A.I State Machine Made EASY (Unity)

[@SebastianGraves]

For anybody watching this video now who wants to see a series use a similar state machine whilst going into greater detail check out my "Elden Ring In Unity" series playlist here! kzbin.info/www/bejne/pXOcXp6kqJmgb5Y

[@StratEdgyProductions]

Dude, this tutorial... I spent a total of about 10 hours doing a bunch of different, very long tutorials, and none of them gave me what you did. A working state machine. You're the best! You've got my sub.

[@kyleme9697]

This video has a lot of value because it shows the whole thing with just the bare minimum, and still gets the point across quickly and clearly. Really well done.

[@SebastianGraves]

Glad you enjoyed it pal!

[@niklashognabba5295]

I would totally watch the A.I states videos!

[@MyRapper34]

I watched a few videos to learn State Machine but the ones I watched were very difficult and complex but this video was probably the simplest explanation and I definitely understood the logic. Thank you so much!

[@gelistiriciningozunden]

Aynısı banada oldu çağlar bu adamı izleyince olayı cidden anladım insanlar ne kadar karmaşık anlatıyormuş meğer.

[@MyRapper34]

@@gelistiriciningozunden kesinlikle😆

[@thaiannguyen4820]

i feel so. I totally the best one for beginner

[@EdMechGames]

I really love your delivery. It is pretty perfect for intermediate coders like me. You don't waste a ton of time with the absolute basics but you slow down enough to explain less common situations. Its pretty tough to find videos that don't lean toward either beginners or experts. Super bummed you discontinued the Dark Souls series though. I was really looking forward to taking a shot at that once complete

[@SebastianGraves]

Strongly recommend the Elden series. It's just the dark souls series but better and much more clean and organized.

[@EdMechGames]

@@SebastianGraves I have definitely had my eye on that. I was waiting for it to come along a little further before I jump in but I will certainly give it a shot after my couple of current projects are out of the way. So much goes in to an ARPG so its a big job. Big props for tackling it. On a side not, I notice your first few videos are OSRS. Have you ever considered making an old school runescape clone? It is something I have thought about for a while but always get hung up on how to make player-like bots since I would want to make it playable in singleplayer as well

[@Aaron-vn5fd]

My dude I have been watching 40-60 minute tutorials over the course of a week and you made me understand in less than10 minutes what kind of witch craft is this

[@tomascampo2283]

Hey Sebastian, lots of thanks for your tutorials. I abandoned the elden ring series becouse i was a beginner and couldn't handle the network (I think it had to do something with updates) , so i followed your tutorials on third person basic locomotion and i learned all i needed to fill my needs, I hope to be able to do this again with this tutorial. Thanks again for your work, and I will "show off" on the discord server my work when it's done so you get to see how much you helped. Keep this work and I hope you are doing well, and please, remember that this simple tutorials are really usefull to a lot of people.

[@BluesInSeattle]

Good job dude. I've had to write state machines a few times, and this is probably the easiest walk through that you can give people. By walking through the code as you write it, light bulbs turn on for people.

[@_SF_Media]

The more quality videos you and others put out the better the indie game industry will be. Keep it up.

[@AvianFluu]

Fantastic tutorial. I have been trying to setup a state machine for a few days now and your video was the only one that made it clear how to actually create and change the states.

[@Bitulescu]

Thank you very much. No really thanks a lot, I understood state machines thanks to you. I looked at a bunch of videos with a lot of explaining and a lot of code and I wasn't learning anything really. But you giving a very hands on approach really made me understand. subscribed :D

[@SebastianGraves]

Real happy I could help dude!

[@RGHdrizzle]

I used a very messed up way of making a state machine, yes switch statements lol. This way of implementing state machine actually made my npcs easier to code and debug. Great tutorial.

[@nirabhradas6375]

Yes yes yes yes yes yes Pleeeeeaaaasssseeeee. This is soooooo much easier to understand than some other tutorials I have watched. Thank you sooooo much for making this

[@Hemoplaguer]

@5:29 You said to comment if I want you to make a video showing how to code the actual logic for the states, and I certainly would! Thank you!

[@ianfarrell1182]

One of the best tutorials I've ever seen.

[@ConcreteAge]

Was struggling with this subject for nearly 2 weeks. I have watched a lot of tutorials and found this one as the most simple and clear. Still have some questions but I will check other videos related to this subject on your chanel. Thank you very much for the video!

