#gameplay-ai | Unreal Source | Page 111

lyric flint May 13, 2019, 6:01 PM

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@tough helm Perhaps another way to tackle this would be to use GetCurrentlyPerceivedActors(UAISenseConfig_Sight::StaticClass(), OutActors); From your AIPerceptionComponent

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And use a timer to check if the actor you are interested in is in the OutActors array

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if yes, accumulate the threat

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by timer, I mean it can be on Tick, Or on behavior tree, Or whatever

jaunty peak May 13, 2019, 9:44 PM

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Does sight stimuli have age? Or rather could that be used?

bold sapphire May 14, 2019, 5:38 AM

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What is the best way to move 100 ai's in view of camera at the same time without fps issues? I am using blackboard with character movement component.

wary ivy May 14, 2019, 6:51 AM

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character movement component is slow, it'll bog down the game thread

bold sapphire May 14, 2019, 7:10 AM

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I turned off the tick for my ai's just to see what would happen. it seems like there is no issue with 100 moving around. It is more the tick of 100 actors that cause the frame drop. I did notice that they still move around and attack each other with tick disabled so that is a good thing. Maybe I can disable the tick and turn it on if the ai is close to the character.

wary ivy May 14, 2019, 7:40 AM

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can't you also change the tickrate?

misty osprey May 14, 2019, 9:55 AM

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Hey guys, there is a tick in the character options that will rotate the AI smoothly whenever its rotating instead of teleporting to the new rotation. Does someone know where it is and how it is called?

pine steeple May 14, 2019, 11:38 AM

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@misty osprey there is a turn rate option

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in the CMC

misty osprey May 14, 2019, 1:42 PM

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hey man, nah thats not working. its not using interpolating to begin with. I try to turn this on.

quick lance May 14, 2019, 6:52 PM

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Anyone ever tried attaching a NavModiferComponent to a character?

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Such that the nav modifier could be moving around with the character?

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(need to have a distance in front of players be given higher path cost to try and avoid pathfinding right in front of them)

patent hornet May 14, 2019, 8:31 PM

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that won't work, pathfinding calculations don't update every frame

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look into crowd avoidance

gaunt forge May 14, 2019, 8:35 PM

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AI detection question

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this works

📎 Capture.PNG

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But

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this doesn't (different level, same blueprints)

📎 Capture.PNG

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The onSeePawn never fires on the second one there

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I verified it's set to the same autopossess AI, controller (I even tried re-pasting from the working level)

lyric flint May 14, 2019, 8:39 PM

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AI Perception has a RequestStimuliListenerUpdate, maybe try that?@gaunt forge

gaunt forge May 14, 2019, 8:39 PM

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Oh, I will check that

lyric flint May 14, 2019, 8:40 PM

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all perceived can be get with GetCurrentlyPerceivedActors

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

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see if your target is already in the OutActors in the second level @gaunt forge

gaunt forge May 14, 2019, 8:45 PM

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Nope, no actors

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Let me compare to the other level

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right, the first level it sees the actor

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tried re-doing both actors from the working level, nada

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let me try an empty level out of curiosity, maybe something else is wrong

lyric flint May 14, 2019, 8:50 PM

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In my project I'm using OnTargetPerceptionUpdated instead of onSeePawn

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So the question is, are you using AI perception component?

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It's possible that pawn sensing Is deprecated maybe?

gaunt forge May 14, 2019, 8:52 PM

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works fine on an empty level

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is it deprecated? I need to go check 4.22

lyric flint May 14, 2019, 8:53 PM

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@gaunt forge https://answers.unrealengine.com/questions/437818/pawn-sensing-vs-ai-perception.html

gaunt forge May 14, 2019, 8:53 PM

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Yeah, was just reading that

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so no, looks like it's not going away, as the docs don't show it

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neither method sees the actor in the second level though

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so there's something else wrong.

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it's not line of sight, I confirmed that one

lyric flint May 14, 2019, 8:55 PM

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Can you try as a test to use exclusively OnTargetPerceptionUpdated

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try it in the first level, in and out of sight, just to confirm it works

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This method can be used with an if/else

gaunt forge May 14, 2019, 8:56 PM

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http://api.unrealengine.com/INT/BlueprintAPI/EventDispatchers/OnTargetPerceptionUpdated/index.html

On Target Perception Updated

lyric flint May 14, 2019, 8:57 PM

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Stimulus.IsActive() Means it sees the target, and else it's out of sight

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void AYourAIController::OnTargetPerceptionUpdated(AActor * Actor, FAIStimulus Stimulus)

gaunt forge May 14, 2019, 8:57 PM

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Ok, works on the empty test

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Let me try now

lyric flint May 14, 2019, 8:58 PM

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if (Stimulus.IsActive()) { //I see it } else { //it's gone }

gaunt forge May 14, 2019, 8:58 PM

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nope, doesn't see the player in either other level, though

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just in the empty "test"

lyric flint May 14, 2019, 8:59 PM

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hmm, something is fishy 😃

gaunt forge May 14, 2019, 8:59 PM

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I have a stimuli source on the player

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(sight) and the same on the ai now (also sight)

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confirmed sight lines up

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well, the total lack of docs on the "new" version lead me to think it's not ready yet

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but that doesn't help me either way 😄

lyric flint May 14, 2019, 9:00 PM

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can you try a breakpoint on OnTargetPerceptionUpdated?

gaunt forge May 14, 2019, 9:02 PM

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I have one on it

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that's how I know its not firing at all

lyric flint May 14, 2019, 9:03 PM

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@gaunt forge In your AI controller class, in the constructor, did you add the dynamic binding for OnTargetPerceptionUpdated?

gaunt forge May 14, 2019, 9:03 PM

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I suspect there's something else I need to configure, but the docs are a bit shy

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of course not, because I wasn't using it 😄

lyric flint May 14, 2019, 9:04 PM

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I've been using AI perception for a while now, no major problems, honestly I don't remember anything from my pawn sensing days

gaunt forge May 14, 2019, 9:05 PM

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it's the default, so it uses:

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void AAIController::PostRegisterAllComponents()
{
Super::PostRegisterAllComponents();

// cache PerceptionComponent if not already set
// note that it's possible for an AI to not have a perception component at all
if (PerceptionComponent == NULL || PerceptionComponent->IsPendingKill() == true)
{
    PerceptionComponent = FindComponentByClass<UAIPerceptionComponent>();
}

}

lyric flint May 14, 2019, 9:05 PM

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I apologize for not being able to be of much help specific to pawn sensing

gaunt forge May 14, 2019, 9:06 PM

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let's see, let me check the header

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/** Component responsible for behaviors. /
UPROPERTY(BlueprintReadWrite, Category = AI)
UBrainComponent BrainComponent;

UPROPERTY(VisibleDefaultsOnly, Category = AI)
UAIPerceptionComponent* PerceptionComponent;

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that's all there is for perception

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Pretty sure that isn't ready for prime time

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I assume you're using your own ai controller

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which would make sense, this is just for a simple follower

lyric flint May 14, 2019, 9:10 PM

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Yes, UPROPERTY() UAIPerceptionComponent* AIPerceptionComp it's in my .h

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and UFUNCTION() void OnTargetPerceptionUpdated(AActor* Actor, FAIStimulus Stimulus);

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And that's pretty much all

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then, in cpp
AIPerceptionComp->OnTargetPerceptionUpdated.AddDynamic(this, &AMyAIController::OnTargetPerceptionUpdated);

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Which has the Stimulus.IsActive() If/else

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ah, and the AIPerceptionComp has
`AIPerceptionComp = CreateDefaultSubobject<UAIPerceptionComponent>(TEXT("AIPerceptionComp"));

UAISenseConfig_Sight* sight = NewObject<UAISenseConfig_Sight>();
AIPerceptionComp->ConfigureSense(*sight);

`

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That's it, to quote It just works

gaunt forge May 14, 2019, 9:15 PM

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let me try registering

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nope, not even if I register the player as a sight source

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sight stimuli source, I should say

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However, if I register my player, that fixes the other issue with the follower, so that'll do 😃

lyric flint May 14, 2019, 9:23 PM

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👌

flint trail May 14, 2019, 9:30 PM

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has anyone tried this AI from Marketplace https://www.unrealengine.com/marketplace/en-US/slug/visai-an-advanced-modular-ai-system ?

VisAI - An Advanced Modular AI System by Visualistic Studios in Bl...

This system is dedicated to making AI in Unreal easier, more efficient, and modular. This will save you time in creating any AI system, and decrease repeat code!

near jetty May 15, 2019, 4:14 PM

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Number of Blueprints: 53

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@flint trail its shit

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a plugin like that being BP only essentially means its shit

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and very likely unusably level of slow

flint trail May 15, 2019, 4:28 PM

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hehe, I see

near jetty May 15, 2019, 4:37 PM

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@flint trail as a rule of thumb, any "system" or complex code framework that is all blueprints is shit

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all of them

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no exceptions that i know of

polar hamlet May 15, 2019, 5:09 PM

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Pawn Sensing component says in its description "does nothing on network clients" but my networked clients using dedicated server option enabled can detect each other using PawnSensing.... https://gyazo.com/92db665af9fc9b6cfbe31765a9c07f2b

Gyazo

▶ Play video

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https://gyazo.com/f6004d6b14a27dc5a38b12d07bd44eb8 https://gyazo.com/1878bf05a33bd020f4c17a17571c2c6e https://gyazo.com/756d9af9797c3afb54db8075ca142dc6

Gyazo

jaunty peak May 15, 2019, 5:27 PM

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Pawn Sensing is depreciated. AI Perception is the current one.

polar hamlet May 15, 2019, 5:33 PM

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ahh... ill update my code then thanks !!

pine steeple May 15, 2019, 7:10 PM

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also Percepetion runs on the server

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and the server can see all clients

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so the ai can see all clients

polar hamlet May 15, 2019, 8:32 PM

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Ye I did not even pay attention to the print saying SERVER... I guess I misunderstood, So the clients did not detect anything and it was the actor on the server that did ?

west jewel May 15, 2019, 8:55 PM

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Any one familiar with what exactly that value of MoveInput is in a call to RequestPathMove? I was trying to interpret it as a controller input but it seems that's... wrong.

wraith eagle May 16, 2019, 10:08 AM

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Just want to double check in case I've missed it... Is there functionality in the engine for storing off NavMesh data, and then reapplying it to the NavMesh? Like, if you know you have two different NavMesh states, then you can store them, and swap between them rather than rebuilding the nav mesh dynamically?

hoary peak May 16, 2019, 6:04 PM

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Pretty sure I haven't changed anything in my project but my AI just returns "blocked" on AI Move To, I do have a navmesh and I've checked with Show Navigation

hoary peak May 16, 2019, 6:57 PM

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@near jetty Would you mind trying to help me?

bold sapphire May 16, 2019, 7:03 PM

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did you press p to show the nav mesh ?

hoary peak May 16, 2019, 7:16 PM

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I create my world during runtime but I have used the console command "Show Navigation" and it's there

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If there's no navmesh it returns aborted as well

wraith eagle May 16, 2019, 7:26 PM

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Can you step back through the code and see why it's hitting Abort?

hoary peak May 16, 2019, 7:29 PM

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Me? It's returning blocked not abort

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And there's clearly nothing blocking it(plain terrain)

wraith eagle May 16, 2019, 7:37 PM

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Then step through and see what it thinks is blocking you?

hoary peak May 16, 2019, 7:38 PM

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📎 unknown.png

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Litteraly nothing is blocking it

wraith eagle May 16, 2019, 7:52 PM

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But for the code to return Blocked, the Navigation System must think that something is

hoary peak May 16, 2019, 7:53 PM

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Yeah that's the entire problem

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I don't think I've changed anything but either the navmesh or the AI isn't working correctly

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I have no idea what the problem could be

wraith eagle May 16, 2019, 7:55 PM

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Are you doing it all in Blueprints? Or C++?

hoary peak May 16, 2019, 7:55 PM

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Blueprints

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There has be a setting which i've fucked up because I just noticed this today

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I am not sure when it last worked but it has been working before

wraith eagle May 16, 2019, 8:02 PM

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Guessing no source control to go back and see?

hoary peak May 16, 2019, 8:08 PM

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I have a project backup from 4th of May, i'll check

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It works as it should in the version from 4th of May

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Since I haven't touched the navmesh since that version what could cause this error?

hoary peak May 16, 2019, 8:46 PM

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Project settings, navmesh settings and world settings are exactly the same

wraith eagle May 16, 2019, 8:59 PM

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Well, the path following doesn't just return blocked for no reason. Will need some debugging to figure out what the Path Following Component thinks is blocking the agent

hoary peak May 16, 2019, 9:00 PM

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Damn, that shit could take days

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Especially since it isn't an actor blocking the way, the problem is for the entire map

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Wow it was such a dumb problem actually

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I had moved code from the game state to another class and a self reference followed the spawning of the npc so that gamestate ref was 0 and thus it had 0 movementspeed resulting in it returning blocked

wraith eagle May 16, 2019, 9:42 PM

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lol. Amazing. At least it wasn't something really awkward

bold sapphire May 17, 2019, 12:51 AM

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is this due to the character movement component?

