WTF is? videos that explain each AI node quite well on youtube

signal kindle Apr 14, 2019, 5:18 PM

#

ah! good shout

signal kindle Apr 14, 2019, 5:47 PM

#

Okay Decorators and Services are really confusing me 😟

#

I want a decorator that only executes a sequence node if a blackboard key Bool is true

#

I expected key == true to be a built in decorator so I'm hesitant to make a custom one

#

does one of the built in decorators do this?

#

This feels like a silly way to check a key - do I really have to make the name?

#

📎 unknown.png

jaunty peak Apr 14, 2019, 6:27 PM

#

on the node you want a check on, right click - add decorator - blackboard. make sure this new decorator is selected and on the right you can pick which BB key you want to use, and what it has to be set, not set, == et cetera to. You don't need to use get in this case.

#

Decorators are best thought as things with conditions to check. Services are just another kind of task really.

signal kindle Apr 14, 2019, 7:17 PM

#

fantastic - I think I was confused because in my mind a bool with a value of 0/False is "set" to false

#

in regards to naming keys, I've found blackboard key selector variables but I can't find any explaination of them

jaunty peak Apr 14, 2019, 7:44 PM

#

@signal kindle Check this guys tutorials out, especially the AI one. The snacksize one is good for basics if you need them, or want a refresher. https://www.youtube.com/channel/UCsS5i15vvUbwfr_1JdRKCAA/playlists

Also this the famoose Mathew https://www.youtube.com/channel/UCOVfF7PfLbRdVEm0hONTrNQ/videos

YouTube

Ryan Laley

Welcome to my channel where I talk about games, games design, and give tutorials on games development. I am a game developer and teacher of games development...

YouTube

Mathew Wadstein

This channel is dedicated to exploring Unreal Engine 4 and the Blueprint programming language that it uses. You can think of it as a companion to the API doc...

#

Think of the Blackboard keys as just a list of variables. This list can be accessed by other BPs which is really handy when you want one BP or task or whatever to store something, Say you have a task that sets a variable to true. once you've made a decorator with a blackboard type, you can tell it to use the one you just set. so you can check to see if it's set or not set. you can also pass the value of the key to a variable in another BP and do stuff with it. Passing info between BPs or Tasks or whatever is done via the Blackboard.

signal kindle Apr 14, 2019, 8:23 PM

#

Thanks for the links! The Ryan Laley videos look great for some practical examples

#

I am familiar with the absolute basics of Blackboard Keys

#

but it's Key Selectors I can't find anything about

#

Confusion between these two

📎 unknown.png

#

I guess practically I'll just stick with making names! It's working

signal kindle Apr 14, 2019, 8:51 PM

#

Wait!

#

after compiling a hundred times and doing other things, it has randomly started showing up

#

📎 unknown.png

#

So Blackboard Key Selector variable types can be set in the task blueprint - and then linked to a blackboard key in the details rollout of the behaviour tree!

#

totally simple :V ha... ha...

#

potentially it wasn't showing up because I didn't have a Finish Execute node

bright rune Apr 14, 2019, 9:47 PM

#

Is "Get Known Perceived Actors" supposed to return actors that should have been "forgotten" already? Max age setting doesnt seem to do anything? Does Ai perception component work properly?

jaunty peak Apr 14, 2019, 9:59 PM

#

I'm kinda surprised at the lack of information about the AI stuff, it seems not very well thought out really.

#

@signal kindle glad you got there. Make sure you compile the tasks before looking at the BT. If you don't compile then the key bit won't show up in the BT for you select. You can use BB keys for tons of things.

cobalt granite Apr 15, 2019, 11:17 AM

#

I'm pretty new to the AI schebang, but surely I'm doing something wrong. It either, depending on the tree - rotates and stares directly at me and doesn't shoot, or just shoots without moving

📎 unknown.png

#

Anyone got any ideas? Or am I just a moron

jaunty peak Apr 15, 2019, 11:24 AM

#

try using a sequence not a selector on the set enemy chek node. also use aborts on the decorators for any changes to the key.

loud haven Apr 15, 2019, 3:43 PM

#

Anyone know what could be causing only one of my bots to listen to a command?

#

Feel like I've missed something obvious

cloud pulsar Apr 15, 2019, 3:54 PM

#

Does anyone know what could be causing this stuttering? https://streamable.com/ibrmy

Streamable

Desktop 2019.04.15 - 17.53.20.05 - Streamable

▶ Play video

#

They're pawns, simulating physics

#

Trying to do multiplayer

jaunty peak Apr 15, 2019, 4:57 PM

#

@loud haven only thing I can think of is that you're only checking one boys listen update, not all of them?

#

eg running an array through a loop for each one?

loud haven Apr 15, 2019, 5:02 PM

#

@jaunty peak - is there a way I can change that? Sorry I'm really bad with ai

toxic garden Apr 15, 2019, 7:33 PM

#

I'm trying to create a component that tells whatever Actor it's attached to to chase a nearby player. This isn't working. The Print never happens. Can anyone see what i'm doing wrong? I don't know for sure how to access the Sensing module on the Actor from the component.

📎 unknown.png

toxic garden Apr 15, 2019, 8:11 PM

#

Lol actually this works perfectly! I just forgot to attach the component to the actor...

jaunty peak Apr 15, 2019, 9:30 PM

#

Can I ask if there is a reason to using Pawn Sense over AI Perception Component? Am genuinely interested to know 😃

cinder spruce Apr 16, 2019, 10:15 AM

#

📎 unknown.png

#

📎 unknown.png

#

📎 unknown.png

#

if I spawn 1-2 of these everything is fine

#

but as soon as you spawn a couple, it lags out the game entirely

#

not ideal, as game is designed to have lotsof these

patent hornet Apr 16, 2019, 11:27 AM

#

pace it

#

you don't have to spawn all of them in a single frame

#

and SpawnActor is pricey

cinder spruce Apr 16, 2019, 11:30 AM

#

so do you mean add a delay?

#

what do you instead of spawn actor?

pine steeple Apr 16, 2019, 2:12 PM

#

yoiu need spawn actor

#

but delay them

#

every .1 second

#

or something

#

@jaunty peak pawn sensing is obsolete, use perception

jaunty peak Apr 16, 2019, 4:35 PM

#

Yarp, I know that that's why I was asking the other person. 😃

toxic garden Apr 16, 2019, 5:01 PM

#

@jaunty peak I was using Pawn Sensing because I'm a UE4 newb, and didn't realize it was different than AI Perception until I saw this very conversation. 😃

fallow hound Apr 16, 2019, 9:06 PM

#

I think pawn sensing is kept around for legacy projects

#

Perception is the latest and greatest

jaunty peak Apr 17, 2019, 10:16 AM

#

^ yeah, it should be... lol

modest wharf Apr 17, 2019, 2:30 PM

#

Anyone know how to rotate a Ai without snapping?

loud tundra Apr 17, 2019, 3:07 PM

#

snapping? Do you mean when the AI character turns?

hybrid cipher Apr 17, 2019, 9:12 PM

#

@modest wharf depends, you can set up rotation rates in character movement component, that's one way

quick eagle Apr 18, 2019, 8:49 AM

#

hey peeps, I'm working on turn based thingy and am wondering what is a good approach for AI. I have array IUpdatable objects(including ai), where I wanted to trigger update every turn, that would trigger the execution of BT path. But it looks like BT is heavily timer-oriented. Am I missing something? What is a good way to run BT execution path only when I need to? Thank you.

lyric flint Apr 18, 2019, 3:10 PM

#

@quick eagle how about if(!bMyTurn) return;

quick eagle Apr 18, 2019, 5:30 PM

#

@lyric flint that's what I'm going for rn. It doesn't seem really clean to me though...thought, maybe there are better ways.

gloomy vector Apr 19, 2019, 1:50 PM

#

Hey Guys How would I add some variation to the "AI Move to" paths? Every enemy runs the across the wide nav mesh path in exactly the same route to the target. I don't want them just running around randomly I've seen a bunch of tutorials on that.. they should try to get to the target but make it harder to predict their path.

hoary peak Apr 19, 2019, 4:51 PM

#

@gloomy vector Maybe not a great solution but couldn't you have them walk to the target location but with a bit of random variance and then when they are close enough they instead walk to the correct target location?

gloomy vector Apr 20, 2019, 1:45 AM

#

@hoary peak yes that is what I'm trying to do, how do I get the random variance working? I'm new to the AI nodes and have been watching a bunch of videos about the different Move To nodes and starting on behaviour trees. I can't find anything about adding random variation with a goal, only lots of tutorials using GetRandomReachablePointInRadius to run around aimlessly.

hoary peak Apr 20, 2019, 2:19 AM

#

I would get target location, split it and take X and Y and plug into random float in range and use as min values and add 0-200 or something and then use those values to create the vector again and use AI move To with that vector

#

I am about to go to sleep so I don't have time to boot up the engine at the moment but I think you might get what I mean, and then you get distance to actor and if it's < 200 or w/e you don't use the random floats in range but just the target location

#

@gloomy vector

deft sedge Apr 20, 2019, 3:54 AM

#

love playing with my little zombie ant farm

#

📎 unknown.png

#

AI plugin is going super well, I hope everyone likes it

gloomy vector Apr 20, 2019, 4:11 AM

#

@hoary peak the problem is that it's not a straight path, there are some corners, like a tower defence game. I tried projecting the GetRandomReachablePointInRadius out in front of the enemy so it would run in a forward direction with some randomness but then it doesn't try to get to the target.. I guess I could add a PointInRadius to place a waypoint target at each corner.

slow breach Apr 20, 2019, 10:28 AM

#

@hoary peak hey thanks, i randomly read your concept on how to handle that. Very noice thank you i needed a start for that as well 😛

hoary peak Apr 20, 2019, 10:35 AM

#

Glad I could help, I imagine it doesn't work great but maybe it's good enough 😛

slow breach Apr 20, 2019, 2:58 PM

#

better than a straight line 😛

#

location target > randomreachablepoint> with random float in range

#

boom

gloomy vector Apr 20, 2019, 4:23 PM

#

@slow breach could I see how you got it to work? please 🙂

slow breach Apr 20, 2019, 4:29 PM

#

https://gyazo.com/d530a0c66bdcbb69a974d035890abdc6

Gyazo

#

all i added was random float in range and get random naviable point, as i said above

#

@gloomy vector

gloomy vector Apr 20, 2019, 4:34 PM

#

@slow breach thank you! am I reading this correctly? it randomly picks a point and then moves there and then loops.. I was hoping to figure out how to add a bit of variation on the way to a target.

slow breach Apr 20, 2019, 4:36 PM

#

"how to add a bit of variation on the way to a target."