[@MrSirFluffy]

Way better than the enum and switch case method. The seems cleaner, easier to manage, and more robust. Abstract classes are underrated.

[@zero-fn9vh]

The way you doing it is simple and straight forward...more please😋

[@friendlyhello]

I also would love to see this as its own series, please :) Great video, thank you!

[@ikemuoma8495]

Very basic and clear. A video outlining the individual state logic would be much appreciated. Good work. 👍

[@sKryly1]

Thank you, finally something quick and simple!

[@halivudestevez2]

This is an advanced implementation, I'm happy to find it!

[@archmagesalamar1377]

I would like to see the new state videos. Thanks

[@DavidZobristGames]

finally a clean Ai solution (after all that enum or/and nested if solutions), thanks

[@DavidZobristGames]

I just implemented your solution works fine. But I keep thinking maybe it would be better to have the states as scriptable objects, beeing a single instance of a behaviour which all AI's use instead of having all states on each AI agent again. But than I would need to pass over context / parameters from the statemachine in the update loop to the currently running state while having a monobehaviour enables the context to be in the script / instance on the gameobject. I am not sure if passing over context from the state machine in the update loop is a bad thing? But overall the scriptable object solution would result in less instances and less overhead I think... What do you think?

[@DavidZobristGames]

Too create a useable derived type like chase, idle and attack we actually would need to create a single instance of a scriptable object and reference them to each other as required.

[@wiredcresp6501]

I'm currently making a game with some friends more of these A. I videos would help a lot

[@teratoma.]

dude u literally posted this on my birthday ty luv u

[@orb1t2023]

I don't get an error when I delete the update and start method so I can't right-click and implement the abstract class.

[@christopherwilliams3293]

Please tell me that I'm wrong, but Unity doesn't support null conditionals. The code will compile and stuff, but it will blow up, if the previous object is null. Your state class inherits from Monobehaviour class, which is why I believe that null conditional wouldn't work as expected.

[@joaquinillo_]

It took me a couple watches and some time to sink in the new knowledge about abstract classes and oop in general but I finally get it lol

[@BadBanana]

Fantastic. Been annoyed with my Ai logic walking on the spot when switching states and bools, Think this will fix those annoying timeframe pauses

[@MetalHeadGuitarLessons]

please help i got this message after i was done and i wrote down everything perfectly in the video this is the message i got "can't add script component 'idle state' because the script class cannot be found. make sure that Make sure that there are no compile errors and that the file name and class name match"

[@lostandfound2893]

Dude you're a legend for this video. Thanks so much.

[@SebastianGraves]

Happy to help man.

[@dafe1115]

Hi I have tried adding a game object which is a player to enable logic but it doesn't work

[@mark63424able]

How could this model be extended to make a hierarchical state machine?

[@Wabbaxt]

best tutorial ever thx

[@CowboyCoder21]

I would love to see a more in depth AI tutorial.

[@niklashognabba5295]

How would an FixedUpdate work inside this state machine. I am currently using this statemachine in a school project, so thx for this video so far. I guess a fixed update function would be added to the StateManager script somehow. BTW im a noob programmer.

[@gnat97]

still learning, but just wondering, why would you not just create an enum in StateManager that has idle, chasing, and attacking as its values and alter the value of that enum to reflect the current state?

[@Krishna-bz5iz]

it helps a lot, thank you😃

[@Thurtwings]

Nice one as always!

[@mikekyne1174]

Hi! How can I move next from attack state to the idle one?

[@Wabbaxt]

can you do a video on each of the states pls

[@faded87]

Does this work with multiplayer photon? I don’t want to spend 3 hours making something that won’t work for my game you know

[@Anthracite_coal]

thank you for this! I also like the little stuff you pointed out and explained since I'm still learning C#. Would using coroutines in the logic be a good idea?

[@SebastianGraves]

There's an infinite amount of ways to do the same thing in programming my friend. My advice to you, do not be afraid to mess about and try things out for yourself :^)

[@Anthracite_coal]

@@SebastianGraves Thanks! My mindset with programming is still pretty limited but I'm getting there

[@foncode101]

Seb, are you going to do a video on how to code the states?

[@SebastianGraves]

The Elden ring series has a large a.i portion that uses this state machine system!

[@foncode101]

@@SebastianGraves oh , thank you good sir!

