How to Make a Simple Behavior Tree in Unreal Engine 5 - Advanced AI

Hello guys, in this quick and simple tutorial we are going to learn how to make a simple AI using Behaviour Trees in Unreal Engine 5
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[@alefet.8861]

Thank you for the tutorial! I've watched multiple tutorials of different channels and by far this was the best. Most of them just talk about part of the things you need to know, and you covered most of those in a single video. Your approach was the most modular I saw, loved it!

[@mate1_dev]

Those aren't tutorials those are courses

[@arvid8548]

I've watched so many of your tutorials lately...and I just want to say how much I appreciate you and your channel! Keep up the amazing work 💪

[@ControlStealDelete]

Thank for taking the time to do this! The choices you get when you click 'New Task' are the parent blueprint that this new one will inherit from. You can see this displayed in the top right corner of your task asset window.

[@anarchychicken69]

These are the only good tutorials I have seen on KZbin Because I can just go do it in UE5 real fast and It feels way better than sitting around for hours waiting for a 4 hour video to show a 5-to-10-minute thing. Keep this up man. Thanks.

[@james_fisch]

Thank you so much for this tutorial. I spent a good several hours working this out today when I was having issues with getting my NPCs to do anything other than being stuck in their animation cycle when they were in the idle position, and this was the best tutorial I found on it.

[@mitchalegron4977]

You have been very helpful in my Game Design class that I am in right now, I really appreciate your tuts and like how you get to the point. Thank you. I am now subscribed. Keep up the good work.

[@koshabi]

Thank you! Love your tutorials, nice and simple to understand!

[@GorkaGames]

thank you!! I`m glad that you find them helpful!

[@guritfakgill8173]

Just came from your third person shooter tutorial because I wasn't happy with the basic blueprint ai logic, but the behavior tree looks good. Appreciate the effort, thank you. 👏 🙌

[@PhilippeMesnildrey]

Great and simple, well done! And thank you

[@wolfiedgr8t]

Easiest behaviour tree/ai tutorial I’ve seen. Really understood it, thanks man❤ P.S. would love a more in depth tutorial on how to add shooting and attack behaviours to this.

[@GorkaGames]

Thank you man, I`m glad you found it useful!! Yeah I have planned making more videos about behavior trees with more functionalities

[@magegames6202]

@@GorkaGames seriously awesome tut would definitely love to see how to add attacks and maybe choose a random attack to do out of a few i have

[@tejtuladhar2658]

Can you please make more AI tutorials. This was very helpful. Thank you!

[@dorondavid4698]

Your video is very well explained...tough to find that with Unreal videos...thanks!

[@GorkaGames]

my pleasure!

[@mbenson501]

Great Tutorial Thanks so much!

[@krasnavin]

Great tutorial. Easier BT than others. Definitely using in my new game.

[@DanielRodriguez-tf1pb]

This was a great video, I can not however figure our a way to stop the chase once sight is lost, does anyone have a tutorial on how I can set that up on using pawnsensing?

[@gameflix7510]

your chanel is the best on youtube about unreal engine 5. everything always works perfectly👍👍Tnx

[@JustJoshinYouBro]

This was a great tutorial and straight to the point.

[@krStavrev]

Thank you! Great explanation!

[@GorkaGames]

thanks!!!

[@JustJoshinYouBro]

If you guys want to increase AI speed on detection, just go to BP_AI or whatever the name is for your AI blueprint. Then drag the character movement component from the components tree into the blueprint event graph and click get if it asks. Drag from that node and type Set Max Walk speed. Connect the (Set Max Walk Speed Node) into the cast to BP_Thirdperson Node and into the Set value as bool. This will make the AI increase its speed when detects you. Simple but some might need insight so I figured I'd share.

[@arkgamer742]

idk if you already did one but could you do a tutorial on AI with ranged attacks such as guns?

[@undisclosedpolitics]

Good job Gorka. Keep it up.

[@GorkaGames]

thank you man!! I really appreciate it!!

