⚠️ 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.

Camera Orbit

Orbit camera around a target point with mouse controls.

Introduction

An orbit camera rotates around a focal point, commonly used in 3D editors and strategy games. This example implements orbit controls using mouse drag for rotation.

from pybevy.prelude import *
from math import pi

Setup

Create a scene with objects to orbit around.

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)),
    )
    commands.spawn(
        Mesh3d(meshes.add(Cuboid.from_length(1.0))),
        MeshMaterial3d(materials.add(Color.srgb_u8(124, 144, 255))),
        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 camera_orbit.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.