[@wickedpichu571]

Thank you so much ❤

[@christiandaa]

I really want to follow along with your Dark Souls tutorials. Still learning the basics of Unity and this should help with an enemy I am working on. Keep up the good work.

[@TrySomeCG]

will it work in unity 2018.4 and lower?

[@AyushKumar-f5b]

man, what is the font you are using in visual studio?

[@StalinMouStache]

great video really easy to follow but for some reason I can't reference state from other scripts, does anyone know the solution to this?

[@GymCritical]

Calmly making an offering to the KZbin Algorithm Gods 🙌

[@carlbanfield8906]

bookmarked definitely

[@Nebulaoblivion]

nice and concise. thank you!

[@AMGamez20000]

Could you make a video adding stuff into the states preferably in one video because i looked at your dark souls series and it confused me when it came to the ai im making a stealth game so i wouldn't need the dark souls specific stuff

[@WTGDarksight]

Hi! I was wondering how I would go about making a timer within a state. For example in the idle state I want to have it pause for a certain amount of time before continuing. How would I go about this?

[@arkhangelgeos120]

I understand that its been 2 years but can someone help me? I did all like in the video but get this error ": error CS0029: Cannot implicitly convert type 'ChaseState' to 'State' "

[@christiancaputoGDev]

Is this state machine model useful for main character states or actions?? Like Idle, walk, jump...

[@DigitalcommerceChannel]

very well explained, thank you!!!!

[@NimrodGoldberger]

If I want different variations of the enemy to have different StateManagers then I need to start with an abstract StateManager and then implement one for each variation? Or is it better to have multiple states? for example if both are in idle state but variationA runs away when I get close and variationB comes to attack me instead. Do I need to have idleA and idleB or is there another way (like using an overridden method that return the next state for each enemyType?) ? PS. very veeeery good video, explains state machine implementation very well

[@CodemasterJamal]

This was a really good tutorial. I think I might implement this design into my game a bit. I like it a lot. I'm just building a multiplayer game so, the real issue is being able to send the data over the wifi and hoping it comes out correctly.

[@李邦国]

Really helpful! Thank you

[@AllySzat]

This kind of state machine is good for player states aswell?

[@lvulcanis]

yes, I think player controllers must do this, 'cause it's easier to add functionalities.

[@kalpolproductions8558]

Add this to your tps controller playlist it gets trouble finding it

[@codybennett6463]

"The type or namespace name 'State' could not be found". This shows up for all 3 scripts. Among other errors, " 'AttackState.RunCurrentState()' : no suitable method found to override". I get this for idlestate and chasestate too.

[@Exclusifs]

What if I want to use both Update and FixedUpdate in some states? RunStateMachine() is only being called in Update. Thanks for a great tutorial :)

[@chamikadeshan918]

I did it Exactly as you described..But I can't get my State machine to work...There are no errors, but when I tick the boxes the states are not changing. HELP Please!!

[@mythran1162]

Hear hear! Bring 'em on please!

[@LuRybz]

What would happen if the states were created as scriptableObjects and multiple characters use the state? I am curiouss if instead of creating multiple child in the hierarchy we use SOs. Forr many years I've neve seen someone simplify FSMs in less than 10 minutes so clearly. Every time I tried to implement a FSM it would take me hours or even multiple days to achieve the same result. You did a really great job in this video.

[@ConcreteAge]

I have a question: Where would you put NavMesh? Will you have to use it in every state individualy? Or you can just announce it in StateMachine class and make it public so it can share it with other classes (idle, chase, attack etc)? Thank you

[@BenVanTreese]

What I typically do is have the state machine itself pass itself to the states, or have some other class that represents the "agent/context" for the states that you then pass in. So for example, if instead of just state machine, you call it NpcStateMachine, you can add variables to it like the nav agent, and pass itself to the execution (RunCurrentState function) of each state.

[@Jackhowe97]

I noticed when I tick then untick 'isInAttackRange' the enemy stays in the attack state and doesn't return to the chase state, same goes when I tick then untick 'isInChaseRange' he doesn't return to Idle once I untick. Will this change once I add the logic to the state scripts or have I missed something

[@RealPancakes3]

hey so i found this video to help me a ton i was wondering if you ever did make another video dedicated to the actual enemy ai like movement ect and if you didnt can someone let me know which videos forn the dark souls one cover it i can only find part 1 to the dark souls videos

[@SebastianGraves]

Check out my Elden Ring series, specifically the A.I portion. :^)

[@RealPancakes3]

@@SebastianGraves would you ever consider making a ai series for 2d games because my game is 2d and im not sure if it would still work?

