⚠️ 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.

Spherical Area Lights

Demonstrates point lights with different radii acting as area lights.

Introduction

Point lights in PyBevy can have a radius, simulating area lights. A larger radius creates softer shadows and broader illumination patterns.

from pybevy.prelude import *
from math import pi

Setup

Create several point lights with different radii to compare the lighting effect.

def setup(
    commands: Commands,
    meshes: ResMut[Assets[Mesh]],
    materials: ResMut[Assets[StandardMaterial]],
) -> None:
    commands.spawn(
        Mesh3d(meshes.add(Circle(4.0))),
        MeshMaterial3d(materials.add(Color.WHITE)),
        Transform.from_rotation(Quat.from_rotation_x(-pi / 2.0)),
    )
 
    cube_mesh = meshes.add(Cuboid.from_length(0.5))
    material = materials.add(Color.srgb(0.8, 0.8, 0.8))
 
    for i, radius in enumerate([0.0, 0.1, 0.25, 0.5]):
        x = (i - 1.5) * 2.5
        commands.spawn(Mesh3d(cube_mesh), MeshMaterial3d(material), Transform.from_xyz(x, 0.25, 0.0))
        commands.spawn(
            PointLight(intensity=2000.0, radius=radius, shadows_enabled=True),
            Transform.from_xyz(x, 2.0, 0.0),
        )
 
    commands.spawn(Camera3d(), Transform.from_xyz(0.0, 4.0, 8.0).looking_at(Vec3.ZERO, Vec3.Y))

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 spherical_area_lights.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.

Parenting

Texture