#gameplay-ai | Unreal Source | Page 100

latent bolt Feb 1, 2018, 8:21 PM

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yeah, there is one

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I'm just looking for a way to make one system to handle movement for characters, not to split it between several plugins..eh..

patent marten Feb 1, 2018, 8:23 PM

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No idea how it works

acoustic tulip Feb 2, 2018, 9:27 AM

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Hi everyone, I've noticed that the AI nav walking sometimes fails because the character is out of the range of valid navigation . FindNavFloor returns false in PhysNavWalking in CharacterMovementComponent, in this situaiton the engine switches the movement mode of AI back to MOVE_Walking (physical walking which doesn't rely on navmesh) but it doesn't seem to swtich it back to nav walking at some point.

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So I wonder if there is a system can switch the movement mode of an AI controllered character between walking and nav walking depending on whether it's on valid navmesh?

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Any ideas about why the nav walking fails would be helpful too, thanks in advance 🙂

wary ivy Feb 2, 2018, 1:34 PM

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@charred glade yeah, a lightweight movement component for navmesh walking AI would be great

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like what Epic did for paragon iirc

charred glade Feb 2, 2018, 1:35 PM

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hmm yeah

static dew Feb 2, 2018, 1:53 PM

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heres a question, i want a respawn delay time on bots and am running into a logic problem. say i have 3 bots. and when they are destroyed it passes a respawn bot request to gamemode. and destroys itself. however because of thedelay, when two requests are sent, since its the same command one gets ignored because the delay. i need some kinda way to have separate requests made

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this is prob more a blueprint prob, i need an asynch task i guess

wary ivy Feb 2, 2018, 1:59 PM

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inside the gamemode you could store the time the request came through

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keep a list of times that represent the request arrival times

static dew Feb 2, 2018, 1:59 PM

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oh god i just got a crazy idea

wary ivy Feb 2, 2018, 2:00 PM

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then each tick check whether the difference between current time and arrival time is greater than the delay you wish

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if so, spawn

lyric flint Feb 2, 2018, 2:02 PM

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Heyo

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I've seen all of Epic's AI tutorials

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yet they don't feel like im able to get realistic AI

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like i want certain AI to just do a full fucking beeline

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when u run up to them lol

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and also some other things

static dew Feb 2, 2018, 2:07 PM

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better save all for sure right now ;P

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this is going to hurt to look at @wary ivy

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📎 2018-02-02_9-08-30.png

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not sure if the macro's will "instance" per each but guess thats my test

wary ivy Feb 2, 2018, 2:09 PM

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why not store the queues in a map and get/set them with the team id

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no need to do a massive switch

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or instead of a map you could have an array of arrays

static dew Feb 2, 2018, 2:10 PM

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well the bots are to balance vs real players which can change

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this is working so far actually

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the respawn time varies as well

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if a ball exists or not

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if it doesnt the condition is likely a round reset meaning spawn .5 delay

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if it exists its durring a around so 7 seconds

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the macro

📎 2018-02-02_9-15-13.png

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maybenot 😄

vagrant pasture Feb 2, 2018, 3:27 PM

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@static dew why not keep the ai controller and have the respawn logic inside it?

static dew Feb 2, 2018, 3:28 PM

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guess i'm not 100% how to spawn the ai controller and then its pawn it will posess, i can spawn a ai character and just have it give itself a controller.. when i destroy the character dont i lose the ai controler?

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though your absolutely right, i'm trying something.

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so far so good 😃

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yes deffinately working

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i wasn't seening the controllers on my outliner

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so i replaced the call to game mode with a call to the controller to unposess and run the routine on the controller to then request game mode respawn it

vast wharf Feb 3, 2018, 12:12 AM

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Hello, I have a question about open world AI... I have a 5km x 5km map and want to use NPC's but baking a navmesh takes a very long time... now, a player pawn actor (me) can walk on this map without a nav-mesh... can I have bots/AI's that don't need a navmesh either, or is a navmesh required for anything but human players?

glossy abyss Feb 3, 2018, 12:14 AM

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what prevents AI from dropping off ledges to chase the player?

vast wharf Feb 3, 2018, 12:14 AM

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the player would have to drop off the ledge first 😉

glossy abyss Feb 3, 2018, 12:14 AM

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thats exactly what I'm doing

vast wharf Feb 3, 2018, 12:15 AM

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the map can be boxed in np.

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I've also briefly tried nav invokers https://answers.unrealengine.com/questions/425015/what-is-the-lightest-way-to-use-navmesh-in-an-open.html but did not get too deep into them, was trying them on the bots that ship with Shooter Game sample, didn't really work. Most of the game logic is in C++

rancid rampart Feb 4, 2018, 3:55 AM

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@vast wharf that's a big "it depends" question. Short answer is very likely Yes. But it depends on the design intent of the ai

lyric flint Feb 4, 2018, 4:34 AM

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https://www.youtube.com/watch?v=6Xw0_QQOAxU&feature=youtu.be

YouTube

Roland Bloom

EQSTestingPawnBugHB

EQS Testing Pawn Bug

▶ Play video

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some reason EQS testing pawn isnt working for me

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just like this guy

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anyone else had this and found a solution?

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it doesnt exist on a empty build

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a fresh build

static dew Feb 4, 2018, 8:13 AM

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I can find the eqs pawn but. No templates and it says depreciated.

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This is an engine build 😦 18.2

sturdy yoke Feb 4, 2018, 7:03 PM

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anybody know a good place to start learning how to do ai with c++?

lyric flint Feb 4, 2018, 7:25 PM

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There is some one who implement blackboard and behavior three in c++
But thats a pain, you have to give a look at ai controller c++, there shoulda be some tutorial atthis point

sturdy yoke Feb 4, 2018, 7:46 PM

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can you not reference the behavior tree in c++?

rancid rampart Feb 5, 2018, 1:14 AM

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You can if you exposure it. The controller should also be holding a ref to it

acoustic tulip Feb 5, 2018, 12:18 PM

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Hi, everyone. I have an AI controlled NPC which is using MOVE_NavWalking on the server but MOVE_Walking on the client. Does this sound correct (because the navmesh only exists on the server side IIRC)? Thanks.

polar copper Feb 6, 2018, 3:51 AM

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Are you not able to add comments in the behavior tree?

vernal thunder Feb 6, 2018, 3:39 PM

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Hey, so I finally finished with one part of my UE4 AI with C++/Blueprints basics tutorials. I really wanted to get some community feedback on how I could make my content better, or just overall how people found it, if they've seen it? Link: https://www.youtube.com/playlist?list=PLRiAzpaeIpPSivZPVLqkr5OfoL8wxy_Xc
Thanks!

YouTube

UE4 AI C++/Blueprints Basics - YouTube

timid arrow Feb 6, 2018, 8:26 PM

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Hi, I am experiencing a very weird situation. When I load up my project in editor and hit play, my AI does not respond at all. I have tried this many times without success. Then I only open the Behaviour Tree asset that is used by my AI pawns (no change was made at any time!), hit play and AI responds as expected. Also does not work in Packaged build. Any ideas what might be the cause of this? Running on 4.18.3

static dew Feb 6, 2018, 10:21 PM

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Dynamic nav mesh, hitting play before t rebuilds?

timid arrow Feb 6, 2018, 10:22 PM

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No navmesh used

static dew Feb 6, 2018, 10:27 PM

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Raises another question. How do they path find?

timid arrow Feb 6, 2018, 10:45 PM

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My AI just moves through air and follows a target. The thing is I can't debug what's going on in the Behaviour Tree because as soon as I open the asset, it works again.

vagrant pasture Feb 6, 2018, 11:07 PM

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check brain component in aicontroller, where are you setting the BT?

timid arrow Feb 6, 2018, 11:10 PM

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On my AIController - Begin play : use BB, run BT

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What about the brain component?

vagrant pasture Feb 6, 2018, 11:12 PM

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check if its set it holds the BT

timid arrow Feb 6, 2018, 11:15 PM

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https://www.dropbox.com/s/77quwln5a8x8rdj/Unreal Engine Demo 07.FEB.2018 - 00.10.53.03.webm?dl=0

Dropbox

Unreal Engine Demo 07.FEB.2018 - 00.10.53.03.webm

Shared with Dropbox

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This video shows what's happening

vagrant pasture Feb 6, 2018, 11:23 PM

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try windows->devtools-> visual logger: start recording before start, maybe there you can see something

timid arrow Feb 6, 2018, 11:33 PM

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Gonna try that, thanks

outer bane Feb 7, 2018, 3:20 PM

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Does anyone know how change the value of a blackboard boolean key from a different actor? I'm really new to all this so assume I know basically nothing. I have ai that travel to the nearest fishing spot. Trying to work out how to make only 1 ai go to each spot.

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here's my ai task for determining closest fishing spot

📎 unknown.png

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and the fishing spot itself

📎 unknown.png

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red line indicates how i tried to set the key

vagrant pasture Feb 7, 2018, 3:25 PM

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the fishing spot has a ai controller?

outer bane Feb 7, 2018, 3:25 PM

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no fishing spot is just an actor

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this is the sort of set up i have

📎 unknown.png

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and the tree

📎 unknown.png

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sorry for image spam, not sure how much info you need

vagrant pasture Feb 7, 2018, 3:27 PM

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than self get aicontroller wont get anything, i would set a bool on the fishing spot and check when finding a spot if its used

outer bane Feb 7, 2018, 3:29 PM

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should i loop through all ai_bp instead?

vagrant pasture Feb 7, 2018, 3:31 PM

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no in the function from your first image, before checking distance, check if the spot is inUse(you need to add that bool), if not in use do your old test and when you are done and have found one set InUse true

timid arrow Feb 7, 2018, 3:32 PM

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Isn't your task for finding closest spot wrong?

vagrant pasture Feb 7, 2018, 3:32 PM

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yeah

outer bane Feb 7, 2018, 3:32 PM

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it seems to be working

vagrant pasture Feb 7, 2018, 3:33 PM

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it takes the first that is closer than 9999999

outer bane Feb 7, 2018, 3:33 PM

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yeah and then loops through all of them and then constantly updates with any that are even closer

timid arrow Feb 7, 2018, 3:34 PM

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you run the loop but finish executing the task on your first element

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You want to move the part with Set blackboard value into the Completed execution branch

outer bane Feb 7, 2018, 3:35 PM

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ohh okay thanks, fixed that now

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I have a boolean for IsSpotTaken

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how do i set that boolean?

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wont that have to be set from the ai task?

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is this how you were suggesting it to be set? @vagrant pasture

📎 unknown.png

timid arrow Feb 7, 2018, 3:41 PM

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That FishingSpot_BP screenshot looks odd too

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so you have an AI actor that finds the closest fishing spot and moves to it, right?

outer bane Feb 7, 2018, 3:42 PM

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yeah

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i just want the ai to check if the spot is already taken

timid arrow Feb 7, 2018, 3:43 PM

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and the FishingSpot_BP does not have AI?

outer bane Feb 7, 2018, 3:44 PM

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no

timid arrow Feb 7, 2018, 3:44 PM

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Ok, then why are you calling Get AI Controller for that actor?

vagrant pasture Feb 7, 2018, 3:44 PM

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📎 lazy.png

outer bane Feb 7, 2018, 3:47 PM

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alright give me a few minutes to digest and undertsand this

vagrant pasture Feb 7, 2018, 3:50 PM

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the hidden and set actor hidden, is the bool InUse you would add to the fishing spot

outer bane Feb 7, 2018, 4:01 PM

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sorry if this is a really dumb question but I cant work out what the target/hidden node is.

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it has an actor/object input and an bool output?

timid arrow Feb 7, 2018, 4:04 PM

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input should be your FishingSpot_BP type

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First set the Actor class to FishingSpot_BP, then create for each node, it will output FishingSpot_BP object

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and then you should drag out your IsSpotTaken bool variable, he was lazy and used Hidden instead

outer bane Feb 7, 2018, 4:29 PM

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where should I be going from here?

📎 unknown.png

vagrant pasture Feb 7, 2018, 4:30 PM

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i forgot to attach the index to the get node at the bottom

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and inside your fishingspot bp add a new boolean variable IsSpotTaken

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and replace hidden with get isSpotTaken and setActorHiddenInGame replace with set isSpotTaken

outer bane Feb 7, 2018, 4:33 PM

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alright will do, thanks

vagrant pasture Feb 7, 2018, 4:36 PM

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and you want to add finish execute to the false path of the if index >=0, but with success false

timid arrow Feb 7, 2018, 4:42 PM

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@vagrant pasture I have sort of tracked down my issue from yesterday. I found out that no service I attach to a Task gets ticked, however basic. Once I open the BT asset again, it receives tick events (Search / Activation events do this too).

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Any ideas what can I do now?

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I wanted to try a clean project, but I am having trouble exporting both my C++ base classes and BP subclasses.

vagrant pasture Feb 7, 2018, 4:44 PM

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no idea there should be no relations between opening the asset and using them

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do you have c++ code that does anything with the BT?

timid arrow Feb 7, 2018, 4:46 PM

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My c++ is just a custom movement component and a pawn that uses it, then I subclass those in blueprints. Doesn't do anything with AI

vagrant pasture Feb 7, 2018, 4:49 PM

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would try to copy BT,Task.. to new project and try using it with a new pawn

outer bane Feb 7, 2018, 4:57 PM

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thanks for the continued help, is this what you had in mind (i added prints to help me understand what's going on)

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📎 unknown.png

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adding the IsSpotTaken branch into the fishingspot_bp

vagrant pasture Feb 7, 2018, 5:00 PM

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IsSpotTaken probably doesnt need replicated but doesnt matter

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directly above the get node is NearestIndex, no need to run a connection directly from where you set it

outer bane Feb 7, 2018, 5:03 PM

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Oh yeah true. fixed that nearest index thing

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this is looking correct then?