📎 profile1.png

pine steeple May 17, 2019, 3:26 PM

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yes

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CMC is heavy

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how many ai you have?

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1ms is spent on find floor

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which is a lot

bold sapphire May 17, 2019, 3:51 PM

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@pine steeple yea it is 100 ai's and I don't have room to disable their ai so I guess I will just have to do less than 100.

pine steeple May 17, 2019, 3:52 PM

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its not the ai

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its the cmc

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different things

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try enabling navwalking for ai

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and adjust some settings in the cmc

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we got it down to around 4ms for 150ai

bold sapphire May 17, 2019, 3:53 PM

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I did that and it made it to where I could not attack them the line traces stopped working.

pine steeple May 17, 2019, 3:53 PM

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and that is on a complex map

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line traces for what?

bold sapphire May 17, 2019, 3:53 PM

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for my attacks

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the over laps stopped working and it took me a whole day just to figure it out that I changed it to nav mesh walking

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ok Ill take a look at the cmc settings thank you =). My aim is 100 ai's hope I can do it.

fallow hound May 17, 2019, 4:00 PM

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what is navwalking btw? I assume it disables some collision stuff and just hard wires the NPC to the navmesh

pine steeple May 17, 2019, 4:47 PM

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it uses navmesh projection

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to find the floor

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and stuff

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and cheaper than traces

bold sapphire May 17, 2019, 4:49 PM

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looking better

📎 profile2.png

pine steeple May 17, 2019, 5:06 PM

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we are going to make a lighter weight version of CMC

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for ai pawns

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its too heavy

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but thats a big job

bold sapphire May 17, 2019, 5:36 PM

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Everything is running much better. I am going to test on android then run another profile to see other areas I can improve.

keen spade May 17, 2019, 5:42 PM

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Hi, I am looking to setup a basic health and stat system. Health, Mana, Exp gained, Damage resistances, drops ect. Essentially I then want to create instances for mobs that use this system and I can just go into the instance and set the variables, a master Mob blueprint for the majority of my ai.

The standard blueprint character class with 'character movement (inherited)' already has stuff like max velocity. I am trying to think long term.

If I want to create a stable system what the best way to go about creating the backbone of the system is. If its best to create the parent as a C++ system or use the character class blueprint, setup a system using blueprints and widgets/structures/arrays . For an RPG style game.

bold sapphire May 17, 2019, 6:23 PM

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C++ is the way to go for performance. I found blueprint to be easier for me but I lose the C++ benefit. As for the master mob blueprint that is good anything you want all your mobs to have like hp damg. On the child blueprints you make from that you can set drop list for items and stuff related to that mob.

keen spade May 17, 2019, 6:29 PM

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Thanks, If I prototyped in Blueprint, how hard would it be later to swap to out the master with a C++ version?

pine steeple May 17, 2019, 6:33 PM

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try to make structs and enums in c++

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will save a lot of headache later down the road

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i dislike bp structs/enums

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but sure prototype in bp, but try to put things in c++ as it will save a lot of hassle

loud tundra May 17, 2019, 7:10 PM

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Hello all. If I wanted to create an AI that could run around and fight other AI characters, could I adapt the behaviours the AI uses when it detects the player? Are there any free training methods to create something comparable to the bots in UT2004?

pine steeple May 17, 2019, 7:51 PM

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you could check out the UT4 source project

silk fulcrum May 17, 2019, 8:55 PM

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Hi everyone, I am trying to get Simple Move to Location to work but I am getting an error that NavSys is none; in blueprint where do I go about making sure there is a nav system?

loud tundra May 17, 2019, 10:09 PM

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@silk fulcrum Check your navmesh, if you're testing in a default map it might not have one

white crown May 17, 2019, 10:10 PM

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Then build paths

loud tundra May 17, 2019, 10:11 PM

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Is there a way to rebuild a navmesh without editing its properties?

white crown May 17, 2019, 10:13 PM

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Under the build tab?

silk fulcrum May 17, 2019, 10:14 PM

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Had a nav mwah, problem was I was running in dedicated server

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Not super sure why that means there’s no nav system

quick aurora May 17, 2019, 11:58 PM

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Any good resources that can get me acquainted with the aspects of UE4 AI? I need to make a zombie for my first project :p

lyric flint May 18, 2019, 12:01 AM

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@quick aurora https://www.tomlooman.com/survival-sample-game-for-ue4/

Tom Looman

Unreal Engine 4 C++ Survival Game Tutorial Series

C++ Survival game covering common gameplay concepts packed in an open-source project. Series includes C++, AI and Networking.

patent hornet May 18, 2019, 12:02 AM

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@quick aurora always good to check pinned messages on the channels for resources

quick aurora May 18, 2019, 12:07 AM

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Ah, thank you! I hadn't even thought of the pinned messages!

vernal thunder May 18, 2019, 3:28 PM

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Hey, guys, I have a small query: I'm using version 4.22. I have 4 instanced ai bots and controllers. However, there's only one instance of the task ChooseAbility. Does anyone know why 4 controllers are sharing one task instance?

📎 Untitled.png

pine steeple May 18, 2019, 3:29 PM

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is it a C++ task?

vernal thunder May 18, 2019, 3:29 PM

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No, It's a regular BP one.

pine steeple May 18, 2019, 3:30 PM

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no clue then cause BP tasks should be per instance

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and not shared

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c++ tasks can be shared

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unless they are sharing the same brain

vernal thunder May 18, 2019, 3:32 PM

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Alright. I'll give that a check. Thanks

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Nope. Didn't do the trick. Still the same

scenic fox May 18, 2019, 11:37 PM

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Hey guys! don't know if this is the right place to ask but

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Anybody knows what's the difference between PawnActions and GameplayTasks?
I reckon that gameplayTask are the updated version right?

I'm basically working on AI and wanted to call Actions on my pawn and have a weight to each of them... etc and i came along to PawnActions, but it seems they aren't used anymore
Thanks!

pine steeple May 19, 2019, 12:02 AM

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pawn actions was supposed to be the new stuff

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but it was never finished

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then gameplaytasks became the new one

scenic fox May 19, 2019, 12:08 AM

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gotcha

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i assume they just left it there for old projects who are using them

hybrid cipher May 19, 2019, 2:30 AM

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What's gameplay task?

pine steeple May 19, 2019, 12:45 PM

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gameplay task is an async task

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it can be used for many things

foggy sluice May 19, 2019, 2:31 PM

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Hello maybe someone knows when I set the variable in the blackboard why I cannot get the reference, like on the print string?

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📎 111111.png

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pretty easy but i cannot understand why it's null)

pine steeple May 19, 2019, 3:47 PM

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have you assigned the key

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in the behaviour tree?

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it needs to be assigned

foggy sluice May 19, 2019, 7:55 PM

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@pine steeple Yea you right!
i add keys in the Behavior tree and i see now. Thanks!

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coz I'm new in the AI 😃

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📎 unknown.png

night hazel May 19, 2019, 9:26 PM

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@buoyant geyser regarding your cover system... is there a reason you didn't make it a plugin?

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I'm thinking about using it for my game, and I'm curious about that regarding integration

buoyant geyser May 19, 2019, 9:27 PM

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only reason is I have no affinity to learning plugin development :)

night hazel May 19, 2019, 9:27 PM

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right on

buoyant geyser May 19, 2019, 9:27 PM

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btw it's all up on github, I've put it up there right before ECGC

night hazel May 19, 2019, 9:27 PM

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this is a cool project btw

buoyant geyser May 19, 2019, 9:27 PM

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thanks!

night hazel May 19, 2019, 9:28 PM

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it's like, almost exactly what I look for when evaluating stuff to integrate... well documented, well written, considers a lot of "you can do this..." kind of things

buoyant geyser May 19, 2019, 9:28 PM

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sweet

slow bobcat May 20, 2019, 1:44 PM

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Hi!
I have a question about the Perception Component and the damage.
Can you manually report a damage in c++? Using UAISense_Damage::ReportDamageEvent?

pine steeple May 20, 2019, 6:46 PM

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yes

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there is a static for it

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that is the static

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ive used it before

austere kindle May 20, 2019, 11:19 PM

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so I'm making a 2d, top-down ARPG, but the "top-down" part is kind of faked because the camera is setup like a sidescroller, would this be reason for nav meshes to just not work at all?

pine steeple May 20, 2019, 11:40 PM

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no?

austere kindle May 21, 2019, 12:01 AM

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hmm

austere kindle May 21, 2019, 12:18 AM

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I'm having an issue where my nav mesh seems to intermittently decide to work

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https://youtu.be/OAPLVXoD80w

YouTube

ZServ

Nav Mesh example

▶ Play video

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📎 unknown.png

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the nav mesh is bigger than the map, and they're all the same object, configured in the same way

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however the 3 on the left work, the 1 on the right does not

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but if I move the 1 on the right that didnt move above, to the left, in the editor, and then back?

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https://www.youtube.com/watch?v=XjiGluhMTi0

YouTube

ZServ

NavMesh2

▶ Play video

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then it works

torpid trout May 21, 2019, 9:30 AM

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hey guys. How is there a console command to visually see each pawn's pawn sensing in the level?

patent hornet May 21, 2019, 9:34 AM

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apostrophe, and its a keyboard shortcut

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don't know about sensing, its obsolete, but it does work for perception

torpid trout May 21, 2019, 9:41 AM

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I shouldn't use pawn sensing?

pine steeple May 21, 2019, 10:42 AM

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perception system you should be using

slow bobcat May 21, 2019, 10:57 AM

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Yep, Perception is the way. To debug press 5 and then use the NumPad to enable/disable options

ocean wren May 21, 2019, 1:18 PM

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hey all

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For whoever was asking about gameplaytags etc.. https://www.unrealengine.com/en-US/events/unreal-fest-europe-2019/using-the-gameplay-ability-system

Unreal Engine

Using the Gameplay Ability System

In this Unreal Fest Europe 2019 presentation, Matt Edmonds of Splash Damage Games takes a qualitative look at the Gameplay Abilities System (GAS) to help decide if it’s right for your team or project. Then, he switches gears to deliver some quantitative examples to help dri...

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Explains what it is at least..

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PawnActions are really old and unloved.. GameplayAbilities are used in Fortnite. So you know which one gets some support at least if bugs are found

warm salmon May 21, 2019, 6:36 PM

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can anyone recommend some recourses for learning to program AI in c++ ? cheers bois

maiden plume May 21, 2019, 7:03 PM

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Hey guys. I've been following a Tutorial and I've done everything right but, my AI will not go forwards. Could anyone lend a hand?

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Here's the code and the behaviour tree

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📎 unknown.png

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📎 unknown.png

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📎 unknown.png

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and it was from this tutorial https://www.youtube.com/watch?v=fTx-LYkrREU&list=PLbRBWFaQHaW__LcCtV-KnqqgIFOyyFhr5&index=3

YouTube

Asher Einhorn

Creating AI in UE4 Part 3 - Patrol

In this tutorial we will modify our AI to add a patrol behaviour, and look into how creating parameterised nodes can help us create building blocks that we c...

▶ Play video

foggy sluice May 21, 2019, 7:09 PM

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@maiden plume I think you need to add radius value in the "Get random point"

maiden plume May 21, 2019, 7:11 PM

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Tried that does nothing

foggy sluice May 21, 2019, 7:19 PM

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please try to play and watch the BTree and how its works in the left side.

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or mb it's with Vision check, set enum trouble..

maiden plume May 21, 2019, 7:21 PM

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Oh no its ok I got it working now you were correct

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You gotta change the value in that Radius to 360 to get it to move

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😛

foggy sluice May 21, 2019, 7:25 PM

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oh great 😃

fervent horizon May 21, 2019, 7:45 PM

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📎 Screenshot_216.png

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📎 Screenshot_217.png

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what is the problem? my character is stuck in this animation when idle

pine steeple May 21, 2019, 11:32 PM

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@fervent horizon did you not ask this in another channel?

