#gameplay-ai | Unreal Source | Page 129

patent hornet Jul 31, 2020, 6:13 AM

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"Target is Blackboard Component"

ivory violet Jul 31, 2020, 6:14 AM

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I cannot get it in either AIC or BT Task, thats why Im asking. Maybe Im missing something, I saw that part 😦

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Found it dafuq taking directly from blackboard, not alone by itself

patent hornet Jul 31, 2020, 6:21 AM

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yeah, thats what the Target part is for

static crater Jul 31, 2020, 8:09 AM

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Hi, so anyone knows how to disable regeneration of navmesh on begin play? my navmesh is pretty large so it takes like a minute

patent hornet Jul 31, 2020, 8:11 AM

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seems like navigation in project settings

static crater Jul 31, 2020, 8:20 AM

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it only happens when i set 'runtime generation' to dynamic modifiers only

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on 'dynamic' the game just starts instantly

ivory violet Jul 31, 2020, 9:21 AM

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Any ideas how to make my Ai better know what other ones are doing? For example, if one enemy wants to attack me, I want other enemies to know that, and not consider attacking. But sometimes it happens that more than 2 decide at the same time and just come at me. I know its big part of Ai, but any big or small directions would help me out!
Atm Im setting the variable about OngoingAttack in some global enemy manager, but it doesnt seem like the best approach so far.

misty wharf Jul 31, 2020, 9:34 AM

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I was debating implementing something similar in my game, and one method I thought of would be to use a sort of a "director" actor

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Basically the director would keep track of what the individual NPC's are doing, and tell them to do something different if there's a conflict

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Alternatively you would probably have to have each AI controller query any other controllers about what they're doing before deciding what to do

ivory violet Jul 31, 2020, 9:36 AM

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Wouldnt it be too performance heavy if I had to do for each for all enemies whenever I try to make a decision?

misty wharf Jul 31, 2020, 9:37 AM

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there's probably a number of ways you could implement it, like having some way of keeping a simpler list of who's doing what for example by using gameplay tags

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you could then query that to see if any other controller is doing something based on the tags or such

ivory violet Jul 31, 2020, 9:38 AM

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Ill have to try something with that actor to help them out. And I guess Ill think about optimization after Ive made it work 😄 Thx!

craggy bloom Jul 31, 2020, 9:48 AM

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When my player characer (ghost) is out of sight from a human (AI) and makes a noise, the AI can hear and see the player at the same time. I'm wondering why this is because the player is clearly out of trace sight in the AI debug view? Vision angle is set to 45 degrees.

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📎 unknown.png

thorny jay Jul 31, 2020, 9:51 AM

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Hi everyone. Is there a good way I can ensure that 5000 actors remain on the floor while moving around without doing a trace each tick to find the floor and align them? I had an idea on using the navmesh and just having them move along the navmesh, since the navmesh should already (for the most part) hug the floor pretty closely

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Just wondering if anyone else has tried simulating huge crowds like this before. I know UDK had a crowd system, but I can't seem to find any info on it for UE4

patent hornet Jul 31, 2020, 1:01 PM

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NavMeshWalking does the trace as well

pine steeple Jul 31, 2020, 2:06 PM

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its not a line trace tho, its a nav projection trace

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(which is a little cheaper)

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but 5000 actors is a lot

thorny jay Jul 31, 2020, 3:55 PM

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Yeah I'm doing some experiments, I can get around 4000 running reasonably, but I need an efficient way to reduce tick rate on actors that are further away

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Ticking once every 0.1s is manageable, but then movement is jittery. That won't matter though if the unit is far away

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So some sort of "tick LOD" might work

soft sleet Jul 31, 2020, 6:11 PM

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This is for an ai to restart level when he touches me, but it doesn’t work. I have another blueprint for the ai to follow me which works but it doesn’t restart level when it touches me. I have his collision set to ignore everything but pawn, and this is a blender imported model. Any help??? Thanks!!!

📎 image0.jpg

tame knot Jul 31, 2020, 6:27 PM

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there is a crowd manager in UE4 but I've never used it, it was released with the open-world tools, UCrowdManager and the CrowdFollowingComponent

thorny jay Jul 31, 2020, 6:39 PM

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@tame knot Interesting. I cannot find any useful guides on how to use it, or what its capabilities are. The only tutorial I could find seems to have a broken link. How strange

tame knot Jul 31, 2020, 6:45 PM

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if I remember correctly it was used for the deer and stuff in the kite demo so there might be something in the open world videos

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or you might just have to read the source

thorny jay Jul 31, 2020, 7:31 PM

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@tame knot Ugh, who does reading in this day and age?! Thanks, I'll take a look :-)

patent hornet Jul 31, 2020, 10:15 PM

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@thorny jay it does fairly decent crowd avoidance as long as you have only one nav agent and don't dynamically generate nav meshes

honest plume Aug 1, 2020, 4:08 AM

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Is there a way to fix server lag when spawning 200 - 250 AI Mobile units?

north vapor Aug 1, 2020, 5:10 AM

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@patent hornet are you there?

plush pasture Aug 1, 2020, 12:31 PM

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https://i.imgur.com/p8DtYpw.png

Imgur

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anyone know how to make my navmesh go through doors?

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ive already tried messing with the project settings values of navigation section

fierce zealot Aug 1, 2020, 12:59 PM

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you can set your navmesh to update at runtime and then, when the door openes, the navmesh adjusts. Otherwise you will need to updated your door to not have impact to navigation

tame knot Aug 1, 2020, 1:22 PM

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you can also use navmesh links

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that's what I did for my doors

plush pasture Aug 1, 2020, 1:36 PM

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nav mesh links huh?

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thanks

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the door isnt actually affecting the navigation

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forgot to mention that

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i solved issue with making cell size lower

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longer compile times but now theres a connection

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@tame knot https://i.imgur.com/WI38P6k.png

Imgur

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do i just add it and thats it?

tame knot Aug 1, 2020, 1:39 PM

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yeah

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it exactly for this purpose, linking two otherwise unconnected sections of navmesh

plush pasture Aug 1, 2020, 1:39 PM

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noice

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thanks

thorny jay Aug 1, 2020, 2:28 PM

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@plush pasture note that with simple links, they will be always active unless blocked by a nav modifier

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If the bot has to manually open a door, you need a smart link

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Otherwise they will just run into the door endlessly :-P

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In the smart link you can override a function called "on smart link reached" or something, and just open the door for them in that event

plush pasture Aug 1, 2020, 3:31 PM

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@thorny jay thanks for the info man

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does this work with jumping in some way?

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i mean, if i wanted bot to jump over bump, i would do that using smart link right?

thorny jay Aug 1, 2020, 3:57 PM

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@plush pasture yes, in my case I use launch character with a configurable force parameter to determine how high the jump should be

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If using smart links for jumping, remember to remove the simple links and make the smart link relevant

tame knot Aug 1, 2020, 4:05 PM

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oh yeah, my doors are opened by an explicit player action so I just instantiate the link when that happens

north vapor Aug 1, 2020, 5:58 PM

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im starting to get used to behavior learning blackboards and tasks but this task isn't firing anyone know why

📎 unknown.png

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📎 unknown.png

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the task im referring to is the last seen location in the pngs above

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the first one is the task

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the rest works but when i added this task the behavior tree stop working

cerulean tendon Aug 1, 2020, 9:26 PM

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Who can do me AI plz ? I can pay

fallow hound Aug 1, 2020, 9:59 PM

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#looking-for-talent

north vapor Aug 1, 2020, 10:27 PM

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how do you do a last seen location task

lyric flint Aug 1, 2020, 10:29 PM

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@north vapor did you do a on fail print string?

north vapor Aug 1, 2020, 10:30 PM

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i redid my behavior tree @lyric flint

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the png are old

lyric flint Aug 1, 2020, 10:30 PM

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o sorry didn't look at the time

north vapor Aug 1, 2020, 10:30 PM

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@lyric flint how do you do a last seen location?

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lemme show my behavior tree

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@lyric flint

📎 unknown.png

lyric flint Aug 1, 2020, 10:31 PM

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well i never done a last seen location but i can think about it

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could have maybe in the controller on perception update check if the perception was Sight then update a vector to have your actors location at that time

north vapor Aug 1, 2020, 10:32 PM

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ok

lyric flint Aug 1, 2020, 10:33 PM

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📎 UE4Editor_XtMI8CDm6M.png

lyric flint Aug 2, 2020, 2:11 AM

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Whats the Tag used for on AIStimulus break?

📎 UE4Editor_Cq3d5L8MUF.png

inland umbra Aug 2, 2020, 2:52 AM

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Tag is used for whatever you want 🙂 You set it when you report some sense event.

north vapor Aug 2, 2020, 2:53 AM

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@inland umbra my ai isnt hearing the pawn

lyric flint Aug 2, 2020, 2:53 AM

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@inland umbra oo like those report functions gotcha

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📎 UE4Editor_tvvdZ0Bi3b.png

north vapor Aug 2, 2020, 2:55 AM

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📎 unknown.png

inland umbra Aug 2, 2020, 2:55 AM

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@north vapor I don't use default hearing and I don't have your code, so I have no idea what is wrong 🙂

north vapor Aug 2, 2020, 2:55 AM

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📎 unknown.png

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📎 unknown.png

lyric flint Aug 2, 2020, 2:55 AM

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📎 UE4Editor_tyZ4pjrrku.png

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actor has tag works if you do it this way

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pretty sure aistimulus tags are only for reports like nicolas said

north vapor Aug 2, 2020, 2:57 AM

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@lyric flint so just use actor has tag? @inland umbra

inland umbra Aug 2, 2020, 2:57 AM

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Yeah, stimulus & senses tags have nothing to do with actor & component tags

lyric flint Aug 2, 2020, 2:58 AM

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id try the report noise event function

north vapor Aug 2, 2020, 2:58 AM

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@lyric flint @inland umbra like this

📎 unknown.png

lyric flint Aug 2, 2020, 2:59 AM

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1 sec

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you dont need to cast

north vapor Aug 2, 2020, 2:59 AM

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ok

lyric flint Aug 2, 2020, 3:00 AM

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not sure on that though

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when you make the noise do that function

north vapor Aug 2, 2020, 3:01 AM

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@lyric flint my player makes noise whenever he moves and reports it but im not sure what to do

lyric flint Aug 2, 2020, 3:01 AM

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did you give it a tag

north vapor Aug 2, 2020, 3:01 AM

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yes

lyric flint Aug 2, 2020, 3:01 AM

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Noise?

north vapor Aug 2, 2020, 3:01 AM

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yes

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i called it noise

lyric flint Aug 2, 2020, 3:01 AM

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use the debug tool that shows the perceptions

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should draw a sphere i thinkk

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for noise

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i'll have to try this myself inorder to be any help

north vapor Aug 2, 2020, 3:02 AM

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@lyric flint so my blueprint does work just have to debug to see if it works

lyric flint Aug 2, 2020, 3:03 AM

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always got to print strings and debug to understand this stuff lel

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@north vapor i think you need an instigator

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which would be your player controller

north vapor Aug 2, 2020, 3:06 AM

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@lyric flint it is set to self in my player blueprint

lyric flint Aug 2, 2020, 3:06 AM

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is self a ref to controller?

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im not sure

north vapor Aug 2, 2020, 3:07 AM

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self being a ref to the player or ai

lyric flint Aug 2, 2020, 3:07 AM

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instigator is for who caused the noise

north vapor Aug 2, 2020, 3:08 AM

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which i want to be the player

lyric flint Aug 2, 2020, 3:08 AM

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yah so it needs a reference to that players controller

north vapor Aug 2, 2020, 3:09 AM

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should i cast instead

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to the player

lyric flint Aug 2, 2020, 3:09 AM

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sec im testing this

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@north vapor yah i think you need to report noise on the AI

stiff gale Aug 2, 2020, 3:33 AM

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How the AI spawning system works in games like Witcher 3 and GTA5? I'm trying to understand the high level concept. Would it be possible in UE4?

lyric flint Aug 2, 2020, 3:33 AM

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@north vapor character needs a pawnnoiseemitter component if you don't already have 1 (doesn't actually there are 2 methods for doing this)

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@stiff gale i believe they spawn in areas which are underpopulated, in GTA V. if the region contains less than a certain number of entities they spawn into the world above the landscape.

stiff gale Aug 2, 2020, 3:47 AM

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Do they spawn NPC based on triggers? Let's say I enter an area then all the npc in that area get spawned. When I leave that area the de-spawn.

lyric flint Aug 2, 2020, 3:47 AM

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@north vapor got it to work

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basically you need to check all affliations on

fiery palm Aug 2, 2020, 9:11 AM

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hey yall! Im new to this server and to unreal but i'll try and make my problem quick. I have a Ai using nav mesh and it works in the editor and in final package on "LEVEL-1" but when I try to use "LEVEL-0" in conjunction the Ai seems to break and not move. not sure if its a level issue with the nav mesh or if its how the nodes are setup. From all the reserch ive done ive only found one thing about Ai and level problems. Im also using the base of the mannequin blueprints for input controls so it may look a bit funky

📎 unknown.png

fallow hound Aug 2, 2020, 10:38 AM

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press ' them numpad 4 to see navmesh while playing

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thats a good first step

lyric flint Aug 2, 2020, 1:12 PM

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Good time of day! Characters are not blocking navigation mesh for AI. I need to achieve this effect

📎 unknown.png

fallow hound Aug 2, 2020, 1:21 PM

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I haven't done that, but maybe with dynamic nav mesh and player capsule being a dynamic obstacle?

