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.
Mesh 2D Alpha Mode
Demonstrate different alpha blending modes for 2D meshes.
Introduction
Alpha modes control how transparency is handled during rendering. This example shows semi-transparent 2D meshes overlapping to demonstrate blending.
from pybevy.prelude import *Setup
Create overlapping circles with semi-transparent materials to show alpha blending.
def setup(
commands: Commands,
meshes: ResMut[Assets[Mesh]],
materials: ResMut[Assets[ColorMaterial]],
) -> None:
commands.spawn(Camera2d())
# Semi-transparent red circle
commands.spawn(
Mesh2d(meshes.add(Circle(100.0).mesh().build())),
MeshMaterial2d(materials.add(ColorMaterial(color=Color.srgba(1.0, 0.0, 0.0, 0.5)))),
Transform.from_xyz(-50.0, 0.0, 0.0),
)
# Semi-transparent blue circle (overlapping)
commands.spawn(
Mesh2d(meshes.add(Circle(100.0).mesh().build())),
MeshMaterial2d(materials.add(ColorMaterial(color=Color.srgba(0.0, 0.0, 1.0, 0.5)))),
Transform.from_xyz(50.0, 0.0, 0.1),
)Running the App
@entrypoint
def main(app: App) -> App:
return app.add_plugins(DefaultPlugins).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.
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.