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Behaviour Trees: The Cornerstone of Modern Game AI | AI 101

admin by admin
June 12, 2020
in Game
38
Behaviour Trees: The Cornerstone of Modern Game AI | AI 101

As the new series of AI 101 continues I take a look at behaviour trees – arguably the dominant AI technique in AAA games – and tell you how they work.

If you’re interested in learning more about behaviour trees here are some links to some resources you might find useful:

Chris Simpson: “Behaviour Trees for AI – How They Work”

Alex Champandard: “Understanding Behaviour Trees”

Epic Games: “Behaviour Tree (Unreal Engine 4 Documentation)”

—

AI and Games is series on research and applications of Artifical Intelligence in video games. It’s is supported through and wouldn’t be possible wthout the wonderful people who support it on Patreon.

Get yourself an AI and Games t-shirt over on Teespring!

You can follow AI and Games (and me) on Facebook, Twitter and Instagram:

—

Games in this episode (in order of appearance):

Halo 2
Far Cry Primal
Tom Clancy’s The Division
Halo 3
Spec Ops: The Line
Ghost Recon: Wildlands
Batman: Arkham Asylum
F.E.A.R.
DOOM
BioShock: Infinite
Alien: Isolation

—

Soundtrack for this episode is “Twilight Metropolis A” and “This is My City” by TeknoAxe under the terms of a Creative Commons 4.0 license.

#gamedev #ArtificialIntelligence #BehaviourTrees

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Comments 38

  1. AI and Games says:
    2 years ago

    AI 101 is back for 2019 with a new episode dedicated to Behaviour Trees: one of the most commonly adopted AI technologies in modern video game development. Long-term viewers of the show will have noticed how frequently Behaviour Trees have appeared – with them cropping up in Spec Ops: The Line, Far Cry, Halo and The Division last year alone. So let's take a moment to explain how they work and why developers and designers like to use them.

    Reply
  2. Joanna Parungao says:
    2 years ago

    best thing ever. thank you for this!

    Reply
  3. Patttiat 2000 says:
    2 years ago

    4 min only explaining how to read this tree???!!!
    do you think that i´m stupid???

    Reply
  4. Tabea Tamm says:
    2 years ago

    I think your videos can be very informative, but I usually find myself not knowing what the hell you were talking about in the end because it is way too technical for me.

    Reply
  5. AlphaWoIF says:
    2 years ago

    Excellent Video

    Reply
  6. Sanchay Joshi says:
    2 years ago

    Summarising: Selector is a question (is this condition satisfied) and sequence is a procedure( do this and that)……. AI is basically questions and procedures.

    Reply
  7. MrJaaaaake says:
    2 years ago

    Can you explain why the AI in most video games is so bad when we've had such big improvements in every other area?

    Reply
  8. Aaron Van Meter says:
    2 years ago

    this is a terrible idea!! why would this be the most popular method right now??

    Reply
  9. Arcade Assassin says:
    2 years ago

    behavior trees could be good for a story driven game. because assuming each character has their own tree they could be programmed to behave in a fashion that is far more consistent with their character for example in a shooter game if a character needs reviving an character who doesn't know them very well will only attempt to revive them if their near by but someone who they are close friends with would immediately drop what they are doing and go out of their way to revive them.

    Reply
  10. Nathanael Gazzard says:
    2 years ago

    As an aspiring game developer, there are moments when I feel particularly excited and motivated to make games. For example, every time I listen to the silent hill 2 soundtrack. In this instance, it's new insights and knowledge from you that is driving that inspiration. Thanks Tommy😊

    Reply
  11. Death Strike Gaming says:
    2 years ago

    You basically explained a simple AI neuron

    Reply
  12. pere moya serra says:
    2 years ago

    One thing I didn't get the 4:11 caching thing . I am making a game where the enemy_director tells each instance of a particular enemy what to do each frame using a (small)behaviour tree. The thing is taht I am traversing the tree and making the pertinent checks every frame; how can I store data about the state in wich it was and still check wether it shoud choose an other path?