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dynamic navmesh is in project settings

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obstacle would be in capsule settings? or actor settings.

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I'm just guessing

lyric flint Aug 2, 2020, 1:24 PM

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@fallow hound

📎 unknown.png

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Already tried. It didn't work

fallow hound Aug 2, 2020, 1:24 PM

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what about dynamic obstacle on player capsule?

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also theres some bool like bcaneveraffectnav

tame knot Aug 2, 2020, 1:25 PM

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You really don’t want to be updating navmesh like that as characters move around

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That’s why there rvo

fallow hound Aug 2, 2020, 1:25 PM

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that too ^

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but rvo just kind of pushes characters away from eachother I think?

tame knot Aug 2, 2020, 1:26 PM

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If they’re static or mostly static or you have some other reason using can ever affect nav should do it

fallow hound Aug 2, 2020, 1:26 PM

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I dunno if it does nav stuff

lyric flint Aug 2, 2020, 1:26 PM

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The component for this calls

📎 unknown.png

tame knot Aug 2, 2020, 1:26 PM

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Right it doesn’t factor into path generation, it happens locally

fallow hound Aug 2, 2020, 1:26 PM

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yeah

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I dont think you can have moving nav modifiers

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ukaos once said don't do it

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and he knows a thing or two

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I dunno what this is

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📎 unknown.png

tame knot Aug 2, 2020, 1:28 PM

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Making navmesh isn’t free, not even cheap

fallow hound Aug 2, 2020, 1:28 PM

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but its in my char capsule

tame knot Aug 2, 2020, 1:28 PM

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That’s why it’s an offline operation by default

pine steeple Aug 2, 2020, 2:54 PM

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RVO can be tweaked to be less aggressive, but updating the navmesh with a moving modifier is pretty taxing, Really wish there was some avoidance component you can place on chars which could be used with Crowd Avoidance, and register that char as an obstacle

stark zealot Aug 2, 2020, 11:56 PM

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So for my simple roaming state for my AI I just use the get reachable point in nav radius. But sometimes the AI pick locations really close together with makes them twitch around a bit and look unrealistic. How can I only get points on the outer radius of the circle?

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I know I could check the distance between the random point and the AI and if it's too short, then pick another point, but that seems like it could run into issues of looping forever trying to find a point.

lyric flint Aug 3, 2020, 12:06 AM

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@stark zealot You might want to just get two random numbers, in example one from 75 to 100, and another from 150-359 (maybe first have a check to see if the upper range is within a navigable reach).

Then use those values to determine the right place relative to the spawner origin.

you can then place the origin point of the get reachable point in nav radius as this point, and if the origin point is far away enough from the origin of the AI pawn, it should usually cause them to move fairly far away and not move in short amounts.

stark zealot Aug 3, 2020, 12:28 AM

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Thanks that seems to work perfect. 🙂

dense halo Aug 3, 2020, 3:37 AM

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📎 Capture.PNG

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hey could someone help me with this behaviour tree?

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basically I try to get the nearest target, in the simple parallel node I do Move To the actor and then do the attack task if the targets within melee range

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in the right hand side of the tree, the top level sequence has a service which basically checks the distance every 0.5 sec to see if the character is in melee ranage

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but the issue is that when it is in melee range, the whole thing glitches out

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📎 Capture.PNG

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the whole markers keeps flashing because the Move To task keeps ending and then starting again

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is there a way to make the Move To indefinite? since I want my ai to always follow the player around non-stop and keep attacking

lyric flint Aug 3, 2020, 4:29 AM

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@dense halo you figure this out?

dense halo Aug 3, 2020, 4:33 AM

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@lyric flint for now I'm just putting an infinite loop decorator on the Move To

lyric flint Aug 3, 2020, 4:34 AM

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well from what i see that your aborting your 2nd branch from root with your first branch

dense halo Aug 3, 2020, 4:35 AM

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that's set to abort if there is no target actor, the target actor doesn't get removed once it's assigned

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the Move To just ends after it gets within the radius and it starts all over again

lyric flint Aug 3, 2020, 4:36 AM

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did you try abort self instead of lower priority?

dense halo Aug 3, 2020, 4:36 AM

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yes

lyric flint Aug 3, 2020, 4:36 AM

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oo i see

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so it gets that actor

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but u sure u can do it that way

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im pretty sure after it sets the actor

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next time it trys to run that branch its always going to abort that lower priority

dense halo Aug 3, 2020, 4:39 AM

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it has no reason to run that branch next time

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it runs the first time, set the actor and move on to the right branch

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the target never gets removed

simple crest Aug 3, 2020, 4:40 AM

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parallel finish mode set to immediate or delayed?

dense halo Aug 3, 2020, 4:40 AM

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delayed

simple crest Aug 3, 2020, 4:43 AM

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I don't know how MoveTo works internally or if there's a way to fix it, but if you made a custom task node you might be able to set it to run Move to Actor without "finishing"

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I would've thought MoveTo would do the same thing if acceptance radius is -1 and you set an Actor to it somehow though

dense halo Aug 3, 2020, 4:46 AM

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yeah I tried setting it to -1 but the minimum is 0 and I disabled the collisions between characters so they will get there anyway

simple crest Aug 3, 2020, 4:48 AM

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doh

dense halo Aug 3, 2020, 4:50 AM

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I'll just use the loop decorator for now and create my own move to later if needed

ivory violet Aug 3, 2020, 9:06 AM

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@dense halo why not just put Attack after MoveTo, and not in simple parallel? That way, once MoveTo is done and character is in range, it will run Attack without moving. Or you want for some reason character to keep moving while attacking?

dense halo Aug 3, 2020, 5:37 PM

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@ivory violet most of my mob ai can move while attacking, I have some ai that do heavy attack where they stop moving but for those ones I want to stop their movement in their ability

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does anyone know if the EQS can be used to basically get an actor instead of a point on the generated grids?

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I just started using EQS, I want to basically do a distance and dot test on my a list of selected player characters and get the best matching character

wise iris Aug 3, 2020, 7:16 PM

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Looking into crowd management and I'm tearing my hair out

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RVO is a no go as it doesn't play nice with multiplayer apparently and agents can get stuck in non-navigable areas. I then tried the Detour Crowd AIController, but characters twitch/jitter

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How are you guys solving these issues?

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This seemingly has come up a bunch of times in the Discord, with little to no answers 😦

dense halo Aug 3, 2020, 7:20 PM

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I saw a video the unreal engine youtube channel, or might have been one of their community training stream things but they create a large number of AI

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not sure if it will work with multiplayer though

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not sure if I have the video bookmarked

valid tree Aug 3, 2020, 7:57 PM

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I was just looking at the crowd management too. I believe this is the video unreal made that you are talking about. They basically have a service to see if the AI is ‘jammed’ and then they recalculate the targetposition. https://m.youtube.com/watch?v=cFYk1tEgyGI

YouTube

Unreal Engine

Complex AI Interactions & Optimization | Live Training | Unreal Engine

Announce Post:https://forums.unrealengine.com/showthread.php?86086

Ian Shadden shows you how to setup interactions between Behavior Trees and AnimBlueprints to perform complex moves such as mantling over objects in the world. He also covers general optimization techniques you...

▶ Play video

dense halo Aug 3, 2020, 8:04 PM

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yeah, and there was another one but I think they were showing off physics based animations or something

wise iris Aug 3, 2020, 8:09 PM

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I'll take a look at that ❤️

valid tree Aug 3, 2020, 9:02 PM

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Although I haven’t actually done their method yet, I’ve been working on it today and I’m having issues as usual so that’s fun

dense halo Aug 3, 2020, 9:30 PM

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anyone know why receive execution start does not run on the decorator?

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is it meant to be like that?

dense halo Aug 3, 2020, 9:47 PM

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I need to cast my pawn to something but I don't want to do it on Check since that seems to fire every tick, is there anywhere else I can do this or should I use a service?

lyric flint Aug 3, 2020, 11:58 PM

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@dense halo not really explaining yourself clearly.

dense halo Aug 4, 2020, 12:05 AM

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basically I want to make a decorator, and inside the decorator where you have the Check execution I want to do a cast but since I have a lot of ai, I want to basically cast it and store it as a variable which I can reuse when it runs the check again

lyric flint Aug 4, 2020, 12:06 AM

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but this decorator fires often

dense halo Aug 4, 2020, 12:07 AM

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yeah

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that's why I want to use the Execution start event which doesn't fire on the decorator for some reason

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it works fine on the services, where I did the cast and stored it to a variable and in the tick I would just use that variable

lyric flint Aug 4, 2020, 12:08 AM

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a cast to do what

dense halo Aug 4, 2020, 12:08 AM

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controlled pawn to my blueprint class

lyric flint Aug 4, 2020, 12:09 AM

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like the tick in controller?

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what tick?

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oo service tick

dense halo Aug 4, 2020, 12:11 AM

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anyway, it doesn't matter

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i just want to know why execution start event doesn't fire on the decorator

lyric flint Aug 4, 2020, 12:11 AM

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basically its probably easier to find solutions if you state what you're trying to do.

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like the reason because there might be a better approach

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i think you have to override

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a function to

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do that for the decorator

dense halo Aug 4, 2020, 12:13 AM

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done it already

lyric flint Aug 4, 2020, 12:15 AM

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i just tried it seems to work for me

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seems like the Start AI overrides the Execution start 1

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Sometimes things can get really glitched and stop working

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i've experienced it were all my code changes just weren't doing anything and had to restart my computer

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not sure if thats the case here

dense halo Aug 4, 2020, 12:21 AM

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tried the search start ai as well, that one doesn't work for me either

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might try restarting

lyric flint Aug 4, 2020, 12:21 AM

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try a print string

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anywhere

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if it doesn't work then you know

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🙂

light kindle Aug 4, 2020, 1:28 AM

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What does the Gameplay Tag Condition decorator do? Trying to get it working with gameplay tags but I'm headbanging the wall here. Or does this only work with the actor tags Fname array but not Gameplay Tag Containers?

lyric flint Aug 4, 2020, 1:29 AM

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i have a question cause i know nothing about ai, but how would one ai lets say move to another ai if they are the same actor

lyric flint Aug 4, 2020, 1:54 AM

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@lyric flint AI MoveTo https://docs.unrealengine.com/en-US/BlueprintAPI/AI/AIMoveTo/index.html

AI MoveTo

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i mean

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i know how to move a ai

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but

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i dont know how can one ai find another ai of the same class xd

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cause i would want them to "talk" but i first have to make them move to each other

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@lyric flint you have to trigger the move somehow in your logic, when the AI movement is triggered, you can get all actors of class https://docs.unrealengine.com/en-US/BlueprintAPI/Utilities/GetAllActorsOfClass/index.html or Get All Actors with Tag. if you want to have the AI move to the closest one of the same class, you have to have a distance check.

Get All Actors Of Class

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yep still dont know but gonna act like i do xd

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might take some testing

lyric flint Aug 4, 2020, 2:52 AM

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ok i figured it out was pretty easy xd

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and another question i have a selector and two sequences and why it only chooses the left one and after its finished it doesnt go to the next one but just takes the first one agane

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nvm just dumb

light kindle Aug 4, 2020, 7:49 AM

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What does the Gameplay Tag Condition decorator do? Trying to get it working with gameplay tags but I'm headbanging the wall here. Or does this only work with the actor tags Fname array but not Gameplay Tag Containers?

No idea? So a custom decorator it is then... still easier then looking up in the source code how this thing works 🤷‍♂️

light kindle Aug 4, 2020, 8:06 AM

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And now it works like a charm. Still I feel stupid as a dev since I feel like I just reimplemented something UE seems to have as a feature. Anyways, if I can implement it in 5min but don't understand the UE feature in hours something is odd and documentation lacking big time.

verbal violet Aug 4, 2020, 9:28 AM

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Hi folks. Is there some Task in BehaviorTree similar to MoveTo but not to rotate actor in direction of movement? I try to fin some checkbox on MoveTo or other task (MoveToward) but unsuccessfully.

dense halo Aug 4, 2020, 10:21 AM

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Does anyone know why receieve execution start / ai doesn't seem to fire on the decorator?

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tried restarting, creating a new decorator

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still doesn't seem to work

fallow hound Aug 4, 2020, 11:12 AM

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@verbal violet I think that logic in in the character class, something like "face controller yaw" or something

verbal violet Aug 4, 2020, 11:32 AM

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@fallow hound i found tnx

honest plume Aug 4, 2020, 12:50 PM

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How to cast to AI character?

lyric flint Aug 4, 2020, 1:01 PM

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get all actors of class

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or get player pawn

pine steeple Aug 4, 2020, 1:42 PM

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or neither cause they are both wrong?

lyric flint Aug 4, 2020, 1:56 PM

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oh ok xd

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then tell us how cause it worked for me

pine steeple Aug 4, 2020, 2:08 PM

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i created a spawn manager, that holds pointers to all spawned AI. If i need to iterate through them, i do so. But if you set up proper references, then you never need to use GetAllActorsOfClass.

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and GetPlayerPawn returns a player, not an AI character.