📎 unknown.png

vagrant pasture Feb 7, 2018, 5:05 PM

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and most importantly you want to set IsSpotTaken to true when the branch is true and dont change it when it is false that only means you didnt find any fishing spots, so you tell the AI to do something else by finishing excute with no success

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and i noticed now, IsSpotTaken needs to be part of the fishing spot BP

outer bane Feb 7, 2018, 5:09 PM

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So in the fishing spot bp do i need to set IsSpotTaken to true if an actor is overlapping?

vagrant pasture Feb 7, 2018, 5:10 PM

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you set that to true when ai selects a spot to go to and set it back to false when ai stops using it

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if the player can block a spot, you could set it to used when player starts fishing and either not allow the player to fish when ai is on its way there or abort the AI and let it search for somewhere else

outer bane Feb 7, 2018, 5:13 PM

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that makes sense yeah, i was thinking about travel time causing an issue with what i had in mind

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the ai still all go to the same spot i'm probably missing something stuff in the FishingSpot_bp

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📎 unknown.png

vagrant pasture Feb 7, 2018, 5:22 PM

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that code will likely do nothing. only if in the first 12-14 somebody is in the overlap it will spawn fish

outer bane Feb 7, 2018, 5:26 PM

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it's working fine from what i can see

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i set the timer for ai before then go off to their task to 15-25 seconds and they all ran to the nearest spot and fish spawned with random intervals

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or do you mean if there's more than 14 AI's?

vagrant pasture Feb 7, 2018, 5:29 PM

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ah wait that runs endless, yeah

outer bane Feb 7, 2018, 5:29 PM

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oh alright cool

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still cant work out how to stop them going to same spot though

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📎 unknown.png

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also yes, i'm using lamps instead of fish

vagrant pasture Feb 7, 2018, 5:31 PM

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can you show current version of you task again?

outer bane Feb 7, 2018, 5:32 PM

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📎 unknown.png

timid arrow Feb 7, 2018, 5:33 PM

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Maybe you don't want the variable IsSpotTaken to be local for that function, you want to create it on FishingSpot

vagrant pasture Feb 7, 2018, 5:37 PM

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yeah, drag of the Array element pin in the for loop and type getIsSpotTaken and use that for the branch and than drag of the Get node and type setisspottaken and replace the other set IsSpotTaken

outer bane Feb 7, 2018, 5:42 PM

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like this?

📎 unknown.png

timid arrow Feb 7, 2018, 5:43 PM

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Yeah but you forgot to plug the execution from Branch to that Set node

outer bane Feb 7, 2018, 5:44 PM

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oh yeah! thanks

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they still go to the same spot 😦

vagrant pasture Feb 7, 2018, 5:46 PM

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you dont set it to true

outer bane Feb 7, 2018, 5:47 PM

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sorry?

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oh wait i think i got you

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omg i think it works

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Thanks man, I appreciate it. It's such a headache wrapping my mind around all this but i'm making progress in my understanding. I'll go over the hraphs some more to glean as much understanding as i can

buoyant geyser Feb 7, 2018, 9:48 PM

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hey does anyone know if hierarchical task network (HTN) are coming to the engine anytime soon? I think I've read somewhere that they are but can't find anymore...

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*it

dusky lodge Feb 7, 2018, 9:51 PM

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I think Miesko (cant spell his name) was working on an experimental HTN plugin

vagrant pasture Feb 7, 2018, 9:57 PM

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MieszkoZ

dusky lodge Feb 7, 2018, 10:01 PM

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Ty 😃

buoyant geyser Feb 10, 2018, 7:58 AM

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if I have multiple SimpleParallel nodes running at the same time, do they execute on the same (extra) thread, or do each get their own thread execution context?

vocal sinew Feb 10, 2018, 9:28 PM

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Hey guys, is it possible to make noise from ActorComponent?

half vessel Feb 10, 2018, 11:28 PM

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Anyone here that has been messing around with Clientside navigation ? Any lessons learnd ? My project is a peer to peer multiplayer with some AI features. It runs right now with replicated movement on the Tank ai that i have. Do i save myself alot of network load by doing Clientside navigation and setting replicated movement to false ?

static dew Feb 11, 2018, 10:13 AM

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Anyone got thoughts on ways to navigate bots around moving objects. Updating the navmesh dynamically with obstacle doesn’t seem to work well.

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This clip shows points around a ball the colored bot is trying to get to in order to be in a better defensive or shooting position. Sometimes they don’t avoid the call as you’ll see in the end 😃

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https://clips.twitch.tv/EphemeralGoldenGrassPanicVis

Twitch

UltraballGame Playing Unreal Engine Demo - Twitch Clips

Bad Bots Trying to score. - Clipped by UltraballGame

▶ Play video

errant phoenix Feb 11, 2018, 10:54 AM

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asked in the wrong chat earlier, but hey! Is there anyone that has an experience with traffic simulator?

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Got a car moving on splines, randomly choosing which are allowed, but how do i define for example if a car wants to get from start to end through splines? Tried to search how i can define pathfinding

dusky lodge Feb 11, 2018, 11:22 AM

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@errant phoenix You could try defining the path as if it was part of an “Graph Traversal”

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Google it and see how it might apply to what you need.

errant phoenix Feb 11, 2018, 11:25 AM

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alot of non-related stuff to ue4 to read, but it depends on "Point" based navigation finding the shortest path trough the points as i understood?

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not non-related but yeha

dusky lodge Feb 11, 2018, 11:29 AM

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Basically i was getting at that your Spline points could be represented as part of an graph. Then finding an path on an graph in 2d space is much easier and thus you should be able to translate that directly to an path of spline points which may not be necessarily be apart of the same spline.

errant phoenix Feb 11, 2018, 11:40 AM

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Got any links? tried to search this up, finding mostly unanswered answerhub threads haha

burnt wolf Feb 11, 2018, 7:54 PM

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Anyone ever had issues with AI not wanting to follow nav links?

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I followed this and have interactable doors set up with nav links but AI ignores them

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https://www.vikram.codes/blog/ai/02-nav-modifiers-links

Vikram Codes

Navigation Modifiers and Links in UE4

Learn how to use advanced features of the UE4 Navigation system, including how to make an AI jump off cliffs, and also make use Launchpads to make your AI jump back up!

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If I manually place nav link proxies by hand it works

buoyant geyser Feb 11, 2018, 9:07 PM

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when an observer aborts the underlying node tree, does it abort tasks in the middle of execution, i.e. in the middle of a function, or does it wait for the running ExecuteTask() to complete?

worn crescent Feb 12, 2018, 5:46 AM

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So I am having trouble with dynamic navmeshes and using world composition.

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specifically when I call moveto it fails because it can't find the nearest navigatable point

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I checked the "full rebuild on first load" checkbox as well

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hmm it would appear this has something to do with the size of the world I believe...

worn crescent Feb 12, 2018, 8:10 AM

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@night hazel have you dealt with world composition and dynamic navmeshes?

night hazel Feb 12, 2018, 8:11 AM

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nope

worn crescent Feb 12, 2018, 8:11 AM

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sadface

night hazel Feb 12, 2018, 8:11 AM

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but the kite demo has it

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i think

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they are dynamically generated in the kite demo

worn crescent Feb 12, 2018, 8:11 AM

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ah okay I will look at that

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thank you 😄

pale current Feb 12, 2018, 10:17 AM

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following this tutorial series (https://www.youtube.com/watch?v=eND5XlHvX0o) but getting errors like this

YouTube

Unreal Engine

Blueprint MOBA Minion/Creep AI: The Basics | 01 | Live Training | Unreal Engine

Announce Post: https://forums.unrealengine.com/showthread.php?109449 In this Live Training Stream, Ian and Alexander talk about what we'll need to create MOB...

▶ Play video

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📎 unknown.png

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which links back to this

📎 unknown.png

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no idea what exactly is going wrong, but my minions will spawn, but will not move to any waypoint (given the error that makes sense) but cant tell whats wrong in the blueprint, getting some sleep- thanks anyone!

vagrant pasture Feb 12, 2018, 10:42 AM

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@pale current you clear your waypoint count and than resize it to 2, but you try to access lane 3(index2) also when you use increment you dont need to set it again

static dew Feb 12, 2018, 11:57 AM

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anyone know how to make sure when an ai spawns it doenst immediately start using any cached up movement information? i have rounds in my game and some reason after each round when the bots respawn and posess a new pawn they take a few steps in directions when they shouldnt

vagrant pasture Feb 12, 2018, 12:00 PM

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you reuse ai controller?

static dew Feb 12, 2018, 12:00 PM

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yeah

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they unpossess and a new pawn is spawns and they get pushed into it

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tried stop movement in pawn when it unpossesses no change

vagrant pasture Feb 12, 2018, 12:02 PM

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you can stop ai logic

static dew Feb 12, 2018, 12:02 PM

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hmm wonder if its the blackboard/behavior tree still running the move routine

vagrant pasture Feb 12, 2018, 12:02 PM

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and make sure that you reset the blackboard keys

static dew Feb 12, 2018, 12:05 PM

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giving this a whirl

vagrant pasture Feb 12, 2018, 12:05 PM

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getbrain component-> stop/restart logic

static dew Feb 12, 2018, 12:05 PM

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yup

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since movetolocation was still set it was valid and it continue with the logic on spawn

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thanks 😄

buoyant geyser Feb 12, 2018, 12:29 PM

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service nodes in behavior trees may have random deviation specified for their tick interval. is it per BT instance of per BT? say I have 5 AI controllers all using the same BT: do each of the units get their own, randomized intervals or does it just randomize once and apply that number to each?

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I'd guess that the goal of random deviation is so that service execution is staggered, i.e. my 5 units won't all be executing the same service at a similar point in time, correct?

outer bane Feb 12, 2018, 6:15 PM

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Hey guys. I'm running into an ai issue where if i spawn an ai it changes the variable for multiple actors. Basically I have fishing spots that the ai are supposed to travel to and this works really nicely when i manually place ai before pressing play. but when i spawn by standing on a button, the ai behave differently

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basically the way the ai works is that it finds the nearest available fishing spot, checks if it is already taken, if not it will mark the spot as taken and move to it. Issue is, that when the ai sets the spot as taken, it also changes the variable for all other fishing spots

vagrant pasture Feb 12, 2018, 6:27 PM

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how are you setting it?

outer bane Feb 12, 2018, 6:30 PM

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the way you showed me last week 😛

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Thanks for that, really appreciate the help

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i'll get a screenshot now

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📎 unknown.png

vagrant pasture Feb 12, 2018, 6:35 PM

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check if that task runs more than once for one ai and make sure that the ai resets the spot if it takes a different

outer bane Feb 12, 2018, 6:40 PM

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hmm i added a wait node before the find fishingspot task and i think it solved the issue

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very strange. will make 100% it's solved now

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seems like it...

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literally spent an hour trying to fix aha

pale current Feb 13, 2018, 9:29 AM

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I've gotten my actor to recognize its waypoint assignment, but it stops at the first waypoint despite having more in the list...is this a behavior tree problem most likely?

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📎 unknown.png

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considering if its maybe nav mesh...? maybe ill just sleep on it and try again tomorrow lol

acoustic tulip Feb 13, 2018, 11:42 AM

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Hi everyone, I need to pick a random point in radius (2000) but I don't want the point in radius (500).
So is it possible that I pick a point between radius 500-2000?

outer bane Feb 13, 2018, 11:45 AM

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do a random range between 0-1500 then add 500? 😛

acoustic tulip Feb 13, 2018, 11:47 AM

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Hmm..that might work. I can pick a random direction and multiply it by a random range between 0-1500 then add 500 🙂 . I'll give it a go. Thanks.

outer bane Feb 13, 2018, 11:49 AM

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just get the actor location, break vector, add a random float range to each axis, then add 500, set that as the target location

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you just make a blackboard vector variable, set that in the task we just created, then use a walk to in the tree and walk to the target we set

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Let me know if you get that working and i'll post my question. (having trouble with spawned objects not behaving the same as when i place then manually)

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@acoustic tulip oh wait i got it wrong, give me a sec

acoustic tulip Feb 13, 2018, 11:57 AM

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Thanks a lot @outer bane since all my logic is in C++ so I will probably try to implement it in C++. I think the idea should be good and I just need to make it fit my situation. You can post your question though. 🙂

outer bane Feb 13, 2018, 12:07 PM

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📎 unknown.png

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@acoustic tulip i think this should be it

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(i know you said not to worry but I wanted something like this too)

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basically checking if the direction they are moving is positive or negative and then either adding or subtracting 500 accordingly

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Alright to onto my issue. I have fish that spawn when ai stand on a fishing spot. I've made it so that the player can pick up these fish when they walk over them.