#

thats what it does

#

looping is up to u

#

but the target feeds into get random point

#

random float in range determines the range of how far around the target they can get a random point

#

then that feeds into the part telling them to move there

gloomy vector Apr 20, 2019, 4:40 PM

#

@slow breach I'll try so I can see it working..

slow breach Apr 20, 2019, 4:41 PM

#

good luck

fallow owl Apr 20, 2019, 9:03 PM

#

Simple question but is there a way to set the value of a cooldown decorator other than in the details panel in the editor, such as it being linked to a variable? I need a cooldown that randomly changes its length between uses

jaunty peak Apr 20, 2019, 9:36 PM

#

you could create a Task or Service to do that. Using BB keys or anything you like. Use a Random Float In Range node, and set your min and max values as you need to. Use that result as the time to wait.

#

That way you can set up the min max to be editable values , you could also add them as variable to the NPC letting you vary the amount easily between NPCs.

fallow owl Apr 20, 2019, 9:45 PM

#

Yes, you've explained how to get a random number but not how to actually set the cooldown's new value

#

Delays don't seem to work in tasks either

#

😔

jaunty peak Apr 20, 2019, 10:17 PM

#

use a Wait Blackboard Time task, and use the created wait time as the key value

#

so all you need is to run the 'create a random wait time' service on the selector or sequence the wait task comes from ( the loop start) then every time it will wait a different amount of time.

#

if you didn't want to do that a standard wait task allows you to set a variation on the wait. Thats simpler, but slightly less control.

#

A cooldown decorator should be used to fail a branch if it doesn't do something within a given time. So if all you're needing is to wait till something loops, is to use one of the wait tasks.

fallow owl Apr 20, 2019, 10:29 PM

#

@jaunty peak this looks like it might work, I'll test it when I get back, thanks 🙂

jaunty peak Apr 20, 2019, 10:34 PM

#

Hope it does, good luck!

#

Something like this for the random bit. https://imgur.com/xL4AyDC

Imgur

pure crest Apr 21, 2019, 8:16 AM

#

Guys i wanna make an animal AI

#

what type of bp class should it be?

tribal monolith Apr 21, 2019, 9:04 AM

#

@pure crest , there is a Animal Behavior asset by Coqui games. Even if not getting asset, take look at his very comprehensive youtube tutorials about it. You will get some ideas for sure.

pure crest Apr 21, 2019, 9:05 AM

#

Ok gotcha mate

#

Thanks for the insight

tribal monolith Apr 21, 2019, 9:06 AM

#

https://www.youtube.com/playlist?list=PLziQlhUd357htK27-82JgYEzhqAM7wsX9

YouTube

[WIP] Animal Behavior Kit - YouTube

dreamy surge Apr 21, 2019, 9:53 PM

#

is it possible to do the game debugger while your in the actual game and not in simulation? so far it only works in simulation, pressing ' does not bring it up while in game

minor wolf Apr 21, 2019, 10:21 PM

#

hey y'all, has anyone tried making a turn-based AI? I wonder how to approach one for a card game

upper zealot Apr 22, 2019, 1:37 AM

#

hey @minor wolf , I worked as architect in one game some years ago. Not Unreal but I think it doesn't matter. We made a server in Java that managed the logic and the clients were just visual interfaces (as expected).
The AI was tons of utility and some level of goal based, and all the cards were composed from granular skills that could be combined to create a full card logic

viscid oasis Apr 22, 2019, 2:08 AM

#

📎 unknown.png

#

Any help with this - I can't seem to get the second child firing. Is it because the EQS returns a false no matter what?

viscid oasis Apr 22, 2019, 2:25 AM

#

I had this working fine before, not sure wtf happened.

viscid oasis Apr 22, 2019, 4:57 AM

#

Ah, it's working - it just wasn't lighting up the nodes cause they were returning false I guess.

lyric flint Apr 22, 2019, 7:39 AM

#

anyone know how to show the AI path that it's going to take?

lyric flint Apr 22, 2019, 9:07 AM

#

📎 unknown.png

#

got it

#

📎 unknown.png

simple ivy Apr 22, 2019, 12:04 PM

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You guys ever run into the issue when your NavMesh stopped showing green / red and working?

It seems to be a common problem according to Google. I have tried to rebuild and hit P, but nothing is working

lyric flint Apr 22, 2019, 2:30 PM

#

Hi guys is it normal for the visual preview of the pawn sensing to be a lot bigger than it actually is? As you can see my character should trigger the enemy by standing in the green as soon as he jumps the gap but I can only get it to work by deliberately jumping really close to the enemy.

📎 unknown.png

livid beacon Apr 22, 2019, 7:07 PM

#

Newb question: I created a game using the top-down template and made an enemy character blueprint. When I place an enemy in the level, and play, and I click for the player to move to the other side of the enemy, the player tries to run through the enemy rather than going around. It tends to get stuck when it runs into the enemy, an keeps trying to run through until the player bounces around the edge of the enemy. The player movement seems to have no problem choosing a path to go around the cubes in the default level, but it can't seem to choose a path around the enemy pawn without just bashing into it until it bumps its way around. I have compared the collision settings in the enemy character mesh to the collision settings in the Cube mesh, and making those settings identical doesn't seem to fix the problem. What am i missing? Thanks!

unborn jungle Apr 22, 2019, 7:43 PM

#

Any reason why the AI controller that auto possesses characters when spawned is also able to possess and run on the character that I'm controlling as the player?

#

I have the AI controller running logic that makes them talk to the player character that they possess, and jump

#

It's working nicely but I also jump too

#

Even though I've possessed my character with a player controller

#

Do they both exist and both control the character, and should I just manually spawn AI controllers for non human characters?

jaunty peak Apr 22, 2019, 8:56 PM

#

there is part of me giggling at the thought of the AI making the player jump.

#

@livid beacon in your NPC BP look at the details panel, scroll down to Pawn. There should be an option for 'Can Affect Navigation Generation' select that if not already and see if that helps.

#

or any character that uses the nav mesh.

livid beacon Apr 22, 2019, 9:26 PM

#

Nagual, that did it! Thank you! It's a bit confusing because there are may navigation-related settings under the Mesh component, so I was focused on those. It hadn't occurred to me to look at the Pawn settings in the class itself. Thank you again!

jaunty peak Apr 22, 2019, 11:16 PM

#

You're welcome. Although to be honest neither did I, but I poked around n stuff. Glad to be of help. 😃

lyric flint Apr 23, 2019, 6:54 AM

#

@simple ivy unknown if your question was ever answered but hitting build actually remakes the navmesh, oddly it doesn't update unless you rebuild sometimes

supple trout Apr 23, 2019, 10:02 AM

#

Ok, so I am probably being a dumb dumb, but I am having problems getting my character to be controlled by the ai controller. I made a blackboard and a behaviour tree that has three nodes: Custom find and set target location, moveTo and wait. Inside the set target location custom task node I added print statements, but nothing is happening.

I also set the ai controller class to my custom controller that on BeginPlay executes the behaviour tree.

I have set down a nav mesh that is visible when I press P.

Am I missing anything?

lyric flint Apr 23, 2019, 3:25 PM

#

Hi, im really new to UE4. Got 1 problem with the npc and need help to do a side of the npc. The problem is that the npc can see the player across the map, and i have the radius to only 20 ( http://prntscr.com/nfu3yl ) and what i want is that the npc when he doesnt see the player when chasing returns to the place that it was, but that stays turned to the way that it was before.

Lightshot

Screenshot

Captured with Lightshot

#

im sorry that the last part is a bit confusing, i hope you understand

jaunty peak Apr 23, 2019, 3:56 PM

#

@lyric flint Check these out. https://www.youtube.com/playlist?list=PL4G2bSPE_8ukuajpXPlAE47Yez7EAyKMu

YouTube

AI - YouTube

#

btw 20 is not really useful unless your actors are tiny. 😄

#

@supple trout ^ they might be helpful.

lyric flint Apr 23, 2019, 4:03 PM

#

well, the type of enemies taht im making only chase the player, when the player is really close to him

#

@jaunty peak im actually watching that tutorials already 😄 , but thank you

jaunty peak Apr 23, 2019, 4:08 PM

#

If you need to 'remember' which way you were facing, you could get the rotation and save it as a variable. If you mean turn to face where the NPC has come from - like still keeping an eye out for the player - then you can get the look at rotation from the last player location (if you're using the above - TargetLocation) .

lyric flint Apr 23, 2019, 4:11 PM

#

oh thank you, can multiple npcs share the same Behaviour Tree?

jaunty peak Apr 23, 2019, 4:27 PM

#

yes 😃

lyric flint Apr 23, 2019, 5:21 PM

#

@lyric flint i've got a system like the one you're trying to make

#

@lyric flint im trying to make enemy statues taht guard the entrance of huge mansion

#

of a *

signal kindle Apr 23, 2019, 6:32 PM

#

😒

#

Edit: nevermind found another mistake causing an issue.

stark zealot Apr 23, 2019, 7:46 PM

#

So I need some general advice. I made some zombie enemies for a horde based game. My issue is that you can run past a horde and all of them hit you at once and you die instantly. What is a good way to keep the zombies attacks strong but not just instakill you when you get next to a few zombie? How do other games like Call of Duty Zombies, Left 4 dead, Killing Floor, etc. do it? Do they have a small cooldown where the player can't take a ton of damage while being damaged or something? My zombies deal 45 damage and players have 100 health so it should take 2 to 3 hits to kill a player based on his health. But I'm taking 400 damage when I run past a horde all in one blow.

jaunty peak Apr 23, 2019, 7:59 PM

#

use less zombies... 😉 lol

stark zealot Apr 23, 2019, 8:08 PM

#

hahahaha no its not that. 2 zombies can take you out in one blow instantly. Maybe I should change their movement and attacking. Make make a delay between running and attacking. I think I remember Cod zombies stop running, then swing at you. Mine just straight sprint and swing like a madman

#

also has anyone had the issue where the NavMeshVolume messes up when you open your project? Mine was messed up when I opened my project today. I had to move it just a tad then it showed green again and started working.

signal kindle Apr 23, 2019, 8:52 PM

#

so the zombies could attack with a random variance...