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i use GetAllActorsOfClass ONLY at beginplay and i store the stuff in arrays. So i never use it again

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but as @honest plume always asks vague simple questions, with no context. I never bother to reply.

lyric flint Aug 4, 2020, 2:16 PM

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waytoosmart

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i used perception to get ai references and reset an array variable every update in the controller

cerulean plover Aug 4, 2020, 2:27 PM

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Hello, i'm trying to create an AI Controller and in BeginPlay i use MoveToActor but the character doesnt move, any suggestion or things im missing? The NavMesh it's already in there since my playercharacter moves with it
MoveToActor(GetWorld()->GetFirstPlayerController()->GetPawn()); thats the only code literally

lyric flint Aug 4, 2020, 2:27 PM

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@cerulean plover did you use spawn actor ai node?

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because spawn actor node doesn't run controller logic

cerulean plover Aug 4, 2020, 2:29 PM

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nope i have already my character on the scene with ai controller set as a controller

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everything is in the scene

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but it doesnt move

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something is missing

lyric flint Aug 4, 2020, 2:29 PM

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show the movetofunction with a picture

cerulean plover Aug 4, 2020, 2:30 PM

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really its just that

📎 Cattura.PNG

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but neither movetolocation works

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doesnt seem code related but something in params or envirnoment

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that is missing

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but my player that i move its working :\

pine steeple Aug 4, 2020, 2:31 PM

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never call stuff like that in begin play

cerulean plover Aug 4, 2020, 2:32 PM

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its a test

pine steeple Aug 4, 2020, 2:32 PM

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how is it going to move without a possessed pawn?

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beginplay is called BEFORE it has a pawn

cerulean plover Aug 4, 2020, 2:32 PM

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but the controller is created after the character

pine steeple Aug 4, 2020, 2:32 PM

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no it is not

misty wharf Aug 4, 2020, 2:32 PM

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Anyone got tips for using the EQS testing pawn with queries that have more complex EQ contexts? I have a context that returns the location from a blackboard value for example

pine steeple Aug 4, 2020, 2:32 PM

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even if it is, possession doesn't happen before begin play

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so controller has NO pawn

cerulean plover Aug 4, 2020, 2:33 PM

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alright i will try move it somewhere else

pine steeple Aug 4, 2020, 2:33 PM

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move it to PossessedBy

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you know you have a pawn there

cerulean plover Aug 4, 2020, 2:33 PM

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it was intuitive to me that it was possessed since i dont create it but the character itself since i set it there

pine steeple Aug 4, 2020, 2:33 PM

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your assumptions were wrong

cerulean plover Aug 4, 2020, 2:33 PM

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alright

pine steeple Aug 4, 2020, 2:33 PM

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😄

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so move it to possessedby and it should work

cerulean plover Aug 4, 2020, 2:34 PM

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You mean OnPossess?

pine steeple Aug 4, 2020, 2:35 PM

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ah PossessedBy is the Pawn version

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yeah OnPossess

cerulean plover Aug 4, 2020, 2:44 PM

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I made my tests and onpossess is done before beginplay

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and there i cant find player pawn

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since its not already spawned

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oof

reef birch Aug 4, 2020, 3:29 PM

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i have a very weird issue with my ai. i have a small development map with terrain. all works fine. when i load another map (spring landscape free for the month asset)

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my AI jitters between idle/walk state while moving

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why does this occur on a different map and not on my development map

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i just load another map and this issue starts

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https://www.twitch.tv/videos/700011474

Twitch

Unreal Engine - Game Development "ZPositive" - z_positive on Twitch

z_positive went live on Twitch. Catch up on their Science & Technology VOD now.

▶ Play video

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video of the issue

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i even removed the idle state inside the animbp

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and it still jitters like crazy, im loosing my mind here

reef birch Aug 4, 2020, 4:01 PM

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seems i was stupid, ignore the question.

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allthough its very strange it only comes up by loading a different map

reef birch Aug 4, 2020, 6:17 PM

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i thought i figured it out.. but the issue still persist so a bump

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i dont even know where to start debugging.

slow turret Aug 4, 2020, 8:12 PM

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anyone know how to make a simple ai that moves to an actor/bp in the level scene?

pine steeple Aug 4, 2020, 8:27 PM

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MoveToActor node?

glossy spire Aug 4, 2020, 10:35 PM

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@reef birch maybe their behavior tree is switching between targets very quickly

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or something like that

gaunt kite Aug 5, 2020, 2:31 AM

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I'm trying to make a crowd movement on a spline patrol, how do you get suggest me do that ? I've already set the AI spline patrol
now all I need is to make them all walk on those spline waypoints but in a specific distance between each other

urban wadi Aug 5, 2020, 6:42 AM

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When shooting a projectile does it have to be from a socket or mesh, or can it be from any arbitrary defined transform?

heavy plank Aug 5, 2020, 7:48 AM

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Hi guys I have my BTTask in C++, ```EBTNodeResult::Type UMinionBTTask_MoveDirectlyToward::ExecuteTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)
{
const auto MinionCharacter = Cast<AMinionCharacter>(OwnerComp.GetAIOwner()->GetCharacter());
if (MinionCharacter)
{
auto Blackboard = UAIBlueprintHelperLibrary::GetBlackboard(MinionCharacter);
const FVector NextLocation = MinionCharacter->MinionWayPointModel->GetNextSplineLocationToMove();
UE_LOG(LogTemp, Warning, TEXT("MOVE TO LOCATION - %s"), *NextLocation.ToString());
Blackboard->SetValueAsVector(FName("NextSplineMoveToLocation"), NextLocation);
MinionCharacter->StartJogging();
}

const auto SuperResult = Super::ExecuteTask(OwnerComp, NodeMemory);
if (SuperResult == EBTNodeResult::Succeeded)
{
}
else
{
    //Failed to MoveTo Location, so rolling back action.
    MinionCharacter->MinionWayPointModel->RollbackCurrentAction();
}
return SuperResult;

}```

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The weird thing is its logging in loops

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so is it expected behavior???

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📎 unknown.png

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is this expected behavior??

supple stump Aug 5, 2020, 1:07 PM

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Hi guys, I'm new to AI stuff and I want to use "Rotate to face BB Entry" node, but only "Self Actor" is selectable as the "blackboard key" value ... how can I select another value from my blackboard ?

real spire Aug 5, 2020, 1:15 PM

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Did you associate the blackboard with the behavior tree and create the key you want to reference in the blackboard?

supple stump Aug 5, 2020, 1:25 PM

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Yes, I'm using some key for other nodes

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Oh ... indeed wrong blackboard assigned in the tree ... I forgot i made a copy of the origninal and I didn't updated the value. Thanks 😉

dense halo Aug 5, 2020, 2:24 PM

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hey, does anyone know where I can find the c++ source for the MoveTo BTTask?

tame knot Aug 5, 2020, 2:33 PM

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@dense halo Engine\Source\Runtime\AIModule\Private\BehaviorTree\Tasks

dense halo Aug 5, 2020, 2:37 PM

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thank you

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also, do you know how to make it so that the ai doesn't stop following the target once they reach them?

tame knot Aug 5, 2020, 2:38 PM

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do it in the BT itself

dense halo Aug 5, 2020, 2:40 PM

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📎 Capture.PNG

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i have this right now

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in the simple parallel, my move to task ends while the ai is attacking and it waits until the attack is finished

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I just put a wait node for now but it should take a few seconds to finish the attack (also has a decorator that checks if the enemy is in range for the attack)

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I want it to keep chasing while attacking at the same time

dense halo Aug 5, 2020, 5:12 PM

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anyone know why this isn't working?

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I tried stopping the BTTask_MoveTo calling FinishLatentTask(OwnerComp, NodeResult); but it still freezes until the timer is finished

heavy plank Aug 5, 2020, 5:44 PM

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@dense halo just a small suggestion, even I m going to work on same problem of yours in few days, and I have strategised on how to do it.

Let you AI do moveto task, and you control the attack stuff in AnimBP.

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I believe you should be able to play attack montage.

dense halo Aug 6, 2020, 12:59 AM

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hey is it possible to register observer from BP? in my blueprint BTTask, I want to watch for changes in my blackboard value. I know you can do it in c++ with BlackboardComp->RegisterObserver but I'd like to know if it's possible to do it in blueprint

urban wadi Aug 6, 2020, 1:46 AM

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Anyone know why my nav mesh around my elevator does not work for AI?

dense halo Aug 6, 2020, 5:23 AM

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hey,
I created a BP BTTask which calls "Move To Location or Actor" since that doesn't seem to stop when you reach the goal (here is the task https://blueprintue.com/blueprint/cu3nkazp/)

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but the issue now is that the background node in my Simple Parallel composite doesn't seem to run

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it will only run when I call FinishExecute on my main task

dense halo Aug 6, 2020, 5:40 AM

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so it seems like you can't use the MoveToLocationOrActor node, since that seems to be causing the issue, swap it with the basic move to actor node and that works fine for some reason

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anyone know if there is a reason for this or is it a bug?

lyric flint Aug 6, 2020, 5:49 AM

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what if your still moving the task wont finish execute

dense halo Aug 6, 2020, 5:51 AM

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what?

dense halo Aug 6, 2020, 6:48 AM

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if anyone else wants it, I created a task in blueprint which follows the target non-stop

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https://blueprintue.com/blueprint/vgsr1w9e/

BlueprintUE

BTTask_FollowTarget

#

https://blueprintue.com/blueprint/lvrgbiw9/

BlueprintUE

MoveToTarget

pine steeple Aug 6, 2020, 1:34 PM

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but that is already built in?

honest plume Aug 6, 2020, 3:08 PM

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I am getting insane server lag when I am spawning 200 - 250 AI enemies on the Map?
is there a way to fix it?

stark zealot Aug 6, 2020, 6:08 PM

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How can I make my 4 legged animal ai not be able to rotate in place. I want them to instead do a u turn, meaning they have to move forward in order to turn. Ideas?

pine steeple Aug 6, 2020, 7:09 PM

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don't spawn 200-250 AI based on ACharacter..

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that would use around 20ms game time

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in a non optimized state.

dense halo Aug 6, 2020, 7:41 PM

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@pine steeple the built in one just stops once it reaches the target

pine steeple Aug 6, 2020, 7:41 PM

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not if you do your behaviour tree properly..

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why do you need to keep moving when you reach your goal?

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where is there to move to?

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once your goal starts moving, you start moving

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all done using decorators

dense halo Aug 6, 2020, 7:43 PM

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Because i want it to follow and attack, I did a parallel task for that and I tried it with a decorator, I either had to wait for the attack to finish then start moving or cancel the attack and start moving

pine steeple Aug 6, 2020, 7:44 PM

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don't even need parallel tasks 😄

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then again we force stop our ai before attacking, but that is by design

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originally it was them moving and attacking but we didn't like it

dense halo Aug 6, 2020, 7:45 PM

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Yeah I need my ai to move while attacking

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My non-mob characters will stop to attack but that's cause they do more damage compare to small enemies

pine steeple Aug 6, 2020, 7:47 PM

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https://www.thegames.dev/snaps/L7dcv7bMHj.mp4 this is a while ago, (ignore the attacking whilst too far, that was fixed) lol

▶ Play video

stark zealot Aug 6, 2020, 8:31 PM

#

How can I make my AI not rotate in place like a Sherman Tank and instead do a U-turn in order to rotate? Here's what I have and what I'm trying to accomplish:
https://i.gyazo.com/a33550d7de323f3327346520f9c9c49f.gif
https://i.gyazo.com/5a81d8ec73725a5044551e4787d13a3c.png

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I've lowered the rotation rate which makes it look better but I'd still like to know how to force the AI to move in order to rotate. Pretty much all 4 legged animals would benefit from moving like this. It would look more realistic.

lyric flint Aug 6, 2020, 9:04 PM

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@stark zealot I am not sure if this is the complete answer to your question because it will likely involve a combination of lerp with movement nodes, but this is how i did it - keep in mind you will need to replace forward impulse (i used this on a 6dof space ship enemy ai) with forward movement which involves forward movement code along your X axis mostly likely or whatever the forward vector of the enemy ai pawn is.

📎 unknown.png

#

📎 unknown.png

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a combination of lerp(rotator) and forward movement will get the job done

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do not ever have the rotator directly transition to dest point

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always have it lerp instead, by either using a timer or timeline . this way the transition is gradual

stark zealot Aug 6, 2020, 9:10 PM

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So you're rotating the mesh of the character to slowly rotate towards the target location. Then you're moving the character by adding the impulse to the direction your facing. Why impulse and not movement input?

lyric flint Aug 6, 2020, 9:10 PM

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@stark zealot i am using impulse because it is enemy controlled and not player controlled, and does not take movement input since it's AI. also impulse works on floating pawns it is a specific use case only for flying pawns

stark zealot Aug 6, 2020, 9:12 PM

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Mine's an enemy and I use add movement input and it works. I do it when the enemy is swimming which is basically flying right?

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Either way that way you showed me makes total sense. Thanks. 🙂 I'll work on adding it in.

misty wharf Aug 6, 2020, 9:13 PM

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I'm noticing if you use "Run EQS query" with a behavior tree, I can use "Get All Matching" as the run mode. How exactly is this supposed to work, when I can't have a blackboard key as an array?

lyric flint Aug 6, 2020, 9:13 PM

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Swimming is similar to flying if there is no buoyancy or heavy gravity involved in the water. if you add those additional components to the blueprint to get the physics working right it might add a bit more realism if actually submerged @stark zealot .