📎 unknown.png

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then ion the player i have this

📎 unknown.png

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everything works perfectly when i manually place the fish, but when i spawn the fish using the fishing spot, the fish dont work

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this is the fishing spot

📎 unknown.png

proven elm Feb 13, 2018, 12:54 PM

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are you using BT?

outer bane Feb 13, 2018, 12:55 PM

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I'm using behavior trees for the ai movement only

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the actual spawning happens in the flishingspot_BP

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📎 unknown.png

proven elm Feb 13, 2018, 12:56 PM

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mh

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then i cant help

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i dont use bt

outer bane Feb 13, 2018, 12:57 PM

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i dont think it's an issue with bt

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the fish spawn using a blueprint

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and the player is supposed to pick up fish

proven elm Feb 13, 2018, 12:58 PM

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"the fish dont work" isnt very precise

outer bane Feb 13, 2018, 12:58 PM

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i have BP showing the entire BP for the fish

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if you scroll back a bit i included all BP screenshots

proven elm Feb 13, 2018, 12:59 PM

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what is not working

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i dont get what is not working

outer bane Feb 13, 2018, 1:00 PM

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basically the fish are set up to be destroyed when player overlaps

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this works great when i place them manually before hitting play

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but when i spawn the fish (actor/object?) using the fishing spot BP they stop being able to detect the actoroverlapevent

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from what i can see

proven elm Feb 13, 2018, 1:02 PM

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you should add a print to the false side of the branch

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print out anything you wish

outer bane Feb 13, 2018, 1:05 PM

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hmm it's printing a bunch of times

proven elm Feb 13, 2018, 1:06 PM

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means what

outer bane Feb 13, 2018, 1:06 PM

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sorry?

vagrant pasture Feb 13, 2018, 1:06 PM

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do you want the player or ai to pick them up?

outer bane Feb 13, 2018, 1:07 PM

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player

proven elm Feb 13, 2018, 1:07 PM

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if your branch fails

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then your cast has failed

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the player pawn is not the one overlapping

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i ask myself why you even did that math

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equal player pawn

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unusual

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just cast to the player

outer bane Feb 13, 2018, 1:09 PM

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wait did you want me to add the print here?

📎 unknown.png

proven elm Feb 13, 2018, 1:09 PM

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yee

outer bane Feb 13, 2018, 1:10 PM

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and these are incorrect?

📎 unknown.png

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I'm really new to programming so i just tackle it as i go and do my best to learn and work things out

proven elm Feb 13, 2018, 1:11 PM

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woa that is creepy

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youre doing overlaps inside the player

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dont do that

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dont

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that entire code there could be in one actor

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and that one has a collision sphere

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from wich you get on component overlap

outer bane Feb 13, 2018, 1:12 PM

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where should i keep track of many fish the player has picked up then?

proven elm Feb 13, 2018, 1:12 PM

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in the player ofc

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but youre not doing overlaps inside the player

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the fish has the entire code

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not the player

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at least this case demands it

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you want to overlap fish

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not check if player has overlapped

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the difference is the perspective

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the player is constently overlapping lots of stuff

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its to global

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the fish can detect alone, is enough

outer bane Feb 13, 2018, 1:16 PM

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So inside the player I should check if fish overlaps, then destroy fish, and add to the counter?

proven elm Feb 13, 2018, 1:16 PM

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no

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youre already checking inside the player

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thats bad

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the fish checks

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give the fish a collision sphere

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then get oncomponent overlap

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other actor > cast to player BP

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if that all works, add 1 fish. Destroy fish(self)

vagrant pasture Feb 13, 2018, 1:24 PM

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@outer bane

📎 redfish.png

outer bane Feb 13, 2018, 1:29 PM

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Ahh okay. I just read up on casting some more and understand it a little better I believe. So when it adds to the Red Rishcounter that is happening in the RedFish_BP, how do you tie that variable to the player?

vagrant pasture Feb 13, 2018, 1:37 PM

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that variable is from the player, you could also write a function on the player that handles adding fish since it would give you more control to add other side effects

outer bane Feb 13, 2018, 1:37 PM

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Also when i place the red fish now i can destroy actor by walking over to it, but when it's spawned using the fishing spot i can no longer destroy it

proven elm Feb 13, 2018, 1:37 PM

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that ++ node actually works?

vagrant pasture Feb 13, 2018, 1:38 PM

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it uses reference to increment

proven elm Feb 13, 2018, 1:38 PM

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i always have a bad feeling using it

vagrant pasture Feb 13, 2018, 1:39 PM

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well i would normally have a function on player that does the actual logic, but use increment there too, its only a macro adding 1 and setting the var

outer bane Feb 13, 2018, 1:42 PM

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alright awesome, I have that set up. Still an issue with spawned actor not being able to be destroyed when player overlaps trigger

vagrant pasture Feb 13, 2018, 1:43 PM

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did you change collision settings in anyway in the placed actor?

outer bane Feb 13, 2018, 1:44 PM

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I dont think so, just dragged and dropped it into viewport

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actual BP actor looks like this

📎 unknown.png

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the table is a red fish aha

vagrant pasture Feb 13, 2018, 2:07 PM

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are you standing inside the overlap when it spawns?

outer bane Feb 13, 2018, 2:20 PM

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@vagrant pasture no, i stepped way back

vagrant pasture Feb 13, 2018, 2:24 PM

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try comparing the collision settings of both to make sure that nothing is changed

outer bane Feb 13, 2018, 2:25 PM

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in the details panel in the main window?

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📎 unknown.png

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this is the one i placed

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this is one spawned

📎 unknown.png

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i cant see any changes other than the listing order of the items inside the fish BP

vagrant pasture Feb 13, 2018, 2:28 PM

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click on the sphere component and look for collision

outer bane Feb 13, 2018, 2:30 PM

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can't see any differences

📎 unknown.png

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📎 unknown.png

static dew Feb 13, 2018, 2:35 PM

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Making logic for an ai to intercept a moving ball is quite interesting

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It’s like... I think I need to dot the actors to get a vague idea of coming or going. Then get its predicted location. And add or subtract the base movement speed of the bot hmm

vagrant pasture Feb 13, 2018, 2:39 PM

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@outer bane i see your problem look at the blue collision of your "fish" its larger than the overlap so you cant touch it, you need to make the colision sphere larger

outer bane Feb 13, 2018, 2:42 PM

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but the blue collision isn't what we're using for the overlap detection? @vagrant pasture

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oh wait if i scale it up to 1000 it works

vagrant pasture Feb 13, 2018, 2:44 PM

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its a blocking collision you run against it and never got to the sphere

outer bane Feb 13, 2018, 2:44 PM

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so the fish is being spawned with incorrect sphere size?

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or either that the sphere doesn't move with the fish?

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and stays up in the air

vagrant pasture Feb 13, 2018, 2:46 PM

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yeah make sure to always have overlaps larger than the object

outer bane Feb 13, 2018, 2:47 PM

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i just let liek 10 spawn and then were positioned apart from each other, when i got within a certain range then all vanished in one go

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i think the sphere collision isn't in the right place

vagrant pasture Feb 13, 2018, 2:48 PM

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didnt you scale it by 1k?

outer bane Feb 13, 2018, 2:48 PM

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yeah

vagrant pasture Feb 13, 2018, 2:50 PM

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fix the setup first, set the scale to 1 and set the radius until its 10% larger than the object

outer bane Feb 13, 2018, 2:50 PM

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oh sorry have scale set 1 and the radius at 1000

vagrant pasture Feb 13, 2018, 2:51 PM

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than make sure that radius is only 10% larger

outer bane Feb 13, 2018, 2:51 PM

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how do you know what's 10% larger

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how's this

📎 unknown.png

vagrant pasture Feb 13, 2018, 2:51 PM

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by feel, around 10%

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thats ok

outer bane Feb 13, 2018, 2:58 PM

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should it be working? It doesnt :/

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📎 unknown.png

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weirdly things look different between spawned and manually placed versions

vagrant pasture Feb 13, 2018, 3:01 PM

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where does the blue box come from? and when you take the spawned object now and place it does it work?

outer bane Feb 13, 2018, 3:02 PM

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i just enabled bounds which lets me see the sphere collision

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no moving the spawned objects does nothing. when i say manually i mean by dragging from the content browser

vagrant pasture Feb 13, 2018, 3:04 PM

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meant adding a new one, in viewport switch from lit to player collision(near the bottom)

outer bane Feb 13, 2018, 3:06 PM

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i was right!

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📎 unknown.png

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the collision sphere is floating up there

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it doesnt fall with the fish

vagrant pasture Feb 13, 2018, 3:10 PM

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is your sphere attached to the fish?

outer bane Feb 13, 2018, 3:11 PM

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it is now

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which just solved the issue

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before it was attached to the scene root

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thanks man for the help, really appreciate it

ruby ravine Feb 13, 2018, 5:47 PM

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How to make one AI chase another AI (On seen) ?

I suppose we need mesh reference of the other AI , but how to get it in first AI's blueprint graph?

kind wigeon Feb 14, 2018, 12:41 AM

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When are BT decorators evaluated? For instance, if a decorator's condition becomes true, it evaluates the subtree. What happens if the condition becomes false? What triggers the decorator to check?

acoustic tulip Feb 14, 2018, 1:15 PM

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https://docs.unrealengine.com/latest/INT/Engine/AI/BehaviorTrees/NodeReference/Decorators/

Behavior Tree Node Reference: Decorators

Reference for the Behavior Tree Decorator nodes.

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@kind wigeon Maybe this helpful?

kind wigeon Feb 14, 2018, 4:16 PM

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@acoustic tulip Thanks, but I've read that page several times already and it doesn't seem to have the answer.

static dew Feb 14, 2018, 9:28 PM

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It goes in order of the numbers on the tree working it’s way down left to right when it fails it moves to the next. And it’s failure type is determined by a drop down on the decorator

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Fail self etc

vagrant pasture Feb 14, 2018, 9:30 PM

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i think he wants to know if the decorator gets notify on change of the variable it observes or if it checks in some interval

static dew Feb 14, 2018, 9:32 PM

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Ah

pale current Feb 14, 2018, 11:04 PM

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So I've gotten team0 to recognize their proper assigned waypoints and they progress in the proper order using a waypoint array. I thought doing a 'reverse' loop would allow me to use the same array, and just run it in reverse for team1. It's still assigning the waypoints in the same order as team0. Suggestions on how to have the order run in reverse for team1? thanks 😃

📎 unknown.png

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I debated just making seperate waypoints entirely and repeating this process, but I feel thats a lot of extra tasks unnecessarily being done

vagrant pasture Feb 14, 2018, 11:29 PM

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you get the waypoint number from the waypoint which will be the same even if you reverse the loop, you could add them reverse by subtracting it from last index and than setting it with the result, but why not use 1 array for each lane and have team 1 pick the waypoints in reverse when they pick them

pale current Feb 14, 2018, 11:53 PM

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hmm yaeh i tried subtracting but that kept going wrong somewhere as well

fallow gull Feb 15, 2018, 10:36 AM

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Hi guys, who is created first when I launch the game, the pawn or the controller?

neat summit Feb 15, 2018, 8:54 PM

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@fallow gull If you are spawning everything from the GameMode (as in "not placing the pawn directly into the map"), the Controller is created and then the Pawn.

fallow gull Feb 15, 2018, 8:55 PM

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@neat summit okay. and the inverse if I place the pawn directly into the map right?

neat summit Feb 15, 2018, 8:56 PM

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yes

fallow gull Feb 15, 2018, 8:56 PM

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Okay cool, thanks

neat summit Feb 15, 2018, 8:56 PM

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np! 😃

fallow gull Feb 15, 2018, 10:40 PM

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I have a question about EQS, how could I trace from an actor set? In other words, from multiple actors?
I have some hiding spots that are actors in the world, and I want to trace from every enemies to check if they see any of the hiding spot actors or not. If they do, the score is null, or filtered.
I can only get one enemy tracing

neat summit Feb 15, 2018, 10:48 PM

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@fallow gull you have to create an EQS Context (either using C++ or Blueprint). It has a method called "ProvideActorsSet" where you can return all the actors you want. The trace test will use this and score/filter accordingly

fallow gull Feb 16, 2018, 12:47 AM

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I forgot to say thanks, It worked. Let me explain what I did, because I'm not sure I get everything :
The main query was supposed to search for all the hidding spots in the maps. Although I was using a single actor method as the context on the main qurey (that was my error).
Then I had a visibility trace test that was supposed to trace from each enemies and check if they see the hiding spots or not. I used a context that provides an actor set on this test.
The wierd thing (And I still don't understand why) is that I would find all my hidding spots even though the context on the query was set to provide a single actor. And the trace test would trace from only one enemy even though the context was set to provide actor set. Normally, shouldn't it be the inverse?

serene pelican Feb 16, 2018, 10:30 AM

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How does AI Controller actually move the pawn?It looks like it uses "Add Movement Input".
Is there a possibility to incercept/customize the behaviour?

static dew Feb 16, 2018, 10:59 AM

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What would you modify in it?

fallow gull Feb 16, 2018, 11:37 AM

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Hello guys, How that is supposed to work?
Do the trace fires from my enemy to my actors of class ''BP_HidingSpot''
Or do the trace fires from my enemy to my querier?
Or even something else? My results are quite strange...

📎 unknown.png

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this is what I get :

📎 EQS01.gif

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My enemies are circled in red

serene pelican Feb 16, 2018, 7:02 PM

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@static dew Well, AI Characters always move in straight lines. A more organic movement would be neat.

static dew Feb 16, 2018, 7:03 PM

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Like strafe dodging?

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I am too interested in ai that goes a to b but. It so straight. If it was a texture I’d be let’s allow a noise texture to be fed in to randomly provide left and right deviations but still go straight 😉

patent hornet Feb 16, 2018, 7:17 PM

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you can chop it in smaller querries

quick anchor Feb 16, 2018, 7:18 PM

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Hi peeps! I barely did any AI in UE4 at all, and after a huge break, I need to set up some really basic AI logic, however it's not working as I would expect it to do so. I got a basic Tree/BlackBoard, that fires a sequence, like: Start -> Sequence -> Find Random Point -> Move To.

