Hi everyone! Happy Sunday! Make sure to hit the 👍 and the 🔔 if you don't want to miss next week's video that will continue this topic into Blackboard Architecture! Hope you like it! Also, check out the little bash script I included in the repo. If you are like me, and you use CTRL-ALT-A to stage your files in your IDE, it doesn't include the meta files, which you might want to include. The `stageMeta` script will find all the missing meta files and stage them for you.

This is just another banger to be frank. You broke it down so simply I was able to grasp the concepts quickly and create my own behaviour tree with different functionality! Legend.

Dude.. I don't know how you don't have more subscribers. I used to do basic gamedev back in the late '90's/00's and have tried to get back into it in the last couple years (off and on) without writing my own openGL based engine again. It's refreshing to find tutorials that not aimed at absolute beginners. I've been programming professionally for 20 years -- I just want help with structure/systems/engine specifics. This is great.

This channel is a pure gem. I am really impressed that you manage to put out these quality videos on a weekly basis.

Your Unity-C# tutorials are among the best on KZfaq and you deserve much higher viewership. It's so hard to find scripting tutorials any more advanced than a basic introduction to design patterns, or aren't overly niche... And yet you write truly practical, useful, and properly structured code with a high production value, and you pump these things out like a beast! We must protect this man at all costs! Quick question although this may have been answered in a previous video: where did you get that editor script for drag-ang-drop arrays? Did you make it yourself or is it an asset?

Great stuff, as always! For those interested, there are ways to migrate the logic into a UI grid with nodes and links through UI Toolkit. You can even throw a mini-map in the lot. It's quite nice. The final product is far more scalable and readable than code only. It also allows compartmentalization of blocs of logic to reuse them in other trees and more! Level up your complex systems with visuals that boosts productivity 😀.

Nice video! it just popped on my home page exactly when i was going to code my AI and now i will implement it with this pattern! im pretty sure your channel will grow even more than brackeys.

Thanks! This is exactly what I was looking for.

I haven't watched the full video yet, but I have spent the last week looking for the best implementation for a simple AI for my card game. It is almost like a sign from the Universe. You always have the perfect video. Can't wait to learn and implement this

I've watched all of your videos but this is my first time commenting! I really love your style and approach. This channel has become my favorite channel in the game dev space on KZfaq. I've used Unity for around 5 years and my current live service game is a Unity game. However, the past year or so I have transitioned to Godot for a variety of reasons. Using your approaches and methodologies to help me with better architecting systems in a new engine such as Godot has been a blast! All of the knowledge you expel is so easily transferable. I really appreciate all you do and I hope you continue making videos like these for the foreseeable future.

I love It. it was what I needed the most. Thank you very much.

Excellent video! I am using the Fluid Behavior Tree in my current main project. A well.implemented BT makes it so easy to keep track of and debug agent AIs.

You consistently have the best tutorials out there right now. You'll be at 100k subscribes in no time! keep up the great work.

You are doing the best tutorials in known Internet....Keep doing!

Awesome implementation! Looking forward to the blackboard.

Thanks! Awesome as usual!

Another awesome AI video after GOAP, already looking forward to coding along and learning something new!

amazing video yet again!

So great, keep it up!!!

Wow, excellent video! I just finished udemy course about Behaviour Trees and it's seems that your approach is waaay more flexible and understandable. I'm really looking forward to see the next video about blackboard (:

Thanks for this 🙏

An interesting extension for performance could be integrating the BT and/or some nodes with an event-system to handle interruptions & environment changes rather than relying entirely on the entity's class Update method. Alternatively, you could go down the coroutine/task path and use a fixed time-interval to reduce the number of environment/condition evaluations (e.g. every 1/10th of a second rather than at every frame). If you have 100s of NPCs/AIs, or are targeting mobile, this could make a difference.

Awesome video... ❤

god-like tutorial

Nice

Little tip! If your waypoints are too close to each other then agent.pathPending will never be true and your hero will not go to the next waypoint. I think because the calculation will be that quick that the path is ready before we could check it.

Hello, I'm learning a lot from your videos, your explanations are great and the code sometimes seems complex but it's great. Could you make videos based on different project architectures?

I notice that, in selector node, process will start from current child, but in priority selector, process starts from the first child. So we must use priority selector to do some interrupt?

I have noticed that you do the execution of the behaviour tree on the "Update" function. The thing is , if you do a complex strategy , lets say for an fps game where you have to move/check for enemies/check for whatever/do the action. and lets say that you have 50 npcs with that strategy , then your complexity is super huge for the proccessor . What do you recommend in that case ?

Great video as usual, I have a question about the BT and the Goab, how could we integrate the Goab system to pick and create nodes and sequences to archive a goal, so the nodes would be an actions but the action wont be a one class but a combination of nodes, is that has any logic or it's just two deferent soultions for two different problems on the same Ai agent.

Thanks for the video sir. Can you do some video about "Custom Package Publishing" ?

Do you have a video on menu systems yet?

This vid is so useful. Btw, do u know how to make the shader effect for your character when it's concealed by the wall or something else. Thank you!

Probably has been asked a 1000 times before but anyway, which tool do you use to draw your diagrams?

What is the whiteboard app been used here in the intro?

Great guide as always! Where do you seperate logic which is not common? For example, Your character is moving to patrol points with "animation" even if you didnt call it inside Patrol, so do you just call it in another place where you check magnitude etc. I want to make the strategies modular as possible, but there are some typical conditions like animation running, or tweening while moving etc. Should i seperate the logic there, or create another interface to handle that. As far as i see, you seperated the animation logic from the strategies. Or instead of passing, agent, target, speed etc. should i directly pass "Zombie" or smth to the strategy constructors for better usage? I generally find myself setting the logic inside Zombie (live move methods etc.), and in strategies, I am just calling them. I dont know its a good way though. I cant seem to understand how to seperate them, for example there should be a Die Strategy where we implement die methods to call ragdoll etc, or should i simply call zombie.Die(); inside the strategy and actions/events would do the rest like ragdolls etc. So to summarize, writing the logic inside Strategy, or calling it from given class

Noice 👍

Amazing video! One question - how does Behaviour tree compare to StateMachines? Could them be combined, or it's just too excessive?

Hey. I was wondering if UntilFail Node should return Success when the child returns Failure?

When adding nodes, can you just chain them together, like you do for a Builder? So like node.AddChild(child1).AddChild(child2).AddChild(child3);

Thank you very much for the tutorial! I have a little problem. After the final code, the execution logic doesn't continue after the sequence is executed. For example, if the hero got the treasure, then nothing further happens. If he became in a safe position, then after that, he doesn't react to any changes, etc. The code has already checked 10 times, everything is identical to yours (I guess).

Can i let All the nodes action or condition inherit from Leaf directly instead of using IStrategy (of course i will remove this interface, only use Leaf class)?. And how to integrate blackboard to behavior tree?. That's all my wondering, im so gratefull if you have time to answer me. Thank you!!!

Whats the benefits of implementing such a state management with strategy pattern instead of using standart abstraction of state machine

But what if I just put this in a big if statement?

Amazing stuff! Quick question.... What do you use to make graphs like at 1:20? It seems very useful.

Loving your videos. If it's not too much to ask, would you keep your code structured in a way that the same code can be easily replicated in other tools or engines too? As a seasoned dev I can port your code to my monogame or even godot, but for those who are just learning using other engines, it could be harder.

At first glance BahviorTree node and Sequence node look both the same...