Bevy GGRS Rapier Avian example

This is my quest to get GGRS and Avian to work together in the Bevy engine, using the plugins.

Check out the original built on Rapier: https://github.com/cscorley/bevy_ggrs_rapier_example

Is it perfect? No. But is well-written? Also no.

Hopefully this will serve as a crash course to getting your fun weekend project going.

Things I have going

Deterministic physics and rollbacks (allegedly)
Desync detection (via GGRS plugin)
Simulating pausing between rounds (every 10 seconds)
Plenty poorly strung-together comments
And a whole lot of debug learning

Keys

WASD movement
R turn on random movement for this window
T turn off random movement for this window

Running

This demo has no menus other than the debugging inspector. This demo assumes that you will run it twice, which establishes a connection between the two and runs the simulation.

Native

From the root directory:

cargo run

In VS Code, you can also run two of them with (Ctrl|Cmd)+Shift+B, which will run the demo twice.

WASM

From the root directory (requires wasm-server-runner):

cargo run --target wasm32-unknown-unknown --features web

Or, use the wasm.sh script which runs several commands. This will produce an optimized WASM build and launch a test HTTP server (requires wasm-bindgen-cli, binaryen, and simple-http-server).

You will need to launch the demo in two windows. It is recommended to not use tabs to avoid and auto-sleep behavior from your browser.

Testing

You can test rollbacks locally
- On Linux, I use the included slowmode.sh script.
  - Run with root/sudo.
  - Run again to restore.
- On Windows, I use clumsy https://jagt.github.io/clumsy/

Contributing