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.
Time Delta
Access frame timing with delta seconds and elapsed time.
Introduction
The Time resource provides frame timing information. delta_secs() gives the time since the last frame, elapsed_secs() gives total time since app start. Always multiply movement by delta time for frame-rate independence.
from pybevy.prelude import *Time System
_count = [0]
def print_time(time: Res[Time]) -> None:
_count[0] += 1
if _count[0] % 60 == 0:
print(f"Delta: {time.delta_secs():.4f}s | Elapsed: {time.elapsed_secs():.2f}s")Running the App
@entrypoint
def main(app: App) -> App:
return app.add_plugins(DefaultPlugins).add_systems(Update, print_time)
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.
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.