However, it's always giving me 0,0,0 for the point, and the AI is not moving. Tried Random Navigable and Random Reachable, and I just can't get it to work.

patent hornet Feb 16, 2018, 7:18 PM

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got a navmesh?

quick anchor Feb 16, 2018, 7:18 PM

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Tried hooking up the NavData pin in both, and without them, same issue persists.

#

Ofc

#

Checked a tutorial by Tesla, same code, not working here (4.18.2

desert kelp Feb 16, 2018, 7:22 PM

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MoveTo in behaviour trees not work with FloatingPawnMovement ?

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or maybe my BB value isnt being set...

quick anchor Feb 16, 2018, 7:24 PM

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Here's my incredibly complicated code. Char location printed properly, random point prints 0-0-0 and no movement happens.

📎 aicode.png

patent hornet Feb 16, 2018, 7:41 PM

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i think you need that NavData pin connected

static dew Feb 16, 2018, 8:01 PM

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Event received ai input

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Will give you controller pawn

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Oh duh I see it

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You have an actor casting to a player controller

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That cast is probably failing @quick anchor

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And a player controller doesn’t exist in the world so it’d prob return 0 if it was working

quick anchor Feb 16, 2018, 8:19 PM

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The prints are working, it wouldn't even print if the cast failed

fallow gull Feb 16, 2018, 9:31 PM

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can I make a character not being affected by Nav Area Costs?

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Or by a specific Nav Area?

ruby sinew Feb 17, 2018, 4:21 PM

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Hey guys, I have this problem where MoveTo starts failing and it won't take any MoveTo inputs. AI just stands still and refuses to move anywhere. Any idea of a workaround? Engine version is 4.15.3.

paper onyx Feb 17, 2018, 8:20 PM

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@ruby sinew are you sure you've created navmesh for your level?

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MoveTo wont work without it

ruby sinew Feb 17, 2018, 8:41 PM

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There is a navmesh, and it works fine for a couple of minutes. Until one of the actors starts failing its MoveTo.

valid spruce Feb 17, 2018, 11:04 PM

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Hello! I am facing an issue with the function MoveTo. I wrote a detailed post (project included) on the answerhub in December but didn't get any answer yet 😅 . Could someone give me some help? 😊 https://answers.unrealengine.com/questions/734472/move-to-bug-when-toogle-collision.html

vast wharf Feb 18, 2018, 1:37 AM

#

Hello, anyone here have experience with Quixel Megascans?

valid spruce Feb 18, 2018, 2:42 PM

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Hello again! Could you please give me upvotes on my answerhub post 🤗 ? (see my yesterday message)

pastel nimbus Feb 18, 2018, 6:03 PM

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Hello people. I am facing this issue when using EQS and moveTo : https://answers.unrealengine.com/questions/759917/move-to-not-working-when-passes-through-dead-playe.html

outer bane Feb 19, 2018, 5:00 PM

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any idea why the blackboard key isn;t being set? https://i.gyazo.com/7058346c3a8a8e085b2e67d5009ab120.mp4

▶ Play video

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https://media.discordapp.net/attachments/221798862938046464/415190288492134429/unknown.png?width=1628&height=937

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nvm, was using wrong set value node :l

buoyant geyser Feb 19, 2018, 11:00 PM

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is there a way to block a task from executing with a blackboard based condition, but at the same time return success as a result?

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I know about the force success node, but I think it only forces success if the underlying task has failed (not another observer)

patent hornet Feb 19, 2018, 11:23 PM

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you can put it in a Selector with a decorator that prevents exec and ForceSuccess after it

foggy moth Feb 21, 2018, 12:41 PM

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Question - i got a AI problem with some physics i'm doing in a project ..... I have a "fan" that applies a force from it - pushing whatever objects come into its "BLOW" path away from it. I have AI Bots that when theyre on a pathfinding goal, and cross into this fan.... become "Confused" and when blown.... try to get back to the spot they were blown from before progressing forward with their goal.

I can easily pickup when the bots enter into this "FAN" area.... but i'm not finding a way to RECALCULATE their goal... or what i would expect to see is a Nagivation/Pathing ForceUpdate function. Does such functionality exist?

outer bane Feb 21, 2018, 6:38 PM

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Hey I'm running into some issues with 'the move to' task. I have a tree i want them to move to and have a vector key storing the location but the location is at the center of the tree. I think this causes the task to fail as the ai cant get to the center of the tree due to collisions. I've tried adjusting the acceptable radius but this doesnt solve the issue unfortunately

#

📎 unknown.png

stray juniper Feb 21, 2018, 6:44 PM

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Try setting the target location to a reachable location

#

📎 unknown.png

outer bane Feb 21, 2018, 6:49 PM

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oh that worked like a charm! Thanks!

stray juniper Feb 21, 2018, 6:49 PM

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I'm in the stream lol

#

It's in your profile

#

1 sec

#

@outer bane Debug points

📎 unknown.png

#

I have a custom Environmental Query built for my AI to determine illumination, how could i use the same query system data to determine the illumination of my Player?

kind wigeon Feb 22, 2018, 6:28 PM

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Is it possible to have non-conditional decorators? For instance, I want to trigger an event when a BT node deactivates.

vagrant pasture Feb 22, 2018, 7:04 PM

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@kind wigeon whats about receive execute finish?

kind wigeon Feb 22, 2018, 7:06 PM

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@vagrant pasture What does that do?

vagrant pasture Feb 22, 2018, 7:07 PM

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gets called when the decorator finish's with a reason

kind wigeon Feb 22, 2018, 7:09 PM

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Great, thanks.

pallid ledge Feb 22, 2018, 7:26 PM

#

Anyone got some spare time and want to help? I am really getting desperate now... AI doen't want to do what it should

pallid ledge Feb 22, 2018, 7:45 PM

#

From the left into the branch comes the result of the linetrace, true = player in sight, false = no direct LOS. Somehow the AI always instantly falls back to idle, despite there being a memory marker

📎 unknown.png

patent hornet Feb 23, 2018, 6:03 AM

#

do you ever clear your MemoryMarker?

#

because if you do not, all those MemoryMarker == NULL checks will always return false

gray barn Feb 23, 2018, 5:46 PM

#

need some AI tutorials of nice quality

#

Please DM if you know some

lyric flint Feb 24, 2018, 1:35 AM

#

How can I make my AI

#

walk around dynamically placed structures

#

and foliage

#

they just get stuck...

#

and cant path around it

patent hornet Feb 24, 2018, 2:03 AM

#

if its walking around, you can probably use a NavModifier or Blocking Volume

#

make that part of NavMesh not exist for them

tardy wolf Feb 24, 2018, 5:03 AM

#

Hey guys, I'm working on Blackboards/Behaviour Trees for the first time... can someone tell me how I can trigger a task only once when a key is changed?

gray barn Feb 24, 2018, 9:15 AM

#

Hi! I need some nice AI tutorials. Please DM me them if you know some.

lyric flint Feb 24, 2018, 4:20 PM

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@patent hornet wouldnt work

#

im using navigation invokers

sinful zealot Feb 25, 2018, 10:30 AM

#

hi guys is there a reason why i cant use the "LocationToGo" key to my Blackboard key??

📎 unknown.png

tardy wolf Feb 26, 2018, 1:02 PM

#

Judging from the colour, it looks like its type Object. How are you using the key in the task? Normally "go to" functions are down with vectors.

wild elk Feb 26, 2018, 5:01 PM

#

Hi guys I have a problem with the AI not playing its walking animation, it is playing the Idle animation so the Anim BP is working. Maybe it is not reading its speed as to why it's not moving? Can someone tell me where to check? Here is my Anim BP graph setup:

📎 unknown.png

static dew Feb 27, 2018, 10:07 AM

#

Anyone got some thoughts why my bots don't want to move when i travel from one level to the next?

#

like the behavior tree is running but they don't do there thing

patent hornet Feb 27, 2018, 12:48 PM

#

open VisualLogger

#

record the incident, and check what are your bots actually doing

inner crane Feb 28, 2018, 12:04 AM

#

@sinful zealot i have the same exact issue

#

hi so im having an issue exactly the same as kemp that i cant figure out to solve and that is my MoveTo isnt accepting my LocationToGoKey

patent hornet Feb 28, 2018, 12:12 AM

#

@inner crane do you know what is the exact reason for failure?

inner crane Feb 28, 2018, 12:13 AM

#

exact reason no because i have no errors but it seems to me that its not pointing to it all but i dont quite understand it. Im kinda new to ai and programming with it.

patent hornet Feb 28, 2018, 12:13 AM

#

go to windows>developertools>visuallogger

#

start recording, and then play the scanerio where it fails to move

#

visual logger will present you in detail what each AIController is doing

inner crane Feb 28, 2018, 12:15 AM

#

well this is the issue i know that

📎 asd.PNG

#

i guess it doesnt see my blackboard?

patent hornet Feb 28, 2018, 12:16 AM

#

that can fail for alot of reasons

#

SelectControlPoint fails, you didn't add a navmesh, location isn't reachable to name a few

#

that is why visual logger, so you know what you need to fix instead of stabbing at it in the dark

inner crane Feb 28, 2018, 12:17 AM

#

it doesnt show any vars

📎 ads.PNG

#

i cant find the visual logger

patent hornet Feb 28, 2018, 12:18 AM

#

your SelectControlPoint should fill a blackboard key

#

and your moveto should access it, it should not be None

inner crane Feb 28, 2018, 12:19 AM

#

im pretty sure i did set it too. would you like to see the code for any issues?

#

i mean knowing me

#

i probably messed up one line

patent hornet Feb 28, 2018, 12:19 AM

#

https://docs.unrealengine.com/latest/INT/Gameplay/Tools/VisualLogger/

Visual Logger

Tool that captures state from actors and then displays it visually in game or editor.

inner crane Feb 28, 2018, 12:20 AM

#

alright got it

#

what do i need to do with it

patent hornet Feb 28, 2018, 12:23 AM

#

you start recording

#

it will list all the AIControllers that are active

#

and it will draw boxes in the graph whenever they try to do something

#

when you select one of those, you can see its state, its pawn's state and any feedback from its actions