And by the way UE4 - Tutorial - Cartoon Water Shader! by Dean Ashford on youtube has a great water material (affected by depth, looks relatively good on surface) if you're interested in colorizing the water.

stark zealot Aug 6, 2020, 9:18 PM

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Awesome! Thanks. I do need that lol. I'm hoping this will make my animals look so much better and less "snappy" and robotic lol

misty wharf Aug 6, 2020, 11:05 PM

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omg 🤦

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I must have spent an hour debugging this behavior tree task

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and the problem was that one of the member variables in the BTT was not being reset... because I thought UE would make a new instance of the task, I was never resetting the variable value

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rip.

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:D

lyric flint Aug 6, 2020, 11:32 PM

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@misty wharf at least now you're a bit more familiar with the BTT flow, right?

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happens to me a little bit when i a simple bool or flag or var was just not set right. but not often. when it does though i do gain better understandings of various pipelines.

misty wharf Aug 6, 2020, 11:32 PM

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lol

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yeah it's just one of those things that happens when you don't know these systems inside out yet

lyric flint Aug 6, 2020, 11:32 PM

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i must have many dead leaves in my BTT for my ai movement

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all the results of experimentation non-compliant

misty wharf Aug 6, 2020, 11:32 PM

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I just kept going again and again through the breakpoints and thinking to myself "none of this makes any sense"

lyric flint Aug 7, 2020, 12:50 AM

#

so a bt_task holds on to its varible?

urban wadi Aug 7, 2020, 2:31 AM

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@pine steeple hey bro do you guys always wait on animations to finish on your AI or do you cancel animations mid attack sometimes? Because I notice that although its a bit more realistic, it also offers quite an advantage for the player to get away if you lure the AI into an attack and run?

stark zealot Aug 7, 2020, 3:30 AM

#

@lyric flint I just wanted to thank you again for helping me with my AI rotation. I got it working and it looks nice. 🙂 I used a timeline to control the alpha for the lerp, then add input to the forward vector like you did and I can easily control the turn radius of my animals now. 🥳

lyric flint Aug 7, 2020, 3:31 AM

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@stark zealot that's good. glad it worked! 🙂

urban wadi Aug 7, 2020, 3:44 AM

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@stark zealot did you do that just for when the animals targeted something?

#

B/C I might be having a similar issue

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My AI just rotates in place and then goes to attack them

stark zealot Aug 7, 2020, 3:49 AM

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It's basically a U-turn I'm forcing them to do before I let them chase the player. Once they finish the U-turn, I let them chase the player. I'm still playing with it now but it seems to work good.

urban wadi Aug 7, 2020, 4:16 AM

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what is it your own task?

lyric flint Aug 7, 2020, 4:17 AM

#

@urban wadi it can be a custom event that calls data, a BTT, or any executor node.

The guidance I gave above was how Whippy was able to implement it so if you are curious how it works my blueprint examples above are the way I was able to accomplish it in my game for my AI - to have the AI gradually turn towards the possessed player pawn and attack the player.

urban wadi Aug 7, 2020, 4:19 AM

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yeah right now mine turns in place and then runs after the player

lyric flint Aug 7, 2020, 4:20 AM

#

so you should:

lerp your AI using a timeline or timer towards your player,
add forward movement
to get it to gradually track your player.

urban wadi Aug 7, 2020, 4:21 AM

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@lyric flint what do you use for rotation while the AI is following the player?

lyric flint Aug 7, 2020, 4:21 AM

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@urban wadi did you see my blueprint code i pasted above?

urban wadi Aug 7, 2020, 4:22 AM

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Yeah here is what I have:

#

📎 unknown.png

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So you don't use the moveTo at all?

lyric flint Aug 7, 2020, 4:23 AM

#

📎 unknown.png

#

📎 unknown.png

#

📎 unknown.png

#

so

#

📎 unknown.png

#

here is the most I can give you @urban wadi

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you would have to use SetWorldrotation

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along with a combination of rinterp to

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i hope that helps. please try to implement my code in the next hour or two and get back to me if you have any further needs. thanks.

urban wadi Aug 7, 2020, 4:26 AM

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Ok can you just tell me why you dont use the built in MoveTo?

lyric flint Aug 7, 2020, 4:26 AM

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you know about the set focus function right

urban wadi Aug 7, 2020, 4:27 AM

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@lyric flint yeah thats what I use

lyric flint Aug 7, 2020, 4:28 AM

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I used rinterpto and setworld rotation insetad of setfocus.

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its funny cause i didn't know about it after i made a task lol

#

📎 UE4Editor_ubwAIEYwd3.png

urban wadi Aug 7, 2020, 4:29 AM

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The only thing I want to create is a rotation towards character while chasing because it just looks a bit jerky so....

lyric flint Aug 7, 2020, 4:29 AM

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i use this task when they are patrolling

urban wadi Aug 7, 2020, 4:29 AM

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@lyric flint I hope you replaced it lol

lyric flint Aug 7, 2020, 4:30 AM

#

yah i know a better way for this code just didn't get around to it

#

📎 UE4Editor_wE3H6DZsjT.png

#

just wanted to show u guys for w/e reason

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it works for like transitions

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cause i can choose to focus after

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so say your ai finds someone then it interps rotation and sets focus

urban wadi Aug 7, 2020, 4:34 AM

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So do you use setfocus and moveTo after you interp rotate towards the player?

lyric flint Aug 7, 2020, 4:34 AM

#

only finishes when interp is complete

#

you can choose to set focus or not

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so i can use this for patroling points

#

actors

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only thing thats not good about it is

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the rotation check

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can be waiting to interp sometimes

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so some other way of checking at the end there for an acceptible rotation

#

better*

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o shit maybe because its checking for 0's lol

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should be checking a float z haha

#

📎 UE4Editor_M3Y49d59nX.png

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anyway to compare to floats with an error tolerance?

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nvm found out

#

📎 UE4Editor_MekomqYG6K.png

patent hornet Aug 7, 2020, 4:59 AM

#

IsNearlyEqual

lyric flint Aug 7, 2020, 5:01 AM

#

this?

📎 UE4Editor_SVeVk9agFP.png

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actually not working my other way was

#

probably because dealing with negative values

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not sure

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📎 unknown.png

#

@lyric flint he was referring to NearlyEqual

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IsNearlyZero2D is a different node..

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ah ill try this

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works saves some math

#

shouldn't i be using actors relative rotation?

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i always use set world rotation.

#

ok well

#

📎 unknown.png

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did you see the code i pasted above..?

#

i have 0 in row and yaw is that bad?

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watch the value in the blueprint and see what the value is.

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like it works fine but was thinking it might be bad

#

📎 UE4Editor_VZnLjbDEOx.png

#

alot better

#

basically want to make it so that based on the rotation distance change the interp speed to be a little more realistic.

little pendant Aug 7, 2020, 1:46 PM

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Hey guys, I'm trying to figure out what to do with a problem I have. I have some pawns being controlled by AI but I have times when there's a sequence running or I want the player to give a command to one of the pawns to do something

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How should I stop the BT from doing stuff?

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Add a playerTurn state of some sort or pause state

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or stop the BT completely

grand atlas Aug 7, 2020, 4:58 PM

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How do you avoid the small stop that the MoveTo causes if the ai is moving to waypoints? I guess I would have to catch that the AI has reached the waypoint before the MoveTo task does, so that it does not have a chance to Finish Execute?
But if the movement is on a 2D grid, I'd really like it to move to the center of the tile. Any tips?

ashen solar Aug 7, 2020, 5:28 PM

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Hey guys, I'm trying to figure out what to do with a problem I have. I have some pawns being controlled by AI but I have times when there's a sequence running or I want the player to give a command to one of the pawns to do something
@little pendant you can run separate behaviour tree and then when it's finished you can run again the original one maybe 🙂

#

hello, just one question. Did "AI MoveTo" node by default always used "bUsePathfinding" or is that new change? P)

lyric flint Aug 7, 2020, 7:10 PM

#

@lyric flint hey

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hey

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you can do navmesh. you had the nav bounds volume with the green field before.

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do this project settings -> engine -> nagivation mesh

📎 unknown.png

#

what does it show for you? paste a screen shot by typing alt printscreen after focusing the unreal window please

#

and then ctrl v in discord

#

I found the setting... Notice to me: i cant search for these setting....

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all right try changing the Agent Radius value there and then deleting and recreating the nav mesh bounds volume

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i set it to 35 like it was sayed before

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what was it before you made it 35?

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34

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Oh ma gosh... it works!! thank you for helping me.. it now moves to me.. 😄

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ah great!

#

cool

lyric flint Aug 7, 2020, 7:41 PM

#

how do i do actions if the player collides with the monster? I dont want to add damage or anything,.. just like on collide

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i only want that something happends if the Player collides with it. not if the monster collides with walls or anything

#

set up capsule components for the overlap and trigger it accordingly. Unreal Engine 4 Documentation > Unreal Engine API Reference > Runtime > Engine > Components > UCapsuleComponent

📎 unknown.png

#

you can set the events there

📎 unknown.png

#

ok

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the problem: how do i define that it should only trigger if the player hits the monster.. it should not trigger when it hits the ground or the wall.

#

you might want to read up on overlap events a bit

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just use actor tags or you can check if it's the player pawn class

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on overlap, check the tag or class

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ok thx

real spire Aug 7, 2020, 9:28 PM

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@little pendant Get the Brain Component from within the AI Controller and use it to Stop Logic or Restart Logic depending on what you need. That should stop/restart the BT.

little pendant Aug 8, 2020, 12:51 AM

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I see, I suppose any BT tasks I wanted to run afterwards I would have to recreate them in the blueprints/cpp class instead. @real spire

real spire Aug 8, 2020, 3:04 AM

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I expect that will depend on your use case. A long, complex sequence of actions might be easier to implement as a separate BT. Or a subtree but I have not digged into those. A simple command from the player might be easier to do Stop Logic -> Run the command through Blueprints/CPP -> Restart Logic

#

Also note I see references to a Pause Logic function in the Ubraincomponent but I’m using Blueprints and that option does not seem exposed, at least not from within a AI Controller event graph

dense halo Aug 8, 2020, 6:25 AM

#

📎 Capture.PNG

#

I'm trying to use the PathExist check in EQS, but it still returns an item for some reason, does anyone know if this is setup properly?

#

📎 Capture.PNG

north willow Aug 8, 2020, 9:47 AM

#

why is the move to not getting called here

📎 unknown.png

#

it just sets the move to location but the enemy doesnt move

static crystal Aug 8, 2020, 10:29 AM

#

when I add a nav modifier to a static mesh actor and enable collision it stops the nav modifier working

📎 unknown.png

#

but if i set collision disabled it works

📎 unknown.png

#

which is weird because NavModifierVolume can have collision enabled and still affects navigation

#

I've tried turning on and off "can ever effect navigation" on the mesh which didn't help. I just want to be able to have a mesh block player pawns but have a weight for ai's

#

Is that possible without having two separate colliders attached to an actor?

real spire Aug 8, 2020, 11:07 AM

#

@north willow you’re using a selector, if the eqs query is successful then I’m guessing that causes the logic to exit your node?

#

Try using a sequence. Or move the other stuff like the EQS inside the composite

junior quest Aug 8, 2020, 11:55 AM

#

Hey all!
(My apologies if the question is very plain)
Rookie over here. Any idea how to implement flying AI following the player? Is it possible to use nav mesh for that?

fallow hound Aug 8, 2020, 12:11 PM

#

Navmesh can't do 3d. You could just have the pawn point towards player and move, of course it wouldn't be able to navigate obstacles

#

There are a couple 3d nav plugins out there but that's kind of heavy for a rookie

junior quest Aug 8, 2020, 12:17 PM

#

Thanks! I was able to find few videos here and there and found similar information.

pine steeple Aug 8, 2020, 12:18 PM

#

we did it using navmesh but we don't actually use full navigation

#

we use pathfinding to create a path

#

and just move it manually

junior quest Aug 8, 2020, 12:46 PM

#

Thanks for the tip. Will look into it 🙂

narrow pier Aug 8, 2020, 9:57 PM

#

📎 unknown.png

#

My behaviour tree looks like this currently, I want to run the FindClosestPointOnSpline once and have the MoveTo and GetNextLocation Running in a loop, but atm all of them run in a loop. How would I fix this?

pine steeple Aug 8, 2020, 10:12 PM

#

use a decorator

#

if you found a point, don't run the FindClosest point on spline

#

and that should be a selector

#

Root -> Selector -> FindCclosestPointOnSpline put a decorator on it, so when it has the closest point, dont run it again, then have a sequence

#

https://www.thegames.dev/snaps/mspaint_F8fak8VfIt.png

narrow pier Aug 8, 2020, 10:40 PM

#

ah alright I see, that seems to do the trick

#

thanks

dense halo Aug 9, 2020, 12:44 AM

#

does anyone know why the move to task fails if you jump from a high height?