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and how is this related to AI?

mystic dock May 21, 2019, 11:52 PM

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stands for animation implementation

pine steeple May 22, 2019, 12:18 AM

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:/

fervent horizon May 22, 2019, 1:42 AM

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someone told me to post here

worldly shard May 22, 2019, 11:10 AM

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navmeshes generate on up facing surfaces, so it would affect you

buoyant geyser May 22, 2019, 9:45 PM

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in case anyone's interested in steering behaviors and how to implement them and haven't come across this: https://gamedevelopment.tutsplus.com/series/understanding-steering-behaviors--gamedev-12732

Game Development Envato Tuts+

Understanding Steering Behaviors - Envato Tuts+ Game Development T...

misty holly May 22, 2019, 10:54 PM

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is there an easy way to have an ai follow a spline?

nimble atlas May 23, 2019, 6:54 AM

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hi all ive been thinking about implementing some sort of flocking/formation movement in my behaviour tree, does anyone have any examples or guidelines as to how to do this?

fallow stone May 23, 2019, 9:35 AM

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good tutorials to set up ai movement and animations with behavior trree?

wary ivy May 23, 2019, 10:20 AM

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@misty holly there's a marketplace asset you can buy

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@nimble atlas for formations you want to calculate the desired position for each member of the formation and have them follow that point

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the hard part is figuring out what to do when the route to the desired position is blocked

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@fallow stone you do animations with anim blueprints, not behaviour trees

fallow stone May 23, 2019, 10:32 AM

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i know that

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i meant set up the ai with behavior trees

wary ivy May 23, 2019, 10:40 AM

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what sort of AI?

fallow stone May 23, 2019, 11:02 AM

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nevermind i got it

fallow hound May 23, 2019, 3:33 PM

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lets say I wanted a class to control multiple characters at once, would each char pawn need their own controller?

wraith eagle May 23, 2019, 4:21 PM

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@misty holly How easy is 'easy'? Writing some spline following logic for a character isn't too difficult

nimble atlas May 23, 2019, 4:53 PM

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@wary ivy so in a sense i would need to hardcode the desired shape i want the agent to move in?

wary ivy May 23, 2019, 5:00 PM

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well, yes sort of

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a formation usually has a leader, right?

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and formation has N members

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so you need a way to calculate the position of the Nth member relative to the leader

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sooo if you had a line with 5 meter spacing you could calculate the relative position like this (pseudo code)

fn(int memberNumber) //assuming leader is 0
    spacing = FVector (0, -500, 0)
    relativePos = memberNumber * spacing
     //todo transform into world space

nimble atlas May 24, 2019, 12:34 AM

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ah ok that makes sense

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btw ive also been reading on on flocking, which is based off steering behaviours and things like alignment - cohesion - separation

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does flocking and formation movement have anything in common in that sense?

quiet zephyr May 24, 2019, 1:20 AM

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What would be a good approach for creating an Object, like a sphere, that would pull other objects towards it if they got close?
Like a Gravitational effect...
To be more Specific, If I have an AI that is moving close to the Object of Gravity to have it's destination recalculated to be effect by the Gravity pulling on it, changing it's course and destination point

floral mango May 24, 2019, 6:06 AM

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@nimble atlas well kinda...the rules you use for flocking (boids) are pretty general, they're just steering behaviours specific to groups

hoary peak May 24, 2019, 6:01 PM

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If I have a blackboard with it's own BT where I set a key shouldn't an inherited blackboard's value of that key also change even if it has a different BT?

quiet dove May 24, 2019, 9:23 PM

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As someone who hasn't really dug deep into the BT in Unreal, has anyone noticed any specific drawbacks to the BT model Unreal gives?

jaunty peak May 24, 2019, 9:42 PM

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@hoary peak a BB doesn't transfer values between BTs as far as I'm aware. I believe they are treated as separate.

hoary peak May 24, 2019, 9:45 PM

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@jaunty peak I thought that was what instance synced was for but it seems not, I moved the variable into the class using the BT instead

jaunty peak May 24, 2019, 9:48 PM

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I think you can have multiple BTs using the same BB but from the same AIC.

slow bobcat May 25, 2019, 7:22 AM

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Question about the main character and FSM/HSM: I always create by hand and c++ a FSM for the main character (the player) to control its states (running, crouching, walking, falling....). Doesn't matter the game or the engine, it's my way to go. But I want to ask you, how do you handle this? Does anyone here use a BT for the player (tasks only change states and state changes are controlled by the input + some other conditions)? Do you know if there's any plugin that gives you something like the Animation State Machine?

patent hornet May 25, 2019, 10:35 AM

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its part of the engine? UAnimInstance

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BTs are handy, they give you ability to do some fast prototyping, give a visual debugger, and you can always write the Tasks/Services/Decorators in c++

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but i wouldn't use a BT just to change states, no

sharp thunder May 25, 2019, 3:05 PM

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Hi, this question has been asked before by @latent crane but I couldn't find a satisfactory answer to it: Is it possible to pass parameters/BB keys to a 'Run Behavior' task?

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Eg. in my use case, I have a BT defined for an NPC to pick up an object X and bring it to location Y. I want to use this in another task where the NPC first calculates X and Y and then executes this pick-and-put task. It's supposed to do it twice (take X to Y1, then wait, then take X to Y2), which is why i was creating a separate BT for the pick-and-put task

hoary peak May 25, 2019, 3:09 PM

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From my personal experience i just have the NPC itself hold the values if they need to transfer from one BT to another because I can't find a way to get values to transfer from one blackboard to another even if it's inherited

sharp thunder May 25, 2019, 3:09 PM

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right. is this a deliberate feature or just a limitation?

hoary peak May 25, 2019, 3:10 PM

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No idea tbh, I can see why inherited blackboard wouldn't change values just because their parent did but at the same time I would like an option that syncs it to the parent value

sharp thunder May 25, 2019, 3:11 PM

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Kind of like local blackboards for each behavior, is that possible?

hoary peak May 25, 2019, 3:11 PM

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Tried to make it work for a couple hours yesterday but I just got more confused as to what instanced synced actually means

sharp thunder May 25, 2019, 3:11 PM

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ok cool thanks!

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sounds like a very obvious thing but i couldn't find this kind of discussion on any forum...

hoary peak May 25, 2019, 3:13 PM

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In your case I would add a variable "pickupObject" and "TargetLocation" to your NPC

sharp thunder May 25, 2019, 3:14 PM

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The problem with that is that if I have to use pick-and-put on another 2nd BT, i'll have to uses the same BB for that

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when that shouldn't matter

hoary peak May 25, 2019, 3:14 PM

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What do you mean?

sharp thunder May 25, 2019, 3:14 PM

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so pick-and-put is kind of 'bound' to whatever parent tree uses it

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eg. BT2 has a different kind of blackboard structure; in that case I cant directly use my pick-and-put BT because it uses keys from BT1's bb

hoary peak May 25, 2019, 3:16 PM

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I don't think I fully understand but you can use Blackboard inheritance

sharp thunder May 25, 2019, 3:17 PM

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i'm doing a poor job, hold on..

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If you consider the above subtree, it can only be used when the parents share a blackboard/have some kind of blackboard inheritance. I would like it to be more general: just pass in the two params X and Y, doesn't matter the shape of the blackboard.

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This is because I actually want to use pick-and-put in like 10 different BTs which have completely different blackboards

hoary peak May 25, 2019, 3:22 PM

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Okay so without being annoying, why not have the NPC store those params and then you can simply fire it from wherever? And since the NPC has the variables they don't need to be passed

sharp thunder May 25, 2019, 3:24 PM

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so use the npc as the BB?

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hmm

hoary peak May 25, 2019, 3:24 PM

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Yeah I have variables in my NPC class that's only used in BT's

sharp thunder May 25, 2019, 3:25 PM

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see in my mind i was kind of imagining an MVC architecture like in ReactJS, where you can pass down props and maintain local state etc. but this might work in my case, i'll have to think

hoary peak May 25, 2019, 3:25 PM

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Because I couldn't get BB inheritance to work the way I needed it to I stored it in the class instead

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Because I have bools that I set in one BT that needs to be checked in another BT

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And the value would be set per BB even though it was an inherited key so I was out of luck I guess

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To make it a bit cleaner you could even create a struct called something with BB I guess

slow bobcat May 25, 2019, 5:04 PM

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@patent hornet hi! But the AIAnimInstance is exclusively to control the animation states. Do you "mix" both, player state and animation state?

jaunty peak May 25, 2019, 9:46 PM

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@hoary peak you could do that in a function, just call it when you want the values passed over.

night robin May 26, 2019, 12:23 PM

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Hello everyone,
I am having a very very annoying issue with pathfinding and my navigation setup. My game has objects that can be placed, and I have a Human AI that often requires to move to these objects.

So, because I have had problems with regular collisions of objects I had to use NavArea_Null area class which should mean that the AI should never be able to get a valid path if the TargetLocation is obstructed by one of the objects, but no, all pathfinding queries and functions return a true or a partial path when the TargetLocation is inside a NavArea_Null.

My question is, is there any possible way to either make sure no valid path exists if the TargetLocation is inside a NavArea_Null?

hoary peak May 26, 2019, 2:14 PM

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I actually don't know but isn't that what obstacle is for?

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And then there's a node for if the TargetLocation is a valid AI Location

night robin May 26, 2019, 2:16 PM

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It is yes, that is how I define my objects with the NavArea_Null.
Hmm, I'll check

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I'm gonna see if instead of using pathfinding, I'll just get the navarea of the TargetLocation and handle it on my own. As I never want partial paths

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The thing is, when using NavArea_Null instead of the object's collision, it is like is automatically accepts partial parts which isn't the case when only the object's collision affects navigation

hoary peak May 26, 2019, 2:24 PM

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Just so I understand your problem you are generating random locations that the NPC walks too and sometimes the final destination isn't a valid location?

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@night robin

night robin May 26, 2019, 2:25 PM

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I have objects that can be placed in the world. Imagine blocks.

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I have a code for AI to find a reachable spot for one of these blocks

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So the AI can interact with them

hoary peak May 26, 2019, 2:26 PM

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Okay I am with you so far

night robin May 26, 2019, 2:27 PM

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Now, because the world is dynamic, there is a possibility that 2 object for example are adjacent to each other

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So, the code that finds reachable spots for a block, could test a point that is inside another object.

hoary peak May 26, 2019, 2:27 PM

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Okay so does thee Objects have a collision box and the AI has to walk inside it to interact?

night robin May 26, 2019, 2:28 PM

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No, they don't walk inside, just to one of their sides/faces (the code tests walk points at each side)

hoary peak May 26, 2019, 2:30 PM

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Wait

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So the problem is that the objects don't affect the navigation of the AI?

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Your problem is purely visual?(It doesn't look good that the AI clips the objects)

night robin May 26, 2019, 2:32 PM

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So, the pathfinding functions return that a path exists when the TargetLocation is inside one of these objects. Even if it isn't accessible.

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This is when using NavArea_Null

hoary peak May 26, 2019, 2:32 PM

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I would try using NavArea_Obstacle

night robin May 26, 2019, 2:32 PM

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Same thing

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There is a reason why I'm using navarea

hoary peak May 26, 2019, 2:33 PM

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Try using that node as well, it should return false if the location isn't accessable

📎 unknown.png

night robin May 26, 2019, 2:33 PM

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Alright, I will try using it

hoary peak May 26, 2019, 2:34 PM

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I haven't used it because I haven't run into that problem yet but it should work

night robin May 26, 2019, 2:35 PM

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I'll have a go and get back to you.
But if you want to know why I'm using navareas, it's is because if I just use the object's collision I get navmeshes generated on top of them and that screws with pathfinding even more when the AI is close to the main nav area and the ones on top (which aren't accessible, as they are separated from the main one)

hoary peak May 26, 2019, 2:36 PM

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There's an option for "can step up on" or something on static meshes and boxes but don't know if that would help you

night robin May 26, 2019, 2:37 PM

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It did not unfortunately

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But I'll try with the function you suggested in a bit, as well as my other custom solution and will see if I can solve this.

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Thanks for the help 👍

hoary peak May 26, 2019, 2:38 PM

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You're welcome I hope it works

sly nest May 26, 2019, 5:06 PM

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how can i make 2 ai on different teams attack each other ? im using the perception system but cant seem to figure it out and all the tutorials only make them attack the player and not each other?

patent hornet May 26, 2019, 5:08 PM

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attack or perceive, or is it the same thing in this scenario?

jaunty peak May 26, 2019, 5:53 PM

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@sly nest try using actor tags. if actor has 'tag' then attack, run away whatever.

gilded peak May 26, 2019, 10:10 PM

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can I use one behavior tree and one blackboard for multiple AIs? Something is wrong with mine and they start to block out each other.
doing stuff with C++ event broadcasts, maybe it is also that
does it get weird, If both Ais are using the same behavior node that subscribes to an event? Or is that no problem?

patent hornet May 26, 2019, 10:30 PM

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that made literally no sense 😦

gilded peak May 26, 2019, 10:38 PM

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mh??

