Unity Bots with State Machines - Extensible State Machine / FSM

Build bots for your Unity game with a powerful but simple to manage state machine built completely in c#. Learn how to use the state pattern in unity, building an AI to control harvesting bots that could be used for an RTS, building game, shooter, or anything else. We'll dive into transitions, states, ai, bots, and how to hook it all up in a clean easy to use package. This is my best unity state machine tutorial and shows the unity finite state machine I use in real projects every day :)

[martin.m.kloeckener]

0:00 - Intro
1:11 - What is a state machine
2:58 - What we're going to build
3:44 - The scene
5:53 - Code that uses the state machine

7:13 - State machine code: fundamentals
8:26 - State machine code: Tick method
8:59 - State machine code: IState interface
9:21 - State machine code: SetState method
10:04 - State machine code: transitions

15:43 - Implementation example: fundamentals
16:41 - Implementaion example: states
21:57 - Implementation example: transitions
26:56 - Implementation example: more states

34:41 - See it in action
35:37 - Conclusion

[DevilMan]

It's so nice to see an actual C# programmer making Unity videos. Thank you.

[bladescreed]

To this day this is still the only accessible video I've found on Youtube that properly demonstrates a full fledged Finite State Machine that uses many features included in Unity and C# to there fullest potential, so many people are scared of things like reflection, abstraction and this video covers them beautifully! Amazing work as always!

[reendevelops]

It feels amazing to actually understand programming videos. Back when I was starting, I stumbled across these kinds of videos, and me wanting to learn, I stayed and watched. I had a headache from it. But now, I'm finally getting how it works!!! Feels good man, my hardwork has paid off.

Thank you for the amazing video!

[Legionope]

This video is the actual turning point for a lot of gamedevs. Bookmark this one guys.

[kingXkeith]

Was just literally watching your old State Machine Ai video from 2018. This is really helping me with this quarter of school being stuck inside

[longneckgames]

This tutorial was incredibly helpful despite a few hiccups with the from and to being swapped in AT function. I also stumbled upon a way to simplify things a little.
Instead of writing the Func<bool> conditions like this

Func<bool> HasTarget() => () => Target !=null;

You can simply write

bool HasTarget()=> Target !=null;

Then you simply have to remove the "()" from the AT call

AT(search, moveToSelected, HasTarget);

Again, thank you Jason for making such great tutorials

[toddsorensen]

Dude I've literally spent months working on a system for my melee combat game and this implementation of the state machine pattern not only works but is also something I can actually understand and build upon. Thank you so much!

[jumpster]

I've stumbled across this video several times before but was too new to the concepts to understand what you were really trying to illustrate. At last, I've finally grown into them and just wanted to say thanks for the explanations and code. I'll be using this as a base for my own projects. Now to find an abstraction for calling Coroutines...

[MickDarkstar]

This is by far the best solution for implementing a FSM for gamedev in Unity.
Can´t find anything on this level on Udemy, pluralsight or other e-learning platforms. Just pure gold, thx Jason.

Have tried many different approaches, but this is the most clean and reusable solution I´ve seen (as a C# developer). I´m really new to gamedev and glad I found your channel, as you use many professional/standard design patterns for solving things in Unity instead of just making something tick.

[Bardent]

Jason you are a treasure! My state machine system was so close but it was missing something and I was racking my brain trying to figure it out. This helped a TON! Thank you!

[bgildersleeve]

Great tutorial. I love the format, by the way. Lots of people write the code in real time and explain as they go, but I like how you show the finished product right away and then talk through it. It lets me pause the video and read over the full source code to try to understand it on my own before you go through and describe how it works. Very helpful!

[CanalPapaco]

This is my favorite part in programming, discovering these neat abstractions that makes everything easier.

[SendarkWoW]

Another great tutorial - just finished implementing it into my project, and it works like a charm.

[halivudestevez]

For me this video had the most impact. Gives me a lot.

[ukaszciesla]

I'm a Java developer with knowledge of design patterns, but without deep c# practice. So, your videos (from a C# developer's perspective) are awesome. I can learn both C# and unity game design patterns. Thanks a lot and keep going!

[fredericobrink]

Many examples on this topic are too simple to actually give me an idea of what I can solve using the state pattern, thanks a lot for the insight Jason, doing great work!

[Rookx]

Jason before this video: "Look at this class name, Wp instead of Weapon?? Never name things like this, I WLD NT RCMD THS"
Jason after this video: "'At' is a perfectly good way to describe this Add Transaction function. 10/10 WLD RCMD"
:P
Great video, Jason!

[rickloyd]

One of the best finite state machine explanations! I knew about it but I LOVE how you added condition for state change and also list possible transitions! The idea of have transitions which could happen from any state is awesome. That makes code really implementation independent. What I mean, it's not hard coded logic! Thank you

[jamesh]

Just want to extend you my appreciation for all your insightful work <3