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# LimboAI - Behavior Trees and State Machines for Godot 4
<p align="center">
<img src="doc/images/logo.svg" width="400" alt="LimboAI logo">
</p>
# LimboAI - Behavior Trees & State Machines for Godot 4
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**LimboAI** is an open-source C++ plugin for **Godot Engine 4** providing a combination of
**Behavior Trees** and **State Machines**, which can be used together to create complex AI behaviors.
It comes with a behavior tree editor, built-in documentation, visual debugger, and more!
While it is implemented in C++, it fully supports GDScript for [creating your own tasks](https://limboai.readthedocs.io/en/latest/getting-started/custom-tasks.html) and states.
It comes with a behavior tree editor, built-in documentation, visual debugger, extensive demo project with a tutorial, and more!
While it is implemented in C++, it fully supports GDScript for [creating your own tasks](https://limboai.readthedocs.io/en/latest/getting-started/custom-tasks.html) and [states](https://limboai.readthedocs.io/en/latest/getting-started/hsm.html).
>**🛈 Supported Godot Engine: 4.2**
>**🛈 License**: Use of this source code is governed by an MIT-style license that can be found in the LICENSE file or at https://opensource.org/licenses/MIT.
Behavior Trees are powerful hierarchical structures used to model and control the behavior of agents in a game (e.g., characters, enemies, entities). They are designed to make it easier to create complex and highly modular behaviors for your games. To learn more about behavior trees, check out [Introduction to Behavior Trees](https://limboai.readthedocs.io/en/latest/getting-started/introduction.html).
![Textured screenshot](doc/images/behavior-tree-editor-debugger.png)
Behavior Trees are powerful hierarchical structures used to model and control the behavior of agents in a game (e.g., characters, enemies). They are designed to make it easier to create rich and highly modular behaviors for your games. To learn more about behavior trees, check out [Introduction to Behavior Trees](https://limboai.readthedocs.io/en/latest/getting-started/introduction.html) and our demo project, which includes a tutorial.
## Demonstration
[![Demonstration](https://img.youtube.com/vi/NWaMArUg7mY/0.jpg)](https://www.youtube.com/watch?v=NWaMArUg7mY)
>**🛈 Demo project** lives in the `demo` folder and is available separately in [**Releases**](https://github.com/limbonaut/limboai/releases).
> It includes a tutorial providing an introduction to behavior trees with examples.
## Features
- **Behavior Trees (BT):**
@ -32,11 +40,11 @@ Behavior Trees are powerful hierarchical structures used to model and control th
- Create complex behaviors by combining and nesting tasks in a hierarchy.
- Control execution flow using composite, decorator, and condition tasks.
- [Create custom tasks](https://limboai.readthedocs.io/en/latest/getting-started/custom-tasks.html) by extending core classes: `BTAction`, `BTCondition`, `BTDecorator`, and `BTComposite`.
- Built-in class documentation. Check out the `BehaviorTree` class documentation to get started.
- Built-in class documentation.
- Blackboard: Share data seamlessly between tasks using the `Blackboard`.
- Blackboard plans: Define variables in the BehaviorTree resource and override their values in the BTPlayer node.
- Blackboard scopes: Isolate variable namespaces and enable advanced techniques like sharing data between several agents in a group.
- Blackboard parameters: Export a BB parameter, for which user can provide a value or bind it to a blackboard variable (can be used in custom tasks).
- Blackboard scopes: Prevent name conflicts and enable advanced techniques like [sharing data between several agents](https://limboai.readthedocs.io/en/latest/getting-started/using-blackboard.html#sharing-data-between-several-agents).
- Blackboard parameters: [Export a BB parameter](https://limboai.readthedocs.io/en/latest/getting-started/using-blackboard.html#task-parameters), for which user can provide a value or bind it to a blackboard variable (can be used in custom tasks).
- Editor support: Blackboard plan editor, and inspector property editor for exported string properties ending with "_var".
- Use the `BTSubtree` task to execute a tree from a different resource file, promoting organization and reusability.
- Visual Debugger: Inspect the execution of any BT in a running scene to identify and troubleshoot issues.
@ -47,16 +55,16 @@ Behavior Trees are powerful hierarchical structures used to model and control th
- Extend the `LimboState` class to implement state logic.
- The `LimboHSM` node serves as a state machine that manages `LimboState` instances and transitions.
- `LimboHSM` is a state itself and can be nested within other `LimboHSM` instances.
- Event-based: Transitions are associated with events and are triggered by the state machine when the relevant event is dispatched, allowing for better decoupling of transitions from state logic.
- [Event-based](https://limboai.readthedocs.io/en/latest/getting-started/hsm.html#events-and-transitions): Transitions are associated with events and are triggered by the state machine when the relevant event is dispatched, allowing for better decoupling of transitions from state logic.
- Combine state machines with behavior trees using `BTState` for advanced reactive AI.
- Delegation Option: Using the vanilla `LimboState`, delegate the implementation to your callback functions, making it perfect for rapid prototyping and game jams.
- Delegation Option: Using the vanilla `LimboState`, [delegate the implementation](https://limboai.readthedocs.io/en/latest/getting-started/hsm.html#single-file-state-machine-setup) to your callback functions, making it perfect for rapid prototyping and game jams.
- 🛈 Note: State machine setup and initialization require code; there is no GUI editor.
- **Tested:** Behavior tree tasks and HSM are covered by unit tests.
- **GDExtension:** LimboAI can be [used as extension](https://limboai.readthedocs.io/en/latest/getting-started/gdextension.html). Custom engine builds are not necessary.
- **Demo Project:** Check out our extensive demo project with a tutorial (an introduction to behavior trees with examples)!
- **Demo + Tutorial:** Check out our extensive demo project, which includes a tutorial providing an introduction to behavior trees with examples.
## Getting LimboAI
@ -81,7 +89,11 @@ LimboAI can be used as either a C++ module or as a GDExtension shared library. G
- [Online Documentation](https://limboai.readthedocs.io/en/latest/index.html)
- [Introduction to Behavior Trees](https://limboai.readthedocs.io/en/latest/getting-started/introduction.html)
- [Creating custom tasks in GDScript](https://limboai.readthedocs.io/en/latest/getting-started/custom-tasks.html)
- [Sharing data using Blackboard](https://limboai.readthedocs.io/en/latest/getting-started/using-blackboard.html)
- [Accessing nodes in the scene tree](https://limboai.readthedocs.io/en/latest/getting-started/accessing-nodes.html)
- [State machines](https://limboai.readthedocs.io/en/latest/getting-started/hsm.html)
- [Using GDExtension](https://limboai.readthedocs.io/en/latest/getting-started/gdextension.html)
- [Using LimboAI with C#](https://limboai.readthedocs.io/en/latest/getting-started/c-sharp.html)
- [Class reference](https://limboai.readthedocs.io/en/latest/getting-started/featured-classes.html)
## Contributing
@ -103,8 +115,12 @@ Features and improvements that may be implemented in the future:
- ~~Providing precompiled builds for download.~~ 🗸
- ~~Tests and CI.~~ 🗸
- ~~GDExtension support.~~ 🗸
- ~~Non-trivial demo project.~~ 🗸
- ~~Extensive demo project.~~ 🗸
- Expanding the library of commonly useful tasks.
- Exploring the execution history of behavior trees in the visual debugger.
- Per-project ignore list for tasks that users may want to hide in the task palette.
- GUI editor for state machines.
## License
Use of this source code is governed by an MIT-style license that can be found in the LICENSE file or at https://opensource.org/licenses/MIT.