[@FlamingCowHead]

Good tutorial! Had to watch at .5 speed though and still had to back track to see what you entered or clicked. You should slow down a bit and pause before clicking things so people can watch what you are doing and follow along. Great video though!

[@justinkeess]

This was Basicly very Helpful so Basicly Thank you for basicly your tutorial basicly

[@madridfan9946]

Hey gorka, how would i code the realistic tennis plsyer movement??

[@thomasrodriguez7587]

how can you make the transition between the running animation and idle animation smoother?

[@KingLouie111]

Great video!

[@thomassandrottek9888]

Thank you verry much! I had a little issue with the "wait" I needed to put it direct under the sequencer to get it work. Just in case anyo has this problem too. ;)

[@Punisher1992]

You may will use Access Property Node for all Animation stuff, like velocity, and booleans from the Actor Blueprints. Its way cleaner and versatile.

[@SamuTheFrog]

Learned a lot more than I thought I would, and I thought I'd learn a lot 🤣

[@user-js2tm8pr9w]

hi! can you please tell me how to make ai chase an other ai not the player ? because in my game ai is not chasing the player thanks? i did't find any toturial about that ?

[@dardiken1332]

i dont know if you can help me, i get a runtime error saying, "Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue", and i dont know what i have done wrong

[@blader7823]

thanks for the video i liked it

[@user-nd5kh7vu7i]

hey bro, can you help me? my ai It's not moving when sees me, do you have any Idea of what is going on?

[@calvinsmith9207]

worked perfectly

[@ousroardev]

thank you it's realy helpfull

[@oliverko8533]

Great tutorial. I did almost everyhing the same but my character is sensing me on entire map i tried to lower tresholds and nothing worked.

[@user-bj8bs3rg5q]

Thank you for the lessons. Very helpful videos. Can you make flying artificial intelligence lessons like a spaceship or a submarine? not tied to the earth?

[@nas7em]

Thank you very much, that's really good tutorial. So how can I reset bool to false when the enemy is not seeing the player and make enemy goes to the initial state in which he roams around? so the player can run away from enemy. Thank you again.

[@mrtnvoices]

Pretty sure you found your answer already, but in case anyone else is wondering, here's what I did: - In the AI blueprint, I connected "Set Value as Bool" to a "Retriggerable Delay", and set the duration to 0.6 sec(*). - After the "Retriggerable Delay", add another "Set Value as Bool", set bool value to negative, and connect it to the same components as the other one. (*) Make sure duration is longer than the Sensing Interval in the PawnSensing component of the Blueprint (default: 0.5 sec).

[@zixzen1]

@@mrtnvoices bro you're literally a life saver, legit looked at 4 other tutorials and looked for his comment on his video and it never came up! thank you

[@okay9904]

@@mrtnvoices can you explain it a little more?

[@user-js2tm8pr9w]

can you please answer me. i did the same as you did in this video but ai can't chase an other ai not the player ? because in my game ai is not chasing the player thanks? i did't find any toturial about that ? ake

[@HameStudio]

Thanks

[@d180jnr]

Hey i'm having issues with my AI it doesn't seem to return back to patrolling when line of sight is broken is that intentional?

[@PerumNagajaya]

can anyone tell me how to abort the chase player if the pawn out of range or interrupted by obstacle

[@tylerpierce618]

Huge ask here but would you consider doing a video where you use interfacing instead of casting and show examples of how you would do them in different projects? Not necessarily a tutorial but a high level overview with practical examples using some of your other videos are reference. I think its probably a niche thing but would definitely help some of us of getting into that mindset of soft and hard references etc.

[@mate1_dev]

I already done this like 3 times so I know how to do it but everytime something doesnt work dont know if its because of different ue version but for me I had to add a retriggerable delay of 0.6 seconds to set the value to hasseenplayer to false and everything worked

[@Pwnclips]

Little confused why every video i see, people using blendspace 1d. Any reason to not being using the new one?

[@chupitolepame5357]

Could be the case that this only works with camera following the player? I'm using fixed cameras and nothing of the chasing part works.

