⚠️ Beta State

PyBevy is in an early and experimental stage. The API is incomplete, subject to breaking changes without notice, and you should expect bugs. Many features are still under development.

Without Winit

Run a headless PyBevy app without a window.

Introduction

For server-side logic, testing, or CLI tools, you may want to run PyBevy without a window. Disable the WinitPlugin to skip window creation.

from pybevy.prelude import *
from pybevy.winit import WinitPlugin

Headless Setup

Use DefaultPlugins().build().disable(WinitPlugin) to get all default functionality except the window system.

def setup(commands: Commands) -> None:
    print("Running headless!")
    commands.spawn(Camera3d())
 
@entrypoint
def main(app: App) -> App:
    return (
        app
        .add_plugins(DefaultPlugins().build().disable(WinitPlugin))
        .add_systems(Startup, setup)
    )
 
if __name__ == "__main__":
    main().run()

Running this example

Use PyBevy's hot reload feature to run and develop this example. If you don't have PyBevy installed, check out the Quick Start guide.

$pybevy watch without_winit.py

The code will reload automatically when you make changes to the file.

From Python to Rust

Notice how the core concepts in the code—Commands, Assets, App, and Systems—are identical to the original Bevy example?

This is the power of pybevy! It lets you learn Bevy's powerful, data-driven architecture in friendly Python.

When your project grows and you're ready for maximum, native performance, you'll already know the concepts to start writing systems in Bevy Engine with Rust.