#

at the time of execution

inner crane Feb 28, 2018, 12:24 AM

#

LogVisual (Log) Redirected 'PathFollowingComponent' to 'AIController_0'
LogVisual (Log) Redirected 'ActionsComp' to 'AIController_0'
LogVisual (Log) Redirected 'BP_aiPatrol_2' to 'AIController_0'
LogVisual (Log) Redirected 'GameplayTasksComponent' to 'AIController_0'
``` this is all i got

patent hornet Feb 28, 2018, 12:25 AM

#

that happens at the very start i take it?

#

what happens when you give it a MoveTo command?

inner crane Feb 28, 2018, 12:26 AM

#

how do i do that

patent hornet Feb 28, 2018, 12:29 AM

#

when tree executes as the game goes on

#

it should draw more boxes in the graph

#

you select one further in and see what happens when your BTree runs

inner crane Feb 28, 2018, 12:34 AM

#

it didnt draw anything

patent hornet Feb 28, 2018, 12:35 AM

#

in that case i'd wager your BTree doesn't even run

inner crane Feb 28, 2018, 12:38 AM

#

probably not

#

would you like to see me source files?

patent hornet Feb 28, 2018, 12:47 AM

#

im going to sleep in a couple of minutes

inner crane Feb 28, 2018, 12:51 AM

#

alright

#

Alright so now my issue is it wont allow me to select locationtogo

#

📎 anim.PNG

viscid oasis Feb 28, 2018, 4:23 AM

#

Do people do AI with CPP or just via the editor ?

dusky lodge Feb 28, 2018, 4:26 AM

#

Yes AI can be done in C++

viscid oasis Feb 28, 2018, 4:27 AM

#

Good idea? bad idea?

#

If it's like BP, I'd prefer to do them in CPP

dusky lodge Feb 28, 2018, 4:27 AM

#

Blackboard is just like BP

viscid oasis Feb 28, 2018, 4:27 AM

#

I'm guessing CPP AI is more performant too?

dusky lodge Feb 28, 2018, 4:27 AM

#

Yes

#

You have more control as well

earnest stratus Feb 28, 2018, 4:28 AM

#

ai perception

viscid oasis Feb 28, 2018, 4:29 AM

#

ai perception?

ocean crystal Feb 28, 2018, 5:18 AM

#

Some mixture of C++ and BP/Editor, as always, is the best

#

But yeah you can make/use most everything in C++

viscid oasis Feb 28, 2018, 5:26 AM

#

Not to be a prick, but that's an incredibly non-answer answer.

#

But that's probably because my question was overly broad.

ocean crystal Feb 28, 2018, 5:39 AM

#

¯_(ツ)_/¯

willow arch Feb 28, 2018, 11:15 AM

#

ive a map with a blocking gate in it, which i enable/disable based on certain conditions

#

the ai is refusing to move through it when its disabled

#

am i gonna have to manually recalculate the nav volume when i enable/disable it? or could there be something else im missing?

#

its a bit odd, because they do move all the way up to the gate, then kind of hit an invisible wall

snow night Feb 28, 2018, 2:16 PM

#

So, I can see it has been asked 1000 times in here, but I find no answer
How do I make my AI jump up to another Navlink?
I can make him drop down just fine, but... not jumping up

keen furnace Feb 28, 2018, 2:46 PM

#

@snow night because not many people worked out how, or are willing to share! I'm busy now but message me later I'll explain how

snow night Feb 28, 2018, 2:47 PM

#

@keen furnace Thanks!

keen furnace Feb 28, 2018, 2:48 PM

#

np

valid spruce Feb 28, 2018, 2:49 PM

#

Hello! I am facing an issue with the function MoveTo. I wrote a detailed post (project included) on the answerhub in December but didn't get any answer yet 😅 . Could someone give me some help? 😊 https://answers.unrealengine.com/questions/734472/move-to-bug-when-toogle-collision.html

#

(at least upvotes ^^)

patent hornet Mar 1, 2018, 7:51 AM

#

you could put a decrator around the MoveTo function that checks if the destination is reachable and aborts if its not

acoustic tulip Mar 1, 2018, 2:27 PM

#

Hi everyone, can I ask if anyone has experience using FindPathToLocationSynchronously to decide whether a location is reachable for an AI taking the NavQueryFilter into consideration also?

inner crane Mar 1, 2018, 11:21 PM

#

how would i set my ai to go back to path if lost actor

acoustic tulip Mar 2, 2018, 9:13 AM

#

Set a homelocation and tell the AI to return to it if the actor is not valid

inner crane Mar 2, 2018, 4:53 PM

#

in the code or behavior tree

inner crane Mar 2, 2018, 7:45 PM

#

what is the best way to have the ai to check if it can still see player and if it is close enough to attack without a homelocation and just continue on its path. also keep in mind im in c++

hot basalt Mar 3, 2018, 8:23 PM

#

is there a way to limit the angular speed of an AI character? ive done basic movement and it turns instantly around corners

patent hornet Mar 3, 2018, 8:26 PM

#

i think that is the movement component's job

snow night Mar 3, 2018, 11:44 PM

#

Hi. I have this behavior tree setup

#

📎 unknown.png

#

It's causing me some problems

#

The first two on the left work fine. But once angerlevel goes over 600, they stop standing up and just follow the player

#

eventhough they are supposed to stand up before they can start moving

#

Any ideas what I've done wrong?

viscid oasis Mar 4, 2018, 8:02 AM

#

Tall order here but anyone have the logic handy to make a pawn, that's using the character animation that comes with third person, rotate when moving?

lyric flint Mar 4, 2018, 8:07 AM

#

ehat is AI from?

#

what*

dusky lodge Mar 4, 2018, 8:28 AM

#

AI is Artificial Intelligence. Discussion about anything that can be described as non player

lyric flint Mar 4, 2018, 9:01 AM

#

non player???what is this?what player

#

can you describe it?

dusky lodge Mar 4, 2018, 9:34 AM

#

https://en.wikipedia.org/wiki/Artificial_intelligence_(video_games)

Artificial intelligence (video games)

In video games, artificial intelligence is used to generate responsive, adaptive or intelligent behaviors primarily in non-player characters (NPCs), similar to human-like intelligence. The techniques used typically draw upon existing methods from...

potent minnow Mar 5, 2018, 2:21 AM

#

Is there a tutorial, or an online class or a book or an instructor, that can teach me BTs and EQS?

lyric flint Mar 5, 2018, 7:30 AM

#

what is ai from?

valid spruce Mar 5, 2018, 9:53 AM

#

@DCorvinos#1829 you can take a look at this one, it's an official unreal live training

bright sand Mar 5, 2018, 10:26 PM

#

Noticing an inability to let my AIcontroller control my BOTcharacters yaw inputs.

#

However letting my AI drive my Add Movement Input on the Movement Component works just fine.

peak ibex Mar 5, 2018, 11:48 PM

#

is there a way to make a decorator with 'observer aborts' update immediately? I notice sometimes the behavior tree will execute another task before the decorator further up is re-evaluated

#

so sometimes an extra task happens that shouldn't, after the conditions for aborting happen

peak ibex Mar 6, 2018, 12:22 AM

#

I see blackboard values cause immediate update, so I guess the answer is to push all data through the blackboard

#

so much boilerplate setting/getting though, and having duplicate data around is error prone

#

it's a shame you can't tag properties in the actor to automatically be in the blackboard or something

valid spruce Mar 6, 2018, 1:21 PM

#

@potent minnow https://youtu.be/NZZtMNdJk5o

YouTube

Unreal Engine

Setting Up Advanced AI | Live Training | Unreal Engine

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

▶ Play video

buoyant geyser Mar 6, 2018, 6:47 PM

#

is there a way to have a MoveTo BT task run in the background, i.e. return immediately?

#

I'm guessing I could make do with a SimpleParallel node w/ the left branch being the moveto, right branch everything else, but doesn't MoveTo somehow support this by default?

exotic dove Mar 6, 2018, 8:02 PM

#

Is there any lovely person that can help me? Is there any way a can fix the navmesh build, to fit better? Or are my world scaling off?

📎 Problem.JPG

patent hornet Mar 6, 2018, 9:02 PM

#

you have anything invisible protruding from those walls?

fluid sequoia Mar 6, 2018, 9:13 PM

#

Anyone familiar with AAIController->FindPathForMoveRequest ? I'm not sure how to format a MoveRequest or Query member

exotic dove Mar 6, 2018, 9:31 PM

#

@patent hornet No nothing. The yellow lines is the navmesh tile bounds. There are only static meshes in the level, and the collision sems correct. . . Any idea?

fluid sequoia Mar 6, 2018, 9:59 PM

#

@exotic dove regarding small navmesh bounds you can adjust your navmesh agent size to fit up closer to the sides of walls. It can also be a result of the entire world itself not being large enough, you can try scaling literally everything by some factor

#

Also I was really lazy and didn't even inspect the agent radius lol

#

Yes I would try scaling the world by a factor of 8 and see if it doesn't improve

exotic dove Mar 6, 2018, 10:09 PM

#

@fluid sequoia That was my fear. 😦 Theres a lot to change in my characters in that case. ha ... damn. A appreciate the help tho. Thanks a ton.

fluid sequoia Mar 6, 2018, 10:11 PM

#

@exotic dove tell me if scaling everything actually fixes it whenever you give it a try

exotic dove Mar 6, 2018, 10:24 PM

#

@fluid sequoia I will try. My fear is that to mutch must be rebuilt. Already started thinking on ways to go around it. .. **** me.

fluid sequoia Mar 6, 2018, 10:27 PM

#

I faintly remember there may be a way to adjust the world scale amount as an engine variable but I'd need to look into it

exotic dove Mar 6, 2018, 10:41 PM

#

@fluid sequoia I tryed loking in the documentation for quik bit, but i didet find anything obvious. Sounds like a awsome feature tho.
You are controlling a Mouse in the game. So i started building everything way to smal... foolish of me. haha

lyric flint Mar 7, 2018, 2:13 AM

#

i'm using tensorflow to make a chat bot ai
i have a code with these lines

import numpy as np
import tensorflow as tf
import re
import time
tf.__version__
lines = open('movie_lines.txt', encoding='utf-8', errors='ignore').read().split('\n')
conv_lines = open('movie_conversations.txt', encoding='utf-8', errors='ignore').read().split('\n')```
but when i try to debug it via vscode (code runner) it says that it can't import numpy and tensorflow..
and when i try to run it via live code runner (https://cloud.backend.ai/) it says that it can't find 'movie_lines.txt' and 'movie_conversation.txt'

#

please help

fluid sequoia Mar 7, 2018, 2:24 AM

#

@lyric flint I would assume the errors you get trying to run it through (https://cloud.backend.ai/) is because that remote site doesn't have access to the local files 'movie_lines.txt' and 'movie_conversation.txt'. In regards to failure to import, make sure the files you want to include are arranged in the folder hierarchy correctly

#

Also including that web link puts a switch button under my message in discord which I can't interact with... which is cool

lyric flint Mar 7, 2018, 2:32 AM

#

oh i'm sorry

#

as far as i know i can't seem to upload my local files to the cloud
so i guess the only solution is to make vs code able to import tensorflow

#

i'm installing Anaconda right now

dire anchor Mar 7, 2018, 8:32 AM

#

@viscid oasis It is done in Template project. They just rotate the Pawn to the Controller's Yaw rotation every frame.

viscid oasis Mar 7, 2018, 11:09 AM

#

hmm?

serene pelican Mar 7, 2018, 2:01 PM

#

Can I extend AI to use more MovementModes than Walk,Swim and Falling/Flying?

#

like Climbing Ladders, Climbing Ledges (implemented via different Movement Mode. NOT flying)

potent minnow Mar 7, 2018, 5:39 PM

#

hey anyone knows how can I see the vision cone when using AI Perception?

fluid sequoia Mar 7, 2018, 7:17 PM

#

Hey all, I'm having a problem with getting back the NavPath from pathfinding request. I prototyped a function here that my character uses to tell the AI controller to move it. I have a working implementation using MoveToLocation but now I'm using FindPathForMoveRequest to get the NavPath separately.

#

Here is the current implementaiton

#

void ADungeonCrawlerCharacter::NavigateToLocation(FVector TargetLocation)
{
    CharacterAIMoveRequest.SetGoalLocation(TargetLocation);

    ((AAIController*)GetController())->BuildPathfindingQuery(CharacterAIMoveRequest, CharacterPathFindingQuery);

    ((AAIController*)GetController())->FindPathForMoveRequest(
        CharacterAIMoveRequest,
        CharacterPathFindingQuery,
        CharacterNavPathSharedPtr);

    ((AAIController*)GetController())->GetPathFollowingComponent()->RequestMove(FAIMoveRequest(), CharacterNavPathSharedPtr);
    //CharacterPath.Get()->GetPathPoints() Will operate on path points here to draw visual of path
        
}```

#

Also yes a proper implementation should just get the controller when my character is created but I was roughing it out

#

ANYWAY the pressing issue is that this code works but only once, anyone have any clue why?

fluid sequoia Mar 7, 2018, 7:39 PM

#

Addendum, checking path points that I receive on the second attempt to call pathfinding, I only get the start and end location which are the character's current location

#

OK, solved the problem.

#

As it turns out, you should modify the FAIMoveRequest goal location by using UpdateGoalLocation function rather than SetGoalLocation. I assume this is because updating the goal location is setting some metadata in FAIMoveRequest to repath so when the query is made through BuildPathFindingQuery it knows to use the new value... or something like that lol

#

In any case if anyone is interested in getting NavPath node locations from their pathfinding request then this is a good way to handle it, it seems.

fluid sequoia Mar 7, 2018, 8:34 PM

#

OK new question, anyone familiar with rapidly modifying a path target location rarely causing the character that's following the path to get stuck stuttering on a node? Not entirely sure what the cause is

fluid sequoia Mar 7, 2018, 8:58 PM

#

Another question, is there any helper function for making navpaths?

elfin socket Mar 8, 2018, 6:11 AM

#

I wish I could find more implementations of AI in games to look at as examples. There have been a few AI example livestreams but they seem to me to be too rambling and verbose to be useful.

#

I know of one video in particular where a guy throws a ball and has his dog return it to you then go back to running and hiding, but that's the only kind of thing I've found like that.

fluid sequoia Mar 8, 2018, 7:20 PM

#

Anyone familiar with efficient function for checking whether navigation node is valid, recast nav mesh has GetRandompointInNavigableRadius which returns a bool whether it can find a point but I can't seem to find a function that merely checks whether a point lies on navmesh

neat summit Mar 8, 2018, 7:26 PM

#

@fluid sequoia UNavigationSystem has something like that. Namely "ProjectPointToNavigation", which checks if a specific point can be project to the NavMesh

fluid sequoia Mar 8, 2018, 7:29 PM

#

Thanks @neat summit , I have an implementation using GetRandomPointInNavigableRadius that seems performant but was looking for a better solution, I will see whether this is better suited