[@Silent_Chief]

Hello i try to hide from the ai , but everything i tried dont work , is look like the ai can see me everywhere , how can i hide or put off sensing when my character is hide in the locker for exemple ?

[@KaitheArtGuy]

I want to make my NPC adjust their speed based on the proximity to the player. I followed the tutorial, and my NPC only runs at the set speed, regardless of how fast the player is moving. Is there a way to do that in a Behavior Tree, or is that a blueprint feature?

[@ishansingh4005]

Thank you, I have a bug that whenever like I go onto the stairs the AI character gets stuck at the stair but the Behaviour Tree is still working. UE4

[@Blue-qr3dx]

Thank you for the tutorial, but my ai keeps chaing me when im out of sight, how do i make it so that it stops chasing me when it cant see me?

[@eli1525]

awesome stuff mate - thanks so much for posting this!

[@Shimneydust]

How do i hide from the enemy like in a locker or under a bed?

[@armin5808]

Just in time 💪💪

[@GorkaGames]

🤩💪

[@billedefoudre]

Awesome tutorial! Thanks a whole lot for this! Is the NavMeshBoundVolume just a visual clue for dev, though ? (as it doesn't seem to be linked to anything in particular ?)

[@Skittlez]

NavMesh will dictate where the AI can walk around! It is a visual clue so you can know where they can go but it also changes depending on what settings you have put for your AI

[@elizz4007]

Hi! Great video, absolutely loved it. I have a question though, when the AI is roaming, how do I make it basically walk slower and once it sees the player, it starts running full speed?

[@magegames6202]

after the player chase get a reference to your enemy bp off that get the character movement and set max walk speed off that but remember to go back to your roam and add the same but set max walk back to normal speed

[@cesarcarmona8353]

Hi! really useful tutorial, thanks! Got a question... In my game I want the enemy to start roaming again when they stop seeing you, is there any way to turn the bool false again? tried to expand the sequence with a stopchasing task but it won't end even with the finish execute

[@nas7em]

Same question here.

[@tylercooper7396]

Have you figured it out yet ?

[@heavenseek]

Hey Master Gorka, Can I request a small addition to this video if you get the time? It relates to this video and also to the combat series you've made... I think that the order you intended for us to follow may be something like this: 1) HOW TO CREATE A COMBAT SYSTEM IN UNREAL ENGINE 5- #1 Tutorial 2) HOW TO CREATE A COMBAT SYSTEM IN UNREAL ENGINE 5 - #2 Tutorial 2b) How To Equip A Weapon In Unreal Engine 5 2c) The Easiest Way to Make a Simple Enemy AI in Unreal Engine 5 *2d) How to Make a Simple Behavior Tree in Unreal Engine 5 - Advanced AI* 2e) How to Make a Simple Health System in Unreal Engine 5 3) HOW TO CREATE A COMBAT SYSTEM IN UNREAL ENGINE 5 - #3 Tutorial I followed most of these and really benefitted! But, In place of #2c ("Easiest way... Enemy ai") I went with this "Simple Behavior Tree" one; in order to have potential to develop more thoughtful ai in the future. The only thing is: this "Simple Behavior Tree" video ends with the ai just chasing and not attacking. I tried to implement the nice attack action you did at the end of #2c into my version of this, but I failed. If you could make a little add-on / follow-up tutorial to this one: on how to get the ai to take a swing at us once it catches us, (or any combat action) it would be great!! It would hopefully link up with the final #3 COMBAT SYSTEM just as seamlessly.

[@GorkaGames]

Thank you so much for the detailed feedback!! Yeah absolutely, I will make a follow-up video on making this AI with behaviour trees attack the player when it gets close, as I did with the other Enemy ai tutorial. I will also try to create a playlist and add all those in that specific order, as it will help other devs to see which one to see first etc. Again, thank you, I really appreciate your support!

[@heavenseek]

​@@GorkaGames That's awesome! *And* that would definitely serve as a 'Go-To' playlist for many people.