#

so they don't all hit at once

#

but really you've answered your own question. You have many zombies that all instantly do a 3rd of the players health as damage

#

if its normal for many zombies to attack the player, then they should probably deal less damage

#

or you could have two different attacks for if the zombie is alone, where the zombie AI checks if any other zombies are within a radius to it before attacking

#

or a token system, zombies run at the player, but only 2 are allowed to attack. each zombie ups a counter before it attacks, if the counter is at 2, they can't attack

#

if a zombie attacks, they wait, then lower the counter

#

and wait again before trying to attack

#

like the zombies are taking a limited number of tokens, and can't attack without a token

jaunty peak Apr 23, 2019, 9:11 PM

#

or possibly make the collision for the attacks be very precise. So you'll get hit less.. Or use a small random time to delay each attack.

simple ivy Apr 23, 2019, 11:40 PM

#

Hey @lyric flint - thanks for responding! No, no one answered my question and I still have the issue. I see on AnswerHub there are a lot of people with the issue but they all resolve it by rebuilding - which isn't working for me.

I did find another guy who has the same issue that can't solve it either.... I'm thinking it must be the Engine's issue and there's nothing I can do on my side, but I hope I am wrong!

lyric flint Apr 24, 2019, 1:19 AM

#

@simple ivy is there any options you've tried turning on / off?

simple ivy Apr 24, 2019, 8:50 AM

#

@lyric flint I have tried turning view navigation on and off, I have tried rebuilding, I have tried deleting the navmesh and recast navmesh and putting in new ones, I have tried creating a new level and putting it in, I have tried moving the mesh around (where the editor will notify that it is rebuilding the mesh), I have changed the navigation mesh in project settings to dynamic instead of static and I have tried changing the numbers within project settings concerning navigation - nothing worked thus far.

I have also made a brand new project and dragged the nav mesh bounds in, and that worked. But I really don't want to have to start from scratch just for the damn nav mesh haha

lyric flint Apr 24, 2019, 10:38 AM

#

heyo people, is there any way to stop the navmesh hitting a wall? buffering it off it?

jaunty peak Apr 24, 2019, 12:49 PM

#

Nav mesh blocking volume?

#

Or possibly using EQS

supple trout Apr 24, 2019, 12:50 PM

#

How the fuck do blackboard key selectors work?! How do I tell it to access the Actor reference?

#

Target Actor is the name of the blackboard entry

jaunty peak Apr 24, 2019, 12:51 PM

#

you need to set your BB keys during begin play

#

or set them in any where, really.

supple trout Apr 24, 2019, 12:52 PM

#

The values are set using Literal variables, but when I need the reference in a custom task the thing fails.

jaunty peak Apr 24, 2019, 12:53 PM

#

You'd need to take screenshots of your graphs etc. Hard to know what's going on without them

#

I like these vids on AI, if you've not saw them before maybe give them a shot. Covers all the stuff for that sort of thing. https://www.youtube.com/playlist?list=PL4G2bSPE_8ukuajpXPlAE47Yez7EAyKMu

YouTube

AI - YouTube

supple trout Apr 24, 2019, 12:55 PM

#

Installing a imgpush service now. Give me a sec

jaunty peak Apr 24, 2019, 12:56 PM

#

np

supple trout Apr 24, 2019, 12:58 PM

#

https://puu.sh/DjbrB/9a946b6c15.png

#

The node that is blocked is the custom task that tries to access the actor.

#

https://puu.sh/DjbtF/21912b5efc.png

#

Here I set the character at Begin Play

#

https://puu.sh/DjbuA/98927df7e9.png

#

The custom task

jaunty peak Apr 24, 2019, 1:05 PM

#

Hmm, in the middle pic. You're not using Set Blackboard Value as Object. I think that may be the issue or not lol

#

Get Blackboard Value as and Set Blackboard Value as, are the ones you need to use to interact with BB keys

supple trout Apr 24, 2019, 1:07 PM

#

Oh....

#

It was muuuuch easier. I just had to expose the key variable to be able to set it in the tree itself....

#

Silly me.

#

Thanks!

jaunty peak Apr 24, 2019, 1:09 PM

#

you're welcome 😃

loud haven Apr 24, 2019, 3:09 PM

#

Anyone know why my AI only move to the characters location and no where else? I even put in the exact coordinates of where the player is standing and they don't budge. Have I missed something? This was all working fine this morning :/

jaunty peak Apr 24, 2019, 3:36 PM

#

pics?

loud haven Apr 24, 2019, 3:39 PM

#

📎 unknown.png

#

If that makes sense?

#

It feels like I clicked a button that said "Break AI" - I haven't changed any blueprint stuff really. Even changing it back does nothing

jaunty peak Apr 24, 2019, 3:44 PM

#

I can only guess that Flag Location is not set correctly?

loud haven Apr 24, 2019, 3:44 PM

#

I put a print to it and it comes out correctly

#

I set the location manually and it doesn't do anything either

jaunty peak Apr 24, 2019, 3:49 PM

#

So if the Flag Location is valid then when the Graph is completes the TargetLocation BB Key is correctly set. Then something must be changing the value of it.

loud haven Apr 24, 2019, 3:51 PM

#

Maybe? Although when I watch this whilst the game is running it never changes.

📎 unknown.png

jaunty peak Apr 24, 2019, 3:55 PM

#

Where do you set the Flag Location?

#

The first pic you showed is the MoveToPoint task, yeah?

loud haven Apr 24, 2019, 3:55 PM

#

Yeah

#

Flag Location is set in the pawn itself

jaunty peak Apr 24, 2019, 4:00 PM

#

Could you show me how you've done that, please?

loud haven Apr 24, 2019, 4:01 PM

#

📎 unknown.png

#

This is where things get weird, the sound comes from the flag but also the player because that's the only way the AI will hear it?

jaunty peak Apr 24, 2019, 4:03 PM

#

You know Pawn Sensing is depreciated now?

loud haven Apr 24, 2019, 4:04 PM

#

Oh really?

jaunty peak Apr 24, 2019, 4:04 PM

#

AI Perception is it's successor.

#

works in a similar way.

loud haven Apr 24, 2019, 4:06 PM

#

Okay, what would you suggest I do? The pawn sensing was working fine this morning, I'm not sure switching would change anything.

jaunty peak Apr 24, 2019, 4:11 PM

#

hmm.. lol give me a minute, am just following logic paths just now.

#

So if I'm reading this right this is what is happening:

The NPC hears a noise. It sets the BB Key Sound Location to the vector given by the Exec node, the same vector is given to the variable Flag Location. Your MoveToPoint task sets the TargetLocation to the vector in Flag Location. The NPC then tries to move there.

loud haven Apr 24, 2019, 4:18 PM

#

Yes, I think so yeah

jaunty peak Apr 24, 2019, 4:18 PM

#

The first thing that comes to mind is that you might consider getting a random nav point from the location first, as that guarantees(ish) that the NPC can get to it.

#

So if all that is right, the Flag Location will set to the players location. as it's getting that data from the noise event.

loud haven Apr 24, 2019, 4:20 PM

#

Okay, where should I put that random nav node? In the MoveToPoint?

jaunty peak Apr 24, 2019, 4:23 PM

#

Sure, just at before you set the BB key. Take the Flag Location that you have and use a Get Random Nav thingy in radius node. use the result of that as your key value.

#

If that doesn't do anything, I'm not sure I can help, I don't have any experience with Pawn Sensing. 😦

loud haven Apr 24, 2019, 4:25 PM

#

They're moving!!!!

jaunty peak Apr 24, 2019, 4:25 PM

#

lol

#

Moving in the right way or just moving?

loud haven Apr 24, 2019, 4:28 PM

#

They're moving, which is a start

#

It takes some time but they eventually kind of get to where I want them to go. I'm still not sure what's stopping them from just walking straight to the location.

jaunty peak Apr 24, 2019, 4:31 PM

#

They are meant to go to the place where the noise was made?

loud haven Apr 24, 2019, 4:31 PM

#

Yeah

jaunty peak Apr 24, 2019, 4:36 PM

#

Going by the BT, if the NPC does not hear anything (and Enemy is not set) then it will not have a Flag Location vector to use, unless it gets set somewhere else as well?

loud haven Apr 24, 2019, 4:37 PM

#

I've made it so that they all ways hear where it is, so in theory it should always be set?

jaunty peak Apr 24, 2019, 4:38 PM

#

So the player is making a noise all the time?

loud haven Apr 24, 2019, 4:38 PM

#

Essentially yeah

#

This is why I'm confused, they should always be able to move to the point

jaunty peak Apr 24, 2019, 4:39 PM

#

2 tics

#

If the goal of it is just to always get the NPCs to run at the player, why not use a Simple Move to Location and use your Target Location as it's goal? That way they will always follow the player around until Enemy is set.