[@austinwhiteted8231]

So it maybe is a stupid question but where do I put my logic at? Like in the state itself or not. Just wondering bc I'm not at my PC rn and I see the state doesn't have MonoBehavior

[@doubledeuce95]

I think you would replace the “return this” with the logic of the state itself. Also since the State class inherits from Mono, any class that inherits the State class will also inherits from Mono.

[@federicorenkine4340]

Once you are on your last State, how do you switch back to de first State?

[@foncode101]

you can add an attackRange then if not in attackRange go to next state, idle, or pause, then idle or chase

[@malikvalley]

Two states at the same time?

[@dingFAching]

Hail the algorithm gods.

[@eliudgnzlz8213]

hi bro, maybe you didn't read my message, but I was watching this video and I found it very interesting, then I went to the dark sould one and I didn't understand it well, I guess you are now very busy with the series you are doing, but if at some point you get it complete this miniseries, it would be great.

[@bentom945]

More AI, I will wait

[@Squilliamy]

More AI videos please, love your videos

[@McNottagoose]

Gracias amigo, for the algogods

[@ILIKEPC]

I have already tried this but failed many times cause i dont understand it but after watching this i understood all

[@eodico]

Why not use the animator?

[@ducas_]

cellbit?

[@ashb899]

It's funny I did this exact thing today before watching this

[@raztaz826]

Nice and short

[@fortnitekiddy1315]

I would love to see a clean detailed video! :)

[@monkeyrobotsinc.9875]

well, no point in redoing videos, but if the content is different or better, sure. id watch it.

[@mylogic156]

ur a god

[@darkdoom907]

script needs to derive from monobehaviour to attach

[@shrinjoy1352]

that was fucking cleaver af

[@tazman8487]

Hey SG, Hoping you can help me. I'm making an RTS so have both player and AI. I have setup this state machine for the Units which works fine for the AI but I'm not sure how to switch states for my Player Units. I have a Player controller script and the Units have the State Manager script on them but I'm not sure how to tell the Unit to switch states.. For example I can select the unit and I have added a MoveToState but I can't figure out how to tell the Unit to switch to this state?

[@tazman8487]

I did get it working by using: private State state; ..... state = unit.GetComponentInChildren(); unit.currentState = state?.Tick(movePos);

[@superbarrioland]

Super!

[@LeveledRogue]

7:20 yes please

[@shrekshrek7623]

your telling me, i just coded all that, just so that the ai attacks MANUALLY, OR DOES IT ATTACK WHEN I ADD NAV MESH AND AI TO IT

[@tolgaymert8886]

LifeSaver❤️

[@francescocroce9468]

These are the scripts: State.cs: using System.Collections; using System.Collections.Generic; using UnityEngine; public abstract class State : MonoBehaviour { public abstract State RunCurrentState(); } State Manager.cs: using System.Collections; using System.Collections.Generic; using UnityEngine; public class StateManager : MonoBehaviour { public State currentState; void Update() { RunStateMachine(); } private void RunStateMachine() { State nextState = currentState?.RunCurrentState(); if (nextState != null) { SwitchToTheNextState(nextState); } } private void SwitchToTheNextState(State nextState) { currentState = nextState; } } IdleState.cs: using System.Collections; using System.Collections.Generic; using UnityEngine; public class IdleState : State { public ChaseState chaseState; public bool canSeeThePlayer; public override State RunCurrentState() { if (canSeeThePlayer) { return chaseState; } else { return this; } } } ChaseState.cs: using System.Collections; using System.Collections.Generic; using UnityEngine; public class ChaseState : State { public AttackState attackState; public bool isInAttackRange; public override State RunCurrentState() { if (isInAttackRange) { return attackState; } else { return this; } } } AttackState.cs: using System.Collections; using System.Collections.Generic; using UnityEngine; public class AttackState : State { public bool Attaccato; public override State RunCurrentState() { Attaccato = true; return this; } }

[@6Abdellah9]

plssss make ittttt plsssssssssss

[@ATMLVE]

The word State has now lost all meaning

[@Melon-p6e]

didnt work

[@monkeyrobotsinc.9875]

.75 speed x 10 views = i almost got it;