[@heavenseek]

I forgot to add in the *2a)* slot: "How to Make a Simple Pick Up System in Unreal Engine 5 - Beginner Tutorial"

[@user-ym1hx7co8v]

Question how would i tell my enemy AI not to chase me anymore when im out of line of site?

[@noahjanosek8061]

Never mind I fixed it but how would I make the walking animations play like idle works but not walk?

[@GorkaGames]

I guess the blendspace or your anim bp wasnt set up correctly. Check that its casting to the ai

[@danielsoto5494]

Anyone know why that when I package the project nothing works with the AI behavior ?

[@kingcatmemes]

Does anyone have a fix for a blank blackboard

[@Gnomesnob]

hey! Thank you for the guide. so my AI is roaming around like they should, but when they see me and start "chasing" they go in weird directions, aka not following me(I see that the chasing sequence is applied in the behavior tree)

[@mate1_dev]

Mine just stops did you find a solution?

[@griseldaflores6362]

For me, it was because I forgot to check a value for is player seen

[@williamminnaar6311]

Good day - Do you have any tutorials like this for an advanced NPC - Walk, idle - sit on a bench, deciding to choose which thing they want to do themselves? Natural looking humans walking around :)

[@maxdemax2655]

How would you do this in Multiplayer? And than I mean with chasing the player, tried some things but didn't work and just got errors.

[@renisrrenis9225]

this tutorial is useless, the dude doesnt know how truly programming works at all.

[@20onthetable85]

Hello, any way to get the ai to decelerate a bit slower? I tried messing with thr braking friction to no avail.

[@GorkaGames]

There is actually a paramterer in the "Character Movement Component" called "Braking Deaceleration Walking"

[@I-VisiBomb-I]

@@GorkaGames when the character stops its animation just snaps from running back to idle instead of blending. you can also see it in the video, and you didn't touch on that.

[@renisrrenis9225]

@@I-VisiBomb-I all his videos are useless on making versatile and flexible game development, its just cheap tricks to make it work for single purpose, aka farming views.

[@Enderking394]

How do I make the enemy walk slower?

[@rlb1968able]

Is there a way I can make a prompt that lets you know the enemy is chasing you? Like an eye opening and closing.

[@LazyAnimations69]

I added an audio on my enemy's BP and when his close, the music slowly increases as he closes the distance

[@alexisschutz4822]

Hello ! And thank you for this tutorial, very clear ! I follow this steps until 10min, but my AI doesn't move randomly. It's for 2D topdown game, with paper character, is there something different to do ?

[@ansh9677]

It because the NavMesh didn't load in the game, try changing your collision thickness of the tilemap to 500 and building the game again and it should work

[@alexisschutz4822]

@@ansh9677 Thank you for your help !!

[@atomicplays8478]

How would I make to where if the Ai looses sight of the player, then it goes to the player's last known location and resumes roaming around?

[@GorkaGames]

you will need to make a constant loop setting the target var in the blackboard empty. As the pawn sensing doesnt contain an "On Lost Target". The thing is that is looking at a trarget, it will override the constant loop

[@checho8576]

@@GorkaGames I'm new to Unreal and I don't really understand how to do it, could you explain a bit more in detail please?

[@meh-yu5yh]

Everything works perfectly however I came across an issue where once the ai loses sight of me he just stops and I can walk up to him directly without him chasing me again, Hopefully this makes sense? Is there a fix for this by any chance?

[@griseldaflores6362]

sounds like it's probably the timer maybe?

[@timelordst]

Hi. i want to ask something. you made the navmesh so big that you didnt encounter this issue. but when i exit the navmesh the AI stops working. doesnt goes to random roam. please send some ideas over here

[@Leonardo-zb6ho]

Found a solution?

[@creativemosquito]

Hi love your tutiorial, one quiestion is there a way to make the ai stop following you when he loses sight. because when he sees me he follows me forever

[@GorkaGames]

yeah you will need to have a constant loop setting the blackboard value to false because it the enemy is still seeing the player it will override the value and turn it back on.