#

Anyway, afraid I can't be much more help I don't think.

loud haven Apr 24, 2019, 4:44 PM

#

Oh yeah, I'll have a look at that! Thank you so much for all your help, it's been really useful!

minor wolf Apr 24, 2019, 8:06 PM

#

hey y'all, is there a way to stop executing a behavior tree once it finishes?

#

or should I make a custom task for it

jaunty peak Apr 24, 2019, 10:17 PM

#

Why do you want to stop it?

warm cedar Apr 25, 2019, 2:25 AM

#

@minor wolf I think you'll need a task with: controller > Brain Component > Stop Logic

#

Question...
There's probably no easy way to "Move To" vertically, without programming the vertical movement yourself? ...in cases where AI is capable of flying when needed.

pine steeple Apr 25, 2019, 11:26 AM

#

not really

#

there is a flying ai plugin

lyric flint Apr 25, 2019, 12:33 PM

#

how do i put that blue arrow, on the head of the orc? (im new with UE4)

#

http://prntscr.com/ngq38u

Lightshot

Screenshot

Captured with Lightshot

hidden beacon Apr 25, 2019, 2:29 PM

#

i love the ue4 Built-In AI.
https://youtu.be/ykM944aqmf0

YouTube

zomdiax5

Test Stucznej Inteligencji

Poprsotu ktrótki test pokazujący czy SI może sie przemieszczać po świecie.

▶ Play video

haughty apex Apr 25, 2019, 3:46 PM

#

Hello, I have a problem when trying to rotate the AI towards the player as it flees towards another location

📎 unknown.png

#

The rotation simply doesn't work, the AI rotates in the direction of its movement

#

I have checked every instruction from this thread's answer :
https://answers.unrealengine.com/questions/533200/behavior-trees-rotate-to-face-bb-entry-and-moveto.html

#

It's a programming test, and the conditions were all met beforehand by the test's maker

#

in the AI's character

#

What am I missing ?

jaunty peak Apr 25, 2019, 4:20 PM

#

Thats a good question, I've had issues with Rotate to face BB entry as well. It simply doesn't seem to do it, or sometimes it does, or sometimes it hangs.

jaunty peak Apr 25, 2019, 6:16 PM

#

Anyone know what would cause the Root node in a BT to pause? The BT paths fire, but there is always a pause at the root. This results in the NPC standing idle for a couple of seconds then doing the correct Behaviour.

patent hornet Apr 25, 2019, 6:49 PM

#

You can just use contriller rotation and set focus

supple sigil Apr 25, 2019, 10:09 PM

#

@haughty apex You have the rotate task before the move.
It wont execute the nodes after the move until it has reached its destination.

#

with the way you have it there it will execute the rotate after ir reaches its destination

jaunty peak Apr 25, 2019, 10:33 PM

#

if you do it that way, doesn't it end up facing the player then moves to a new location where it will be rotated in orientation to the direction it was last moving?

supple sigil Apr 25, 2019, 10:43 PM

#

if he is using focus then it wont stop facing the focus target.

#

but from what I can tell the rotate node needs to be before the move node. because it will just move then attempt to rotate

supple sigil Apr 25, 2019, 11:20 PM

#

I myself have a question.
I have a custom door BP that uses an interface to open/close it. I have an AI that I would also like to be able to use the door. I added the interface to the AI and I don't know how to approach setting up how to make the AI use the door whilst trying to get to the other side. I tried a opening when the AI enters a zone but with that then the AI will open doors as it walks by them and I don't want that. I don't know how to approach this and I'd really appreciate some help with this!
Please @ me if you could help
~Thank you in advance! < 3

supple sigil Apr 26, 2019, 2:58 AM

#

Update: I used a nav link proxy and linked it to each side of the door. Each time the ai activates it. It opens a assigned door but the ai will just sit there not doing anything else after activating the nav link proxy.

haughty apex Apr 26, 2019, 8:59 AM

#

Okay I didn't know about the existence of Set Focus

#

Dammit

#

It works, thanks a lot

lyric flint Apr 26, 2019, 9:47 AM

#

@supple sigil you can turn off the door disturbing the navmesh, currently it probably is but it's worth either doing that or making it create navmesh on the go

jaunty peak Apr 26, 2019, 2:44 PM

#

Anyone know what might be cause is the root node to 'pause' like this: https://youtu.be/0UWc9CTr-Z8

YouTube

Mark Brown

BT Pausing.

▶ Play video

jaunty peak Apr 26, 2019, 5:03 PM

#

https://youtu.be/t03Gt69v9kc

YouTube

Mark Brown

AI Debug output. BT stops firing every couple of seconds.

▶ Play video

jaunty peak Apr 26, 2019, 5:27 PM

#

Solved. I'm an idiot.

supple sigil Apr 26, 2019, 6:01 PM

#

@lyric flint I got the nav link proxy to open the door and the ai is capable of walking through the door. It's just when the ai activates the smart link it won't move anymore.

pseudo oasis Apr 26, 2019, 6:18 PM

#

How can you set GenericTeam in Blueprint?

lyric flint Apr 27, 2019, 1:09 AM

#

@supple sigil

Guessing you've broken the ai loop

slow breach Apr 27, 2019, 12:52 PM

#

@supple sigil if your door opens on a timeline, off the finished part(door is open) tell ai to move

#

Pic would help tho

pseudo oasis Apr 27, 2019, 1:33 PM

#

I am currently using the AIPerception sense but enemies, friendlies,... is not working. Even though I change the TeamID in the AIcontrollers, they all stay neutral to eachother 😕

pine steeple Apr 27, 2019, 1:39 PM

#

that system is odd

#

the TeamID stuff

#

we disabled it and rolled our own system

#

and just ticked all the boxes

#

so perception system just didnt use that

supple sigil Apr 27, 2019, 1:55 PM

#

@slow breach https://www.youtube.com/watch?v=Xdw66Vx5QQs

YouTube

TuXsOrDs

UE4 AI wont move after activating Nav link

I made a nav link so my AI can open doors but the AI wont move after activating it.

▶ Play video

slow breach Apr 27, 2019, 2:12 PM

#

add a check if at nav proxy and if door is open, then move through the door

#

it looks like the issue is the navy proxy is just telling him to continuously go to that even after the door is open @supple sigil

odd inlet Apr 27, 2019, 2:26 PM

#

have there been any changes to how navmesh works in recent engine versions? I no longer get any RecastNavMesh in my level

#

should that no longer exist?

supple sigil Apr 27, 2019, 2:37 PM

#

@slow breach I added a check in the nav link proxy to see if the door is open and if its not it will open it. but the same thing happens. he just sits there.

slow breach Apr 27, 2019, 2:40 PM

#

does it print that it's opened?

supple sigil Apr 27, 2019, 2:43 PM

#

I had when the smart link if activated it checks if the door is open and if it is it dosnt do anything but if it isnt open then it opens the door but still wont move through it.

sharp mist Apr 27, 2019, 9:28 PM

#

@sleek anvil Yeah I have one it's normal jump animation, i Like want to make the ai jump through window when its like the shortest path , lemme show if i find screenshot

pine steeple Apr 27, 2019, 9:28 PM

#

i know what you want

#

and i know what you need

#

i also know how to achieve it

sharp mist Apr 27, 2019, 9:28 PM

#

thank go d

#

;;

#

Thank god again

pine steeple Apr 27, 2019, 9:29 PM

#

ill pm you a gif

#

tell me if its what you are after

sharp mist Apr 27, 2019, 9:29 PM

#

i will for sure

pine steeple Apr 27, 2019, 9:29 PM

#

once my editor loads lol

sharp mist Apr 27, 2019, 9:29 PM

#

lol

pine steeple Apr 27, 2019, 9:29 PM

#

my pc is no slouch

sharp mist Apr 27, 2019, 9:29 PM

#

Same here

pine steeple Apr 27, 2019, 9:29 PM

#

this project is huge

sharp mist Apr 27, 2019, 9:30 PM

#

You know game called hello neighbor?

pine steeple Apr 27, 2019, 9:30 PM

#

seen it, never played it

#

vr game right

sharp mist Apr 27, 2019, 9:30 PM

#

no? xD

#

Its not on vr

pine steeple Apr 27, 2019, 9:30 PM

#

i thought it was

#

but ive seen it pasted in places

#

never looked into it

sharp mist Apr 27, 2019, 9:30 PM

#

Im like doing a remake of it but with old artstyle, and well...better ai.

#

I already have like, 4 slot inventory and other things, i only want to get some help with ai

pine steeple Apr 27, 2019, 9:31 PM

#

oh its like a cartoony horror game

sharp mist Apr 27, 2019, 9:31 PM

#

yeye but its the new artstyle

pine steeple Apr 27, 2019, 9:32 PM

#

https://gyazo.com/ad1f9cde8971cf4d042f7ef482b62104

Gyazo

#

bear with me a sec lol

sharp mist Apr 27, 2019, 9:32 PM

#

this is old artstyle https://www.youtube.com/watch?v=TKLx5rhpS2k

YouTube

tinyBuildGAMES

Hello Neighbor Announcement Trailer

Download the Pre-Alpha - http://HelloNeighborGame.com Wishlist on Steam - http://store.steampowered.com/app/521890 Hello Neighbor is a Stealth Horror game wh...

▶ Play video

pine steeple Apr 27, 2019, 9:42 PM

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ah

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sorry got sidetracked

lyric flint Apr 28, 2019, 5:49 PM

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hi, im watching a tutorial to put a npc to attack the player. Im using the "infinity blade adversaries", the greater spider attack animation A, and the spider. But the problem is that it doesnt appear the "Anim Slot Manager" http://prntscr.com/nhywu4 , in the Greater spider animation A in the "Animation Sequence" and in the "Animation Montage". Doesnt anyone know what the problem could be, because i cant find it.

