⚠️ 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.

Animated Material

Animate a material's color over time using a system.

Introduction

Materials in PyBevy can be animated by modifying their properties each frame. This example changes the color of a cube's material over time using sine waves.

from pybevy.prelude import *
import math

Setup

Create a cube with a standard material. Store the material handle so we can modify it later.

@component
class AnimatedMaterial(Component):
    handle: Handle = None
 
 
def setup(
    commands: Commands,
    meshes: ResMut[Assets[Mesh]],
    materials: ResMut[Assets[StandardMaterial]],
) -> None:
    mat_handle = materials.add(Color.srgb(0.5, 0.5, 0.5))
    commands.spawn(
        Mesh3d(meshes.add(Cuboid.from_length(1.5))),
        MeshMaterial3d(mat_handle),
        Transform.from_xyz(0.0, 0.5, 0.0),
    )
 
    commands.spawn(PointLight(shadows_enabled=True), Transform.from_xyz(4.0, 8.0, 4.0))
    commands.spawn(Camera3d(), Transform.from_xyz(-3.0, 3.0, 5.0).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 animated_material.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.

3D Shapes

Load glTF