[@DegiovaniLives]

Coloca legenda em português por favor no seus videos

[@vadimmironov343]

Hey, how can I make it so that the ai stops chasing me after I get out of sight? Thanks!

[@Krushila2]

Have you found an answer to this?

[@priboi288]

Bro I want to fire from a gun actor which isn't attached from the main player bp .. how can I call the fire function? When i hold left click pls help me i am working on a game and I'm stuck here

[@GorkaGames]

You could use an interface or directly cast to the gun`s Bp and call the function from the main player

[@priboi288]

@@GorkaGames thankyou sir ... ♥ from india

[@GorkaGames]

@@priboi288 my pleasure, greatings from Spain!

[@priboi288]

@Gorka Games BP Interface required an actor how can I get the actor .. 😓

[@priboi288]

@@GorkaGames i just stared unreal engine and I don't know much about it I am really sorry if I am disturbing you..

[@blacktecno]

The chasing isnt working for me. Instead of the character Ive created a pawn BP for the AI to chase. When creating the HasSeenPlayer, if I just cast it nornally the AI just roams around, if I set the Bool on "cast failed" it will actually go to the cube's location, but only once, it wont follow it nor roam around again. 😅

[@blacktecno]

Okay, I had to disable "only see players". Now it does go to the box, but if I enable physics to move the box the AI doesn't follow. Does the BP stay in place even if the box moves? How could I change that?

[@tonyfoxx7217]

Hi, a very good lesson, I do everything like you, but for me, the actor just stands and is not active. Where can I throw the screen to you?

[@GorkaGames]

Thanks! Make sure that you added the nav mesh to the scene. And if it still doesnt move, just reload the level, it might have unloaded the nav mesh

[@tonyfoxx7217]

@@GorkaGames Thank you, I'll try to do this, well, it's written to me that BP_AI and nav mesh unload

[@tonyfoxx7217]

@@GorkaGames Everything works, thanks, I reloaded the level))

[@GorkaGames]

@@tonyfoxx7217 Great!

[@tonyfoxx7217]

@@GorkaGames in general, my main profession is an electric welder)) Thanks to your guides, it’s easy to master UE 5, I hope someday I will change my profession as an electric welder to the profession of a game developer and yes, I’m from Russia))

[@TheRmva2]

Have you recorded this on Christmas? Respects... And thanks!

[@DogeTheShibe]

1000x better than Epic's Official Tutorial!

[@argmon9090]

hehe the hair on the mannequin , the physics look nice tho

[@murfmusik3407]

Brilliant tutorial, but my enemy doesnt follow me and cant figure out why, everything else works well he patrols about randomly etc

[@Frostbyte0010]

After seeing the player the ai doesnt abort the chase to roam around even after it lost track any help pls

[@adriandorobat3149]

since the 'has seen player' boolean is never set to false, of course it continues forever.

[@timboslice5351]

I get to the point where I put in the Nav Mesh Volume, lock the values to 50 and after that it just starts to "Build Navigation (8)" for eternity and there is like one little green square on my big ass plane. Can someone help?

[@GorkaGames]

So basically it never completes the nav mesh?

[@timboslice5351]

@@GorkaGames Yes. It just keeps building navigation :/

[@timboslice5351]

@@GorkaGames I got it. It Works again. Don't know why though.

[@HarelVolotzky]

Happy holiday! I wanted to ask you a question related to unreal. I'm making a horror game and I basically want to make a kind of character that chases you and if it touches you there's a Jumpscare. how can i do that I would be happy if you answer me! Thanks and happy holiday!

[@GorkaGames]

Happy holiday to you too!! Thanks, you know what, just yersterday I was doing exactly that!! Like a Hello Neightbour type of horror prototype. So basically this behavior tree is a good start, the AI will search through the area until it sees the player, and hen it will start to chase him. The next thing you want to do is to add a sphere collider in front of the AI`s mesh, so that if the player enters that area, the enemy will make the jumpscare, and I have a tutorial on that too! kzbin.info/www/bejne/qnrLaYiVrJ6XqJY

[@HarelVolotzky]

@@GorkaGames I made the jumpscare you showed (with the trigger) separately in my game at the moment and I also made the character chasing the player separately. How can I do that only if during the chase of the monster and the player, the monster touches the player and only then will the jumpscare appear. Hope I was clear.