potent minnow Mar 8, 2018, 9:11 PM

#

anyone knows of a reason why a simple "move to" fails?
it goes to the target, the problem is not that it can't find its target
it just goes there, waits a few seconds and then fails
last night it was working perfectly, I don't know what happened

#

and now, I changed the target variable into another type, didn't change the code at all (except for when i reference the old variable) and it works

#

Is Unreal AI bugged or something?

#

should i stop using BTs?

midnight jackal Mar 8, 2018, 11:53 PM

#

Hi all. Does anyone know if you can feed in the PlayerController to an AI Blackboard and use that with AI sensing to track the player? Im having an issue now where the AI lose sight of the player character when they enter a vehicle. Or perhaps any other suggestions on getting the AI to keep sight of the player character when they enter a vehicle. Thanks!

desert kelp Mar 9, 2018, 1:44 AM

#

How far away from the player can I spawn an AI and it still make its way to the player?

#

how far before the engine says its too far and stops running its BT?

soft atlas Mar 12, 2018, 2:25 AM

#

how would you go about creating enemy boat ai for a pirate game? shis should chose to broadside, ram, mortar or flee and attack ships or idle

wary ivy Mar 12, 2018, 2:11 PM

#

that's a really broad question

desert kelp Mar 12, 2018, 6:13 PM

#

@wary ivy *that's a real broadside of a question

#

More specific question: I know how to make a behaviour tree, and get it working with one AI character, and one AI controller. What about multiple enemy types?

#

Do I create a seperate AI controller, character, behaviour tree and blackboard for each enemy type?

#

or is it better to re-use the same assets and just have variables to define if an enemy can do a thing?

#

Like with my weapon class, I use a data table to define different weapons, and I can use it to have anything from a single shot pistol, to a full-auto rifle, to a pump shotgun on the same weapon BP

wary ivy Mar 12, 2018, 6:30 PM

#

I'd have same kind of AI try to use the same controller class

#

but with different behaviour tree

#

like all humans would use the same controller class

desert kelp Mar 12, 2018, 9:35 PM

#

ok, so far my AI controllers are just this: https://docs.unrealengine.com/portals/0/images/Engine/AI/BehaviorTrees/QuickStart/6/fullEG.png\

#

a simple use blackboard, set a variable and run behaviour tree.

#

so would I get the blackboard and behaviour tree to use off the character?

#

afaik, I spawn the enemy character class (the actor), which would then create an instance of the AI controller for it

#

Just found some tutorials on spawning waves of enemies that might help me

elfin socket Mar 14, 2018, 8:32 AM

#

Dumb question: Am implementing AI behaviors for a dumb FPS game. Currently struggling with how to design my BehaviorTrees.

Should I re-evaluate blackboard values in one single ServiceNode at the Root?
Should I instead break up behavior into many different ServiceNodes further down the tree?
Should I not even bother with ServiceNodes because they run on every tick and might lag up the game as my AI behaviors scale due to re-evaluating the logic?
Should I instead just assign Blackboard values from the Character's AIController and trust the BehaviorTree's may Decorators to sort everything out?
Should I use an ENUM to determine the behavior state of the current AI? Or should I just use Condition decorators on Blackboard values to determine it dynamically within the BehaviorTree itself?

#

Not sure what the best practices are and I've never seen any tutorial video that shows recommendations. I've seen official UE4 Training Livestreams that take one approach, but then I've seen others that take another approach.

#

For example, in the Advanced AI Official Training Livestream, they take the "Use the AIController exclusively to assign/edit Blackboard values and then use a single ServiceNode at the Root Selector in the BehaviorTree to determine which behavior nodes to run"... but in the Game Ready AI Official Training Livestreams, they took the ENUM approach, if I remember right.

#

In the "Throw a ball and the dog will retrieve it for you" AI EQS demonstration video, the guy in his example took the "Use Service Nodes everywhere to re-evaluate Blackboard keys" approach.

#

... So is this one of those "all of the above are valid and good regardless of scale" situations like so many others in programming? Or is it one of those "do X in Y situation, and Z in W situation" things?

buoyant geyser Mar 14, 2018, 2:54 PM

#

is there an in-depth tutorial on the web explaining the mechanics of how Decorators work?

#

I am checking the source code but sometimes I see comments like // highly inefficient, but hopefully people will use it only for prototyping. in the engine source that I'm very glad to stumble upon but ultimately freak me out a little - UE4 AI veterans must know these by heart

woeful wren Mar 14, 2018, 3:16 PM

#

Is there anyone one that could point me in the direction to setting up a good flocking ai controller. I need all the characters in the flock to have collision. Essentially I want free roaming ai that will run from player characters, but they need to stay grouped and not scatter..... : /

buoyant geyser Mar 14, 2018, 3:27 PM

#

@woeful wren check this out: https://youtu.be/lFpXqggbUP4?list=LLR4A_B5-BjWRpwN_pggvqVg&t=4412

YouTube

Unreal Engine

Pawn Movement Techniques | Live Training | Unreal Engine

Announce Post: https://forums.unrealengine.com/showthread.php?124316 CORRECTION: Alex and Ian said this is the "Strategy Game" but it is "Turn Based Strategy...

▶ Play video

#

flocking behavior that also follows the player, great for hoards of zombies

#

w/ some minor tweaks you can probably make them run away from the player vs. running towards it

woeful wren Mar 14, 2018, 3:34 PM

#

yes @buoyant geyser you the man

buoyant geyser Mar 14, 2018, 5:24 PM

#

artificial intelligence

patent hornet Mar 14, 2018, 5:26 PM

#

i smell a troll

#

that asked the same question last week

#

very funny, haha 😦

buoyant geyser Mar 14, 2018, 5:32 PM

#

with a name like crusher? a troll? how I not see a connection!... :)

#

@patent hornet since you're here, I might as well ask: are you aware of any in-depth tutorials covering Decorator nodes in particular?

latent bolt Mar 14, 2018, 7:12 PM

#

@elfin socket it's hard to find any best practices for ue4 AI. Do not forget that you can setup tick rate for the service nodes, which will reduce cpu load

#

@elfin socket also, as I think it's best to avoid stacking service nodes at root node.

patent hornet Mar 14, 2018, 7:14 PM

#

@buoyant geyser was just going home from work, but no, i don't know of any

latent bolt Mar 14, 2018, 7:15 PM

#

and enum for state machines is the best option. You can make general enum and some optional enums for more details (to use them down in tree).

delicate sparrow Mar 15, 2018, 2:57 AM

#

Question: Attempt to make an AI attack where the character moves at a fast speed ( using char movement property) and applies damage and force to any players hit. How do I go about this?

elfin socket Mar 15, 2018, 3:41 AM

#

@delicate sparrow imo You need to break that down into a bunch of smaller tasks and smaller questions because in order to answer that we'd have to write an entire essay

delicate sparrow Mar 15, 2018, 3:42 AM

#

Okay. Umm How would I do collision check during an AI Move to so I can do damage?

elfin socket Mar 15, 2018, 3:43 AM

#

By replacing AI Move with your own function that involves AI Move, and then adding in the collision check stuff (i.e. sphere trace)

delicate sparrow Mar 15, 2018, 10:17 PM

#

Ah. I kinda get it.

civic oriole Mar 15, 2018, 11:40 PM

#

Hey animation and AI people, I have a problem where the root motion of an enemy AI Pawn istn't playing, or at least it appears so. It's an anim montage with root motion where a drone moves back and upwards., but its capsule just stays in place. I already tried an other animation with a simple backward root motion, but it won't move either. The Drone is controlled by a behavior tree. Any ideas why the actor just stays in place?

delicate sparrow Mar 16, 2018, 1:06 AM

#

Question, can I play an Animation graph from AI Behavior Tree?

raw flame Mar 16, 2018, 1:08 AM

#

Good night folks, i've been stuck in a issue here for a while, would really appreciate some help :)

So, my AI was working fine using the nav invoker to move around, then i decided to migrate from my "dev_level" to a persistant world, i put all my weather and time controllers on the persistant level and made an island, but when i tryind to run the game, the AI wouldn't move at all, i've double checked every setting for the invoker navigation system am it's all fine, the only way i got them to work is by having a "spawner" and create them at runtime, and even so, the first spawned AI won't move ...

Any ideas?

Pics:
Editor:
https://i.gyazo.com/cb78d09b727ea3840a3f4c046007048d.png

Runtime:
https://i.gyazo.com/56ea6bdd1825ad28b176621e88949654.png

elfin socket Mar 16, 2018, 1:34 AM

#

.. are... are you using Emojis to convey the AI's current behavior state?

#

That... that's... that's fucking genius. Why didn't I think of that?

patent hornet Mar 16, 2018, 1:37 AM

#

@raw flame singleplayer or multiplayer?

raw flame Mar 16, 2018, 1:37 AM

#

Singleplayer

patent hornet Mar 16, 2018, 1:37 AM

#

streaming levels involved?

raw flame Mar 16, 2018, 1:37 AM

#

Yes

patent hornet Mar 16, 2018, 1:38 AM

#

and if you pre-place AI directly on the persistent level, does it still happen?

raw flame Mar 16, 2018, 1:39 AM

#

yes, the placed AI on the screenshot is on the persistant level

patent hornet Mar 16, 2018, 1:40 AM

#

they have the controller spawned?

raw flame Mar 16, 2018, 1:42 AM

#

Yes

patent hornet Mar 16, 2018, 1:44 AM

#

have you gone thru VisualLogger?

raw flame Mar 16, 2018, 1:45 AM

#

VisualLoger? You mean the debug log?

#

https://i.gyazo.com/5fb1dfaaab549d0f451e049d5d332a3c.png

#

This is the actors list

patent hornet Mar 16, 2018, 1:45 AM

#

no

#

under windows > developer tools

#

you have visual logger

#

it will record what AI controllers and Navigation are doing when its active

raw flame Mar 16, 2018, 1:46 AM

#

ok, will check it, thank you 😃 hope it shows me what is wrong

patent hornet Mar 16, 2018, 1:46 AM

#

then you can examine result of every command, pathfinding query + status of controller/blackboard and pawn

raw flame Mar 16, 2018, 1:57 AM

#

Now not even the spawned ones work, and all the log lines seem normal, the only discrepancy is that all black board tasks are failing since the AI cannot move to them.

patent hornet Mar 16, 2018, 1:58 AM

#

you can examine the blackboard at any "block" with visual logger

#

see if its values were set

raw flame Mar 16, 2018, 2:00 AM

#

They were, the AI got initialized normally, filled the BB and executed the behaviour tree, the perception system is nominal as well, it just won't move

#

no clue why

patent hornet Mar 16, 2018, 2:00 AM

#

you should see any move to results there as well

raw flame Mar 16, 2018, 2:09 AM

#

No moves, it gets the instruction to move, but the next log line is just the task timing out

patent hornet Mar 16, 2018, 2:09 AM

#

but below it will log what happened when it was given the order

#

is the starting point not on navmesh, can it find a path...

#

is the move blocked

#

like you spawned them with their feet in the ground and then its just [Blocked}

#

it will point you in the right direction

#

good luck with this, i'm off to bed

raw flame Mar 16, 2018, 2:13 AM

#

This is all the nav info i got

#

https://gyazo.com/156afdf0030fda8a8c7c4f025e546982

Gyazo

#

yeah i think i'll try to fix this tomorrow, thanks for the help ♥

patent hornet Mar 16, 2018, 2:13 AM

#

select one of the controllers in the top left

#

then click on a teal block in its row

#

and you will get detailed info for that controller

#

at that point in time

raw flame Mar 16, 2018, 2:15 AM

#

Ah, thanks, i'll try to fix this tomorrow morning, wasted 2 days on it already, might as well waste 3 hahaah, thank you a lot for the help, really.

patent hornet Mar 16, 2018, 2:15 AM

#

np & gn

static stratus Mar 16, 2018, 6:37 AM

#

Is there a way to show additional info of the running nodes in behavior tree, like remaining time for "wait node"? I know you can hover over it and it will show you the value (through DescribeRuntimeValues), but I could've sworn it was shown along with description before. Kind of hard to debug when you have several things running 😦 .

dense latch Mar 16, 2018, 2:04 PM

#

Working on some really basic AI for a tank.
https://i.imgur.com/kM9xJFN.png

Imgur

#

If i set this capsule at this location, it'll do what it's supposed to. If i put the capsule inside the tank, it fails to move.

patent hornet Mar 16, 2018, 2:06 PM

#

what does Visual Logger say?

dense latch Mar 16, 2018, 2:07 PM

#

How do I bring that up? Forgive my ignorance aha, this is my first time doing something along these lines.

#

My thought is that the mesh is blocking its vision

patent hornet Mar 16, 2018, 2:09 PM

#

window > developer tools > visual logger

#

start recording, play and select the tank's AI controller

#

it will log any AI command or pathfinding request there, including the reasons for why they failed

#

it will also draw you the current controller's path

dense latch Mar 16, 2018, 2:12 PM

#

https://i.imgur.com/Ddnhx5e.png

Imgur

#

Also under recastnavmesh it says start failed

patent hornet Mar 16, 2018, 2:13 PM

#

i'd imagine that your tank is affecting navigation

#

effectively removing part of navmesh below it

dense latch Mar 16, 2018, 2:14 PM

#

Ah yes that is happening

#

the nav mesh turns red

#

well

#

scratch that

#

its just blank under the tank

#

and the nav mesh is ontop of it

#

https://i.imgur.com/61YGH4a.png

Imgur

patent hornet Mar 16, 2018, 2:16 PM

#

i don't have the editor up, so best i can suggest off the top of my head is uncheck CanAffectNavigation

dense latch Mar 16, 2018, 2:16 PM

#

I disabled can ever affect navigation on the mesh

patent hornet Mar 16, 2018, 2:16 PM

#

or

dense latch Mar 16, 2018, 2:16 PM

#

Yeah that appeared to work

#

😄

patent hornet Mar 16, 2018, 2:16 PM

#

set its NavFilterClass

#

this way one tank will happily path thru another tank

#

collide and get stuck

dense latch Mar 16, 2018, 2:19 PM

#

Yeah I have another issue where when the tanks get to the waypoint, they all get stuck

patent hornet Mar 16, 2018, 2:19 PM

#

i think turning off CanCharacterStepUpTo in collision settings will remove the navmesh from top of the tank, if you care about that

#

visual logger will tell you why they get stuck 😃