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what made no sense?

patent hornet May 26, 2019, 10:52 PM

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none of it

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im guessing you said you have one AI controller with one BT broadcasting events to all the AI

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but i can't be sure

gilded peak May 26, 2019, 11:12 PM

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{    
    GlobalOwner = &OwnerComp;
    EBTNodeResult::Type NodeResult = EBTNodeResult::Failed;
    ACustomAIController* AIController = Cast<ACustomAIController>(OwnerComp.GetAIOwner());
    AAICharacter* AICharacter = Cast<AAICharacter>(AIController->GetPawn());
    EEnemyType AIEnemyType = AICharacter->GetEnemyType();
    
    AICharacter->StartFire();
    if (AIEnemyType == EEnemyType::Assault)
    {
        NodeResult = EBTNodeResult::Succeeded;
    }
    else if (AIEnemyType == EEnemyType::Covertaker)
    {        
        if (!AICharacter->FireEnd.IsBoundToObject(this))
        {
            
            AICharacter->FireEnd.AddUObject(this, &UAttackBehavior::FinishTask);
        }
        NodeResult =  EBTNodeResult::InProgress;
    }
    return NodeResult;
}

void UAttackBehavior::FinishTask()
{
    FinishLatentTask(*GlobalOwner, EBTNodeResult::Succeeded);
}

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sorry, trying for too long^^ this is my problem

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I think my delegate starts blocking other trees as soon as I have two or more AIs of the same type

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My question is essentially how I can ship around that problem

patent hornet May 26, 2019, 11:14 PM

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there is an option to instance all task nodes somewhere

gilded peak May 26, 2019, 11:15 PM

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mhhh, that might help

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I found that option, let's see if it helps

pine steeple May 26, 2019, 11:21 PM

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all blueprints nodes are instanced by default

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c++ nodes are shared by default

gilded peak May 26, 2019, 11:22 PM

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is it recommended to instance it by default then?

pine steeple May 26, 2019, 11:24 PM

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that depends what they are used for

gilded peak May 26, 2019, 11:26 PM

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it helped btw, thanks for that 😃

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I guess if they need unique data for each object?

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I now instantiated my cover location evaluation and my attack behavior, which solved quite a bunch of problems

torpid trout May 27, 2019, 10:12 AM

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Hey guys. I have AIPerception set up for my NPC. It is able to see my pawn and currently moves towards to it. But it is very easy to get out of the sight of the NPC.

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how can I solve this?

limber tiger May 27, 2019, 10:22 AM

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This is usually solved with a "Last Known Location" setup, where the players position is stored upon perception loss and the AI continues to that location. From there the AI can then either go into some sort of patrol, or hopefully, catches sight of the player again.

torpid trout May 27, 2019, 11:15 AM

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Wouldn't that make it really difficult to loose sight?

pine steeple May 27, 2019, 11:35 AM

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you would have it time out

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it would only know the last known position you were and go to that location

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once its there and doesnt spot anyone, it will go back to patrol

torpid trout May 27, 2019, 12:05 PM

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got it. thank you

sly nest May 27, 2019, 12:38 PM

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how can i make my ai spread out when they reach there target destination currently they just stop all in a line, i want the first ones that meet to start fighting then the other two at the back would reposition to attack each other

📎 unknown.png

limber tiger May 27, 2019, 12:56 PM

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There is a node, its something like "Get Random Reachable Point In Navigable Radius". It can be used to randomize the AI's destination within a definable range.

weary galleon May 27, 2019, 1:24 PM

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@sly nest Have a bool variable in the player controller (or character) called "bIsFighting" and when the first enemy that reaches the player (detect this using a box/capsule collision component maybe?) set that variable to true. Have the variable change only if either the enemy dies or moves out of the aforementioned collision area. Then create a condition in the AI Controller that tells the AI that if "bIsFighting" is true then they cannot come closer than a certain radius.

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You could set this radius as a variable and plug it into the acceptable distance for AI MoveTo

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Then the ones that are not fighting with the player could just fight themselves

sly nest May 27, 2019, 3:11 PM

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think ive found my problem. the sight perception trace is blocked by the first minion as you can see it detects me at the side and the first minion in front but not the one behind therefore it always selects the first minion as target

📎 unknown.png

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@weary galleon

weary galleon May 27, 2019, 3:14 PM

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Yeah so play with conditions relating to the location vector of the returned actors from your sight perception trace; should help them reposition.

sly nest May 27, 2019, 3:15 PM

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your not understanding the sight isnt detecting all the minions

weary galleon May 27, 2019, 3:16 PM

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Ah so you want the second gold one to detect the second blue one instead of the first?

sly nest May 27, 2019, 3:17 PM

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📎 unknown.png

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the debug is looking at the first gold player sight perception

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he should see me plus the two teal characters

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but the trace is blocked by the first teal character

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so only the first teal is added to the percieved array

weary galleon May 27, 2019, 3:18 PM

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And you're using the AIPerception for this?

sly nest May 27, 2019, 3:18 PM

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yeah

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it sees in a 90 degree arch but anything on the direct line gets blocked by first hit

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like if minion two was slightly to the side it would detect it

weary galleon May 27, 2019, 3:20 PM

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Create a custom MultiSphereTraceForObjects or override the AIPerception's trace function; that should help you detect multiple objects along a line.

sly nest May 27, 2019, 3:21 PM

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yeah but then im doing it manually and may as well not use the perception

weary galleon May 27, 2019, 3:22 PM

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Depends; if you're using a behaviour tree you'll need the perception for other things
If you're using C++ you should be able to override the AIPerception's trace

sly nest May 27, 2019, 3:25 PM

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hmm might just cheat and add sound on them that should pick up the missing

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ones

pine steeple May 27, 2019, 4:30 PM

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you should use EQS

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its what paragon used for its Minions vs Minions

weary galleon May 27, 2019, 5:58 PM

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@sly nest Yeah that would work

@pine steeple is right though, you should use EQS

It can take a little time to get the hang of though - personally

sly nest May 27, 2019, 6:02 PM

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ok i will check them out cheers

graceful saffron May 27, 2019, 9:12 PM

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Is there a way to slow down the perception or make it not run unless a player is nearby? Instead of despawning altogether

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I ran some tests on my little 1gb dedicated server, it can handle about 30 ai but after that the cpu maxes out haha

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Im guessing its all the tick perception stuff

fallen otter May 28, 2019, 5:43 PM

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Is there a better way to get an AI (in behavior tree) to check if its able to execute task A, execute it, then check task B, execute it, ect other than cascaded simple parallels?

slow bobcat May 28, 2019, 6:05 PM

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I think you just described a Sequence. You can have one and add a decorator to each task under it. The Sequence will stop once one child returns Failure/False, either because of your decorator or because of your task

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Something like this, but with a Sequence (sorry, I don't have unreal opened now)
https://answers.unrealengine.com/storage/temp/39488-btex2.png

fallen otter May 28, 2019, 6:12 PM

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@slow bobcat I would like for it to continue in the branch it is in if the current node returns false, however, I do not want it to stop if the first node it runs into succeeds. I want Task C to execute. A Selector would return after the first node, a Sequence would return after the second.

📎 example.png

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I guess whether I use Parallels or Sequences doesn't matter here though(with my current configuration).

slow bobcat May 28, 2019, 6:19 PM

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umm I see.
Selector: will stop at first Success
Sequence: will stop at first Failure

You want some sort of mixed node right? something that doesn't stop, it just executes everything.
There're different solutions. A common one is to create an Inverter Node, something that changes the "answer" of your task. You can have 2 decorators: one to check the condition and another that fakes the answer maybe?

Option 2 is to create your own composite node.

If it were up to me, I would review how I'm designing my AI. That kind of situation should be avoidable in most of the cases

fallen otter May 28, 2019, 6:23 PM

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@slow bobcat I have a support character for an arena combat game and she wants to use her most powerful to least powerful support abilities, assuming they're not on cooldown. Due to those abilities having different cooldown durations and different reasons why they may have fired earlier, this situation has arisen.

Ex: The most powerful ability is used, but the second most powerful ability might still be on cooldown, so she would want to execute her third most powerful ability instead.

How would you handle that?

slow bobcat May 28, 2019, 6:31 PM

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That sounds like a perfect case for an Utility Theory approach. There's tons of articles and videos on it (I think there are good ones from Dave Mark). Basically you create a system based on weights
i.e: 0% cooldown gives 1 point, 50% of cooldown gives 0.5 and 100% of cooldown gives 0 (you calculate other cooldown % points same way). Then you give a weight (points) to your abilities.
then you can add other weights to consider (power of attack, distance, mana consumption).

At the end, you will have a list of abilities that you can arrange from higher to lower points. Then your logic can say "Execute the 3 with more points".

Your BT will look something like a sequence with 2 tasks, one that calculates weights and another that executes the abilities.

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The tricky part is how and how many points you apply to each thing.

fallen otter May 28, 2019, 6:33 PM

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So the second Task would just be the bulk of logic? Executing multiple Tasks inside of itself?

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Or I guess the first one would be, since the second would just find the top 3 and run them.

slow bobcat May 28, 2019, 6:37 PM

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Yeah, for the sake of simplicity, the second task could just call a function (maybe in your AI Controller or in your Attack component or whatever fits your design) that executes the abilities. You don't really need a separated task for each thing.

For me a BT should try to limit itself as much as possible to "Just take a decision" . For the "action", I prefer to have that logic somewhere else. I like to keep my BT's as decision making.
I.E: conditions are meet (Decorator/Service), Attack (Node). But the node attack will not have all the attack logic. It will limit itself to call a function somewhere else.

But that's my approach. I know some people prefer the other one, where the BT even plays animations etc. It's really up to you

fallen otter May 28, 2019, 6:41 PM

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Right, mine is like yours. Utility Theory will be a great help as I prepare for my next game, thanks.

slow bobcat May 28, 2019, 6:47 PM

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There's a very good talk about this. I think it was during GDC few years ago and Dave Mark and other guy talked about utility theory in a strategy game (guild wars 2? ). Can't remember now. Try to find it, it's a good one.

graceful saffron May 29, 2019, 12:28 AM

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with lots of AI on a map, world tick time shoots up. Which part of the AI execution is on world tick time?

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nvm i think its part of the movement component

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okay yeah its mainly all the anim blueprints, character movement component, and AI controller

pine steeple May 29, 2019, 12:48 AM

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the CMC is heavy

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anim blueprints aint to bad if you optimize them

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ai controller is light unless you do a ton of stuff in Tick

graceful saffron May 29, 2019, 1:18 AM

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yeah I managed to get my fps back to 120 with 100+ AI on screen by basically just disabling a bunch of stuff when the player is out of range

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well i guess technically not on screen since the player isnt in view of them

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but still on the map

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wouldnt work if my game was an rts though. i could do a spawner/despawner thing but meh this works

livid beacon May 29, 2019, 8:49 AM

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I have a top-down style game. My native player character class uses SimpleMoveToLocation to take the character to a spot where the mouse clicked. I would like it so that, when the character arrives at that location, the character automatically moves on to another task. But to make that happen, I need it to figure out when the character has arrived at the location. One obvious way to do that would be in the Tick, in which I could check the character's location against the target location every tick. But I hate having stuff in the tick if there's a better way. Is there a non-tick way to trigger an event when the character arrives at the location using SimpleMoveToLocation?

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Another idea, I suppose, would be this: When the SimpleMoveToLocation is called, I could spawn a temporary actor with a collision sphere at the target location, and use it's OnOverlapBegin event to tell the character to begin the next task, and then destroy the temporary actor. But would spawning and destroying spheres be more expensive than simply checking every tick to see whether the character has reached the target location?

simple minnow May 29, 2019, 9:33 AM

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looking at the code, SimpleMoveToLocation adds a UPathFollowingComponent to your Character if it's player-controlled

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and there's a FMoveComplete OnRequestFinished; multicast delegate you can add a callback to, that should work @livid beacon

livid beacon May 29, 2019, 9:35 AM

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Thank you! That sounds perfect.

slow bobcat May 29, 2019, 10:02 AM

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Question about EQS:
I know they don't run in the game thread, which means we can run many queries with complicated logic and not affect our performance. But then, all I see is examples of people getting points in the level (cover points, run away routes etc).
What about other things , like "give me allies within X distance that meet conditions A, B and C".
Do you guys use it for that? Thoughts?

torpid trout May 29, 2019, 10:03 AM

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I have a NPC which moves to the last location the player once the player goes out of sight. It works most of the time but sometimes the player decides to move to a location beyond the given location. Why is that and how can I rectify this?

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the blue sphere is the given location but it goes boyond it as you can see

📎 5.png

slow bobcat May 29, 2019, 10:04 AM

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you mean the NPC moves beyond right? Sounds like you are refreshing the destination point

torpid trout May 29, 2019, 10:05 AM

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no the control only comes once

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I got it sorry it was detecting the sphere

graceful saffron May 29, 2019, 10:15 AM

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does lose sight radius not even work? I set it to 100 and still getting chased when im really far

torpid trout May 29, 2019, 10:19 AM

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it does work. Maybe its because of your code

graceful saffron May 29, 2019, 10:23 AM

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all im doing to test is a simple moveto behavior tree

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it never stops moving towards me even when i run really far and set lose sight radius to 100

torpid trout May 29, 2019, 10:26 AM

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are you able to see visually whether you are out of the loose sight radius?

graceful saffron May 29, 2019, 10:34 AM

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is there a debug setting for that or something

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i set it to 5 and still getting chased forever never losing sight even if i run behind rocks and whatnot

graceful saffron May 29, 2019, 10:54 AM

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okay yeah I activated the debugger, clearly out of the lose sight radius but still coming after me

pine steeple May 29, 2019, 11:10 AM

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loose sight doesnt auto stop the ai from chasing you

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you need to handle what happens when the sight is lost

graceful saffron May 29, 2019, 11:12 AM

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ah okay thanks

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but i guess my AI never loses sight

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thats the issue

vast jacinth May 29, 2019, 12:17 PM

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https://1drv.ms/v/s!AriD4q-5KFPlip1xct662v70VLIeNA

2019-05-29_14-13-44.mp4

MP4 File

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I'm trying to regenearte the navmesh once I drop a carried item. The item has navmesh modifier, is set to dynamic, so is the setting in the project. When it's carried the modifier area class is set to default when dropped back to null.