[@gamingman936]

@@HarelVolotzky There is also a node that is called is overlapping actor

[@notgamingwithfaz]

My only issue with this is that once you leave the area and come back the ai just stops moving completely.

[@AlexC0601]

Justo lo que necesitaba, pero podrías subir un vídeo hablando más a profundidad por favor ?

[@GorkaGames]

Si claro, voy a hacer mas sobre behavior trees!

[@AlexC0601]

@@GorkaGames muchas gracias ando con unreal 4.27 y quisiera usarlo para hacer un boss final

[@evgeniydragondog]

Is it works for UE4? Boolean from BB wont change

[@GorkaGames]

yeah, are you accessing correctly to the blackboard value?

[@evgeniydragondog]

@@GorkaGames . Thanks for response! probably. Will check it later

[@evgeniydragondog]

@@GorkaGames SOLVED. I just forgot SELF before get AI controller

[@shingAMarie]

everything seemed clear to me, except for your explanation of the decorator conditions. The meanings of is not set is hazy to me especially when you are using a boolean. I’m not sure how that works. It’s almost like it’s true or false or how would that apply to a different type of variable, etc.

[@alexpoc]

mine only goes to waiting and just skipp the Moving part...

[@insertalias8172]

My Ai doesn't have any animations what should I do? 12:46

[@coreragestudios3430]

Open your character animation blueprint and continue from here in anim graph 11:50 Or Go into character blueprint, then click mesh character on the left, then go to your right where you see transformation, sockets, animation etc, look for anim class and select the animation you want for him.

[@DronX_]

How to make a flying or swiming AI?

[@GorkaGames]

that would be a cool tutorial to make, I will note it down!

[@islandonlinenews]

My behaviour tree always says inactive...

[@DaysVFX]

The AI isn't chasing me, unfortunately. But, it can move around. I just don't think it's detecting my character. Is it because I'm using a first person camera rather than a third person mode?

[@GorkaGames]

could you debug your behavour tree and check if it passes through the chase sequence?

[@30hig67]

Same Won't work on first person i think

[@eec4424]

i had the same problem, it worked to delet the pawn sensing and then add it again

[@nirupamasamal9561]

Yes if you are using same settings as him. Don't know if you are using settings according to your fps camera. From Settings i mean the name the ai has to chase

[@SamuTheFrog]

Having the same issue, currently debugging & brain storming. Surely it is a simple fix. Even removing the entire left side & leaving just the chase side, it just won't go through. I followed the steps to a T with one exception: I cast to my custom player character blueprint instead of the third person, which is built off of the first person template player character. The same cast work for all else in my project so i don't believe I've casted wrong. Will post update if I find problem/solution.

[@noahjanosek8061]

Hmm everything else worked but for somereason he wont chase my character?

[@GorkaGames]

probably the nav mesh unloaded. Just re-open de level

[@spacepigeonstudios]

It was bugging me that you said "I don't know why you can choose a name, it doesn't really matter, when creating a new task". You probably know, but you created a child class with the chosen "name" as the parent class. at 14:30, look top right, parent class. Parenting is an important concept for complex projects. Other that that, awesome tut, thanks a lot.

[@ChristopherFranko]

Drinking game. Everytime Gorka says basically. you take a shot. Call an ambulance first.

[@AllahomAnsorGaza]

i think you miss with blackboard section please recreate this video we cant understand nothing from aaa i'm gonna say aaa mmm

[@30hig67]

The AI isn't chasing me im using first person.

[@SoundsLikeGlitter]

My AI still won’t move

[@kraulim]

all tutorial are the same, move to random location ... and wait x seconds .... Its good to show how to move character for a "custom" location