dense latch Mar 16, 2018, 2:26 PM

#

Right now they just drive on top of each other instead of getting stuck haha

#

I'll have to disable nav mesh on top of them, but they do go inside of each other, I guess i can fix that with box collision or something

#

For the tanks blocking

#

it says onpathfinished: blocked[blocked]

patent hornet Mar 16, 2018, 2:30 PM

#

that capsule is what your NavAgent for the tank takes as its... bounds

dense latch Mar 16, 2018, 2:30 PM

#

Any reason i can't make the capsule bigger than 88?

patent hornet Mar 16, 2018, 2:31 PM

#

haven't worked on that tho, so can't recommend a good fix

dense latch Mar 16, 2018, 2:33 PM

#

I see

#

Well thanks anyway, you helped me solve my biggest issue 😄

#

I've read for Ai on Ai avoidance you have to add steering or something

radiant zodiac Mar 16, 2018, 6:36 PM

#

guys I used a moba spawning wave bp to spawn my ai characters

#

but once spawn their behavior tree isn't running

#

I'm using event on posses to set the blackboard tree

static stratus Mar 16, 2018, 7:59 PM

#

you sure right controller is set and that it posses pawn on spawn?

#

@radiant zodiac

radiant zodiac Mar 16, 2018, 8:00 PM

#

I fixed it, I had to spawn ai instead of spawning actor

#

thanks

static stratus Mar 16, 2018, 8:00 PM

#

ah I see

idle ibex Mar 17, 2018, 12:36 AM

#

@here I hope this is the right place, I am working on an AI turret that is attached to a ship (so it has to be able to account for different up angles. Right now I have it working with the Look At function but that always aligns it to world Z not to the ship or parent object I needed it to align with. Anyone have any materials resources I can have a peek at to help me understand what I need to do?

raw flame Mar 17, 2018, 3:41 PM

#

Hey folks, i could use some help on level composition and AI navmeshing, i've been stuck on it for some days now.

I posted my issue here https://answers.unrealengine.com/questions/769535/ai-and-light-issue-with-level-composition.html , i't a bit more in depth.

TL DR : Made a level with 2 sub-levels 1 for the day cycle and 1 for all the landscapes, but when i play the game, the AI doesn't move at all, @patent hornet helped me use the visual debuger but the behaviour tree is running perfect, just the move to task is failing, i think it has something to do with the nav mesh but im not sure, i'm using invokers to generate navmeshes at runtime.

fluid sequoia Mar 17, 2018, 4:01 PM

#

@raw flame Have you made sure to set navmesh generation to Dynamic and set Force Rebuild on Runtime?

raw flame Mar 17, 2018, 4:01 PM

#

@fluid sequoia yes for both 😛

#

The only way i can get the AI to move is if i put the terrain in the persistant level.

fluid sequoia Mar 17, 2018, 4:07 PM

#

@raw flame Do your invokers generate navmesh around them when you run the game?

raw flame Mar 17, 2018, 4:07 PM

#

Yes

#

oh you mean at runtime?

#

let me check

fluid sequoia Mar 17, 2018, 4:08 PM

#

Yes at runtime

raw flame Mar 17, 2018, 4:08 PM

#

hmmm

#

not really

#

they are configured properlly though

#

odd

fluid sequoia Mar 17, 2018, 4:09 PM

#

Could you screenshot the odd navmesh at runtime lol

raw flame Mar 17, 2018, 4:10 PM

#

yeah 1 sec, my editor crashed 😛

#

might have broken my project, keeps crashing at initialization, i'll post the ss as soon as i fix this, sorry for the delay 😛

fluid sequoia Mar 17, 2018, 4:14 PM

#

No problem 👍

raw flame Mar 17, 2018, 4:16 PM

#

got it

#

https://i.gyazo.com/9b06e8f0951a8a33f90ddc768b5d7ad7.png

#

im testing 2 AI controllers at the same time just to be safe

#

mine and the engine default

#

Yeah, the lights stoped working agin after the crash https://gyazo.com/39c6c5765b83a80ea502bb6ccfdda940

Gyazo

#

still no vaigation data

fluid sequoia Mar 17, 2018, 4:20 PM

#

weird

raw flame Mar 17, 2018, 4:22 PM

#

Yep, im going mad with this, if i put the terrain on the persistant level it works fine, if i put it in a sub level , it breaks

#

I don't get it, why bother with level composition then?

fluid sequoia Mar 17, 2018, 4:25 PM

#

Uhhh, so for your streaming level, you have set your RecastNavmesh actor to dynamic right

raw flame Mar 17, 2018, 4:26 PM

#

Yes

fluid sequoia Mar 17, 2018, 4:27 PM

#

If you press P when running the game is navmesh being generated?

raw flame Mar 17, 2018, 4:27 PM

#

nope, its just like i showed you in the ss

#

the light stops affecting the terrain and no navmesh is generated

fluid sequoia Mar 17, 2018, 4:28 PM

#

Riiight

raw flame Mar 17, 2018, 4:28 PM

#

let me send you a ss of the structure

#

https://gyazo.com/a9579a26242435ab9c9a402e778def60

Gyazo

fluid sequoia Mar 17, 2018, 4:28 PM

#

lol that naming scheme

raw flame Mar 17, 2018, 4:28 PM

#

https://gyazo.com/2644286f97254ad729b0c3611300cfe4

Gyazo

#

haha i am a little pissed off at the engine right now hahaha

fluid sequoia Mar 17, 2018, 4:29 PM

#

Internet says that you should have a navmesh bound only in your persistent level, which is large enough to encompass the sublevels you stream, so if you haven't tried that, go for it

raw flame Mar 17, 2018, 4:29 PM

#

let me try

#

oh my god

#

it worked hahaha

#

could you send me the link?

#

LOVE YOU ♥

fluid sequoia Mar 17, 2018, 4:33 PM

#

uh...

raw flame Mar 17, 2018, 4:33 PM

#

I was using a method miezko talked about in one of the streams of puting a nav mesh bounds volume in each chunk to be streamed

fluid sequoia Mar 17, 2018, 4:33 PM

#

https://forums.unrealengine.com/development-discussion/content-creation/48489-navmesh-of-sublevel

Navmesh of SubLevel ? - Unreal Engine Forums

Talk about Level Design, Static Meshes, Physics, and more.

#

I just goggled it :P

raw flame Mar 17, 2018, 4:34 PM

#

Yeah i think i suck at googling, i spend 3 days looking articles and tutorials up hahaha

#

thank you so much

#

If you want to post the link as a answer to my ticket i'll gladly karma you up 😃

fluid sequoia Mar 17, 2018, 4:39 PM

#

Sure I'll post an answer

#

posted an answer and realized my account name is different for Epic, need to update it

raw flame Mar 17, 2018, 4:45 PM

#

hahaha thank you, i'll give you some karma, you deserve it 😃

lost tiger Mar 18, 2018, 2:05 AM

#

Hello everyone .. someone knows how to make a melee system

dense harness Mar 18, 2018, 7:04 AM

#

Hey guys. I've been searching this for a good while 👺 I'm hoping someone here can help me out

#

Recently added AI walking to my game and found the cost was pretty high

#

Came across a post on Answerhub about Paragon using a cheaper mode called "navmeshwalking"

#

So I set my characters to use this mode, and yet in AI debug mode they always show to be using the default "walking" mode. I tried forcing "navmeshwalking" by setting it in various ways, like at runtime, and still it never seems to work

#

📎 unknown.png

dapper kayak Mar 18, 2018, 7:41 AM

#

Okay so im working on an Ai that patrols and has postions that it goes to, and i have it to where if it see the player than its moves towards the character, but when it reacts the character it stops and doesnt move. Any idea on why this is doing this, and how to fix?

#

Like a drone lol

ocean crystal Mar 18, 2018, 7:49 AM

#

Alright but like

#

What are you using to issue the move command?

#

What else are you doing?

#

You question is kinda like

dapper kayak Mar 18, 2018, 7:50 AM

#

xD

ocean crystal Mar 18, 2018, 7:50 AM

#

"I have a game that I want to respond to the spacebar, but it doesn't"

#

"Like a jump"

dapper kayak Mar 18, 2018, 7:50 AM

#

lol

#

well then you see that i dont really know to much on what im doing lol

#

But anyways when i go into the pawnsense area, the Ai it follows me, then is just stops and doesnt move again lol

#

📎 asdfad.JPG

#

Idk tbh

#

lol

ocean crystal Mar 18, 2018, 7:52 AM

#

I was about to be sarcastic but you posted an image

dapper kayak Mar 18, 2018, 7:53 AM

#

xD

ocean crystal Mar 18, 2018, 7:54 AM

#

Try going out of the area, far enough away that it can't see you

#

then try coming back so it can see you

dapper kayak Mar 18, 2018, 7:55 AM

#

lol

ocean crystal Mar 18, 2018, 7:55 AM

#

your problem could be that its only running its chase logic once

dapper kayak Mar 18, 2018, 7:56 AM

#

Thats what i was thinking, but in my following Ai, its only set up like this, and it follows you no matter what

#

📎 vzv.JPG

ocean crystal Mar 18, 2018, 7:56 AM

#

Those are practically the same though.

dapper kayak Mar 18, 2018, 7:57 AM

#

Thats what im saying, so idk why it would be pausing and stoping in the other

ocean crystal Mar 18, 2018, 7:57 AM

#

So either your settings on the component are different or SetActorRotation does something weird.

#

Anyway, its been a while since I've done PawnSensing work, but does OnSeePawn fire every frame?

#

I'd have thought it was once-per-start overlap

dapper kayak Mar 18, 2018, 7:59 AM

#

Sorta lol

#

it keeps going off until the casted character or object is out of the sensing area

#

Okay so now its just pausing every so offen

#

Could it just be the squence?

#

Mmmm idk lol

ocean crystal Mar 18, 2018, 8:01 AM

#

Alright, well, you can figure out what's happening if you print out the result enum on either success or fail

#

I doubt it

#

SetActorRotation MAYBE_

#

Look into behavior trees though

#

Its a little more complex but they're much more suited for AI

dapper kayak Mar 18, 2018, 8:02 AM

#

Yeah understandable. I've never used one before

buoyant sphinx Mar 18, 2018, 9:37 AM

#

@dapper kayak you might like this:

#

A lot of you seemed to enjoy the last post - so come and learn a bit about Navigation Filtering and Avoidance whilst making a game of tag!
It took a bit of time - but I think that this new UE4 AI tutorial has come out looking quite spiffy!
https://www.vikram.codes/blog/ai/03-navigation-filtering-and-avoidance

Vikram Codes

Navigation Filtering and Avoidance

Using Unreal Engine 4's Navigation systems to the fullest, we build a fully realised AI vs AI "game of tag". Learn about writing AI, using Unreal Engine, and best practices in your choice of Blueprints or C++.

dapper kayak Mar 18, 2018, 9:48 AM

#

Thnks mate

hybrid grove Mar 18, 2018, 4:16 PM

#

New to AI, have a question - I'm trying to setup a point-click system where I point at the ground and my AI Character moves to that location. My Pawn(with camera), AI Character, AI Controller, Behavior Tree, Blackboard, and BTTask is created and ready to go.
My Pawn is setup and works with a line trace to get the ground location where I click. This is stored in a "ClickLocation" float inside my pawn.
How can I pass this information to my Behavior Tree so my AI Character will move to the click location? I have a variable on my Blackboard called "MoveLocation" but I have no idea how to update ClickLocation to MoveLocation. Assuming this is what I need to do?

patent hornet Mar 18, 2018, 4:27 PM

#

make an input action in project settings > input

#

then pull the input node inside your controller (it will have the input action's name)

#

and update blackboard there

dense harness Mar 18, 2018, 5:23 PM

#

Just gonna post my issue again for the day-time crowd 😬 Would really appreciate anyone weighing in on this issue

#

https://answers.unrealengine.com/questions/769740/enabling-navmesh-walking-mode-seems-to-do-nothing.html

lost tiger Mar 18, 2018, 7:02 PM

#

Hello friends. someone available to help me in my video game (payment in between) if you have enough knowledge in programming

hybrid grove Mar 18, 2018, 8:43 PM

#

@patent hornet was that response for me?

elfin socket Mar 19, 2018, 12:13 PM

#

Is there any rhyme or reason to put the AIPerception components on the Character rather than on the AIController? In the UE4 Livestream, they put it on the AIC, but in the Tom Looman Udemy course they put the AIPerception on the Character.

tribal lagoon Mar 19, 2018, 12:45 PM

#

How can I use AI move to on my player character, the node doest fail, but it doesnt move the character either, nav mesh is built

elfin socket Mar 19, 2018, 12:51 PM

#

@tribal lagoon Pawns without an AIController don't know how to do AI Move To

#

Player Pawns don't have AIControllers

tribal lagoon Mar 19, 2018, 12:52 PM

#

yeah, thats what I thought, can I add an AI controller to one

elfin socket Mar 19, 2018, 12:52 PM

#

Instead of telling the pawn to do it, tell the pawn's AIC to tell the pawn to do it

tribal lagoon Mar 19, 2018, 12:52 PM

#

I am not going to use any keyboard or mouse imput, its only move to, for the movement of my pawn, so it would make sense to switch to AI controller only

elfin socket Mar 19, 2018, 12:53 PM

#

The PC needs to possess something, so have it possess something else and tell the pawn to have an AIC

tribal lagoon Mar 19, 2018, 12:55 PM

#

how can I do that

elfin socket Mar 19, 2018, 1:17 PM

#

@tribal lagoon https://www.youtube.com/playlist?list=PL1TXEg4tYMjm7NYGgKDwoj-1y6ZuMCb_Z

YouTube

Ai Training for Unreal Engine - YouTube

A list of the videos I found useful learning AI for UE4.

tribal lagoon Mar 19, 2018, 1:19 PM

#

thanks, unfortunately I don't have time to learn all of this now

#

I am prototyping for a touch game on mobile, and it doesnt need to be that complicated, my AI is just moving where I click with the mouse, but I cant get the player pawn to swap to an AI controller

tribal lagoon Mar 19, 2018, 2:33 PM

#

Maybe I am not understanding the hierarchy of UE4 right

#

I cant send commands to something I dont posess right

#

So if I want to control something using AI Move to, i need it to be possesed by an AI controller, and for me to control it, i need to posses a player that casts to that AI and issues comands?

fluid sequoia Mar 19, 2018, 3:07 PM

#

@tribal lagoon I ran into this issue developing my own mobile game and settled on having the visible Character controlled by an AIController. Then, I have a separate pawn which is invisible called PlayerAgentPawn that is attached to the Character. PlayerAgentPawn has the PlayerController.

tribal lagoon Mar 19, 2018, 3:08 PM

#

I am trying to get that exact thing working as you wrote this lol

#

how do you attach the camera to the AI, by simply parenting it in the level?

fluid sequoia Mar 19, 2018, 3:09 PM

#

    DungeonCrawlerPlayerCameraBoom = ObjectInitializer.CreateDefaultSubobject<USpringArmComponent>(this, TEXT("CameraBoom"));
    DungeonCrawlerPlayerCameraBoom->SetupAttachment(DungeonCrawlerPlayerCameraScene);
    DungeonCrawlerPlayerCameraBoom->bAbsoluteRotation = false; // Player rotation will not affect boom rotation
    DungeonCrawlerPlayerCameraBoom->TargetArmLength = 1200.f;
    DungeonCrawlerPlayerCameraBoom->bDoCollisionTest = false;
    DungeonCrawlerPlayerCameraBoom->bEnableCameraLag = true;
    DungeonCrawlerPlayerCameraBoom->bEnableCameraRotationLag = true;
