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.
Transparency 2D
Display overlapping sprites with different transparency levels.
Introduction
Control sprite transparency using the alpha channel of Color.srgba(). Three logos overlap with decreasing opacity to demonstrate the effect.
from pybevy.prelude import *Setup
Spawn three sprites at different X positions. The first is fully opaque, the second has 70% opacity with a blue tint, and the third has 30% opacity with a green tint.
def setup(commands: Commands, asset_server: AssetServer) -> None:
commands.spawn(Camera2d())
image = asset_server.load_image("branding/icon.png")
# Fully opaque
commands.spawn(Sprite.from_image(image), Transform.from_xyz(-100.0, 0.0, 0.0))
# Blue tint, 70% opacity
commands.spawn(
Sprite(image=image, color=Color.srgba(0.0, 0.0, 1.0, 0.7)),
Transform.from_xyz(0.0, 0.0, 0.1),
)
# Green tint, 30% opacity
commands.spawn(
Sprite(image=image, color=Color.srgba(0.0, 1.0, 0.0, 0.3)),
Transform.from_xyz(100.0, 0.0, 0.2),
)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.