#

I have enabled partial-path, so if I go on top of a box that is quite height, the ai will move next to the box but if I jump off the box before the ai get's near the MoveTo fails

supple stump Aug 9, 2020, 1:18 PM

#

Hi guys, What is needed to make the AI use strafe movement ? Is there any built in stuff for that ?

wide mirage Aug 9, 2020, 2:12 PM

#

No i don't believe so

#

But there is a way to do it

#

One way could be getting the right vector of an actor

#

and having them move to that location

#

I would use a line trace

#

And it could be any kind of foward and backwards strafing

supple stump Aug 9, 2020, 2:16 PM

#

well I'm trying to get right vector of my AI pawn but ... it doesn't "stick" to the actor rotation. So if my AI rotate, his right vector remain at the same position...

wide mirage Aug 9, 2020, 2:16 PM

#

I see what you mean

#

You want him not to rotate when strafing

#

Or you could just have the AI rotate towards the actor while strafing

#

But i haven't used it in a while

#

so i'm not sure

supple stump Aug 9, 2020, 2:18 PM

#

Do you know the vector operator to use to add the actor rotation to the right vector ? I suck so much at math :p

wide mirage Aug 9, 2020, 2:19 PM

#

No im not much of a math person myself too

supple stump Aug 9, 2020, 2:19 PM

#

héhé 🙂

wide mirage Aug 9, 2020, 2:19 PM

#

But the concept is there

#

Atleast

midnight scroll Aug 9, 2020, 7:01 PM

#

@supple stump AIControllers and some movement types have strafe booleans.

supple stump Aug 9, 2020, 7:02 PM

#

Yeah I managed to do strafing by manipulating "Orient Rotation To Movement" and "Use Controller Desired Rotation" nodes

bronze shuttle Aug 9, 2020, 8:17 PM

#

Hello. I have a general architecture question. I have an idea of what I need to do, I just don't know the right place to put the logic for what I'm doing.
I have a fleet of ships, each with their own behavior. They can move in formation with each other, or break formation based on nearby enemies. When they fly, they can't just go directly toward the target. They have to steer toward a target. When in formation, they are controlled via forces (much like the boids algorithm) so there isn't a target.

That being said, what should "own" the actual movement logic? The base AIController has a MoveTo, but that is only via NavMesh or directly flying toward a location. I could do it in tasks, but when attacking I also want to continue flying. Or should the movement be handled in a component in the ShipPawn? I've attached a diagram of my objects with their roles.

📎 arch-sketch.png

patent hornet Aug 9, 2020, 8:31 PM

#

You should have a Custom MovementComponent on the Pawn

#

I would not move the ship from BT, just decide where it should go and pass it on

#

Probably by having a MoveTargetActor for the ship

bronze shuttle Aug 9, 2020, 8:33 PM

#

Ok gotcha. And I'm guessing if it is following an actor, just give it the actor reference and let it update the position on tick?

patent hornet Aug 9, 2020, 8:33 PM

#

And just teleporting it around

#

If you want to follow another ship

#

You attach it to it

#

If you want formation, you just teleport it to formation goal with ships formation offset

#

You can put additional logic onto it, to show goal particle, or to have acceptable range in it

#

Your movement component can also handle avoiding collisions and such

bronze shuttle Aug 9, 2020, 8:46 PM

#

Gotcha, that makes sense. I'll try that out. Thank you!

gray willow Aug 9, 2020, 10:23 PM

#

is it possible to use arrays in blackboard
like my eqs should return an array of objects
but i dont see an array option in blackboard variables

pine steeple Aug 9, 2020, 11:21 PM

#

no

gray willow Aug 10, 2020, 12:30 AM

#

lol

eager blaze Aug 10, 2020, 4:31 AM

#

yo does AIPerception suck or have I just been using it wrong the entire time
"Team A" AI and "Team B" AI fail to see each other half the time, and when they do see each other it's usually after they've already ran past each other then they turn around and run back towards each other to attack which looks dumb as hell

#

the sight radius is 1,500 and the peripheral vision is 180°, they follow identical paths but from different directions, so they bump into each other 100% of the time but AIPerception only kicks in less than half the time

lyric flint Aug 10, 2020, 4:36 AM

#

i'd like to see that 🙂

gray willow Aug 10, 2020, 5:45 AM

#

yea send a video

#

that sounds very

#

uh

#

like ur doing smth wrong

#

lol

simple crest Aug 10, 2020, 7:42 AM

#

If you have enough AI the perception system will behave like that. You might not be crazy

floral mango Aug 10, 2020, 8:02 AM

#

yeah it's timesliced, so if you have lots of agents you can end up with a long day between individual agents getting updated

north willow Aug 10, 2020, 9:47 AM

#

I may have changed a weird setting but my AI no longer moves to target even though it is getting called

#

and the target location is not invalided

supple stump Aug 10, 2020, 10:05 AM

#

Hey guys, How can I retrieve the result of a BTTask from an attached BTService ? I just want to know if my task was successfully executed without storing this in the Blackboard if possible.

robust valve Aug 10, 2020, 10:56 AM

#

Hello guys, I'm trying to have my AI to automatically start running when the game begins, i want the AI to be able to dodge obstacles on its own ie to jump or slide when it detects an obstacle in its path. What is the best way to go about this? Any recommendations would be highly appreciated. Thanks

lyric flint Aug 10, 2020, 10:59 AM

#

hm, with the less than basic knowledge I have, you need to make the Behaviour tree with running state for the AI and connect it to the idle or detection state so it turns to run to the player after it sees him/her

#

or the obstacle

#

you need to determine the height of the obstacle and the position of the AI relative to the obstacle

#

that is in theory

robust valve Aug 10, 2020, 11:01 AM

#

hey thanks for the reply. the A.I is running from the player in an endless level

#

do you have any tutorial recommendation i may look at?

lyric flint Aug 10, 2020, 11:04 AM

#

did you check Virtus Hub?

#

they recently changed their channel name, but they make good tutorials

#

also Ryan Laley makes good tutorials too

robust valve Aug 10, 2020, 11:22 AM

#

checked em out already, anyway thanks for your help, have a good day!

lyric flint Aug 10, 2020, 11:31 AM

#

no problem, you have a good day too

eager blaze Aug 10, 2020, 5:08 PM

#

If you have enough AI the perception system will behave like that. You might not be crazy
@simple crest
yeah it's timesliced, so if you have lots of agents you can end up with a long day between individual agents getting updated
@floral mango

thanks, i feel this might be the issue since it only seems to occur after more AI are spawned over time. am i going to have to make my own AI perception system? or is there a way to work around this with the built in AIPerception?

worldly mural Aug 10, 2020, 8:14 PM

#

How could I add a turning curve for an AI?

#

Currently my AI just "teleports" to face its walking direction

#

But I want it to walk around in a circle to face its walking direction

#

Here's a terrible paint drawing showing what I want:

📎 unknown.png

#

The brown is what the AI does currently, when facing in the direction of the gray arrow

#

While the black line is what I want the AI to follow to reach its direction

#

Red dot is the AI, blue dot is the target location

eager blaze Aug 10, 2020, 10:56 PM

#

@worldly mural have you tried enabling use controller desired rotation, and disabling use controller rotation yaw

worldly mural Aug 10, 2020, 11:12 PM

#

Yeah

#

@eager blaze That just rotates the mesh slowly

#

But the traveling direction will still be that brown line

eager blaze Aug 10, 2020, 11:13 PM

#

oh so you want it to actually circle around, not just turn around

worldly mural Aug 10, 2020, 11:17 PM

#

Yeah

#

Exactly

#

I have no idea how

#

Completely stumped

#

@eager blaze

worldly mural Aug 11, 2020, 12:07 AM

#

I've spent days trying to figure this out

#

The current look just doesn't look good at all

#

It looks so bad

#

Another example is if you've played ARK, the dinosaurs in the game have a turning radius

lyric flint Aug 11, 2020, 12:46 AM

#

@robust valve https://www.youtube.com/watch?v=M4WVRdbh_VM

#

be sure to subscribe to my boy

eager blaze Aug 11, 2020, 1:54 AM

#

@worldly mural try to set a maximum angle they can turn at once, per x metres of walking

#

it'll involve some maths im unaware of

verbal violet Aug 11, 2020, 1:33 PM

#

Hi people, i just added new collision layer "player" and set it on player capsule, but he always drop through floor. default value for new channel is Block. How to add channel to replace Pawn layer with Player, without this? I need that to separate collision with enemy weapons

patent hornet Aug 11, 2020, 2:08 PM

#

i found CMC reacts... badly when the Characters collision type is not Pawn

#

so unless you feel like going through its 13000 lines of code and fixing stuff that prevents you from changing the capsule's ObjectType, i suggest finding another approach

simple crest Aug 11, 2020, 2:25 PM

#

Starting to learn EQS. Trying it out to generate cover points. Just wondering has anyone come up with a clever way to check if points are "fully" obscured? Like if EQS picks a point near a corner, the player can still shoot the character's arms sticking out

#

I guess right now I'm just thinking of running a couple extra casts to the left/right of the point, not sure how else it could be done

fallow hound Aug 11, 2020, 2:33 PM

#

that seems like an allright way

tough helm Aug 11, 2020, 4:54 PM

#

hey what's the go to way of implementing optional steps in a sequence?

for example I want a sequence that does voiceline, unholster gun, moveto
but the unholster is optional
should I just use force success? I would like the sequence to continue even tho decorator failed, since the task itself didn't fail

fallow hound Aug 11, 2020, 5:07 PM

#

yeah you could have the task return success if it wasn't needed @tough helm

#

if you named the task like "Ensure Armed" it even makes sense

#

or "Unholster if possible"

real spire Aug 11, 2020, 5:09 PM

#

Yeah. As long as the Finish Execute has Success ticked then it doesn't matter what happens inside the Task.

#

Do make sure all branches in the flow are connected to the Finish Execute, regardless of their meaning in terms of the gameplay

tough helm Aug 11, 2020, 5:17 PM

#

oh so instead of a decorator do the branching inside the task itself?

real spire Aug 11, 2020, 5:23 PM

#

Yeah

#

Decorators are more for keeping the logic from hitting the branch or throwing the logic out of the branch

vale bramble Aug 11, 2020, 7:05 PM

#

is it possible to set the location of either the left or right point in a nav link through blueprints?

#

nevermind i got it

#

you can

worldly mural Aug 11, 2020, 9:14 PM

#

Whats the best way to add steering behaviors to my AI?

#

This is the one I'm looking at: https://gamedevelopment.tutsplus.com/tutorials/understanding-steering-behaviors-seek--gamedev-849

Game Development Envato Tuts+

Understanding Steering Behaviors: Seek

Steering behaviors aim to help autonomous characters move in a realistic manner, by using simple forces that are combined to produce life-like, improvisational navigation around the characters'...

#

Its a seek steering behavior

#

It shows you the math on implementing it

#

But I have no idea where I would do this math in UE4

vale bramble Aug 11, 2020, 11:19 PM

#

How can I call the "Copy End Points from Simple Link to Smart Link" event in a nav link proxy through blueprints?

#

or just set the location of the smart link points through blueprints

hexed palm Aug 12, 2020, 9:32 PM

#

Hey guys, what is the limit of AI simulation that can take place at once, and what would be the best way to handle alot of AI at same time, like 2000 AI at once ?

inland umbra Aug 12, 2020, 10:42 PM

#

What kind of AI are you talking about?

pine steeple Aug 12, 2020, 11:44 PM

#

why would you have 2000 ai on screen at the same time?

#

you would need to do a ton of optimizations

patent hornet Aug 13, 2020, 2:05 AM

#

like not using pathfinding, crowd avoidance, characters, or CMC

floral mango Aug 13, 2020, 10:20 AM

#

you won't manage 2000 at once with the out of the box AI systems, you'll need to at least heavily modify them or more likely write your own.

tough helm Aug 13, 2020, 11:52 AM

#

hey, tag cooldowns are scoped to single AI controller or shared between all?

pine steeple Aug 13, 2020, 12:56 PM

#

why would they be for all?

tough helm Aug 13, 2020, 3:48 PM

#

that's why i'm asking ¯_(ツ)_/¯

#

so i guess they're not

#

trying out run dynamic subtree

#

but even if I put breakpoint into SetDynamicSubtree, it changes the asset, but default is still played, then on next change of the subtree it's default again

#

does it reset on restartlogic or something?

#

ah it does, so I need to inject it AFTER it becomes relevant

pine steeple Aug 13, 2020, 4:07 PM

#

yes

#

you need to inject at the correct times

crisp delta Aug 13, 2020, 7:14 PM

#

Anyone have any suggestions on optimizing AI MoveTo nodes or something similar? I have 12 AI characters on screen, walking towards me, and when they do, there is a fps decrease of roughly 20-30 fps

fallow hound Aug 13, 2020, 7:19 PM

#

I would start by figuring out the source of the performance drain

#

you can use unreal insights or stat startfile

#

because it could be pathing, or it could be the character component, or it could be the anims, or it could be other things

#

for a new person stat startfile is probably easier

#

https://www.unrealengine.com/en-US/blog/how-to-improve-game-thread-cpu-performance

Unreal Engine

How to improve game thread CPU performance in Unreal Engine

Is the frame rate in your game low? Do you know why? Could it be because you have too many enemies spawned at once or is it because one specific enemy is expensive? Could it be because you have a ton of visual effects or because of that sweet skill system you wrote? Read on to...

crisp delta Aug 13, 2020, 7:26 PM

#

@fallow hound Each CharacterMovementComponent takes 100ns

#

i mean .100 ns

fallow hound Aug 13, 2020, 7:26 PM

#

thats not much

crisp delta Aug 13, 2020, 7:27 PM

#

📎 Capture.PNG

#

But then multiply that by 12 actors

fallow hound Aug 13, 2020, 7:27 PM

#

yeah so like 1.2 ms, which is a chunk but thats about right for char movement comp

#

I'm no pro at optimizing cmc, maybe post that in #cpp for insight?

crisp delta Aug 13, 2020, 7:28 PM

#

Roger. Appreciate it

pine steeple Aug 13, 2020, 10:28 PM

#

we run around 120 AI

#

and cmc/pawn/ai controller is around 4ms

#

but that is the budget

prisma lake Aug 14, 2020, 12:59 AM

#

Have you guys had good results with DetourController and RVOAvoidance? It's buggy for me and doesn't scale past 40~. I'm trying to make a multiplayer strategy game with up to 100 units, but the engine doesn't seem to be able to handle it out of the box.

