⚠️ 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.

Lighting

Demonstrates different light types: point, directional, and spot lights.

Introduction

Lighting is essential for 3D scenes. PyBevy supports point lights (emit from a single point), directional lights (sunlight), and ambient light.

from pybevy.prelude import *
from math import pi

Setup

Create a scene with a ground plane, some objects, and multiple light sources to see how they interact.

def setup(
    commands: Commands,
    meshes: ResMut[Assets[Mesh]],
    materials: ResMut[Assets[StandardMaterial]],
) -> None:
    # Ground
    commands.spawn(
        Mesh3d(meshes.add(Circle(4.0))),
        MeshMaterial3d(materials.add(Color.WHITE)),
        Transform.from_rotation(Quat.from_rotation_x(-pi / 2.0)),
    )
 
    # Cubes
    cube_mesh = meshes.add(Cuboid.from_length(1.0))
    for x in [-2.0, 0.0, 2.0]:
        commands.spawn(
            Mesh3d(cube_mesh),
            MeshMaterial3d(materials.add(Color.srgb(0.8, 0.7, 0.6))),
            Transform.from_xyz(x, 0.5, 0.0),
        )
 
    # Point light (warm, positioned to one side)
    commands.spawn(
        PointLight(shadows_enabled=True, intensity=2000.0, color=Color.srgb(1.0, 0.8, 0.6)),
        Transform.from_xyz(4.0, 4.0, 2.0),
    )
 
    # Directional light (cool, like moonlight from above)
    commands.spawn(
        DirectionalLight(illuminance=1500.0, color=Color.srgb(0.8, 0.9, 1.0)),
        Transform.IDENTITY.looking_at(Vec3(-1.0, -2.0, -1.0), Vec3.Y),
    )
 
    commands.spawn(Camera3d(), Transform.from_xyz(-3.0, 5.0, 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 lighting.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.

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