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For some reason it doesn't regenerate the navmesh after dropping, but when I eject and move the item manually it does it immediately?

mystic dock May 29, 2019, 2:19 PM

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Maybe your actor is actually snap back to the previous location when you drop the box, that's why it shows up on the navmesh once again. But anyways, are you using dynamic navmesh generation? Static might not going to work for your use case.

vast jacinth May 29, 2019, 2:53 PM

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Just got it working. I was setting the same nav modifier, which for some reason does not re-generate the navmesh. When I delete at pickup and then add new one at drop it regenerates more or less as expected 😃

mystic dock May 29, 2019, 2:56 PM

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I also have found that instanced meshes wont trigger updates in navmesh (in a cooked server). So i guess there are multiple issues with navmesh after all.

vast jacinth May 29, 2019, 3:52 PM

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yeah, not the best of experience with navmesh. But can't write anything better myself so will have to go with the flow 😃

patent hornet May 29, 2019, 5:58 PM

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@slow bobcat EQS is made of a generator, filters and scorers

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so sure, your generator can be something that gets allies within 30000 UU

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off GameThread or no, i'd still avoid using a sphere overlap to populate the list

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after that come the filters, which you should arrange in order from cheapest/most effective ones first

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example: if you're searching for an attack target, checking for a simple boolean (isDead) would go before say (IsPathPassable)

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and then you take whats left and score it however you feel is right

slow bobcat May 29, 2019, 6:01 PM

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hi! Thanks for the answer. I ended up reading the source for it and writing some custom generator. What you described is what I understood and ended up doing. The only part i'm not clear enough is the use of this

/**
 * AIDataProvider is an object that can provide collection of properties
 * associated with bound pawn owner or request Id.
 *
 * Editable properties are used to set up provider instance,
 * creating additional filters or ways of accessing data (e.g. gameplay tag of ability)
 *
 * Non editable properties are holding data
 */

USTRUCT()
struct AIMODULE_API FAIDataProviderValue

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this is an example of use in the generator for actors of a class

/** If true, this will only returns actors of the specified class within the SearchRadius of the SearchCenter context.  If false, it will return ALL actors of the specified class in the world. */
    UPROPERTY(EditDefaultsOnly, Category=Generator)
    FAIDataProviderBoolValue GenerateOnlyActorsInRadius;

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don't fully understand the comment or why isn't that just a regular bool

patent hornet May 29, 2019, 6:07 PM

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looks like a system that uses reflection to get around needing to have an interface

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if you have disparate set of 20 different actor classes with no common interface and all of them having a UPROPERTY() float Health;

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that could actually access it by Name

slow bobcat May 29, 2019, 6:12 PM

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umm that makes sense...

rigid hawk May 29, 2019, 6:26 PM

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Can someone help me? What should i connect to work?

i want the deer to move to a location.
and how can i import animation to that bp?

📎 szarvas.png

patent hornet May 29, 2019, 7:48 PM

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did you really just reference the controller to get its pawn?

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GetController() doesn't work from ASkeletalMeshActor

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it works only from APawn derived classes

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and if this was a Pawn you could just had put "Self" into that pin

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also, if it was a Pawn, you could not do GetController() from BeginPlay, as it doesn't have one yet

mystic dock May 29, 2019, 7:50 PM

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That actually is not neccessary, the target pin is assigned to self autoamtically (if not connected)

patent hornet May 29, 2019, 7:50 PM

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you'd have to use OnPossessed

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its not a Target pin

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its a Pawn one

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so, in short @rigid hawk SkeletalMeshActors aren't going anywhere, except if you do SetActorLocation

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they have no MovementComponent, no Pawn interface, they can't be possessed by a Controller, which also means they have no PathfollowingComponent either

misty osprey May 30, 2019, 5:36 AM

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hey guys, I use the old pawn sensing and BP code, as soon as the ai sees me and runs the code the frames drop to 30, would redoing it to the new AI perception and BTs make a better performance result?

patent hornet May 30, 2019, 5:58 AM

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possibly, but given that description, its not the old sensing system, its your code that performs badly

misty osprey May 30, 2019, 5:59 AM

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okay hmm, yeah if its one or two enemies thats no problem but if 5 or more its drops badly.

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but there is also a lot of stuff on the map so

patent hornet May 30, 2019, 6:00 AM

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that is what the profilers are for

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there are also a few caveats if you're testing in editor

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like if you have a blueprint debugger open, it will eat a shitton of resources

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output log is also horrible for performance

misty osprey May 30, 2019, 6:06 AM

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I will look into the profiler, the thing is it could be also something else. I made a adjustment to the code and now its way better when it comes to the AI, there was an expensive casting.

patent hornet May 30, 2019, 6:09 AM

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casting can't do that

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checking 50 different points for being reachable by navmesh in convoluted for loop on tick

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thats the kind of code that causes such a massive FPS drop

misty osprey May 30, 2019, 6:19 AM

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yeah I´m not doing massive code stuff, its probably something else.

livid beacon May 30, 2019, 7:44 AM

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I had a problem yesterday that @simple minnow helped me resolve. It took me a couple hours of detective work to solve it even once he pointed me in the right direction (I'm slow), so I thought I would report on my solution in case anyone has a similar problem and searches here. Basically, when I use the player controller (not AI controller) to run SimpleMoveToLocation, I want to get notified when the player character arrives at the location so that I can start them on their next task. Comparing the player character's location to the destination location every tick would have worked but would have been unnecessarily cumbersome. So here is the solution that @simple minnow helped me come up with. When you run SimpleMoveToLocatoin, it adds a UPathFollowingComponent to your player controller. So I created a UPathFollowingComponent pointer variable (let's say it's called PFC) in the player controller header. In the player controller .cpp, right after I call SimpleMoveToLocation, I then check to see whether PFC is nullptr. If it is nullptr, I set it to the PathFollowingComponent that was just created by SimpleMoveToLocation, with this code:
PFC = this->FindComponentByClass<UPathFollowingComponent>();
Right after that, I bind the component to the "OnRequestFinished" delegate that exists within the UPathFollowingComponent as follows:

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PFC->OnRequestFinished.AddUObject(this, &MyClass::OnMoveCompleted);
Next, I declare and define a function for OnMoveCompleted that tells the player controller to start the next task when the delegate is received.
There are a few #includes that go along with all of this, but this should get someone going if they have the same problem I did.

simple minnow May 30, 2019, 7:47 AM

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@livid beacon I think if you add the path following component at construction, it’ll use that one rather than creating a new one

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Since it does check if the PC already has one before making it

livid beacon May 30, 2019, 7:48 AM

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Great suggestion. That will simplify it. Thanks!

misty osprey May 30, 2019, 7:57 AM

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okay guys just for the record, cull distance of foilage is 0 by default. that was destroying my fps. the AI is no problem at all.

mystic dock May 30, 2019, 10:52 AM

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Mentatz by using the procedural grass system you can have much better control over the grass which is a usual issue with foliage

graceful saffron May 31, 2019, 12:29 AM

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if you want high fps, dont use too much foliage in your scenes especially if youre doing open world

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overdraw will kill your fps

misty osprey May 31, 2019, 3:44 AM

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yeah I could fix it with some more optimization so far but the disabled culling was a huge problem, what I could figure out is that the AI will cause a tick event when placed in the level which drains a lot fps. so I think I will spawn most of them by a trigger volume or I try if I can maybe enable/disable them by volume.

maiden plume May 31, 2019, 1:28 PM

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Can someone help me plz?

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My combat state never triggers even though its supposed to.

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and just keeps going to the root

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https://cdn.discordapp.com/attachments/556557518365786133/584010071676026920/unknown.png

jaunty peak May 31, 2019, 2:11 PM

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You'll need to check in game with the debugger showing, that way you'll know what values are getting altered. If the middle isn't firing it's because the variables are telling it not to.

midnight quartz Jun 1, 2019, 1:11 AM

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Does anyone know why UNavigationSystemV1::FindPathToLocationSynchronously would fail (returned UNavigationPath::IsValid() returns false) if the starting point is on a ramp? The ramp is fine without checking the validity of the path when the AI has to path over the ramp, has to path to a location on the ramp and pathing to a location off of the ramp. The problem is checking the validity of the path using UNavigationSystemV1::FindPathToLocationSynchronously when pathing from a location on the ramp to a location off the ramp. Hopefully I am missing something that someone else has solved. Thanks!

📎 unknown.png

thorny crest Jun 1, 2019, 12:11 PM

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i have absolutely no idea why, but none of my nav meshs will generate navigation in this project no matter the set up

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it works fine in other projects, but this one just doesnt generate navigation

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i even copied a nav mesh from the other project just to see if my settings for it was wrong but it still did nothing

midnight quartz Jun 1, 2019, 4:43 PM

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@thorny crest that happens to me every once in a while. The order that I try to solve it is: 1) Build paths (this rarely works but it's the easiest), 2) Move the Nav Mesh Volume slightly. This sometimes works. 3) delete and re-add the nav mesh volumes. #2 is what works the most. Hope that helps.

thorny crest Jun 1, 2019, 4:44 PM

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ive already done all that

robust bridge Jun 1, 2019, 6:56 PM

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Is anyone here really good at recast?

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I'm struggling with a problem right now where I want my generated navmesh paths to be furhther from the navmesh edges

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I can make this happen by increasing agent size, but then my agents will not plan paths via corridors where they actually fit, but won't plan because of the increased size

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I've been crawling the code of detour and recast the last day or so looking for some setting or place where I can implement this, but so far, no dice 😃

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Would love some insight if anyone has already solved this problem before!

robust bridge Jun 2, 2019, 12:24 AM

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TaBeRu

robust bridge Jun 2, 2019, 1:02 AM

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Oh, it was really simple, our friends at Epic have already implemented it, and exposed it on the dtCrowd class. Noice

deep iris Jun 2, 2019, 2:39 AM

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As I asked, how would you make a monster passive to the player and hostile to another monster @trim sleet

trim sleet Jun 2, 2019, 2:41 AM

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@deep iris There's lots of ways that you could do that depending on how your AI is set up. For example you could have a reference to the player and in your AI behavior tree tell it to ignore the player when choosing a target.

deep iris Jun 2, 2019, 2:42 AM

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How?

deep iris Jun 2, 2019, 3:17 AM

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@trim sleet How do I tell it to ignore the player?

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And also be able to damage other monsters

white oasis Jun 2, 2019, 3:50 AM

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Hello I need some help with my AI my AI is done but it does not chase me and I get a tone of errors if can pls help me in DM's

jaunty peak Jun 2, 2019, 10:31 AM

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@deep iris use actor tags. give your player a unique tag, give your npcs/monsters a unique tag. Then just check if the percieved actor has whatever tag.

pine steeple Jun 2, 2019, 11:23 AM

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err don't use actor tags

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use gameplay tags atleast

jaunty peak Jun 2, 2019, 11:42 AM

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ahh. Good to know. Whats the logic behind that? performance?

pine steeple Jun 2, 2019, 11:45 AM

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Maintainability, can be replicated/changed

jaunty peak Jun 2, 2019, 11:59 AM

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Cheers, good to know. I've not messed with replication so didn't even consider it.

uncut viper Jun 2, 2019, 3:01 PM

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hi this might be stupid question but why some have a green face and other a red devil face when i inspect the AI ?

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can't find a proper answer online

gilded peak Jun 2, 2019, 5:24 PM

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I found a very weird problem.....
So I set my player as an object in a blackboard key, then I let my AI turn towards that set object. If my camera is closer to my AI than my actual player model, the AI will turn towards the camera, instead of the model. this results in my ai missing all it's shots. As soon as I eject in the editor, the problem is solved....

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anyone ever encountered this or has a clue how to prevent it?

gilded peak Jun 2, 2019, 6:10 PM

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okay, the issue is actually a problem that if rotating to an object key in a behavior tree the AI seems to rotate to the closest point which can be the camera. I reproted this as an issue since it doesn't feel right. I suppose it should be the actor root instead

pine steeple Jun 2, 2019, 6:18 PM

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did you look at the code to see how it works?

gilded peak Jun 2, 2019, 6:27 PM

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I did and couldn't completely nail down the problem since it seems to be lying deeper. The node referes to the actor location and the actor location referes to the root component. After trying it out for over a day and tracking down locations, I found out however that there must be a problem with either determinating the root component or determinating the root component specifically for the character class, since it always refered to the camera location if that one was closer to the object requesting that information, which is very very annoying

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it took me however quite long in the first place to find out that the rotation location is wrong, since I was suspecting that my camera however blocked the bullets from my AI enemies (which was why I found the problem in the first place)

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hacked my way around it, rotate towards the mesh location and not the object ... still not cool

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also, when ejecting from the character the issue was gone, what made me suspicious

uncut viper Jun 4, 2019, 4:36 PM

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how would one, describe the logic for an AI player, to decide when to spend points to spawn units or to wait for some time to gather enough of said points to buy a spawning point?