I setup floatingpawn system with custom net-smoothing, it all works well enough with 100's. Problem is, units are moving through each other and standing on each other. I hate to switch to the CharacterMovementC since my game doesn't need it....Would appreciate some guidance, and can pay for some consultation. 30-50 an hour.

pine steeple Aug 14, 2020, 1:21 AM

#

you can't use both together

#

and i found both of them pretty terrible

prisma lake Aug 14, 2020, 1:23 AM

#

Yeah same

#

So what do you do for crowd pathing

#

My only thought is flexing the game design to allow but punish movement through other pawns, but this presents lots of little problems

#

it's kind of frustrating that Epic seems so apathetic about supporting the RTS genre, the engine features are so weak at accomplishing RTS movement that was mainstream 20 years ago, and I'm not even talking about the bandwidth problem

midnight scroll Aug 14, 2020, 6:34 AM

#

I don't find RTS stuff that hard to program. I'd really rather Epic remain apathetic towards creating tools that users can easily make themselves and continue to refine the amazing engine they've created. I don't think that they're apathetic to RTS so much as apathetic towards the idea of creating too many native classes that not every project needs/wants. Epic has done a lot to simplify programming and make it extremely easy to rapidly develop things safely for even non experienced programmers so creating your own movement avoidance shouldn't be too hard.

patent hornet Aug 14, 2020, 7:23 AM

#

what are your Pawns @prisma lake ?

#

@midnight scroll Epic made it easy to develop a fast prototype, but writing code that holds up to production standards isn't easy or rapid

prisma lake Aug 14, 2020, 11:56 AM

#

@patent hornet it's a fantasy RTS like AoE2 but with smaller unit counts, they're pawns using floating pawn movement and the navigation system with a normal AIController

#

https://tenor.com/view/no-randy-jackson-dawg-gif-12730917

#

@midnight scroll They already made Avoidance and a Navigation system and put them in the engine. They just don't work. AFAIK, nobody uses these systems in production ready games, even Epic doesn't use them without significant modification. They're buggy and jumpy and unreliable.

patent hornet Aug 14, 2020, 12:17 PM

#

and if navmesh is dynamically generated

#

crowd avoidance isn't just bad, its downright broken

visual tendon Aug 14, 2020, 4:53 PM

#

hello, i have problem with drag and drop. i use it with my inventory and it works fine, but only after clicking on inventory panel. I open inventory, click on panel and drag and drop works. I want to make working drag and drop exactly after opening inventory panel

#

i tried setFocus on inventory panel, but nothing changes

#

Set Input Mode Game and UI solved problem

light kindle Aug 14, 2020, 5:12 PM

#

Is there any way to switch the type of/between a selector/sequence nodes in BTs? Sucks to always create the other type and drag&drop all decorators one by one to the new node and reconnecting everything.

Feels like this should be a simple context menu feature.

low oak Aug 14, 2020, 5:15 PM

#

hi all my AI is keep shaking went moving and turning in multiplayer mode

#

is that shake because of the client position not sync with server

#

I just use simple behavior tree and use move to node, it still shaking when move

pine steeple Aug 14, 2020, 6:28 PM

#

using crowd avoidance?

#

cause i had that issue with it

urban wadi Aug 14, 2020, 11:53 PM

#

@pine steeple is there a way to have an AI work on a dynamically moving platform? ie) elevator

#

I have the elevator inside a nav mesh but it does not work

formal wing Aug 15, 2020, 2:56 AM

#

Hey everyone!

I'm familiar with UE, but only recently started diving into behavior trees and AI. I could do stuff with blueprints, but I know that, for reasons, it's better to use a behavior tree for AI for any kind of complex behavior. My issue is that, while I'm starting to get the hang of doing things in a BT, the way things are executed make sit seem like there are very rigid edges between tasks. I'm simply trying to get a character to move between waypoints without stopping. Instead what happens is the character will reach his destination, complete the move, the behavior tree will go back up to the root, and then fire back down to the move task, starting movement again after a brief pause.

I've tried numerous things so far to no avail. I've tried updating the location early and firing the Move To ahead of time to try to make it seemless, but it seems like the issue is the behavior tree stopping, going up to the root, and then heading down the chain again, which is making me think I'm missing something fundamental about behavior trees.

#

📎 unknown.png

#

I have the decorators on there for abort purposes. Other than that, I feel like I've tried everything except the right way, even making my own Move To task that will automatically increment waypoints for me as they're reached. At a loss of what to try next.

midnight scroll Aug 15, 2020, 8:17 AM

#

@formal wing If I'm understanding right, you seem to have a bunch of different points you want this AI to move to in sequence assuming that the AttackTaget isn't set? If that's the case, the easiest method would be to update your one MoveToLocation based on their distance to it and tell the MoveTo node to watch that variable. Make a service that'll take your many points and ask if the character is close enough to the current target? Then remove that from the desired locations and select the next one and change MoveToLocation to that target. Your moveto node should automatically change it.

low oak Aug 15, 2020, 1:31 PM

#

when I try to use move To Node , It will keep shaking on client when the player keep strafing to left or right, as the AI keep rotating and face the player, it will keep shaking on client . I just wondering the AI rotation is not sync with server cause the shaking behavior when rotate face to player

#

I already untick Orient Rotation to movement and use controller desired rotation

lament linden Aug 15, 2020, 4:34 PM

#

@formal wing You can use the Loop decorator on your MoveTo or the Sequence so the execution won't go up the root.

lament linden Aug 15, 2020, 4:50 PM

#

Hello people,
I'm trying to organize my Behavior Tree's a bit, and I want to use the "Run Behavior" task that allows me to run other behavior trees from my main behavior tree. I tried to use it, but the problem is I cannot access the Blackboard of the Subtree that I'm running inside my main Behavior Tree.
Before I was able to access the Blackboard through the AI Controller, but this subtree only seems to exist inside the main behavior tree.

How can I access and update the blackboard of this subtree?

#

📎 bt.png

hoary peak Aug 15, 2020, 4:55 PM

#

I'm probably dumb, what do you mean?

lament linden Aug 15, 2020, 4:57 PM

#

Through the AI Controller, I can access and update the blackboard of this behavior tree in the picture. But I cannot access the blackboard of the behavior tree that I run using "Run Behavior" because that behavior tree is not bound to my AI Controller (using Run Behavior Tree).

hoary peak Aug 15, 2020, 4:59 PM

#

You should maybe consider using Blackboard inheritance in that case, if it does make sense to that is

#

Or store those specific values inside the AI controller instead

lament linden Aug 15, 2020, 5:01 PM

#

But how would I pass them to the BT_AIEnemyCombat Behavior Tree?

hoary peak Aug 15, 2020, 5:02 PM

#

I don't understand, what type of value do you need to pass?

lament linden Aug 15, 2020, 5:02 PM

#

Let me explain the logic I'm trying to go for and maybe you can suggest a better workflow

#

I have a main behavior tree that uses the main blackboard. It should store general variables about the AI, like its state (Attacking, Patrolling etc.)

Other behaviors, such as Combat, should be handled under another behavior tree, because those are complex. That's why I want to call Run Behavior and use a behavior tree specifically made for combat. But to do that, I need this **combat behavior tree **to have its own blackboard, lets call it combat blackboard. This blackboard will store data about the combat, like the focused actor, or the location of that actor, the equipped weapon, etc and it will decide on which behavior to run based on these values.

The problem is, I cannot use a separate blackboard for the combat behavior tree because I couldn't figure out how to access it. I can access the main blackboard through the AI Controller, because I set that as follows:

#

📎 bb.png

#

I can't do the same thing for the combat behavior tree and therefore I have no way to access its blackboard.

strong plover Aug 15, 2020, 5:18 PM

#

I'm not super familiar with AI specifically in unreal, unfortunately, @lament linden. I know you summoned, and while I wish I could offer more... all I have is "I believe in you! You got this!" and all the enthusiasm I can muster 😄

lament linden Aug 15, 2020, 5:19 PM

#

Ahahah 😄

#

Thank you the morale boost is enough

strong plover Aug 15, 2020, 5:19 PM

#

I'm glad. haha

#

Normally with AI, I hire out. lol

lament linden Aug 15, 2020, 5:20 PM

#

Definitely won't hire me then 😄 😄

strong plover Aug 15, 2020, 5:22 PM

#

It's all just a matter of digging in and poking until it works. AI, I feel, is upward failure lol

grand atlas Aug 15, 2020, 5:29 PM

#

The only way I have gotten a subtree to work, is by it using the same BB as the main tree.
What I tested now was to use the Run Behavior Tree (the BP node in AI Controller, like you do on begin play), with a BT with a different BB. And that works.

lament linden Aug 15, 2020, 5:33 PM

#

If I use the same BB as the main tree, I think the BB values are shared, right?

grand atlas Aug 15, 2020, 5:33 PM

#

Yes

lament linden Aug 15, 2020, 5:33 PM

#

Even if i didn't check instance synced

#

It was shared

#

But I really don't want to lay out all of the variables inside one giant blackboard 😄

grand atlas Aug 15, 2020, 5:37 PM

#

yeah, well I agree with that part.
But then you have to run a completely different BT, so you lose out on the decision making of your main tree. Then again, that might be a good thing. If you combine BTs with state machine, let your state machine make the decisions and the BTs do the behavior.
https://youtu.be/Qq_xX1JCreI?t=1772

YouTube

GDC

AI Arborist: Proper Cultivation and Care for Your Behavior Trees

In this 2017 GDC talk, Bobby Anguelov, Mika Vehkala, and Ben Weber outline core principles to get the most out of your behavior trees while avoiding common issues.

Register for GDC: https://ubm.io/2yWXW38

Join the GDC mailing list: http://www.gdconf.com/subscribe

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▶ Play video

lament linden Aug 15, 2020, 5:40 PM

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Let me watch this 😄

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@grand atlas I watched this thinking this was an UE4 talk

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But it wasnt ahahah

grand atlas Aug 15, 2020, 5:52 PM

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Ah, no but in principle.
Well, that's all I can contribute really. Still learning AI myself.

lament linden Aug 15, 2020, 5:55 PM

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Wish the engine had better documentation on these things

crisp delta Aug 16, 2020, 12:59 PM

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@analog mural what is that Is valid node attached to on input

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Well your issue is with casting to the playercontroller

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Why are you casting to it anyways

pine steeple Aug 16, 2020, 1:12 PM

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if you are doing a topdown game moving an AI controlled pawn, you need to do a bit of setup

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only one controller can possess a pawn (and this would be your AI controller)

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so you would need to have a property holding your PlayerController seperately

real spire Aug 16, 2020, 2:18 PM

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If you want the AI to turn towards a specific target, try Set Focus. If you want to use a specific location, try Set Focal Point.

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Bear in mind these two nodes require a AI Controller as a target. If you use them from inside the controlled AI Pawn, you must Get AI Controller and connect that. If you call them from within the AI Controller, you can leave the target input as Self

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Inversely, if you need to get a reference to the Controlled Pawn from within the AI Controller, you can use Get Controlled Pawn from inside the "Pawn" section of the Actions list. Despite the tooltip saying this is to get the pawn controlled by a Player Controller, the input accepts the Controller class - a class that is parent to both Player Controller and AI Controller

swift bolt Aug 16, 2020, 4:13 PM

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Not sure if AR question or AI question but Generate Nav Mesh For Mesh Data doesn't seem to work but honestly I'm not sure if ti does what I think it should do, which is generate nav mesh for mesh data calculated on an AR device.

real spire Aug 16, 2020, 6:41 PM

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Yes, in the case of the specific nodes I mentioned you need to plug in a AI Controller because what drives the logic of the Set Focus node connects to a AI Controller. It cannot interact with a Player Controller or interact directly with a Pawn. So it goes like this: Set Focus -> AI Controller -> Pawn

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That is the case for a lot of "AI" stuff like the Behavior Trees

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What the Set Focus does is tell the AI Controller it's controlled Pawn should face the direction of the Focus

cinder ridge Aug 16, 2020, 8:15 PM

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Anybody figured out an efficient way to spawn/move NavMeshBoundsVolume on a large procedural world? Everything I find online is either for an old version and doesn't work anymore, or is buggy.

prisma lake Aug 16, 2020, 9:48 PM

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pretty sure you can't ever move a navmesh volume

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you might need nav invokers

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or level streaming

cinder ridge Aug 16, 2020, 10:28 PM

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I can move it and then re-invoke the navigation system, but it doesn’t update the full volume, only a single quad. I just realized I’m moving it on Tick for testing though... so maybe it just doesn’t have enough time to mesh more than the first square

cinder ridge Aug 16, 2020, 10:45 PM

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Doh, that fixed it. If you keep calling NavSystem->OnNavigationBoundsUpdated(NMBV); it will never finish

cinder ridge Aug 16, 2020, 11:16 PM

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In case anyone is looking for how to in the future:

📎 unknown.png

misty wharf Aug 17, 2020, 3:10 AM

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I wish you could save BT state

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one of the nice things about using BTs at least to me is that I can easily set up sequenced tasks... but if I have to be able to load/save state that's not really gonna work

urban wadi Aug 17, 2020, 3:12 AM

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@pine steeple when your Ai is not facing the target, do you just rotate your AI in place and then chase or do you rotate your AI over a specific distance to make it more fluid looking as opposed to robotic?

misty wharf Aug 17, 2020, 8:02 AM

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Is there some way to find out why an AI MoveTo is aborted? I'm working on some game load stuff, and if I try to immediately move an actor as they get loaded in and possessed by a controller, it seems to get aborted

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Adding a delay fixes it... but it feels very dirty to add those kinds of workarounds lol

lyric flint Aug 17, 2020, 11:01 AM

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@zomg "save BT state" - are you talking about typical properties? Pausing execution?