Lightshot

Screenshot

Captured with Lightshot

fallow stone Apr 28, 2019, 6:46 PM

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can anyone suggest good ai tutorials?

patent hornet Apr 28, 2019, 6:58 PM

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check pinned messages on this channel

sharp mist Apr 28, 2019, 7:10 PM

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ok guys so uhh i actually have little problem with my ai hopping through window when he approaches the smarlink nothing is happening

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📎 unknown.png

fallow stone Apr 28, 2019, 11:31 PM

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https://www.youtube.com/watch?v=rVC_0rimFJY

YouTube

Totally Unreal

Unreal Engine 4 Tutorial : AI Behaviour Tree #1 (Chase & Roam Updated)

Discord Server : https://discord.gg/ZY26P6r

▶ Play video

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this is cool

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watch out, its quite fast to track so be sure to check it again if something doesnt work

lyric flint Apr 29, 2019, 7:32 AM

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📎 unknown.png

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so i figured out a way to make the AI move away from the wall when pathfinding

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get forward vector of next point, get larger angle and div 2 then add point out in new direction instead X distance from the smaller angle

spice island Apr 30, 2019, 12:48 PM

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how to prevent AI stacking themselves in corner? Basic character BP with RVOAvoidance enabled.

📎 Capture.PNG

spice island Apr 30, 2019, 1:52 PM

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well what I have figured out Acceptance Radius should be at least x2 size of a collision capsule radius and tweaked Avoidance Weight to 0.8 (not sure if it does anything)

sterile escarp Apr 30, 2019, 3:19 PM

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Hey quick question about blackboards

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I have a blackboard based value on a sequence

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Can See Player is not set (Aborts both)

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Does it abort if "CanSeePlayer" is set or is not set?

jaunty peak Apr 30, 2019, 6:21 PM

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yarp

lyric flint Apr 30, 2019, 6:56 PM

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@sterile escarp if you have 2 sequence with "CanSeePlayer", it aborts on the one that is not set, and goes immeaditelly to the other

lyric flint May 1, 2019, 1:26 PM

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can someone pls help me. Im trying to make a npc with health and when the player attacks him, he looses health. Ive seen many tutorials but im simply not getting what i want...

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i*

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i got a meele weapon with collision on the blade

molten tusk May 1, 2019, 6:12 PM

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I have a question i cant figure out. i just completed my first AI patrolling NPCs and they work, i checked blackboard while the game is running and the nodes are firing. But i do not see them moving at a distance until i get close to them. After i get close, they update and i can see them moving around. Only at a close distance though. I cannot find the correct variable or information online to increase the distance to see other actors at a distance moving. Any ideas?

molten tusk May 1, 2019, 6:52 PM

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nevermind fixed it. The net cul distance squared on the AI Controller was shorter than the net cul distance on the character. I matched them up to be the same so the AI engages at the same distances of viewing them.

fleet meteor May 1, 2019, 10:49 PM

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How does UAIPerceptionComponent compare to just doing (sphere) traces and parsing the results? In my case, I just need distance based stuff.

simple ivy May 2, 2019, 12:05 AM

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Anyone ever had the common issue of AI mesh not flowing through doors? So that the AI can't walk through open doors? I think I'm missing something basic...

pine steeple May 2, 2019, 1:24 AM

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closed doors should have some sort of modifier

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when door is closed, set nav area to null

stiff gale May 2, 2019, 3:03 AM

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Is there any tutorials on how to create AI that can either ride a horse or car or bike or plane? For example, it can walk to a car then take the car to its destination then get off.

patent hornet May 2, 2019, 3:05 AM

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im most cases, especially for AI its easier to separate that

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in your example, your AICharacter walks to a car, which is a Pawn with its own controller and BT

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calls a function on the Car, which amongst other things, sets the destination in Car's BB, plays the animation of getting into a car...

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as soon as that (in this case Animation Montage) finishes, the Car's BT runs, and AICharacter is basically inactive until the time to get out

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you really don't want to write a single AIController that can handle walking around, flying a plane or riding a goat

stiff gale May 2, 2019, 3:12 AM

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lol riding a goat

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Yea I thought about what you just told me. I was wondering if there're any articles or video tutorials that shows you. My current AI systems are something that bought from the marketplace. So I might create a new AI system only for that specific task.

limber tiger May 2, 2019, 4:27 AM

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Does anyone know of any good tutorials that goes into setting up multiple AI perception stimulus in Blueprint?
At the moment I've got both sight and sound stimulus on my AI but I ran into the issue where it weights both stimulus evenly. Meaning, if my AI is focused on playerA and then playerB shoots, it updates playerB as the new target and leaves playerA and runs to playerB... this causes a ping-pong effect.

I'm sure there's a million different ways it could be solved, I'm kinda looking for the most recommended approach in weighting different AI senses. I did notice there's a "Dominant Sense" function but I can't find any info on this.

patent hornet May 2, 2019, 6:25 AM

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@limber tiger there was a live training stream that had "Advanced" in the name that was okay

limber tiger May 2, 2019, 6:26 AM

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Cool thanks, will have a look

keen hinge May 2, 2019, 7:22 AM

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is it possible to restrict navigation based on materials on level?

wise ridge May 2, 2019, 10:28 AM

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How can I make my AI fly towards the player?

limber tiger May 2, 2019, 11:17 AM

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Zlo just watched the 2 hour stream O_O haha, was good information, but its using EQS which I'm not entirely sure on, and they only used it for sight, not multiple senses.
Its still marked as "experimental" after several years which makes me kinda want to avoid investing in it. It seemed buggy and the params for it were changed around since and I couldn't get the same result as what they were getting so I kinda just had to stop following along and just watch.
Will keep searching though 😃 If you think of any others lemme know!

patent hornet May 2, 2019, 11:27 AM

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EQS works just fine

thorny crest May 2, 2019, 12:44 PM

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im trying to make a character swapping mechanic and make it so that the rest of the party follow whoever is possessed but when i switch from one character to the other, the previous character stops moving

📎 2019-05-02_13-42-41.mp4

runic token May 2, 2019, 12:47 PM

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are you possessing that character with an AI Controller?

thorny crest May 2, 2019, 12:47 PM

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yeah

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📎 unknown.png

runic token May 2, 2019, 12:49 PM

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that has the other three perform move to, not the first one

thorny crest May 2, 2019, 12:50 PM

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nevermind you meant the actual possession

📎 unknown.png

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nah its 4 of the same script but with the 'move to' different depending on whose possesed

📎 unknown.png

wintry compass May 2, 2019, 12:51 PM

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I don't think that you are possessing the character when you switch

runic token May 2, 2019, 12:51 PM

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you have the player posses the character, but do you have the old character get possessed by an AI controller?

thorny crest May 2, 2019, 12:51 PM

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ah no i dont

pine steeple May 2, 2019, 2:12 PM

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also DRY!

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you are repeating a lot of stuff

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encapsulate into a function

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would make your blueprint nice to read

raven leaf May 2, 2019, 3:09 PM

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Are there any good behaviour tree examples from epic games that I should look at to try and improve my behaviour tree knowledge?

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Done some tutorials but I'd now like to look at some examples

jaunty peak May 2, 2019, 5:04 PM

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I guess that really depends on what type of things you are needing for your AI @raven leaf

raven leaf May 2, 2019, 5:05 PM

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Ideally I'm looking for a behaviour tree that has all kinds of aggressive/defensive/utility behaviour so I can see the standard for how each node works

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Right now I'm using decorators/services/tasks etc but I'm not sure if what I'm doing is 100% the correct way, so I'd like to have some examples to keep me on the right track

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This is what I'm using so far to build an object in-game. I'm not sure if using a conditional loop is correct as I cant change the looping rate time

📎 unknown.png

jaunty peak May 2, 2019, 5:09 PM

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For controlling how fastyou loop, you could use a wait or a wait BB time node?

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so instead of the increase progress coming from the Build node, add a sequence instead and you'd be able to refine how your loop works

raven leaf May 2, 2019, 5:13 PM

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Right, so a sequence with an increase + wait

jaunty peak May 2, 2019, 5:15 PM

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thats one way to do it. the wait just pause the AI, so may not be what you want.

raven leaf May 2, 2019, 5:19 PM

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What about using a service to increase the timer? that way I can control the rate

jaunty peak May 2, 2019, 5:19 PM

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the Wait BB time node ( sorry can't remember the exact name) get's it's wait time from a BB key, which you can set to whatever you like or even make it variable.

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Can I clarify, the increase progress node. what is it exactly you are wanting it to do?

raven leaf May 2, 2019, 5:22 PM

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Okay so a little backstory may explain things better for what I'm trying to do here-
I'm making an RTS game, and in this part of the BT, when the player clicks make sandbags here, the AI receives the emplacement object, finds the location, moves to it, does a building animation whilst waiting for the progress to go up, then the sandbags appear as the built object

jaunty peak May 2, 2019, 5:24 PM

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and the loop bit is just to repeat the animation and increment the progress?

raven leaf May 2, 2019, 5:24 PM

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Just to increment the progress, yeah

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I'll deal with animations later

jaunty peak May 2, 2019, 5:25 PM

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okay. So your NPC starts to build and it progress increases by x amount. You want it to continue progressing until it's complete?

raven leaf May 2, 2019, 5:28 PM

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Yeah

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📎 unknown.png

jaunty peak May 2, 2019, 5:28 PM

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give me a mo, just trying to sort out the logic in my head

raven leaf May 2, 2019, 5:28 PM

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This is increasing the progress

jaunty peak May 2, 2019, 5:33 PM

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2 secs just opening UE to check something

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📎 Capture.PNG

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Something like this, the build will continue to happen until it's complete, I've used a Wait BB time, as you can set this anywhere you like.

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It gives much more control than a basic wait.

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Inside your increase node, when the progress >= set the IsComplete to true.

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or something similar.

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By using the BB decorator you can control when it leaves any lower paths.