    DungeonCrawlerPlayerCameraBoom->bInheritPitch = true;
    DungeonCrawlerPlayerCameraBoom->bInheritRoll = true;
    DungeonCrawlerPlayerCameraBoom->bInheritYaw = true;

    // Instantiate player camera
    DungeonCrawlerPlayerCamera = ObjectInitializer.CreateDefaultSubobject<UCameraComponent>(this, TEXT("PlayerCamera"));
    DungeonCrawlerPlayerCamera->SetupAttachment(DungeonCrawlerPlayerCameraBoom);```

#

You can handle it in CPP or BP, I attach the camera to the AgentPawn since the PlayerController will automatically go to the camera attached to the same pawn/character

#

This is a setup for a top down game by the way, so your implementation may vary

tribal lagoon Mar 19, 2018, 3:11 PM

#

Alright, I will try it once I sort out the jumping

#

for some reason the AI doesnt jump to reach its destination

#

even with nav links

fluid sequoia Mar 19, 2018, 3:12 PM

#

nav links are kinda buggy

#

I don't think jumping behavior is actually present in nav link implementation

#

@tribal lagoon As I understand the way nav links work is that they merely state that two points on paths are connected

tribal lagoon Mar 19, 2018, 3:14 PM

#

yeah, so how do I tell my AI that it can jump

#

I am using the paper 2D template

#

maybe thats the issue, as I remeber an AI I made was jumping on with a third person character template

fluid sequoia Mar 19, 2018, 3:15 PM

#

" It's currently not supported out of the box and would require some C++ coding. You can however implement a kind of jumping behavior with navlinks and triggers. Navigation links tells AI "you can traverse this segment", so if you place a link between two platforms AI will find a path as expected. You just need to take care of the jumping part, and you can "fake" it by placing a trigger on the link start that will make AI move to the other end.

Making "AI move" could be done in couple of ways: you can simply teleport your AI, matinee-animate him, or set his physics to Flying and just let him continue (should work, but I haven't tried it ). If using the flying option don't forget to turn Walking back on once "jump" is done"

https://forums.unrealengine.com/showthread.php?3512-NavLink-and-making-AI-jump

NavLink and making AI jump? - Unreal Engine Forums

For gameplay programmers writing C++ code.

#

This is from an ancient answerhub post https://answers.unrealengine.com/questions/84659/navmesh-jump-points.html

#

OK so ancient I suspect things may have changed since then

#

@tribal lagoon You can implement jumping while navigating by having a trigger box which causes a certain behavior and the beginning of a navlink, for example a "launcher" that throws the character up. It is also possible to write an advanced implementation of the navigation to have the character calculate jumps in real time, I believe Rama did a quasi-tutorial on it

#

The Rama tutorial is here https://wiki.unrealengine.com/AI_Navigation_in_C%2B%2B,_Customize_Path_Following_Every_Tick

AI_Navigation_in_C%2B%2B,_Customize_Path_Following_Every_Tick

tribal lagoon Mar 19, 2018, 3:20 PM

#

Well, at this points it would be easier if i added slopes

fluid sequoia Mar 19, 2018, 3:20 PM

#

Sometimes the simple solution is the best one

#

If you have your characters jumping only at specific location then launchers can be a good solution

tribal lagoon Mar 19, 2018, 3:21 PM

#

I need it for playtesting

#

I thought UE had jumping, so the AI can go on the floor above

#

guess i will have to fake stairs with slopes

tribal lagoon Mar 19, 2018, 3:41 PM

#

📎 unknown.png

#

📎 unknown.png

#

that was about as complicated as the jump thing but anyway

#

@fluid sequoia thanks

fluid sequoia Mar 19, 2018, 4:17 PM

#

Anybody familiar with UNavigationSystem::ProjectPointToNavigation , I don't quite grasp the arguments

#

Specifically why do I pass in an FNavLocation and an FVector point?

vocal sinew Mar 19, 2018, 8:14 PM

#

Hey guys! how to character disable rotation when I do AI MoveTo?

#

I want to move my character, but controller should be always forward to some target

glossy spire Mar 19, 2018, 9:05 PM

#

@vocal sinew Uncheck "Use Controller Rotation" on the pawn

#

then you'll have to rotate him yourself

vocal sinew Mar 19, 2018, 9:08 PM

#

@glossy spire But I need to rotate controller, not character. Character Must use controller rotation

#

I just don't want "MoveTo" to change controller's rotation.

#

Orient To Movement checkbox is also disabled

glossy spire Mar 19, 2018, 9:22 PM

#

i guess you could change the rotate speed to zero

#

on the character movement component

woeful wind Mar 19, 2018, 11:59 PM

#

Hey guys, I've got an AI character class that inherits from my normal character class. I'm trying to re-use as much logic from there as possible; things like drawing and firing a weapon, taking cover, etc. The problem is that I handle all of my aiming code using the player Control Rotation, which doesn't seem to be a thing in AI. If I could just "SetControlRotation" on my AI character (which appears to be deprecated functionality long before 4.18), I'm pretty sure my problems would be solved. Is there any way that I can set control rotation? If not, I pretty much can't inherit from my other character, because so much of the logic is bound to that attribute.

patent hornet Mar 20, 2018, 12:13 AM

#

you can pull the common functionality in common base class and have both your AI and normal character class inherit from it

woeful wind Mar 20, 2018, 12:44 AM

#

@patent hornet Hmm...still a lot of rework, but I guess if there's no other way...

buoyant sphinx Mar 20, 2018, 12:52 AM

#

@tribal lagoon I blog about how to make launchpads here: https://www.vikram.codes/blog/ai/02-nav-modifiers-links

Vikram Codes

Navigation Modifiers and Links in UE4

Learn how to use advanced features of the UE4 Navigation system, including how to make an AI jump off cliffs, and also make use Launchpads to make your AI jump back up!

#

@fluid sequoia for your future reference as well ^^^

fluid sequoia Mar 20, 2018, 12:55 AM

#

@buoyant sphinx thanks, will have a read

buoyant sphinx Mar 20, 2018, 12:57 AM

#

As of 4.19 it's possible to do everything in blueprint, I'll be updating the guide this weekend to show how

#

(I had a pull request accepted, you should be able to figure out how, because I show what I was trying to do in the #Issues section at the bottom)

lethal helm Mar 20, 2018, 1:01 AM

#

When spawning Ai char's from class do you have to spawn an ai controller as well?

tribal lagoon Mar 20, 2018, 1:14 AM

#

@buoyant sphinx thanks

delicate sparrow Mar 20, 2018, 2:25 AM

#

How do I create a function that does AI Move and collision checks at teh same time?

elfin socket Mar 20, 2018, 4:00 AM

#

@delicate sparrow I think the Nav Mesh does that automatically for you, doesn't it?

delicate sparrow Mar 20, 2018, 4:01 AM

#

Well I tried to make a function like you suggested within a pawn to do AI move and collision checks but it wouldn't let me use AI Move there

#

But would I use something like "Event On Hit" for Collision w/ collider?

elfin socket Mar 20, 2018, 4:03 AM

#

Overlap is what you use for collision, the OnHit thing is for dealing damage to actors.

delicate sparrow Mar 20, 2018, 4:04 AM

#

What about just "Event Hit"

elfin socket Mar 20, 2018, 4:05 AM

#

I think you might need to do some more tutorials dude

delicate sparrow Mar 20, 2018, 4:08 AM

#

I mean, that's not wrong, but googling this hasn't really gotten me anywhere

elfin socket Mar 20, 2018, 4:10 AM

#

When all else fails, I go straight to answers.unrealengine.com and search there

#

But I really think you should just do some more of those official UE4 livestream tutorials from the engine developers. They have some stuff about AI and it's really good quality stuff that will help you fix your problems along the way.

woeful wind Mar 20, 2018, 1:17 PM

#

Hey guys, I'm a bit stumped. I posted this on reddit, but so far, no response. Long story short, I can't make my character rotate via AI functionality, but he does other actions just fine.

https://www.reddit.com/r/unrealengine/comments/85p9sg/running_into_difficulties_with_my_first_foray/?st=jezoo3i2&sh=1fa04f31

Running into difficulties with my first foray into AI behaviors, s...

Hiya, folks. I've been diligently working on my third person shooter prototype in my free time for over a year now, and I finally got to the...

#

Any help would be appreciated.

fluid sequoia Mar 20, 2018, 3:23 PM

#

For the life of me I can't get AI debugger to work, I enable show ai debug and click on the controller but nothing happens. Any clues?

#

nvm, had to look in engine settings and realize I rebound gdt

heady arrow Mar 21, 2018, 2:18 PM

#

@woeful wind have you tried setting the focus of the AI controller to be the player? Also there is a specific edgecase where focus only works in the yaw for something but I can remember what, but that function is virtual and can be overridden

tribal lagoon Mar 21, 2018, 3:18 PM

#

Hello, can I use Pawn Sensing to detect a character being possesed by an AI controller

patent hornet Mar 21, 2018, 5:15 PM

#

i don't think its meant for that

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you should have OnPossessed event tho, inside the character

tribal lagoon Mar 21, 2018, 5:17 PM

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what do you mean, how would that enable another actor to sense it?

patent hornet Mar 21, 2018, 5:22 PM

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you could attach something to it that another actor can sense with PawnSensing

woeful wind Mar 21, 2018, 5:40 PM

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Thanks @heady arrow , I'll give it a shot later today. It seems weird that I'd have to set focus on the player to turn toward him, but I don't have to do that to MoveTo him.

tribal lagoon Mar 21, 2018, 5:55 PM

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@patent hornet i wasnt aware that would work, what actor should I attach to my AI so its detected

woeful wind Mar 21, 2018, 7:10 PM

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Thank you so much, @heady arrow ! Setting the focus worked! I stand by what I said earlier in that it's odd that some things work without focus and some things require it.

heady arrow Mar 21, 2018, 7:12 PM

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@woeful wind yeah in the source code of the AI controller for focus, it sets the pitch to zero for a specific reason that I can't remember

tribal lagoon Mar 21, 2018, 7:13 PM

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So I created a pawn actor, and attached it to AI, but pawn sensing still wont work

woeful wind Mar 21, 2018, 7:13 PM

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Hmm...okay, well, good to know. Does that mean it always needs a focus to turn...ever? Even if it did its own thing agnostic of the player's actions?

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So I'm still pretty new to AI in Unreal, but I'm failing to see why Decision Trees and Blackboards exist at all. Normal blueprints seem perfectly capable of doing all of this stuff. What's the benefit here?

glossy spire Mar 21, 2018, 8:04 PM

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@woeful wind Blackboards are pretty pointless, but decision trees are very important

woeful wind Mar 21, 2018, 8:05 PM

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Is it a performance thing? Is there something Decision Trees can do that blueprints can't?

glossy spire Mar 21, 2018, 8:05 PM

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decision trees are just a way to run blueprint tasks

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so the code is done in tasks and decorators

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hmm its hard to describe

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basically, when you start getting more advanced AI, having lots of if statements or whatever becomes really messy

woeful wind Mar 21, 2018, 8:08 PM

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so it's just an organizational thing? Easier to rapidly make changes than messing with blueprints?

glossy spire Mar 21, 2018, 8:08 PM

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well, decision trees run blueprint files

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so its still working in blueprints

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you make tasks

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which are a kind of blueprints

woeful wind Mar 21, 2018, 8:09 PM

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no, I get that, but I also don't see why I couldn't code the entirety of the decision tree in my AI controller

glossy spire Mar 21, 2018, 8:09 PM

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you could, for some projects

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but most likely you'll have giant IF-THEN graphs

woeful wind Mar 21, 2018, 8:09 PM

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ok, so it COULD be done, but it would be messy?

glossy spire Mar 21, 2018, 8:09 PM

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sure

woeful wind Mar 21, 2018, 8:10 PM

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I'm all for best practices; I'm just trying to understand why this is the best practice.

glossy spire Mar 21, 2018, 8:10 PM

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another way of doing AI is with a state machine

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but basically a decision tree is the more modern way

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but yeah, its a glorified organization method

woeful wind Mar 21, 2018, 8:11 PM

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gotcha, thanks for the explanation

glossy spire Mar 21, 2018, 8:11 PM

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but I have no idea why people use blackboards

woeful wind Mar 21, 2018, 8:12 PM

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To store data that your decision tree uses.

glossy spire Mar 21, 2018, 8:12 PM

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yeah but why

woeful wind Mar 21, 2018, 8:12 PM

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heh, same thing: organization

glossy spire Mar 21, 2018, 8:13 PM

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yeah

tribal lagoon Mar 21, 2018, 11:25 PM

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So, I have a mobile game where i set the camera view target of an AI, form my possesed character (just a camera really) so i can issue commands using touches on the screen

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but the thing is I cant get the pawn sensing of other objects to detech the bot that I am issuing commands to