Sign in to follow this  
Andrew Blem

Unity How to implement a Behavior tree(prefarably in Unity 3D)

Recommended Posts

I have a state machine I want to implement as a behavior tree. I now have an understanding of how they work but I cant seem to find an implementation of a behavior tree. I have implemented a simple one using a plug-in called Behavior Machine but the problem I have with it is I feel like it limits me just as it did when I used it for making my FSM until i implemented my own. The other problem I have is it is difficult to implement my own nodes and control which part executes(optimization). Any idea on where I can find a good tutorial on how I can do this preferably on Unity and in C# or in java. Or where I can find a good library with proper documentation because the one I found on Github or other sights are buggy or its just some classes with no documentation. Your help will be greatly appreciated.

Share this post


Link to post
Share on other sites

A Tutorial will only give you the down to earth basics of it's implementation (and usually not a very good one). Tell us what's confusing you, what you want to add and we can help you from there. Annd... any behavior tree implementation you look for is either going to be something you buy, or something that's not C# or translates very well.

Share this post


Link to post
Share on other sites

? It's just a tree with nodes for choices and state IDs for leaves. You can certainly implement that in C#.

 

Why are you thinking that this needs to be optimized though? What are you using it for and how deep is the tree?

Share this post


Link to post
Share on other sites

Well when i implemented my FSM i experienced performance issues because some functions where being called ever frame so i had to create another "CustomUpdate"  function that I can control its execution frequency like tell it to execute 10 times every second which increased my performance. Since I want to convert that same FSM to a behavior tree I thought I might experience some performance issue. I want to use it to create an A.I for a soccer game so that I can ask someone to play the game and see if they can see any difference between a team implementing the behavior tree or the FSM. The thing now is I want to implement my own tree and a heads up on how I can do it will be appreciated.

Share this post


Link to post
Share on other sites

 The thing now is I want to implement my own tree and a heads up on how I can do it will be appreciated.

 

Have you seen the talks/slides on this site? They might help.

 

A behavior tree core implementation is actually fairly simple. I mean, I wrote one a while back based on info I learned from the above reference site - I could dig that code up and give it to you - but looking at Behavior Machine in the Unity asset store, it does everything mine did and much more (and appears to plug nicely into Unity). What's wrong with it exactly? How is it limiting you?

 

The hard part is modelling the world and somehow distilling that into nodes in a BT. And you won't find any implementation that does that, because it will be specific to your game. So maybe you're looking for tutorials that help explain how to do that, or concrete examples of complex AI implemented using behavior trees? Let me know if you find any good info on that!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Announcements

  • Forum Statistics

    • Total Topics
      628385
    • Total Posts
      2982391
  • Similar Content

    • By sveta_itseez3D
      itSeez3D, a leading developer of mobile 3d scanning software, announced today a new SDK for its automatic 3D avatar generation technology, Avatar SDK for Unity. The Avatar SDK for Unity is a robust plug-n-play toolset which enables developers and creatives to integrate realistic user-generated 3D avatars into their Unity-based applications. SDK users can allow players to create their own avatars in the application or integrate the SDK into their own production processes for character design and animation.
      “Virtual avatars have recently become increasingly popular, especially in sports games and social VR apps. With the advance of VR and AR, the demand to get humans into the digital world is only increasing”, said Victor Erukhimov, itSeez3D CEO. “Our new Avatar SDK for Unity makes it super-easy to bring the avatar technology into any Unity-based game or VR/AR experience. With the Avatar SDK for Unity now every developer can bring face scanning technology into their games and allow players to create their own personalized in-game avatars, making the gameplay much more exciting and immersive.”
      Key features of the Avatar SDK for Unity:
      Automatic generation of a color 3D face model from a single selfie photo in 5-10 seconds (!). Works best with selfies, but can be used with any portrait photo.
      Shape and texture of the head model are unique for each person, synthesized with a deep learning algorithm crafted by computer vision experts
      Head models support runtime blendshape facial animations (45 different expressions)
      Generated 3D heads include eyes, mouth, and teeth
      Algorithms synthesize 3D meshes in mid-poly resolution, ~12k vertices, and ~24k triangles
      Six predefined hairstyles with hair-recoloring feature (many more available on request)
      Avatar generation API can be used in design-time and in run-time, which means you can allow users to create their own avatars in your game
      Cloud version is cross-platform, and offline version currently works on PCs with 64-bit Windows (support for more platforms is coming soon)
      Well-documented samples showcasing the functionality.
       