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Unless I've misunderstood your goal. Which I admit could be the case, if so sorry 😃

raven leaf May 2, 2019, 5:54 PM

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ah thanks man, I will try it out!

jaunty peak May 2, 2019, 5:57 PM

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@raven leaf If you're still stuck later on, send me a message and I'll try to help if you like.

raven leaf May 2, 2019, 5:57 PM

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Thanks man, I'm putting it in now but I'm not sure exactly how to set the decorator perameters up

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📎 unknown.png

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📎 unknown.png

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thats the decorator for increase progress loop

jaunty peak May 2, 2019, 6:06 PM

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Change the Increase Progress Loop node to a selector. (And remove the decorator from that) .Then if you copy the layout from my example above, you'd have a sequence node. On that new node your BB decorator will be < [build complete amount]. That will then loop everything under it until progress is not less than [X] if you need anything specific to happen after it's built have another sequence from the same Selector node (with a BB decorator checking progress => [X] and add the stuff for that, there.

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That should then result in your build nodes looping until progress is complete, and then do something once it is.

raven leaf May 2, 2019, 6:24 PM

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Thanks for the help @jaunty peak, I gotta head out now but will try and finish this up tomorrow.

jaunty peak May 2, 2019, 6:24 PM

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NP, take it easy.

raven leaf May 2, 2019, 6:26 PM

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Looks like this works, thanks for all your help. 😃

📎 unknown.png

jaunty peak May 2, 2019, 6:29 PM

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😃 😃

lean cliff May 3, 2019, 1:44 PM

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Hey all, I'm currently working on a mechanic where you press a button and most the game world stops. As part of this, I've got several in world AI who have an interface with functions that react to this mechanic.

As part of this mechanic, they all set their custom time dilation to 0.0f until the mechanic ends and it goes back to whatever they were on prior to it starting.

However, their behaviour tree's are still running (I can tell because they are frozen midwalk for example, but they continue to run through and "rotate to" so they end up just swivelling on the spot.

I've set their actor class and their controller class to CustomTimeDilation = 0.0f
How can I ensure the behaviour tree is also slowed down?

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Oh, I might need toget the behavior tree component and set it's time dilation too... forgot it runs as a component

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Hmm no that doesn't seem to be it

lean cliff May 3, 2019, 2:46 PM

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I'm looking at UBrainComponent::PauseLogic() right now - sort of works, but not fully.

For some reason, if I leave it like a second before resuming, it's fine, it resume. However, if I leave it for 10 seconds or so, it seems to restart the behaviour tree (or at least appears to, as it chooses a new target location from the task prior to the MoveTo it paused on

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And for this mechanic, one specific AI is supposed to pause their logic (or path) and then resume afterwards, but pause logic doesn't seem to work as expected

heady raft May 3, 2019, 5:52 PM

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Hey ! I'm having a basic issue, but I can't find anything on this subject online :
I'm trying to have two different navigation system : one for the player, and one for the other AI roaming the level. for that, I made two different supported agent( "player" and "AI"). yet, I can't find a way to make the AI agent work.
-It does not show when I display navigation

I can't assign it to my IA pawn, they keep using the "player" one
when I completely disable the player navmesh, the IA stop moving completely...

What am I doing wrong ? Is there any ressource online explaining how to correctly setup the behavior I'm looking for ?

hoary peak May 4, 2019, 4:28 PM

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How would I make something be a catalyst for a sequence to fire and something else be what keeps it going?(Preferably not requiring BB keys)

finite tundra May 4, 2019, 6:21 PM

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Hey, I'm trying to drive a blend space using the movement speed of my AI character however I've run in to a problem with the input vector on the character movement component. It seems that even though I am making the AI move via the MoveTo task it does not add input to the character movement component. How can I get the input vector that the AI controller is applying to the movement component? This is the approach in my player blueprint where I get the input values (I update these in the input axis events) which I want to use on my AI: https://i.imgur.com/KI0W7GH.png

Imgur

jaunty peak May 4, 2019, 8:29 PM

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@finite tundra would need to see the whole bp

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@hoary peak maybe an interface ?

hoary peak May 4, 2019, 8:32 PM

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I ended up just using a blackboard key to use the built in loop

finite tundra May 4, 2019, 8:33 PM

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@jaunty peak Which blueprint? The image I shared is a section of the Event Blueprint Update Animation event on my player animation blueprint and I want to implement the same sort of behaviour in my AI animation blueprint. The player class has additional variables for storing the movement input on the X and Y directions but I don't know if I can make an AI character use the input vector on the character movement component.

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If there's a way to force the AI controller to use the character movement component instead of whatever it's doing right now when using "MoveTo" that would likely fix my issue as then I can get the movement input vector.

jaunty peak May 4, 2019, 8:36 PM

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Am I right in thinking you're implementing Root Motion animations?

finite tundra May 4, 2019, 8:36 PM

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I am not using root motion animations for my movement, no.

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This is the blend space I'm trying to feed the AI movement speed in to. https://i.imgur.com/J86UhKo.png

Imgur

jaunty peak May 4, 2019, 8:38 PM

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okays 2 secs

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you just want to change the NPCs speed at certain times?

finite tundra May 4, 2019, 8:39 PM

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No, I just want to capture the movement input. Like how when the player uses an axis input the value you get is -1 to 1.

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But it doesn't look like AI uses the movement component

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As the input vector is always 0,0,0 for me

jaunty peak May 4, 2019, 8:40 PM

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why do you want to capture it?

finite tundra May 4, 2019, 8:40 PM

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To plug the value in to my blend space

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To switch between walking/running

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This is my player code for storing the input values

📎 unknown.png

jaunty peak May 4, 2019, 8:45 PM

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Sorry, I'm obviously ,missing something. Your NPC has all the movement variables in the character movement component.

Sorry I'm a BP only person. You can set the animations at whatever value you want, and the npc max walk speed to be what you need. I'm not sure what you mean by plugging it into the BS.

hybrid cipher May 5, 2019, 9:21 PM

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hey a question, I have a large number of AI in the scene that are patrolling and then stop, if the amount of AI gets too high AI seems to be pushed back a little before it stops and starts idling. This is multiplayer game. Any idea what could be causing this or what I should look into?

finite tundra May 6, 2019, 6:06 PM

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Is the Detour Crowd AI controller what I should be looking at using if I want my AI to follow the player but keep a specific distance? I would need to be able to toggle it so that it cab get close to the player to attack at times but I'm unsure if the detour AI controller supports that.

lyric flint May 6, 2019, 7:39 PM

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@finite tundra In your normal AI controller class, use a simple logic based on distance that you can check on tick, no need for Detour Crowd

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pseudocode if(GetDistanceToPlayer(oFollower) > FOLLOWER_DISTANCE MoveToActor(oPlayer)

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And refine this logic as needed

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for example applied only in Explore mode Not in combat mode, etc.

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pseudocode if (GetGameMode()==COMBAT) return , Or something like that

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You may need to write your own functions to implement the above pseudocode

lean cliff May 6, 2019, 10:43 PM

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Hey all, does anyone have any recommendations for optimizing large numbers of crowd ai

I notice at the moment one of the largest performance hits is on the character movement components of them all - any way to easily optimize that?

patent hornet May 6, 2019, 10:46 PM

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NavMeshWalking might help

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as the movement mode

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anything else is not an easy way

lean cliff May 6, 2019, 10:57 PM

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Haha that's fair, I'm also up for not easy ways, was just looking for quick wins in the short term and then investigating longer/harder methods in the coming weeks

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I'm very familiar with most the engine by now (full time programming 5 years on ue4) but haven't really touched AI until recently!
Thanks for the NavMeshWalking tip - totally forgot that existed, should hopefully see some improvement.

I've already coded up some basic "culling" methods for the AI, so once you're out of range for example, the AI will pause their brain components, and pause any movement, and resume both when you return within range.

In the coming weeks I'll likely look into swapping out meshes for sprites over long distance

patent hornet May 6, 2019, 11:01 PM

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disable the CMC tick for inactive AI as well

errant wave May 7, 2019, 12:58 AM

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Hey guys, I have an issue getting ProjectPointToNavigation and my Navigation in general. It can't find the navmesh right under it on one of my levels, but can find it no problem on the other. Both levels have the same NavMeshBoundsVolume/RecastNavMesh, with the same settings. Any idea what setting might cause this?

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Nvm I fixed it. The navmesh was set to not spawn if it was colliding with anything in the actor settings. Wonderful

mystic wind May 7, 2019, 7:08 PM

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Hey guys, I have got a blueprint that uses AI MoveTo to start my spawned characters to move from spawn to the goal, Ive not used any behaviour trees for this or pawns, just a single character BP. I call the AI MoveTo and it works, thats fine. My issue is then when I then use AI MoveTo to tell it to go to a different target. It just stops, the path returns Success then immediately Aborts. Has anyone encountered this before?

simple ivy May 7, 2019, 7:37 PM

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Hey guys, quick question - is there any major reason why you'd use blackboard and behaviour tree rather than just using the event graph in blueprints on the AI class?

jaunty peak May 7, 2019, 8:00 PM

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You mean do everything on the AI controller?

lyric flint May 7, 2019, 8:31 PM

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@simple ivy I guess modularity may be a reason

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@mystic wind Make sure your actor destination/target is being updated on the key. Also you are outside the acceptance radius, that is if you are too close to your new target relative to the acceptance radius

mystic wind May 7, 2019, 8:46 PM

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@lyric flint on the key? Im not using the blackboard for any of this its purely in the characters event graph lol, sorry should have said - Do I need to move to using blackboards? the AI does not need to be no more complex than if there is a new target in range, go to new target.

lyric flint May 7, 2019, 8:48 PM

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@mystic wind Sorry, my bad, if you don't use backboards then there is no reason to worry about keys 😃

mystic wind May 7, 2019, 8:48 PM

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lol, No worries! Its just confusing because whenever the character enters the new space it just stops... its so frustrating! 😄

lyric flint May 7, 2019, 8:49 PM

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@mystic wind MoveToActor Works as long as there is a goal and a nav mesh

mystic wind May 7, 2019, 8:50 PM

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OHHHH

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Ive tried using that node HOWEVER.