    Reply
  13. Undisclosed Music says:
    2 years ago

    Do they learn on the fly? Like you would train a decision tree algorithm using some optimization technique? Also, is there a concept of a "forest" of behaviour trees, like a random forest in decision trees?

    Reply
  14. phobos2077 says:
    2 years ago

    Nothing stopping you from using the same event-driven optimizations in state-driven system. So the whole "performance" argument is kinda wrong. The same about reusability – nothing stops from writing states and transitions in an isolated, reusable fashion. You are comparing the bare bones state machines with real optimized implementations of BT's which is just incorrect.

    Reply
  15. Blorp says:
    2 years ago

    Super helpful video. Thanks!!

    Reply
  16. FarEast Armadildo says:
    2 years ago

    Since using Behavior Trees depends on the type of game and its scale, what is recommended to use in a simple tactical rpg? I have made a finite state machine but I think it's lacking and the code will get really complicated if I get into this, so are behaviour trees more appropriate?

    Reply
  17. Thomas Nied says:
    2 years ago

    How's about the Director from the Left 4 Dead series?

    Reply
  18. 420MonkyTime says:
    2 years ago

    He held my lecture today!

    Reply
  19. dmdz says:
    2 years ago

    Fix your playlist order before it's too late!

    Reply
  20. CommieG says:
    2 years ago

    Damn, this channel is so underrated

    Reply
  21. Aaron Van Meter says:
    2 years ago

    behavior trees are a narrativist abomination lmfao

    Reply
  22. Forien says:
    2 years ago

    can you fkin learn to link videos you mention? doesn't help with watching u

    Reply
  23. Van Ivanov says:
    2 years ago

    I wish the graphs were more details, giving examples of the topics discussed.

    Reply
  24. Akemi Homura says:
    2 years ago

    AIs are quite fascinating. without them we wouldn't have video games. i'm grateful for all the talented people through the years which have been responsible for creating such wonderful things.

    Reply
  25. Xav Dest says:
    2 years ago

    The root can also be a selector. It doesn't have to be Root->selector, it can be root(selector) where the root is an event in the world that has a selector inside it.

    Reply
  26. vincentpol says:
    2 years ago

    I may be focusing on the wrong issue here, but wouldn't it make more sense to say Behavior Trees are the 'powerhouse' of modern game AI. Clearly the 'cornerstone' of modern game AI is the state machine, which is used to build said powerhouse.

    I can already sense I'm giving this way more thought that I should. Great video as always.

    Reply
  27. Pedro Paternostro says:
    2 years ago

    This is monumental work, thank you for crafting these videos with so much care. The only issue in my opinion was in the comparison between the methods, you gave behaviour trees and FSMs so much attention but almost forgot GOAP :c

    Reply
  28. Ye4rZero says:
    2 years ago

    What an awesome unique channel! +1 sub

    Reply
  29. Piotr R says:
    2 years ago

    pointless, it is still a FSM just not all transitions are explicitly coded. Easier to debug? surely.

    Reply
  30. Perkkie says:
    2 years ago

    You have way too low sub count. This channel needs more spotlight. Great job mate.

    Reply
  31. Vaaz Rodríguez says:
    2 years ago

    Not again dyslexia… I was expecting to see different trees in games…

    Reply
  32. Stephan Ennen says:
    2 years ago

    Thank you for this video! If I had spare money I'd give you some patreon cash. :/

    Reply
  33. fireaza says:
    2 years ago

    "Where it decides which child to execute based on some logic in the world"
    Man, this video got dark .

    Reply
  34. IW_LEGENDARY_SAYaiN22 says:
    2 years ago

    @ 1:19 the background marine says “They killed the Chief! You bastards!”

    That’s gotta be a south park reference.

    Reply
  35. Kinos141 says:
    2 years ago

    This is great and you are right about UE4 and it's Behavior Trees.
    I used them for nearly all my games.

    Reply
  36. PSHYCO says:
    2 years ago

    Sabonner

    Reply
  37. Sebastian Alvarez says:
    2 years ago

    Not sure if it was explained but I wpuld like to kown how the AI aims to your bodypart in fps games.

    Reply
  38. Juppe says:
    2 years ago

    First dislike :^)

    Reply

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