      Availability
      The Avatar SDK for Unity is offered in two modes - “Cloud” and “Offline”. The “Cloud” version is available at http://avatarsdk.com/ and the “Offline” version is available by request at support@itseez3d.com.
      ###
      About itSeez3D
      At itSeez3D, we are working on the computer vision technology that turns mobile devices into powerful 3D scanners. itSeez3D has developed the world's first mobile 3D scanning application that allows to create high-resolution photorealistic 3D models of people's' faces, bodies and objects. The application is available for iOS and Windows OS mobile devices powered with 3D cameras. In 2016 the company introduced Avatar SDK that creates a realistic 3D model of a face from a single selfie photo. To learn more about itSeez3D scanning software and 3D avatar creation technology, please visit www.itseez3d.com and www.avatarsdk.com.

      View full story
    • By sveta_itseez3D
      itSeez3D, a leading developer of mobile 3d scanning software, announced today a new SDK for its automatic 3D avatar generation technology, Avatar SDK for Unity. The Avatar SDK for Unity is a robust plug-n-play toolset which enables developers and creatives to integrate realistic user-generated 3D avatars into their Unity-based applications. SDK users can allow players to create their own avatars in the application or integrate the SDK into their own production processes for character design and animation.
      “Virtual avatars have recently become increasingly popular, especially in sports games and social VR apps. With the advance of VR and AR, the demand to get humans into the digital world is only increasing”, said Victor Erukhimov, itSeez3D CEO. “Our new Avatar SDK for Unity makes it super-easy to bring the avatar technology into any Unity-based game or VR/AR experience. With the Avatar SDK for Unity now every developer can bring face scanning technology into their games and allow players to create their own personalized in-game avatars, making the gameplay much more exciting and immersive.”
      Key features of the Avatar SDK for Unity:
      Automatic generation of a color 3D face model from a single selfie photo in 5-10 seconds (!). Works best with selfies, but can be used with any portrait photo.
      Shape and texture of the head model are unique for each person, synthesized with a deep learning algorithm crafted by computer vision experts
      Head models support runtime blendshape facial animations (45 different expressions)
      Generated 3D heads include eyes, mouth, and teeth
      Algorithms synthesize 3D meshes in mid-poly resolution, ~12k vertices, and ~24k triangles
      Six predefined hairstyles with hair-recoloring feature (many more available on request)
      Avatar generation API can be used in design-time and in run-time, which means you can allow users to create their own avatars in your game
      Cloud version is cross-platform, and offline version currently works on PCs with 64-bit Windows (support for more platforms is coming soon)
      Well-documented samples showcasing the functionality.
       
      Availability
      The Avatar SDK for Unity is offered in two modes - “Cloud” and “Offline”. The “Cloud” version is available at http://avatarsdk.com/ and the “Offline” version is available by request at support@itseez3d.com.
      ###
      About itSeez3D
      At itSeez3D, we are working on the computer vision technology that turns mobile devices into powerful 3D scanners. itSeez3D has developed the world's first mobile 3D scanning application that allows to create high-resolution photorealistic 3D models of people's' faces, bodies and objects. The application is available for iOS and Windows OS mobile devices powered with 3D cameras. In 2016 the company introduced Avatar SDK that creates a realistic 3D model of a face from a single selfie photo. To learn more about itSeez3D scanning software and 3D avatar creation technology, please visit www.itseez3d.com and www.avatarsdk.com.
    • By Canislupus54
      I'm looking for programmers for an rpg I want to make. If you're wondering what "semi-turn based" means, it means that you take turns, but instead of a rigid back and forth like Pokemon, a timer determines when you can act, a sort of modernization of the classic Final Fantasy Active Time Battle system. Right now, I'm looking for programmers to create a prototype of both the combat system and the movement outside of combat. Preferably for Unity C#. Concept artists, particularly for characters, and writers to help me flesh out the character and story aspects, would also be helpful.
      Here's a concept doc to fully explain things: https://docs.google.com/document/d/1ObDMAUWsndSAJ1EpQGRDxtR8Xl9xPotx89OZ0sgRaIw/edit?usp=sharing
      If you can fill another role and are interested, feel free to let me know as well.
      At the moment, this is purely a hobby project, with no payment planned. If we produce something we feel we can release, then of course we'll work out something for compensation. But, again, don't join this project counting on payment.
      If you're interested, contact me on here, or at jordestoj@yahoo.com . Thanks.
  • Popular Now