⚠️ 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.

Bloom 2D

Bloom post-processing effect with glowing 2D sprites and meshes.

Introduction

Bloom makes bright objects glow by blurring and adding light around them. Use colors with values above 1.0 (HDR) to trigger the bloom effect.

from pybevy.prelude import *

Setup

Create a camera with Bloom enabled and several bright objects. Colors like Color.srgb(5.0, 5.0, 5.0) are brighter than normal and will produce visible bloom.

def setup(
    commands: Commands,
    meshes: ResMut[Assets[Mesh]],
    materials: ResMut[Assets[ColorMaterial]],
    asset_server: AssetServer,
) -> None:
    commands.spawn(Camera2d(), Bloom())
 
    # Bright sprite that glows
    sprite = Sprite.from_image(asset_server.load_image("branding/bevy_bird_dark.png"))
    sprite.color = Color.srgb(5.0, 5.0, 5.0)
    sprite.custom_size = (160.0, 160.0)
    commands.spawn(sprite)
 
    # Bright magenta circle
    commands.spawn(
        Mesh2d(meshes.add(Circle(100.0))),
        MeshMaterial2d(materials.add(ColorMaterial(color=Color.srgb(7.5, 0.0, 7.5)))),
        Transform.from_xyz(-200.0, 0.0, 0.0),
    )
 
    # Bright cyan circle
    commands.spawn(
        Mesh2d(meshes.add(Circle(100.0))),
        MeshMaterial2d(materials.add(ColorMaterial(color=Color.srgb(6.25, 9.4, 9.1)))),
        Transform.from_xyz(200.0, 0.0, 0.0),
    )

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.

$pybevy watch bloom_2d.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.

2D Shapes

CPU Draw