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code wise or behavior tree wise, what is the key factor here? trying to figure this logic out

lyric flint Jun 4, 2019, 4:39 PM

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what would be the condition under which he rather buys a (new?) spawning point than buy new units?

uncut viper Jun 4, 2019, 4:39 PM

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should i just RNG into waiting for said amount of points to buy a spawning point ?

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that's what i'm trying to figure out as pure logical reasoning, 1st time doing AI

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he has a pool of points (gets more by killing creeps, player and capturing turrets)

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then how would i decide if he should wait to gather 30 points for a spawning point or waste 1 point per spawned creep

lyric flint Jun 4, 2019, 4:42 PM

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would have plenty factors i suppose

uncut viper Jun 4, 2019, 4:42 PM

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plus spawning creeps at the new spawning point costs twice as much so 2 points per creep

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what comes to your mind ?

lyric flint Jun 4, 2019, 4:43 PM

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mostly enemy states

uncut viper Jun 4, 2019, 4:43 PM

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cuz this is not an agro move for me to say only if it's on hard difficulty he should try and gather the points

lyric flint Jun 4, 2019, 4:43 PM

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such as how many enemy units, how many enemy/own towers, spawn points

uncut viper Jun 4, 2019, 4:43 PM

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ah, good one, so if i have quite a few creeps, then gather the points until they fall below a certain threshold

lyric flint Jun 4, 2019, 4:44 PM

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and it would need complex algorithms to figure out how many creeps are needed to keep it even so that a new spawn point can be placed

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like i dont know if there are even different creep types

uncut viper Jun 4, 2019, 4:45 PM

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there can be only 4 spawn points, buy once for the entire match kind of system, 1st come 1st served

lyric flint Jun 4, 2019, 4:46 PM

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also there should be something like goals, like try to get a new spawn point at each x time phases to ensure growth

uncut viper Jun 4, 2019, 4:46 PM

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i could give you a video of the original game im trying to do in UE4 to teach myself the engine if you have a few minutes and are interested

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good point

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so i need a time plotted chart of some sort, but would be tricky to code that as the match can evolve in either direction (favor 1 player over the other) but very good point non the less

lyric flint Jun 4, 2019, 4:47 PM

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So primarily there are the "goals" or the "rigged" system: Build spawn points at certain times, spawn so and so many minions in certain time ranges.

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Then there should be factors that define when the AI differs from this rigged behaviour

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Like rather buy more minions at critical phases than buy a spawn point that would usually have been bought

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Or buy a spawn point sooner if it does well

uncut viper Jun 4, 2019, 4:49 PM

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ok this will get me started, thanks @lyric flint

lyric flint Jun 4, 2019, 4:49 PM

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@uncut viper Sure thing you can send me the video link per pm but i got pretty slow internet stick internet rn

regal willow Jun 4, 2019, 5:28 PM

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https://gyazo.com/93600110b19d41577c86e518c30a1769

Gyazo

▶ Play video

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Help.

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please

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no idea why

pine steeple Jun 4, 2019, 5:33 PM

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you are not getting any help by just saying help please and a video

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describe what you are doing and show some blueprints/code.

regal willow Jun 4, 2019, 5:35 PM

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sorry i have him to follow me using a very basic ai move to and he does this when pawn sensing goes off

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https://gyazo.com/088bdfb805f9852e25795591dea5a00a

Gyazo

lyric flint Jun 4, 2019, 6:43 PM

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Hi, just a small explaining, my friend and i are making a game, we use github to use the same file (OriginalFile), where the map is, and all the other stuff. Im making the AI and his making the map, so we decided that i should make the AI in another copy of the map, and then only transfer the file where the AI is, through GitHub. So i made an Ai, and i dont get any error when i exit the play mode, on the my NPCFactory (where i make the NPCs, i got all the files, that the OriginalFile has, the only thing that i erased was the map, and added a surface nothing more). But when i exit the play mode on the OriginalFile, i get multiple errors (image below), and i dont know why. I carefully looked through all my NPC files on the OriginalFile, and nothing is wrong, but i still get this errors. Pls Help.

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http://prntscr.com/nxlws2

Lightshot

Screenshot

Captured with Lightshot

midnight quartz Jun 4, 2019, 6:44 PM

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@regal willow have you tried not using both 'Destination' and 'Target Actor'? Try just the 'Target Actor'.

lyric flint Jun 4, 2019, 6:44 PM

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http://prntscr.com/nxlx2w

Lightshot

Screenshot

Captured with Lightshot

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http://prntscr.com/nxlx8h

Lightshot

Screenshot

Captured with Lightshot

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where the errors are located

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this is inside the ai brain

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blueprint*

pine steeple Jun 4, 2019, 8:18 PM

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@regal willow Tip1: Don't use PawnSensing

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@lyric flint anyreason why you are using them nodes?

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they way i wrote my ai system, is have a service, which pulls the values it needs from the controller/ai

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and have the behaviour tree update

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i have around 25 AI monsters (all different) and never ever used Set Value as Float etc using a string

lyric flint Jun 4, 2019, 8:21 PM

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i was following a tutorial, and it worked on the other file

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@pine steeple

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https://www.youtube.com/watch?v=bZPcWjyW9Ro&t=442s

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 p...

▶ Play video

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this one

pine steeple Jun 4, 2019, 8:23 PM

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yeah just saying i dont trust tutorials like that

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your behaviour tree can handle waiting

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after reaching a waypoint

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your behaviour tree can get a waypoint, move to it, wait

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without needing to do what your doing

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just seems a bit convulated what is happening

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so explain to me what you are trying to do

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make a ai move to a set of waypoints?

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and just keep looping through those way points

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or is it just two waypoints and he patrols them two waypoints?

lyric flint Jun 4, 2019, 8:27 PM

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yes, then stops when sees the player and then throws a arrow

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and keeps throwing when until he doesnt see the player anymore

pine steeple Jun 4, 2019, 8:29 PM

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seems simple enough

pine steeple Jun 4, 2019, 8:48 PM

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@lyric flint

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📎 bJy5HLYKCT.mp4

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bit like that/

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?

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20mins 😄

lyric flint Jun 4, 2019, 8:51 PM

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does he do: 0 1 2 1 0 in a loop? if yes then yep 😄

pine steeple Jun 4, 2019, 8:51 PM

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well you can modify the way points

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and the calculations

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ill send you this over

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so have a little look

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see if you can get any inspiration

lyric flint Jun 4, 2019, 8:52 PM

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only have 1 month in UE4 and im the "chief" og the AI's xD

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of*

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in the project

pine steeple Jun 4, 2019, 8:52 PM

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ai is awesome

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i wrote custom perception senses, complete aggro system based on recieved perception

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😄

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https://we.tl/t-JkERgXgRKm

MyProject.zip

1 file sent via WeTransfer, the simplest way to send your files around the world

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here take a look

next plover Jun 4, 2019, 9:01 PM

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Thanks a lot, I'm the one working with Trode, I will look into your project, so far the AI was working as intended even though I did not understand the need behind converting to Bools / float, but he did show me the AI working fine on his offline project

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I was wondering if it was due to copy pasting instead of migrating

pine steeple Jun 4, 2019, 9:02 PM

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i mean you should be using Services to handle fetching stuff from the controller

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not the controller sending stuff to the blackboard

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plus you can use blackboardkey selectors

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in BTTasks/Services/Decorators that link to the proper value

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just have a look at what i did, maybe it can help you understand a bit more

lyric flint Jun 4, 2019, 9:04 PM

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thank you

pine steeple Jun 4, 2019, 9:05 PM

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bear in mind, i wrote that in 20mins

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😄

next plover Jun 4, 2019, 9:16 PM

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so in your get next waypont function you are basically asking what's the nearest waypoint and moving there?

📎 unknown.png

pine steeple Jun 4, 2019, 9:19 PM

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just looping through

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one waypoint after another

next plover Jun 4, 2019, 9:19 PM

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yea nvm

lyric flint Jun 5, 2019, 3:44 PM

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how do i make the AI which uses simple move to actor try to follow the player it can't reach? Right now it just stops if it can't find a path to the actor it is supposed to follow.

next plover Jun 5, 2019, 4:30 PM

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Is there any way to build a navmesh with custom geometry? or point by point? It's a super hard to control where AI can walk with only using cubes (even with subtractive cubes) would I have to code my own system for this?

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basically I want to be able to draw my navigation volume like this

📎 unknown.png

pine steeple Jun 5, 2019, 4:35 PM

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not without putting a modifier over terrain you dont want accessible

next plover Jun 5, 2019, 4:49 PM

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but does the modifier need to be a cube?can't I use a triangle/cilinder shape for example

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maybe it could be easier by defining walkable surface and non walkable depending on what mesh it is

stark zealot Jun 5, 2019, 5:34 PM

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I have a simple zombie ai that gets the closest player to him and chases after him using the AiMoveTo node. My problem is that when a player is falling or gets in a non-navigatable spot the zombies just stop moving. I was wondering if I should move my logic to a behavior tree or if I should just add in a constant check that gets the last navigatable location of the player and just move there on fail to move to?

mystic dock Jun 5, 2019, 5:42 PM

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You can move the ai without projecting destination to nav, it will throw you an Abort (i think) when loosing the target

stark zealot Jun 5, 2019, 5:43 PM

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I'm not sure what that means

mystic dock Jun 5, 2019, 5:46 PM

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When the AI stops moving it will throw you an event, which has this ENUM that tells what happened. Your movement implementation can deal with these different circumstances and try to figure ways around to continue chasing your character.

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It's not a "put two nodes and youre done", i have spent weeks on trial and errors - and it still is not good enough but i went dealing with other things in game

stark zealot Jun 5, 2019, 5:48 PM

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Ah ok, that's interesting. I wouldn't think my case would be that difficult since it's just a dumb zombie ai like the ones in Call of duty zombies. But there I go "thinking" again lol

mystic dock Jun 5, 2019, 5:51 PM

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For now you can try a move node that has the checkmark "project destination on navmesh" and uncheck that. It should continue walking towards the character i believe.

stark zealot Jun 5, 2019, 5:55 PM

#

IDK if this is right but here's what I got for the chasing part. https://i.gyazo.com/f7a4544a539d394ab55f054809711757.png

mystic dock Jun 5, 2019, 6:04 PM

#

This node has no checkmark to disable the projecting of destination on the navmesh, find another one

#

Also this logic doesnt really makes sense to me :)

#

Delay on tickdelta, and then what. It will stop moving anyways.

stark zealot Jun 5, 2019, 6:09 PM

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Like this? https://i.gyazo.com/94123e1529787f0997cdf9658f259d81.png

stark zealot Jun 5, 2019, 7:21 PM

#

@mystic dock So I got rid of that crappy logic and made a behavior tree and instead of moving to actor or location I just got a random navigable point and move the ai there. It seems to fix issues such as the AI standing still when a player is falling, or if a player is on a floating platform above where ai can't get. The Ai will still move towards the player even though they can't reach him, it looks and feels more realistic whereas before the ai would just stop and stand there lol. IDK if this is the correct way to do it but it works for now. https://i.gyazo.com/0eef073de6fcd8b6ad55f1139f6fec02.png

digital cairn Jun 5, 2019, 11:21 PM

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I might have a strange question... Is there a way to set a default navmesh cost to something else than 0? I want to have a low cost nav areas(roads) but the navmodifier value cannot go below 0...

pine steeple Jun 5, 2019, 11:42 PM

#

no

#

its a uint so you cant go below 0

#

uint is 0>

digital cairn Jun 6, 2019, 12:08 AM

#

Well that is what I know 😃 my question is if the default value can be changed...so I can use the modifier to set it to 0 in desired places 😃

vagrant summit Jun 6, 2019, 5:25 AM

#

is it possible to force an AIPerception sense to forget something? Even if the Max Age has yet to elapse?

patent hornet Jun 6, 2019, 6:51 AM

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@digital cairn the important bit is the cost of modifiers relative to each other

#

so not quite sure why you're set on forcing them to <= 0

digital cairn Jun 6, 2019, 8:28 AM

#

I am not set on forcing them to 0 I am set on having a path of relatively low cost area compared to the entire map. And as far as I tested combining modifiers does not pick one or the other. I can obviously forcefuly by hand create modifier volumes that are outside of the "low cost" zones, but it would just be plain easier to set the default cost of unmodified navmesh to 1 and the low cost area to 0 using the modifiers :). But I might just be thinking about this wrong

#

And the numbers are just random values. obviously I could set the default to 3531 and the low cost to 1536

misty holly Jun 6, 2019, 1:09 PM

#

Animations not working for walking in my ai but the walking animations work fine when I use them for a playable character any suggestions?

red tapir Jun 6, 2019, 1:12 PM

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Ping me too if there's a solution

red tapir Jun 6, 2019, 2:28 PM

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Since I'm doing progress on it myself, it seems like the AI is simply having 0 acceleration at all times

#

@misty holly in the CharacterMovement component, set the "Use Acceleration for Paths" to true

📎 unknown.png

#

It makes my AI run now, but there's some tweaks to be done about movement

misty holly Jun 6, 2019, 2:30 PM

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yeah i did that already 😦

red tapir Jun 6, 2019, 2:30 PM

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Oofers

misty holly Jun 6, 2019, 2:31 PM

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thx tho @red tapir

pine steeple Jun 6, 2019, 4:06 PM

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@misty holly @red tapir show me how your getting the speed

#

sorry meant to ping @misty holly only :/

misty holly Jun 6, 2019, 4:36 PM

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@pine steeple is this want you were reffering to?