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I'm sure that's possible

flint trail Aug 17, 2020, 6:32 PM

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folks, does UE 4.25 have nav system v2 already enabled?

swift bolt Aug 17, 2020, 6:33 PM

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Learning about Navigation Invoker from here https://www.youtube.com/watch?v=QNHInJJ1vUk

YouTube

Mieszko Zielinski

Navigation Invokers

An original video I've put together for internal use to describe Navigation Invokers feature, dated Jun 18th 2015 but recorded months before that because, as you might notice, I refer to the feature as "Active tiles" was my own temp-name while working on the feature, pre UE4 v...

▶ Play video

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The system is on but navigation is still building regardless of if there is an invoker there or not

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Based on that video I shouldn't see any green unless there is an AI with a NavigationInvoker component to invoke the generation

hollow prism Aug 17, 2020, 7:58 PM

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This may be slightly impossible, but does anyone know how to create AI navigation that can also go around loops and up walls? I know there is a 6DOF plugin for UE4 that works for flying, but I'm not sure if it's easier to modify it to stick to surfaces or to make a new navmesh generator somehow.

inland bronze Aug 17, 2020, 8:42 PM

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@hollow prism the way we do that is by not relying on navmesh for that type of movement but rather movement lerp transforms; the controller simply chooses whether to continue requesting transform lerps or "detach" from surface

hollow prism Aug 17, 2020, 8:48 PM

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I see... it would behave similarly to a "roomba" and only check what is close. That could work for our fan game since we're making enemies that can follow the character as they run through loops, up 90+ degree slopes, and possibly across jumps too. It wouldn't have to work at large distances.

urban wadi Aug 17, 2020, 10:22 PM

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Is there anyone in here that can show me how to set up my turning animations in unreal engine? I have added my idle, run, and attack animations but I don't know how to set up my turning ones.

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Or a tutorial. I have a turn left animation, turn right animation, a run_turnLeft animation, and a run_turnRight animation'

random jay Aug 18, 2020, 12:31 PM

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Just started working on an AI for my game.
Does anyone have any experience with the best practives/pitfalls of behavior trees?

fallow hound Aug 18, 2020, 12:42 PM

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best practice for a beginner is to warch every epic video with mieszko

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also the AI State of Mind video is good

random jay Aug 18, 2020, 12:47 PM

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Thanks I'll check him out

random jay Aug 18, 2020, 1:07 PM

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@urban wadi checkout ALS (free on marketplace) they have an implementation turning anims (+ you can use those anims)

verbal violet Aug 18, 2020, 3:14 PM

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Is i t possible playing montage with enabled root motion fuck up other root animations ? I have two melee attacks, regular and rush (from run) and both works ok until happend stagger which is also root motion animation BUT I am play it as montage, after that melee attacks beahve like root motion is disabled (slide/move legs in place)?!

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all animation sequneces has EnableRootMotion enabled

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AnimtionBlueprint has RootMotionMode - Root Motion from eveything

urban wadi Aug 18, 2020, 6:30 PM

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Is there a way to make an AI bit spin in place like this?

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📎 2020-08-18_14-05-53_Trim.mp4

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I want this to look more natural

ivory violet Aug 18, 2020, 7:34 PM

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Is there a way to make an AI bit spin in place like this?
@urban wadi do you have turn animation for the character?

urban wadi Aug 18, 2020, 7:39 PM

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yes i do. Maybe I have implemented it incorrectly on the blendspace

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I am using a behavior tree that rotates to face player when in sight

ivory violet Aug 18, 2020, 8:12 PM

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yes i do. Maybe I have implemented it incorrectly on the blendspace
@urban wadi did you try playing it in Animation Blueprint as TURN state when the character is not moving but rotating?

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Or you can play animation in custom task that rotates character towards player

urban wadi Aug 18, 2020, 8:55 PM

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@ivory violet I have thought about that approach. Working on it now. Which do you think would be a better solution?

real spire Aug 19, 2020, 1:14 AM

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The Set Focus node will make the AI attempt to look towards a given actor.

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Then you can Clear Focus when you don't need the behavior anymore

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Both use the AI Controller

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Not a fix for animation issues but an easy to get that behavior when needed

supple creek Aug 19, 2020, 5:38 AM

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no matter how small I put these settings, I can't get it to path through a 25uu space

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📎 unknown.png

ivory violet Aug 19, 2020, 6:38 AM

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@ivory violet I have thought about that approach. Working on it now. Which do you think would be a better solution?
@urban wadi I think using animation blueprint would be better. I tried once playing over custom task and animation montage, but sometimes it caused issues as montage can interrupt other stuff that is not so easy to pinpoint.

urban wadi Aug 19, 2020, 6:52 AM

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@ivory violet sounds good. Do you do your attack animations through Anim BP too?

ivory violet Aug 19, 2020, 7:03 AM

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@urban wadi nop, those I do from character blueprint with animation montages. So far its working good and I never had any problems with it

urban wadi Aug 19, 2020, 7:04 AM

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good thats what I do. I am still having issues with my turning animations, but I am going to work on some more BT stuff I guess I will go back to it

ivory violet Aug 19, 2020, 7:06 AM

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@urban wadi thats causing me a lot of problems too, its gonna take some tweaking and good turn animations to do it right

urban wadi Aug 19, 2020, 7:08 AM

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yeah problem is I dont think my turn animation is even working in my blend space. I will just have to figure it out

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its weird because my idle and run are working

high summit Aug 19, 2020, 8:04 PM

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what is difference between pawn sensing and ai perception

pine steeple Aug 19, 2020, 8:46 PM

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ai perception is newer

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pawn sensing is older, and has less features

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@high summit do you actually care for rules? you posted the same question in multiple channels again.

wild plover Aug 19, 2020, 10:40 PM

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Hello. I'm using a simple behaviour tree. When i play a montage (with [play animation] node) it work well. but if i check the parameter "non blocking", my character goes to Tpose instead of the idle. i dont understande the logic behind this

paper sparrow Aug 20, 2020, 12:30 PM

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Which is the correct 'Move To' command to use in BT Tasks?

📎 unknown.png

thorny jay Aug 20, 2020, 1:35 PM

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Hi everyone. I want to create a service in my behaviour tree to determine if the AI should try and melee the enemy. The basic logic is to go into melee if the enemy is close enough, but my AI also needs to defend walls, so I don't want the AI to start jumping down from the wall once the enemy reach the base of it

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I thought about using FindPathToActorSynchronously to basically say that they should only go into melee if there is a short path to the enemy

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But the problem is that it absolutely kills performance when I have 20 defenders

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Even on my 7700k, I get awful 100ms hitches every time it runs

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Is there a better way I could test to see if the enemy is directly reachable?

real spire Aug 20, 2020, 5:30 PM

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Since the SI is on a wall, higher than the enemy. Maybe calculate the difference between their Z locations and only let the AI go into melee with the enemy if the difference in Z is within a certain bound

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*AI, not SI

thorny jay Aug 20, 2020, 6:14 PM

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@real spire interesting idea, ill give that a try. Thanks!

urban wadi Aug 21, 2020, 1:54 AM

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I have a quick question. Does anyone here use multiple colliders on certain AI characters? For example if you have a dog do you have multiple colliders like a capsule collider for face, feet, and body in order to make sure that it doesn't clip through objects in the game.

woven sleet Aug 21, 2020, 7:57 AM

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not sure if this is the right sub, but I am having issues with my navmesh constantly being rebuild, even if I just add a new custom event to an actor. Any ideas how to resolve this?

ivory violet Aug 21, 2020, 10:30 AM

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I have a quick question. Does anyone here use multiple colliders on certain AI characters? For example if you have a dog do you have multiple colliders like a capsule collider for face, feet, and body in order to make sure that it doesn't clip through objects in the game.
@urban wadi the less collision the better for me. Make one approximate, I cant think of situation where you would do more, even some big games have some clipping, its just too hard to make it perfect. But if you want to use different collision for etc. to be able to shoot character in the head or foot, take a look at Physical Asset, there are capsules there for each bone if you need that kind of detection. I would not suggest using it for moving around cause high chance of it getting stuck somewhere cause some object got in between 2 legs etc.

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@lyric flint pathfinding is made so its always shortest route, if you want units to consider some other elements you need to implement your own (someone correct me if Im wrong, Im also in part stuck at this 😄 ) Not sure I understand this part tho "However, when the player gives a unit a move command they do that and go off and do other things, trusting the pawn to figure it out (mostly).", character not moving correctly or taking good commands?

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@woven sleet can you check if any dynamic objects have enabled CanEverAffectNavigation? That could be causing the issues. Unless I really need to, I keep this option OFF for all nonstatic objects

paper sparrow Aug 21, 2020, 12:09 PM

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@woven sleet can you check if any dynamic objects have enabled CanEverAffectNavigation? That could be causing the issues. Unless I really need to, I keep this option OFF for all nonstatic objects
@ivory violet I've been searching for a similar answer.... I will go look as well! What do you mean by a 'dynamic object' though?

ivory violet Aug 21, 2020, 12:21 PM

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@paper sparrow for example, you place a bag on your character as a separate actor/object and if it has CanEverAffectNavigation enabled, its going to constantly rebuild navmesh while you are moving. Maybe I used wrong word here. I once had some floating stones that were animated to move and they accidentally had that option enabled thus messing with the navigation around their area.

paper sparrow Aug 21, 2020, 12:23 PM

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Cool. I'm using world composition but every time one of my levels loads it constantly rebuilds the navmesh. I thought it was an issue with the recast actor but the other levels under persistent dont do this, so I guess its some sort of actor in the level that might have this option on somewhere. I'll have a look

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When would you ever enable this option? E.g. doors thay open / close?

ivory violet Aug 21, 2020, 12:25 PM

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Yep. Or if some rubble falls down the road and blocks the path. But I didnt do this in gameplay yet so I only know it in theory, I only know issues it causes me when it was left unintentionally enabled 😄

midnight scroll Aug 21, 2020, 12:49 PM

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So. I just started to work on some AI. Very simple at the moment. But I'm having an odd hitch. Logically it all works perfectly fine for an undetermined amount of time and eventually this execution line just stays. It doesn't actually turn, the AI is frozen.

📎 unknown.png

real spire Aug 21, 2020, 12:52 PM

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@woven sleet Try ticking off "Update Navigation Automatically" in Editor Preferences

rough goblet Aug 21, 2020, 2:15 PM

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I have an issue with nav link proxies. If I disable one while an AI is on its way to it, it doesn't tell the AI to update its path. It just walks towards it and gets stuck.

rough goblet Aug 21, 2020, 2:35 PM

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When I disable the smart link the arrow stays green for a few seconds and while it's still green the AIs do update their paths but when it turns black AIs just run into it.

rough goblet Aug 21, 2020, 3:04 PM

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I just need to call move to again and they'll recaculate their path. Is the broadcast in the nav link proxy supposed to take care of that?

fallow hound Aug 21, 2020, 3:11 PM

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there is a broadcast for when the proxy is used, I'm not sure about activated/deactivated

minor compass Aug 21, 2020, 4:55 PM

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Probably a simple question, I'm trying to do a simple move to vector using blackboard, currently it only executes on the first move order and doesn't seem to update the keys continuously

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📎 unknown.png

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📎 unknown.png

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I'm grabbing a move order vector from the pawn, and it works fine if I just use move to in player pawn but I'm hoping to do something a little more extendable with the behavior tree.

ivory violet Aug 21, 2020, 6:13 PM

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@minor compass Does it work when the character reaches the end of first location and then resents with new one?
If I understood correctly, you want the character to change move to destination each time BTS selects new one?

minor compass Aug 21, 2020, 6:27 PM

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@ivory violet yes it should do a new location on each trigger. (when the move vector changes in the pawn).

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Right now it moves once, and then doesn't reset.

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📎 unknown.png

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That's where I'm triggering the behavior tree as when I put it on begin play in the controller itself the tree doesn't trigger

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📎 unknown.png

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Got it to issue a new move on completion, but being able to have it move to the new vector if that changes mid move is the intended behavior

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📎 unknown.png

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Observe blackboard value is on though

ivory violet Aug 21, 2020, 6:42 PM

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I didnt know how to do it with builtin MoveTo so I created custom one that checks on timer or tick if the destination currently in use equals one set in the BlackBoard, if not, I make it call movement inside the task again

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If live tracking vector is possible, someone correct me how to do it that way 😄

minor compass Aug 21, 2020, 6:58 PM

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It's tied to a formation system so kinda stuck with trying to live track a vector 😕

ivory violet Aug 21, 2020, 7:34 PM

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Implement your custom solution then 😄 That way you can also upgrade it with all sort of stuff you might need in the future

olive delta Aug 21, 2020, 7:43 PM

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can anyone nodge me to a sword ai behavior combat tutorial?

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if anyone knows a good ai behavior tutorial pls let me know

minor compass Aug 21, 2020, 7:46 PM

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📎 unknown.png

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Got it to work with a parallel

pine steeple Aug 21, 2020, 8:21 PM

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why?