lyric flint May 7, 2019, 8:50 PM

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And of course outside the acceptance radius

mystic wind May 7, 2019, 8:50 PM

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You just made me think of the nav mesh - the Navmesh isnt on the spots the actor is located

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Therefore it wont find a valid path.

lyric flint May 7, 2019, 8:51 PM

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correct

mystic wind May 7, 2019, 8:51 PM

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I feel like a pleb haha

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Ive been at this for hours XD

lyric flint May 7, 2019, 8:52 PM

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think DnD, the nav mesh tells the AI: here is safe, no Lava 😄

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I've been in your shoes a while back too 😃

mystic wind May 7, 2019, 8:53 PM

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Haha xD Yeah thats a good analogy :P. Literally want to headbutt my desk so hard right now lol.

fallow hound May 8, 2019, 1:35 AM

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Is ai perception about as performant as using line traces? Or is it doing some sort of more efficient method?

simple ivy May 8, 2019, 5:36 AM

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@jaunty peak - well I have a blueprint class for the AI that uses the controller, but the class has its own "orders" within the event graph for the class. I was wondering if I should continue down this path or start using blackboard and behaviour tree. I'm currently watching a tutorial on it to see

jaunty peak May 8, 2019, 6:58 AM

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@simple ivy Think of it like this. The controller is the brain, the behaviour tree is a list of things to do with the blackboard for remembering certain things. A npc needs a brain, and a list of things to do in given situations. Multiple NPCs can use the same controller, and same BT or could use the same controller and different BTs. This allows the brain bit to deal with things like perception and 'base' behavior rules (what happens when it sees or hears a particular thing, the BT tells the NPC what to do when these things happen. It allows to to easily and quickly modify behaviour for different NPCs without having to rewrite a lot of code or BP.

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you could have it all on the controller but the BT has a easier system to control the behaviour given anything the controller tells it

floral mango May 8, 2019, 7:00 AM

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@fallow hound I haven't actually looked into the out of the box perception code, but it should be much more performant than a dumb line trace, there's lot of opportunity to early out before getting to expensive tests

simple ivy May 8, 2019, 7:01 AM

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@jaunty peak Thanks man I appreciate the explanation, that makes a lot of sense 😃

jaunty peak May 8, 2019, 7:03 AM

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np, you can have a single AI controller and different BTs for each NPC or if you wanted have different BTs for the same NPC, but for different situations like maybe the NPC is in a cave at first then later after rescuing him he's a guard patrolling the city. you can have it all in one BT, but it can get complicated.

simple ivy May 8, 2019, 7:10 AM

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I guess it's a tool that has better scalability for big projects. I am literally trying to get zombies to break down doors and climb through windows haha 😛

Thanks for the explanation. It sounds like it's good practice to get into.

patent hornet May 8, 2019, 8:07 AM

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perception start with cone check iirc

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which is far far cheaper then line trace

fallow hound May 8, 2019, 10:39 AM

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Okay, I should peek into the source when I have a chance

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I'm toying with having one controller for multiple npcs, but as perception is made to be attached to controller I might need to make my own perception

pale night May 8, 2019, 1:56 PM

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My current project Nav Mesh Volume is acting very strange. It was working yesterday fine. I created a new actor put it in the worldspace and now I cant get any of my Networked pawns to move via "Move to Anything(location or actor)." It just says aborted. Ive checked collision, settings after settings. I noticed the bar was all buggy looking too.

📎 question.png

patent hornet May 8, 2019, 1:59 PM

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press P in editor @pale night

pale night May 8, 2019, 2:00 PM

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Im looking to solve why its not working in multiplayer

patent hornet May 8, 2019, 2:00 PM

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AIControllers can't actually move a Pawn locally on clients

pale night May 8, 2019, 2:01 PM

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Ya my AIController is on the server

patent hornet May 8, 2019, 2:01 PM

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so multiplayer shouldn't be an issue here

pale night May 8, 2019, 2:01 PM

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It is which is why i think my nav mesh is bugged

patent hornet May 8, 2019, 2:02 PM

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thats why i told you to hit P

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then you can see it

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it has a few quirks, deleting recast from outliner then moving the navmeshbounds slightly usually fixes it

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usually don't need deleting recast step

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it is not the only possible explanation

pale night May 8, 2019, 2:03 PM

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Can you explain why the nav mesh volume looks so different from one project to the other?

patent hornet May 8, 2019, 2:04 PM

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i don't know what you mean by that

pale night May 8, 2019, 2:04 PM

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in the picture i posted

patent hornet May 8, 2019, 2:05 PM

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that might just be the camera, probably is

pale night May 8, 2019, 2:05 PM

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its not

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i can replicate the buggy nav mesh volume again and again

patent hornet May 8, 2019, 2:06 PM

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well, i don't really have any point of reference to judge on your pic

misty holly May 8, 2019, 3:58 PM

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ik how to see a player for ai like get play character 0 get world location to see one player but how would I go about being able to see more than one ai/character at a time I was wanting to be able to have the ai choose between differnet player/other ai to attack instead of just seeing one

pale night May 8, 2019, 4:56 PM

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Add the reference to an array? and you could randomly pick from the array or set up some type of "agro" table for lack of a better term

misty holly May 8, 2019, 5:24 PM

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okay thx @pale night

lyric flint May 8, 2019, 7:02 PM

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@misty holly UAIPerceptionComponent has a GetCurrentlyPerceivedActors

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e.g. GetCurrentlyPerceivedActors(UAISenseConfig_Sight::StaticClass(), OutActors)

misty holly May 8, 2019, 7:16 PM

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oh wow I didnt know that existed itll be very useful to me thx fam @lyric flint

raven leaf May 9, 2019, 6:17 AM

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I need some vector math help please!
I'm trying to create a behaviour tree task which finds the closest location the pawn needs to be to throw an item at a target location. So far I've created a decorator that finds out if we need to move or can throw, next I just need to create this task which finds a point to move to so they can throw.

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aka: How do I get the closest point in a radius around an actor from another actor's position?

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📎 unknown.png

runic token May 9, 2019, 6:29 AM

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Normalize(PawnLoc - TargetLoc) * Radius

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Add that to TargetLoc

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You also might want to ignore the Z axis

raven leaf May 9, 2019, 6:39 AM

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@runic token Thanks for the help, is this somewhat accurate?

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📎 unknown.png

runic token May 9, 2019, 6:41 AM

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You just need to add the vector from the multiply node to the TargetLocation vector

raven leaf May 9, 2019, 6:42 AM

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Target Location is the target where the AI needs to throw to. Movement location is the blue location (above diagram) where the AI needs to move to to throw

runic token May 9, 2019, 6:44 AM

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yeah, right now it's only calculating an offset.
That offset needs to be applied to the origin of the circle (this being TargetLocation) to get the Move location in World Space

raven leaf May 9, 2019, 6:44 AM

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ooooh I see

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📎 unknown.png

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Like so?

runic token May 9, 2019, 6:45 AM

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yeah

raven leaf May 9, 2019, 6:46 AM

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Great, thank you very much for your help - I am terrible at vector math 😛 Have a good day

runic token May 9, 2019, 6:47 AM

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np

simple ivy May 9, 2019, 10:13 AM

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Hey guys, I need a little bit of help and I can't really find what I'm looking for online.

I am trying to get my AI character to jump in and out of a window blueprint. The player character can do this as well, but I accomplish this by teleporting them from one triggerbox to the other when they press a button on said triggerbox.

If I do this for the AI, they'll just teleport everytime they hit the triggerbox (they're chasing the player). So what I need is for the AI to go into a house if the player is in there, and only go out of the house if there are no players in the house...

Any ideas on a top level on how I can accomplish this? I don't really need technical specifics right now, just something to work towards.

jaunty peak May 9, 2019, 10:16 AM

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have a variable that is set or unset when the player enters or leaves. make the AI do what you need based on that?

patent hornet May 9, 2019, 10:18 AM

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navigation smartlinks

simple ivy May 9, 2019, 10:18 AM

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You mean like a boolean? The problem I see t here is that there are multiple houses in the map and there are a few players as well. I was thinking a nav link proxy would work - but then I need to enable or disable it based on whether the window is fortified or not (which I do have a boolean for to prevent the player from hopping through)

jaunty peak May 9, 2019, 10:22 AM

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multiple houses would work, it would just be an array rather than a single value.

simple ivy May 9, 2019, 10:28 AM

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Hmm thanks (again!) @jaunty peak - that sounds a lil complicated for me, but I'll try it! Thanks!

jaunty peak May 9, 2019, 11:35 AM

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A simpler method would be for each house to have a variable that keeps track of how many players are in it. use beginoverlap and endoverlaps to either add or subtract a player. Add some more logic to your nav link, allowing it to work only if it's 0. Something like that maybe? @simple ivy

patent hornet May 9, 2019, 11:37 AM

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that is pretty bad for performance down the line

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navigation links tell the path following component on ai controller that 2 points are connected

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and ai is able to traverse them, on its own, using regular pathfinding

simple ivy May 9, 2019, 11:40 AM

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However, you can't use nav links on blueprints right? When I looked it up, that's what people were saying to my knowledge - (at least in terms of nav link proxies)

patent hornet May 9, 2019, 11:40 AM

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the boolean or overlap method also introduce additional code complexity, and it is more then a little bit inelegant

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i seem to remember seeing some video that demonstrated them in BP few years back

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you basically want to avoid external object keeping AI relevant flags at all costs

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solid AI is complicated as is, if you break encapsulation, it will never work right

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and don't get me started on how difficult that would be to extend or maintain

simple ivy May 9, 2019, 11:46 AM

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So you'd recommend just using a "Nav Link" component in the blueprint? @patent hornet

patent hornet May 9, 2019, 11:47 AM

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you put navlinks on the map

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i don't know if your specific use case will require alterations that can't be done in BP or not

simple ivy May 9, 2019, 11:48 AM

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@jaunty peak thanks for your feedback! I was in the process of doing something like that and it seems very "messy" haha. I think it's mostly my inexperience.