📎 unknown.png

pine steeple Jun 6, 2019, 4:37 PM

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and what is the value that comes out

#

the FVector?

misty holly Jun 6, 2019, 4:39 PM

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not sure what you mean 😦

red tapir Jun 6, 2019, 4:39 PM

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📎 unknown.png

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IsAccelerating is fed into Idle-to-Jog transition

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The actual transition

📎 unknown.png

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"Actual Velocity" is a value to help me do slope animations, you can replace it with a simple Character->Velocity

pine steeple Jun 6, 2019, 4:50 PM

#

did you put print

#

to see what values you are getting from your variables?

#

@red tapir don't use casts and stuff inside a transition node

#

its very very bad

#

store the value locally on the animbp inside UpdateAnimation

#

store actual velocity locally on the animbp via the above mentioned function, and then access it

red tapir Jun 6, 2019, 5:15 PM

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I was just done making the BP itself

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So it's full of bad/no optimizations

vagrant summit Jun 6, 2019, 5:54 PM

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Cool so Get Known Perceived Actors is still bugged in 4.22

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https://answers.unrealengine.com/questions/784437/get-known-perceived-actors-doesnt-work-properly-on.html?sort=oldest

harsh nova Jun 6, 2019, 6:32 PM

#

My character is not playing animations after making him move about in the map, help please

lyric flint Jun 6, 2019, 10:22 PM

#

hi, im trying to make a tile, that if its in the ground goes up and then goes to the main charater location. I tried a simple move to location but i doesnt work. probably is wrong.

#

Here is the simple to location part

📎 unknown.png

#

before that i have a spline and aiperception and works fine, i've tried with ai perception and simple move to location too

#

and it didnt work

#

the spline is so is goes up, like Zelda tiles

#

im using an actor

patent hornet Jun 6, 2019, 10:33 PM

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Actors don't have AIControllers

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or movement components

deft sedge Jun 7, 2019, 11:38 AM

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using ai perception system, hearing stimuli is always returning false for successfully sensed but can see in debugger that it is receiving the noise event.

#

if i don't check successfully sensed and print the strength of the stimuli it shows a -1?

#

📎 unknown.png

#

📎 unknown.png

#

this works correctly in another project too

deft sedge Jun 7, 2019, 12:19 PM

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AHA

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here is the answer

#

📎 unknown.png

pine steeple Jun 7, 2019, 1:54 PM

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i am really thinking of re-writing the perception system, but not sure what epic has up their sleeve for Navigation V2

#

it can be re-written so much better

fallow hound Jun 7, 2019, 4:08 PM

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I didn't know epic was still working on ai

simple minnow Jun 8, 2019, 12:50 AM

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hmm if i want to write a Behavior Tree Service in C++, am I supposed to inherit from UBTService_BlackboardBase or UBTService

patent hornet Jun 8, 2019, 12:50 AM

#

i usually go for BBBase

#

i can't say i do know the difference tho

simple minnow Jun 8, 2019, 12:51 AM

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it seems like only difference is it has a BlackboardKey selector

#

which I dunno what that's for anyway

patent hornet Jun 8, 2019, 12:51 AM

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that is for mapping to blackboard data

#

any exposed BBKeySelectors are going to show on the nodes details panel

simple minnow Jun 8, 2019, 12:52 AM

#

ah, okay

patent hornet Jun 8, 2019, 12:52 AM

#

and you can map them to blackboard entries via a dropdown

#

then you can do Get/SetBlackboardValueAs<Type> from them inside the task/decorator/service

#

basically lets you reuse a task/decorator or service in different BTs with different BBs

#

with just a simple config

simple minnow Jun 8, 2019, 12:55 AM

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right, so definitely will want that in most use cases

patent hornet Jun 8, 2019, 12:55 AM

#

yeah

#

if you write a c++ base use EditAnywhere for stuff you want to edit

#

as task nodes inside a BT are instances

#

anything you do expose like that will be editable in node's details panel

#

allows you to configure tasks/services

#

WFT is? videos are pretty thorough, i do recommend if you didn't do unreal BTs before

simple minnow Jun 8, 2019, 1:07 AM

#

alright cool, I'll look at those if I get lost

unborn jungle Jun 8, 2019, 2:24 PM

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The AI code for UT is super complicated, so much stuff running on tick!

#

Do you think they started from scratch or ported over the older UT game AI code to start with as a base?

near jetty Jun 8, 2019, 2:28 PM

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its ported over @unborn jungle

#

or fairly similar

unborn jungle Jun 8, 2019, 2:28 PM

#

Ah ok thanks

#

Interesting that they don't use behavior trees or have a general state defined

#

It's quite technical but very interesting to see

near jetty Jun 8, 2019, 2:30 PM

#

behavior trees suck for those kind of ais

#

like.. really suck

#

BTs are at its absolute best for "simple" enemies with direct combat patterns

#

in there they absolutely excel

#

for example, you could make every single AI in the entire world of warcraft, in small BTs. Super easy to do and iterate with

unborn jungle Jun 8, 2019, 2:36 PM

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@near jetty So as soon as they are worrying about multiple things at once (navigating to pickups, WHILE targeting AND dodging etc)

#

It's better off done in code without BTs?

#

Just seeing how bloated ShooterGames's AI is because of all the blackboard checks / setters etc.

#

I don't feel it's even worth doing it in a BT

#

I feel as long as each component (vision, movement, pickup needs) are nicely separated and easy to debug, it's probably much cleaner to do it in code

near jetty Jun 8, 2019, 3:13 PM

#

yes

#

shootergame AI is terrible

#

but thats kind of the issue. You have several multiple decision processes at once

#

this stuff can be done in BTs, but it sucks

unborn jungle Jun 8, 2019, 7:18 PM

#

@near jetty Many thanks for clarifying, I was really hesitant to use BTs for more complicated shooter AI but of course every example / tutorial uses them

#

Will stick with code in this case

#

Will try having a separate enum for each of the necessary states (vision / movement / loot needs etc.) and have each segment running separate logic that intertwines when it needs to (like finding a health pickup when low overriding any movement logic set from combat until healthy again)

near jetty Jun 8, 2019, 7:32 PM

#

put your generic logic in components

#

highly recomended

unborn jungle Jun 8, 2019, 7:48 PM

#

Good idea!

#

AIVisionComponent

#

Etc

#

Thanks

near jetty Jun 8, 2019, 7:58 PM

#

indeed

#

i have my Aggro component, Melee combat component, ranged combat component, etc

#

and those have different properties and callbacks

lyric flint Jun 8, 2019, 9:42 PM

#

is there a way to see the radius of the ai perception on the map?

patent hornet Jun 9, 2019, 12:13 AM

#

press '

#

while in PIE

unborn jungle Jun 9, 2019, 1:48 AM

#

Anyone notice AI using the navmesh only sometimes in the last few engine versions?

#

Forcing a navmesh rebuild (build paths) always gets it to work again but it's very strange

#

I can play the same map without closing the editor 3 times, and on the 4th time (not moving the navmesh or anything at all in the map since the first play), the AI will just not move

#

Hoping this doesn't affect builds and is only in editor

uncut viper Jun 9, 2019, 10:23 AM

#

hi, can you have an array in the Blackboard ? can't find a way to do it

#

a solution would be to use a BP proxy that holds the array but that's just hard to read / follow and not as clean

#

i want to cache a list of outposts from which the AI would know to iterate thru and spawn units from them

patent hornet Jun 9, 2019, 11:27 AM

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you can have a UObject* @uncut viper

#

there is some indirection, but it will work

uncut viper Jun 9, 2019, 11:29 AM

#

yeah but the underlining behavior tree nodes don't allow me to set blackboard value as array there are only a small predefined primitive types like bool, string, int etc

#

📎 unknown.png

#

should i just use object even tho i pass array ? let me check

patent hornet Jun 9, 2019, 11:30 AM

#

you can make an object that has the array

uncut viper Jun 9, 2019, 11:30 AM

#

📎 unknown.png

#

ah

#

📎 unknown.png

#

like such ?

patent hornet Jun 9, 2019, 11:32 AM

#

adding custom support for array would be more then a little complicated

#

the 2nd one, yes, you make an object class that holds the BB data not directly supported by the BB

#

note: that data doesn't have to be in a blackboard

#

i'll give a trivial example

#

say you add an OutpustManager component to your GameState

#

say all your outposts on BeginPlay, GetGameState()->GetComponentByClass<UOutpostManger>()->Register()

#

your OutpostManager has Register and Unregister functions that Outposts can call to add or remove themselves from the Manager

#

and an array of Outposts

#

result: you now have a statically accessible OutpostManager that has the array of Outposts

#

all that is left to do is add a static function (BPFunctionLibrary) that does return GetGameState->GetOutpostManager->OutpostArray;

#

call it GetOutposts

#

and you can then use it to pull the array of outposts, without requiring any references, from any BP that has a World

uncut viper Jun 9, 2019, 11:38 AM

#

i see, thanks will follow what you have described as i'm still trying to clean the project up to be more inline with the UE4 guidelines of GameMode, GameState, PlayerState etc

#

yep sounds good, thanks @patent hornet

patent hornet Jun 9, 2019, 11:39 AM

#

it doesn't have to be GameState, it just has to have a unique instance for that World

#

we have a LevelManager actor, just the one on a level, which has those components

#

the GS example is simpler tho

uncut viper Jun 9, 2019, 11:40 AM

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yeah like in Unity i know the concept of managers, but still trying to push myself to those guidelines if we already have a format unique to UE4 might as well use it 😛

patent hornet Jun 9, 2019, 11:41 AM

#

note: if outposts cannot be created or destroyed

#

your OutpostManager can, for sake of simplicity, just do a single GetAllActorsOfClass, once

#

and cache the result

#

instead of going thru registration

uncut viper Jun 9, 2019, 11:42 AM

#

that's what i have currently in the BT Service that runs on the AI, i cache the result of the GetAllActorsWithTags or OfClass

patent hornet Jun 9, 2019, 11:42 AM

#

but the service runs it every second?

#

or even more frequently?

uncut viper Jun 9, 2019, 11:43 AM

#

for outposts, every 15 +/-5 seconds so 10 to 20 seconds

#

and if it has enough points, it will purchase the outpost, then spawn creeps from it if it has points for them (this is on a 1 second Service)

#

but there is caching of the outposts so not always doing HasTags or OfClass queries

patent hornet Jun 9, 2019, 11:45 AM

#

the BB not supporting array is a problem tho, as any access of UObject also requires a Cast

#

just a little too inelegant for my taste, but it works

uncut viper Jun 9, 2019, 11:46 AM

#

yeah i can imagine, but im dumping that approach in favor of what you said for future needs

#

thanks again @patent hornet i really do appreciate this insight

patent hornet Jun 9, 2019, 11:46 AM

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not sure how i feel about executing world affecting logic from inside a service

#

tho

uncut viper Jun 9, 2019, 11:47 AM

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mmm well it's the AI's job to spawn creeps if the Enemy Player has enough points based on agro and other variables maybe like player health and such

#

i dont see it moved in GM or a Manager

patent hornet Jun 9, 2019, 11:47 AM

#

not that

#

but generally Service grabs the data for the BT, Tasks execute stuff

#

any flow control is obfuscated when you do it like this

#

in a month you'll forget about where that is, and next thing you know, you'll spend 2 hours searching for the code you spawn the creeps from

#

its just a maintainability issue

uncut viper Jun 9, 2019, 11:49 AM

#

hmm

#

i kinda get what you say

#

i have a mix and match of that currently

#

📎 unknown.png

#

the only services that also act as tasks are the top right ones from "Purchase Units"

patent hornet Jun 9, 2019, 11:56 AM

#

generally not everything an AI does has to be in a BT

#

and if its not a decision, it shouldn't be

#

just clutters the thing

#

those services will Tick even if the AI is on low HP and is looking for medpack, right?