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also why two services doing the same thing?

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@minor compass

minor compass Aug 21, 2020, 10:06 PM

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Same service, but it has to set the variables initially and then after the move

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Removing one of them breaks being able to issue orders

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Although if I remove the check I can remove that first service

coarse obsidian Aug 21, 2020, 10:59 PM

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ok so after about 2 hours of ticket a box, compiling playing... rinsing and repeating.... does anyone know common reason that "orient rotation to movement" does not rotate your character to the direction of movement?

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my brain is moosh

fallow hound Aug 21, 2020, 11:05 PM

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is that in controller?

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you might also need to have the pawn share rotation with controller

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controller is turning in movement direction, but not the pawn

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thats a checkbox in pawn somewhere

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or in char motion

ivory violet Aug 21, 2020, 11:16 PM

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@coarse obsidian toggle in function defaults Use Pawn Control rotation and Use Controller Desired Rotation. Toggling those 3 might give you desired result

coarse obsidian Aug 21, 2020, 11:53 PM

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thank you both, I will try these tomorrow, I'm done for the day 🙂

low oak Aug 22, 2020, 6:07 AM

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how to solve the gap btn collision and nav mesh, it make my AI stop when close to wall

📎 unknown.png

midnight scroll Aug 22, 2020, 8:08 AM

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Is RotateToFaceBBEntry bugged somehow? I have a detection component that updates the closest actor to the AI and sets it in the blackboard. But every so often the AI gets stuck on RotateToFaceBBEntry. Just stands there not rotating, but it's like it never finishes it's execute.

limber tiger Aug 22, 2020, 10:27 AM

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There is a buffer by design, sinper. If the navmesh went right up to the wall then the AI would be able to physically collide with it, which is intended to be avoided.

low oak Aug 22, 2020, 1:08 PM

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thanks

There is a buffer by design, sinper. If the navmesh went right up to the wall then the AI would be able to physically collide with it, which is intended to be avoided.
@limber tiger thanks

thorny jay Aug 22, 2020, 3:26 PM

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@low oak the buffer between navmesh edge and wall is usually the radius of the character. The reason is that if the player capsule is 100 units wide and the character's location is as the centre (as it always is for characters) then it cannot get any closer than 50 units or it would start clipping through the wall

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So you don't want navigation trying to take the character on routes that would result in it clipping into the wall

zenith kernel Aug 23, 2020, 9:01 AM

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Anyone know why AI perception can't detect actor (with stimulus source component) that attached to player character or other object?

quick portal Aug 23, 2020, 9:54 AM

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Hey guys. I have a slime npc which in one state just jumps around randomly. As I want it to stay in the navigable area, I want to get a random point on radius (only on the radius circle, not closer) and check if it's in the navigable radius, else find another direction. Any Idea how I could do this?

real spire Aug 23, 2020, 10:57 AM

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This maybe takes care of all that? https://youtu.be/rSuCvggfItE

YouTube

Mathew Wadstein

WTF Is? Get Random Reachable Point In Radius in Unreal Engine 4 ( U...

What is the Get Random Reachable Point In Radius Node in Unreal Engine 4

Source Files: https://github.com/MWadstein/UnrealEngineProjects/tree/WTF-Examples
Note: You will need to be logged into your Epic approved GitHub account to access these examples files. https://github.co...

▶ Play video

paper sparrow Aug 23, 2020, 11:30 AM

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Yep. Or if some rubble falls down the road and blocks the path. But I didnt do this in gameplay yet so I only know it in theory, I only know issues it causes me when it was left unintentionally enabled 😄
@ivory violet No luck 😦 Every time I open or save the level, it still 'rebuilds navigation'. I've checked every movable actor and made sure it doesn't 'can affect navigation'

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But I suppose it's a good optimisation anyway!

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Seen this 'dynamic obstacle' on my NPC actors though... Does that do anything?>

📎 unknown.png

cerulean plover Aug 23, 2020, 3:46 PM

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Hi I'm having a really weird and stressing issue, I have some characters walking around, I have navmesh, landscape and some houses around as well. When the character needs to go around the house (or objects in general) it tries to do it but fails and gets stuck in the object he is trying to avoid

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I tried on a new project and it seems to work but even the navmesh generates a different navmesh area around the house

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My project seems kinda broken but i cant transfer everything on the new project since its getting bigger

summer axle Aug 23, 2020, 3:47 PM

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Has anyone used this much? https://github.com/SkaveRat/DonAINavigation

GitHub

SkaveRat/DonAINavigation

This plugin provides a 3D dynamic pathfinding system for use with Unreal Engine 4. It's primarly designed for Flying AI creatures based in dynamic or procedural worlds that need to solve co...

dusk igloo Aug 23, 2020, 8:37 PM

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@summer axle I haven't but sounds kind of promising! That's my biggest let down in the game I'm building now. the AI isn't "GREAT" They seem kinda like too perfect.

cerulean plover Aug 23, 2020, 8:53 PM

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Oof if anyone would like to help me with my AI stuck in walls while pathing I'm always available, cant really find anything ç.ç

lyric flint Aug 23, 2020, 9:08 PM

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@cerulean plover set the agent radius settings, press P to view the active navmesh so the pathing is always working

📎 unknown.png

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there must always be green for any path you want available

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that's all i have on that. i hope that helps. thanks

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(example of the green pathing being available even on small stairways and platforms)

📎 unknown.png

woven bobcat Aug 23, 2020, 9:23 PM

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hey guys i wanna ask have anyone here have any clue to how to do autopathing?

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🤔

cerulean plover Aug 23, 2020, 9:27 PM

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@cerulean plover set the agent radius settings, press P to view the active navmesh so the pathing is always working
@lyric flint i definitly did that but the AI still its acting like that

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even if i set the radius very high the AI doesnt care

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and go against the wall ignoring the wall radius

lyric flint Aug 23, 2020, 9:28 PM

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check the collision settings of each static mesh then

cerulean plover Aug 23, 2020, 9:29 PM

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the collision is the basic one i saw, i tried to tweak it a little bit but its something to do with the navmesh itself

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i tried with differents models

lyric flint Aug 23, 2020, 9:29 PM

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📎 unknown.png

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it works on the default third person game project. pathing shoudl work just fine

cerulean plover Aug 23, 2020, 9:29 PM

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thats why im confused

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im trying to compare the projects

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i tried the top down one

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and it works just fine

lyric flint Aug 23, 2020, 9:30 PM

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send a pic of the navmesh please

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windows key -> shift -> s to take a snip of the unreal area in question from the application

cerulean plover Aug 23, 2020, 9:31 PM

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i compared every single digits and they are equals :\ im using it on the landscape not on plane if it does matter idk

lyric flint Aug 23, 2020, 9:31 PM

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right press P to enable the navmesh visibility and send an image.

cerulean plover Aug 23, 2020, 9:31 PM

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when i come back to my pc i will send you a pic :\

lyric flint Aug 23, 2020, 9:31 PM

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k

cerulean plover Aug 23, 2020, 9:31 PM

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📎 unknown.png

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thats the area

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basically what my character does is attaching itself to the wall

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and glitch

lyric flint Aug 23, 2020, 9:32 PM

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if it paths to the right side there are holes in there

cerulean plover Aug 23, 2020, 9:32 PM

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left

lyric flint Aug 23, 2020, 9:32 PM

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your character doesnt need to do pathing htough

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your character is input controlled

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you mean the AI?

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make sure the navmesh bounds volume Z lower bound is below the landscape.

cerulean plover Aug 23, 2020, 10:02 PM

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you mean the AI?
@lyric flint ye the ai is actually controlled by the player, the game is an rts and they eventually will do other things while im not selecting them

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so i made them ai

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btw nothing is doing the trick, i think im going further with the development and figure it out later

lyric flint Aug 23, 2020, 10:30 PM

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if you execute MoveTo on the correct location for moveto, it should work. make sure your RTS click selection point for the destination of the MoveTo is a correct vector point in 3d space, and make sure the navmesh is visible for all areas you wish to MoveTO. you might want to disable movement to areas that cannot be traversed, by disabling the clicker from clicking on those regions, similar to how starcraft / warcraft disable clicking movement commands outside of navigable bounds.

random jay Aug 24, 2020, 3:34 PM

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Anyone know any good resources for example AIs? Specifically melee combat AIs would be interesting but any good examples would be great

real spire Aug 24, 2020, 6:10 PM

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Ryan Laley has a solid tutorial series on AI, especially if you're starting from scratch. It's not focused on combat however - if you already know about Behavior Trees/Blackboards and basic stuff like getting AIs to chase players, patrol etc it won't be of much use.

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It's here if you want to take a look @random jay : https://www.youtube.com/playlist?list=PL4G2bSPE_8ukuajpXPlAE47Yez7EAyKMu

YouTube

AI

north willow Aug 25, 2020, 1:05 AM

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hey goys im pretty nooby at making AI but when I have one enemy everything works fine but when i have multiple it seems like they are taking the inputs from the same exact tree and some go to one of the enemies and some of the executes go to the other

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is there a simple way to fix this

north vapor Aug 25, 2020, 3:27 AM

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how do you alert other ai that all use the same controller and behavior tree

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if one ai sees the player alert others

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anyone know a way of doing this

patent hornet Aug 25, 2020, 3:43 AM

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AIManager with a delegate seems like the simplest way to go about it

north vapor Aug 25, 2020, 6:46 AM

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zlo how do i create a ai manager i dont see any tutorials on youtube?

patent hornet Aug 25, 2020, 7:22 AM

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you make an Actor, put it on the level, call it AIManager

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have the AI register with it and subscribe to its event dispatchers

untold nebula Aug 25, 2020, 10:02 AM

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How would you go about making a driving AI which recognizes traffic?

wary ivy Aug 25, 2020, 10:02 AM

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by thinking a lot and researching

compact comet Aug 25, 2020, 5:00 PM

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Hi, I'm trying to setup an AI for an horror game, and everything is going fine, but i can't find a way to change walking speed of the AI when it sees the player or not, can someone give a tutorial on how to create that? I've been looking for that for for hours and i only find how to setup sprint for my character and not for AI

patent hornet Aug 25, 2020, 6:58 PM

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same difference you just change its MaxWalkingSpeed in the CMC

north vapor Aug 25, 2020, 7:30 PM

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@patent hornet do you know any event dispatcher tutorials idk how to alert ai that have the same controller and tree

patent hornet Aug 25, 2020, 7:31 PM

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that should be googlable

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but no

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i don't know where basic tutorials live

north vapor Aug 25, 2020, 7:38 PM

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@patent hornet can you show me example when you have the time i cant seem to find anything related to what im trying to achieve with my ai

real spire Aug 25, 2020, 9:28 PM

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https://www.youtube.com/watch?v=sEcoWGrF1Hg

YouTube

Mathew Wadstein

HTF do I? Event Dispatchers in Unreal Engine 4

How do I use Event Dispatchers in Unreal Engine 4?

Source Files: https://github.com/MWadstein/wtf-hdi-files

▶ Play video

ionic geode Aug 26, 2020, 7:56 AM

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Hey,
Anyone knows if it possible to increase an agents max step height in a specific area of the nav mesh?
Imagine if I have a global step height of 50, but in certain areas I want it to be 100.
The ideal scenario would be if I could place a volume around an area and then build a new nav mesh.

wary ivy Aug 26, 2020, 11:05 AM

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maybe add a volume into the game world and then on overlap change the step height in the movement component (or whichever handles it)?

ionic geode Aug 26, 2020, 11:21 AM

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Thanks @wary ivy But I need the nav mesh to be updated at build - not change stuff at runtime.

wary ivy Aug 26, 2020, 11:21 AM

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ah right

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sorry, I misunderstood you 😄

floral mango Aug 26, 2020, 12:45 PM

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@ionic geode look at Nav Modifier Volume

hearty anvil Aug 26, 2020, 9:23 PM

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I have a problem, my AI is not registering to the weapon bullet. Because of this, no damage is done. But it reacts to PainCausingVolume!

left hull Aug 27, 2020, 5:23 AM

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Hi,
I am trying crowd ai controller, but...
AIs seem to be not avoid idle characters.
Is crowd AI not support idle character?

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I want to make AI keep a certain distance between others during not moving

south palm Aug 28, 2020, 1:26 PM

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guys why is my ai not working?

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im using behaviour tree

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and its not going to specific point in a bp actor

solar bronze Aug 28, 2020, 1:36 PM

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we cant help you if you dont give us more information

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whats in your behavior tree?

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are you running your behavior tree?

south palm Aug 28, 2020, 1:52 PM

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Yes

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Wait I used this tutorial

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https://youtu.be/bZPcWjyW9Ro

YouTube

Ryan Laley

Unreal Engine 4 Tutorial - AI - Part 5 Patrolling NPC Continued

In the last episode I showed you how to have an AI follow a patrol route. In this episode we will add to this and give the ability to our NPC to loop their patrol route, walk back on their selves, and pause along the path.

Support me on Patreon and get access to videos early,...

▶ Play video

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Sorry not this one

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The fourth one

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https://youtu.be/eLI6TOXaG5k

YouTube

Ryan Laley

Unreal Engine 4 Tutorial - AI - Part 4 Patrolling NPC

In this episode I show you how to make a NPC patrol a route; travelling from point to point.

Support me on Patreon and get access to videos early, join our developer community on Discord, get exclusive behind the scenes videos on my projects and much more over at https://www....

▶ Play video

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It didn't work ):