⚠️ 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.

Vertex Colors

Display a mesh with per-vertex colors.

Introduction

Vertex colors assign a color to each vertex of a mesh. The GPU interpolates between vertex colors, creating smooth gradients across the surface.

from pybevy.prelude import *
from math import pi

Setup

Create a simple cube with a standard material. Vertex colors would be set directly on the mesh data for per-vertex coloring.

def setup(
    commands: Commands,
    meshes: ResMut[Assets[Mesh]],
    materials: ResMut[Assets[StandardMaterial]],
) -> None:
    commands.spawn(
        Mesh3d(meshes.add(Cuboid.from_length(1.5))),
        MeshMaterial3d(materials.add(Color.WHITE)),
        Transform.from_xyz(0.0, 0.75, 0.0),
    )
 
    commands.spawn(
        Mesh3d(meshes.add(Circle(4.0))),
        MeshMaterial3d(materials.add(Color.srgb(0.3, 0.3, 0.3))),
        Transform.from_rotation(Quat.from_rotation_x(-pi / 2.0)),
    )
 
    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 vertex_colors.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.

Texture

Wireframe