uncut viper Jun 9, 2019, 11:58 AM

#

yes, they need to

#

could be moved under the root node as such

patent hornet Jun 9, 2019, 11:58 AM

#

they don't need to be in a BT then

#

as they get executed no matter the environment

uncut viper Jun 9, 2019, 11:59 AM

#

so a better place would be on the char BP itself ?

patent hornet Jun 9, 2019, 11:59 AM

#

or its AIController

uncut viper Jun 9, 2019, 11:59 AM

#

aha

patent hornet Jun 9, 2019, 12:00 PM

#

or an ActorComponent on either

uncut viper Jun 9, 2019, 12:00 PM

#

i see

patent hornet Jun 9, 2019, 12:01 PM

#

this is still readable, because its small, but doesn't scale well

#

most common approach is to encapsulate the related logic in a component

#

like StrategicActions component, that runs all the stuff AI does with its owned "assets" on the map

uncut viper Jun 9, 2019, 12:03 PM

#

aha

patent hornet Jun 9, 2019, 12:04 PM

#

you still don't need it, but unless you add a code where AI needs to decide what to do with those assets based on the environment, you don't need to run it in a BT

#

infact, BTs do quite poorly juggling two unrelated sets of logic at the same time

uncut viper Jun 9, 2019, 12:06 PM

#

understood, will keep the already made svc files but moved them in the AiCtrler for now and will test to make sure nothing broke but they were pretty self contained not using anything from the BT or BB

lyric flint Jun 9, 2019, 4:35 PM

#

Pls can someone give me a good tutorial for npc attacking player and taking damage to player Pls

#

?

pine steeple Jun 9, 2019, 4:45 PM

#

that seems really simple, do you really need a tutorial? your AI hits the player, sends a takedamage event to the hit actor, hit actor reduces his health?

uncut viper Jun 9, 2019, 4:46 PM

#

https://www.youtube.com/playlist?list=PL4G2bSPE_8ukuajpXPlAE47Yez7EAyKMu

YouTube

AI - YouTube

#

have a look here

lyric flint Jun 9, 2019, 4:48 PM

#

the ai doesnt hit the player, it did taht before but not anymore... and my head is starting to hurt

#

i got a behaviour tree, when the player is in range, he does the attack. The task is really simple "Event execute ai + cast to Brain_ai + get custom event attack+ a delay for the movement attack+ finish execute"

#

the custom event goes to the npc (and i know that is more simple to just, instead of casting to brain_ai and then get the custom event, just make a cast to npc and then get the custom event) then he executes the animation

#

but he doesnt

pine steeple Jun 9, 2019, 5:04 PM

#

and you checked Gameplay Debugger?

#

checked the state of the BT when he is supposed to attack?

#

put a breakpoint to see if said code actually executes?

lyric flint Jun 9, 2019, 5:05 PM

#

ye, i found the error. Thank you for the help. I had event execute, instead of event execute ai. oof 🙃

pine steeple Jun 9, 2019, 5:06 PM

#

yeah debugging is the best thing to do

#

and its one of the most useful things you can do when you have a problem

lyric flint Jun 9, 2019, 10:34 PM

#

Hi, Im trying to make a tile floor that when his collision gets overlaped he jumps and stops in air, and goes in the direction of the player. Whats the best way to do it? Fly?

pine steeple Jun 9, 2019, 10:35 PM

#

sure

#

i wouild use a navlink and pass it to the ai

pine yew Jun 10, 2019, 7:46 AM

#

Hey everyone. Any chance someone would be kind and teach me some AI Basics. I have had a read, and watched some tutorials, but I can't get stuff done. Like, for example, getting diferent actors from the same parent class to act diferently if they are all using the same AI

lyric flint Jun 10, 2019, 10:25 AM

#

Hi, so im making a boss. This boss as 5 parts, and when one part dies another gets agro. It only misses on thing on the blueprint but i dont know what to put.

#

📎 unknown.png

#

what should i put as object?

#

its an npc

wary ivy Jun 10, 2019, 10:39 AM

#

what are you trying to do?

#

do you know what "cast to" means?

#

but to answer your question: you plug in an instance of Desert Boss Left Leg there

patent hornet Jun 10, 2019, 10:45 AM

#

@pine yew the simplest way to achieve that is to use a RunBehaviorTree task for custom logic

#

and just have your derived classes define their own asset

#

so they share the same common logic, but can run entirely different BT when they need to attack or move/run/crawl/fly to something...

pine yew Jun 10, 2019, 11:08 AM

#

Well, my problem is like this: Imagine a SIM City game, where you have a bunch of people. There are tasks that need to be done, and the player can either assign a NPC to a task, or the NPC will do that task by himself, based on some parameters.
Now, if I was to create a AI controller for each NPC, it would be a lot of AI controllers. ANd this might be the way I will have to do it, but I hope not.
At the moment, I have only 1 AI controller, but the problem is, when I call that AI and change the BT, it actually changes the BT For all the other AI, or, for some reason, just for one of them, the first one to have been spawned * this might be a mistake of mine somewhere, I need to investigate more)

lyric flint Jun 10, 2019, 11:41 AM

#

@wary ivy sorry for the reply time. Im trying to make, that when the Desert Boss Left Leg, health goes to 0, these part can start using the behaviour tree. But i found an alternative, im just going to use a custom event, instead of event begin play

pine steeple Jun 10, 2019, 12:23 PM

#

@pine yew the only way you could possibly use one ai controller for multiple npc's is to create an array of BrainComponents

#

and assign each new NPC a new BrainComponent

#

that it can use

pine yew Jun 10, 2019, 12:25 PM

#

Cool, thanks!

patent hornet Jun 10, 2019, 2:46 PM

#

you might look into a solution where instead of your subclasses of pawns encapsulating behavior

#

the object that needs the task performed on it holding the logic for how it should be done

#

you have a bed? bed has a BT in it that defines how to use it. when your pawn interacts with it, it runs that beds BT

#

approach has a lot of advantages, like being able to significantly extend AI behaviour without ever touching the binaries

fallow hound Jun 10, 2019, 11:25 PM

#

Yeah the Sims uses that method

fallow hound Jun 11, 2019, 1:11 AM

#

Do Gameplay tasks replace pawnactions?

wary ivy Jun 11, 2019, 4:44 PM

#

yes as far as I know

lyric flint Jun 11, 2019, 5:59 PM

#

how do i make that when i throw a ball, when that ball hits something it disapears?

#

like a wall, floor, enemies, etc

sudden ledge Jun 11, 2019, 7:33 PM

#

hello there. i'm trying to make a tower defence game. i am using default ai components (navmesh etc) of unreal engine. is there a way to predict where the agent will be in the next 1 second so that an enemy arrow can hit it from above?

fallow hound Jun 11, 2019, 8:22 PM

#

@sudden ledge https://api.unrealengine.com/INT/BlueprintAPI/AI/Perception/RequestPawnPredictionEvent/index.html

Request Pawn Prediction Event

#

I've never used, so I can't help much beyond this link

sudden ledge Jun 11, 2019, 8:28 PM

#

hmm, i guess this won't work for curved roads, right? thanks though, i'll look into it 😃

wraith eagle Jun 11, 2019, 10:22 PM

#

Finally taking a look at Behaviour Tree stuffs and doing a BTService in C++. Is TickNode the correct tick function to use? Cause it doesn't seem to be calling. I'm assuming I'm missing something dumb...

#

Oh, got it. Was deriving from BlueprintBase, not BlackboardBase

tropic lily Jun 12, 2019, 11:23 PM

#

I know this sounds vague, but does anyone have any idea how to make an AI walk circles around a player?

patent hornet Jun 12, 2019, 11:51 PM

#

make an EQS point grid around the player

#

filter anything too close or too far for a single query

#

filter unreachable

#

filter too close and too far from the player

#

score the rest, move to winner point

#

so you want points on grid around the player that are not too close or too far from the player (donut), that are not too close or too far from the AI (otherwise it might just decide to walk thru the player to get on opposite end of the circle)

#

you filter out anything not on navmesh, and otherwise illegal as well

#

and it will, depending on the frequency on the query and your definition of "not too close and not too far from AI" do fine or rough circles

#

@tropic lily

tropic lily Jun 13, 2019, 12:11 AM

#

Wow, I didn’t think it was that simple lol

#

Thank you

tropic lily Jun 13, 2019, 1:14 AM

#

Wait how do I make sure it’s always around the player? (It’s been a while since I worked with EQS)

patent hornet Jun 13, 2019, 1:53 AM

#

i'd know if i looked, but it has to do with EQS context cursor

bronze carbon Jun 13, 2019, 10:05 AM

#

Hi, Is there good way to change the parameter of task in behavior tree? e.g. "Acceptable Radius" on "MoveTo" task. This radius may vary according to setting/buff.
One way I know is use Blackboard to store the radius key, and implement a task similar "MoveTo", the only difference is float radius property replaced with BlackboardKeySelector. But it's tooooo heavy😫
Is there any other easier way? Thanks!

📎 unknown.png

woeful parcel Jun 13, 2019, 12:25 PM

#

hello AI enthusiasts. I am looking into making my own little AI in UE4 but I see that the learning resources pinned by @elfin socket are all for blueprints. do you happen to have a learning resource for building a C++ AI that you could recommend? thanks!

pine steeple Jun 13, 2019, 1:46 PM

#

@bronze carbon short of making your own service and checking

#

no

#

how is BlackBoardKeySelector too heavy?

#

that statement makes no sense

bronze carbon Jun 13, 2019, 2:09 PM

#

@pine steeple emm... I think it's too heavy because I have to copy paste the "MoveTo" task, and then change type type of AcceptableRadius from float to KeyboardSelector. If there is many dynamic task parameter (in my game almost all parameters are affected dynamically), all of them must be stored in Blackboard🤔

pine steeple Jun 13, 2019, 2:14 PM

#

set radius to 1

#

and create a service

#

which monitors how close the ai is to the goal

#

using dynamic variable

#

its how i did it

bronze carbon Jun 14, 2019, 2:05 AM

#

@pine steeple Thanks! You saves me!!

lyric flint Jun 14, 2019, 6:21 AM

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Blueprint
I'm trying to get my AI to move around random points in a certain area. I want the area to be square/rectangular, essentially want AI move around the extent of the box.

I can only find a GetRandomReachablePointInRadius node in my Task bp, but this deals with a sphere. Is there a way to achieve this but with a square? Moving around the extent of my navmesh bounds isn't an option unless there's a way to have separate nav meshes overlapping (still new to AI so not sure how I would go about that), cause there's a certain area I want the AI to be able to go to after the behaviors are done.

lyric flint Jun 14, 2019, 6:48 AM

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Nevermind I was overthinking it. I set up a box trigger and then made a reference to it. Then got its bounds and used the Random Point in Bounding Box node for the location

woeful parcel Jun 14, 2019, 8:36 AM

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anybody has problems seeing blackboard keys in their behaviour tree?

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📎 unknown.png

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📎 unknown.png

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although I do have them on my bottom right

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📎 unknown.png

woeful parcel Jun 14, 2019, 8:56 AM

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if anybody has this issue: I had to change the base class of the blackboard key to Actor

pine steeple Jun 14, 2019, 12:19 PM

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yeah

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default object wont show up

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glad you found it 😃

woeful parcel Jun 14, 2019, 1:12 PM

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trying to hook a vehiclecomponent's movement component to the AI is a pain!

pine steeple Jun 14, 2019, 3:21 PM

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its not really possible

pine steeple Jun 14, 2019, 3:38 PM

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with default implementation 😄

woeful parcel Jun 14, 2019, 7:34 PM

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I've built my own UPathFollowingComponent

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and it seems to be working

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my problem is that the target location determined by the pathing system is not taking into consideration the width of the vehicle 😦

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📎 Start.gif

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anybody has any idea?

jaunty peak Jun 14, 2019, 8:12 PM

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You could use EQS to find valid points?

woeful parcel Jun 14, 2019, 8:14 PM

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hm yeah good point

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first of all I think I should learn about the AI system in UE

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for example I've no idea what a nav data is, what filter class is

jaunty peak Jun 14, 2019, 8:17 PM

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If you haven't already seen Ryans tutorials, they are worth looking at, https://www.youtube.com/channel/UCsS5i15vvUbwfr_1JdRKCAA/playlists

YouTube

Ryan Laley

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

woeful parcel Jun 14, 2019, 8:18 PM

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oh I have not

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thank you for that

jaunty peak Jun 14, 2019, 8:18 PM

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😃 you're welcome

woeful parcel Jun 14, 2019, 8:18 PM

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any other learning resource would be welcomed

jaunty peak Jun 14, 2019, 8:32 PM

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Matthews wtf and htf vids are brilliant, underscore and titanic games come to mind as well. Dean Ashford has several as well, it really depends on what you're after. I tend use a couple to get the basics of what I'm looking for and try to seek out more detailed info elsewhere. This discord is great, but can be busy and comments can vanish quickly sometimes. Join the various youtubers discords if they have one, often other users can help out. 😃

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The UE answerhub can be a good aid too, as are the forums.