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@patent hornet , well I think it'd just save me time at the moment if every window I already put in the map had the link. I know there's a component called Nav Link in the blueprint that I can add, but I also know that everything on Google points to Nav Link Proxy

patent hornet May 9, 2019, 11:50 AM

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it would

simple ivy May 9, 2019, 11:50 AM

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and on answer hub someone had my question in 2017 and they came to the conclusion that it can't be done dynamically in each blueprint

patent hornet May 9, 2019, 11:50 AM

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we have a pretty complicated setup, and only some monsters are allowed to hop through windows

simple ivy May 9, 2019, 11:55 AM

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oh so you're working on similar functionality? Awesome! Thanks for the help guys. I'm going to try the nav link proxy and let you know!

pine steeple May 9, 2019, 12:38 PM

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@simple ivy following from what Zlo said

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i made a custom Smart Link Actor component in c++

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which handles it

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but if your BP only, use a Nav Link, but use the smart link version of it

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it fires an event called "Smart linked reached"

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and has the pawn that triggered that smart link

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you can simply call a function on your pawn to do what they need to do when they reach that smart link

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so in our case, when they reach they window, they play a root motion which moves them through the window, but also disables collisions with the window so the capsule can go through without getting stuck

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you could use Launch Character and Suggest Projectile arc to kinda force them over the window

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in an arc

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and play a standard animation whilst they are airborne

simple ivy May 9, 2019, 2:01 PM

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@pine steeple - Hey man, thank you so much that helps a lot!

pine steeple May 9, 2019, 5:24 PM

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@simple ivy if you dont have any luck i can possibly show you a crude example

simple ivy May 9, 2019, 5:38 PM

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@pine steeple haha... hi... yea I would appreciate that.

Right now I have the links setup and they're triggering the smart link - but trying to get them through the window is a problem. I need a command to force them to move forwrad

pine steeple May 9, 2019, 5:38 PM

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there are a few ways to do it

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simplest is LaunchCharacter

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second is RootMotion animation

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third is a Timeline

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which moves them over the window

simple ivy May 9, 2019, 5:39 PM

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I attempted your method above - but couldn't get the projectile part...

pine steeple May 9, 2019, 5:39 PM

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i helped someone here recently

simple ivy May 9, 2019, 5:39 PM

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exactly same thing??

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exact**? xD

pine steeple May 9, 2019, 5:48 PM

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yeah

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dont think i saved the project though

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i made him a quick demo

simple ivy May 9, 2019, 6:39 PM

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OK so I should search through the messages here and there'll be an explanation?

simple ivy May 9, 2019, 9:15 PM

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I couldn't find it. I can't believe there's no tutorial for this. I suspect that this is easier than what I've been attempting.

pine steeple May 9, 2019, 9:50 PM

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sorry been busy

simple ivy May 9, 2019, 9:58 PM

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No Kaos no problem at all, any advice anyone gives here is freely given out of good faith. I appreciate it all 😃

bold sapphire May 10, 2019, 10:51 PM

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any tips on improving performance of behavior trees ai move to. I want 150 ai on the map moving around.

hybrid cipher May 10, 2019, 11:30 PM

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@bold sapphire what are you doing so far? tracking actor should help, but a lot can be done by optimizing character movement component, if you use it

bold sapphire May 10, 2019, 11:34 PM

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yea i use character movement. The issue is that its a war type battle that is going on. So i need 100 ai's moving and attacking all over the map to take over locations. In what ways could I improve the movement component without compromising the battle that is taking place.

hybrid cipher May 11, 2019, 12:34 AM

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hm profile your scene see where the bottleneck is, might not be issue of AI logic at all

bold sapphire May 11, 2019, 2:16 AM

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From the testing I have done, I see that my blackboard was keeping all 150 ai in either moving or attacking state. What I have read everywhere is that 100+ is pushing it for a mobile device like Android. In my case even more so when I have 150 moving at the same time. I was thinking of implementing a que system using an array. That way I can make sure only small number are using the ai move to node at one given time.

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I have tested the blackboard by having a random move to location function. Just by adding a delay after the success pin of the ai move to node it kept the game above 30 fps with 150 ai on screen.

lyric topaz May 11, 2019, 10:44 AM

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Good morning guys, I've started messing around with AI and started using the PawnSensingComponent, The blueprint event gets called just fine, but for some reason my delegate that I bound C++ side isn't being fired for whatever reason. I'm not too sure as to why this is happening. I can see the Delegate being bound in the debugger, but it just refuses to fire in C++ for whatever reason.

{
    const auto ScavengersCharacter = Cast<AScavengersCharacter>(InPawn);
    if (!ScavengersCharacter)
    {
        return;
    }

    Super::OnPossess(InPawn);

    const auto Sensing = ScavengersCharacter->GetPawnSensing();
    if (Sensing)
    {
        Sensing->Activate();
        Sensing->SetSensingUpdatesEnabled(true);
        Sensing->OnSeePawn.AddDynamic(this, &AScavengersAIController::OnSeePawnTemp);
        Sensing->OnHearNoise.AddDynamic(this, &AScavengersAIController::OnHearNoise);
    }
}```

Any ideas?

pine steeple May 11, 2019, 10:55 AM

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PawnSensingComponent is depreaceated

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use PerceptionSystem instead

lyric topaz May 11, 2019, 11:03 AM

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really? I didn't know that. I'll try that out

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thanks

lyric topaz May 11, 2019, 12:58 PM

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sidenote: switched it over to AI Perception and now those components don't show up in editor.

pine steeple May 11, 2019, 1:58 PM

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what components?

lyric topaz May 11, 2019, 2:52 PM

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both the AIPerception and AIPerceptionStimuliSource components, doesn't show up if I were to launch the project, but does when I run it in the debugger, and even then I can't set the senses as it always goes back to none.

bold sapphire May 11, 2019, 4:41 PM

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I don't know why anyone would recommend a broken system like the PerceptionSystem. Write your own perception system. Reason why? PerceptionSystem was never finished like everything ue4 creates. Example: 100+ ai with perception close to each other detect every pawn and there is no way in blueprint to filter enemy vs non enemy. It is a total waste of cpu.

dreamy surge May 11, 2019, 6:50 PM

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I see that my AI skeaton meshes are ticking, do they need to tick can I remove them>

jaunty peak May 11, 2019, 6:54 PM

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@bold sapphire Can you not use actor tags? and just look for actors with appropriate tag(s)?

timber hawk May 12, 2019, 4:26 PM

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can someone help me?

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https://gfycat.com/FrequentKindheartedAlaskajingle

Gfycat

MyProject3 - Unreal Editor 5 12 2019 1 23 56 PM

▶ Play video

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i don't know how to get the ai to keep going

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it just stops right outside the players hitbox

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it's supposed to run into you then when it gets there the level will reset

hybrid cipher May 12, 2019, 11:23 PM

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@timber hawk make sure that player collision doesn't block AI, should be able to set it in capsule collider component

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if you want to detect ai running into player, it should be turned into overlap and generate events on overlap

timber hawk May 12, 2019, 11:45 PM

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📎 unknown.png

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the bottom one is what i have now

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when i change it to overlap it doesn't do anything

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i'm also new to unreal engine btw

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@hybrid cipher

hybrid cipher May 12, 2019, 11:53 PM

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Eh sry I'm on phone atm

timber hawk May 12, 2019, 11:54 PM

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it's alright

hybrid cipher May 12, 2019, 11:55 PM

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https://docs.unrealengine.com/en-us/Engine/Content/Types/StaticMeshes/HowTo/SettingCollision

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There's a bit about collision preset at the end

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And just skim through this quickly to see how generate overlap events https://docs.unrealengine.com/en-us/Engine/Physics/Collision/Overview

timber hawk May 13, 2019, 12:29 AM

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i figured it out

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thanks for the help @hybrid cipher

hybrid cipher May 13, 2019, 1:02 AM

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Ah cool, np

dire moss May 13, 2019, 6:01 AM

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hello, i have player character and ai enemies loaded into a sub level, when streaming in to another sub level and going back to the previous level, it seems that the ai sight perception can no longer see the player, but after they hear me, they can then see me again.
Has anyone run into this issue before?

torpid trout May 13, 2019, 9:32 AM

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Hi guys. I have a pawn which is made for a multiplayer game. It has weapons and health. I want the same pawn to be used as AI and use it to battle the human players by using the weapons and racing/tracking other players

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Where should I start?

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and can someone give a rough roadmap of how this would be achievable

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some resources which might be helpful for the implementation will be a bonus

wary ivy May 13, 2019, 11:34 AM

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character class is really, really heavy

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having 100s of characters running about will tank your performance :\

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...oh

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I was looking at saturday's messages

tough helm May 13, 2019, 2:03 PM

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how can I use AI Sight Stimuli so that I keep receiving events if the AI still sees the target?

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I want to implement waiting while seeing for a bit, not aggro immediately

hybrid cipher May 13, 2019, 2:32 PM

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@tough helm you can probably just use timer when AI first sees the player and execute logic after a while

tough helm May 13, 2019, 2:34 PM

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well I need to "increase threat" while player is seen and decrease while it's not seen

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so at least I would need a target lost sight event or something

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currently I'm playing around with NotifyType in UAISense_Sight

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ok figured it out

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for future reference, UAISense and derived UAISense_Sight have NotifyType which is cofigurable from config

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so I just pust

[/Script/AIModule.AISense_Sight]
NotifyType=OnEveryPerception

into DefaultGame.ini

lyric flint May 13, 2019, 3:00 PM

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@tough helm thanks for sharing! 😃

jaunty peak May 13, 2019, 5:18 PM

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@tough helm I'm fairly sure you don't need to do that. I know I didn't and AI Perception gets updated on sight or loss of sight (I've used print$ to check).

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But then I may be using different exe nodes than you.

tough helm May 13, 2019, 5:21 PM

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i needed to continuously report that AI still sees the target so I can accumulate a "threat meter"