bevy_gaff is an attempt at making a networked (p2p), cross-platform physics simulation using rollback netcode.
It synchronizes only user input and relies on determinism for the simulation to stay in sync.
It also serves as kind of a showcase/demo of the following rust gamedev crates:
On network delays physics state is predicted ahead of time, assuming other players input will stay the same as the last frame. If conflicting input is received later, an older state is restored, and the physics simulation is replayed using the updated input.
This means the simulation stays responsive, and you will always see the result of your own input immediately regardless of ping to other players.
Input is also sent directly between players (p2p, no intermediate server) even when running on WASM, this means that if the players are located closely, mis-predictions will be rare and the latency barely noticeable.
Install and run matchbox_server
cargo install matchbox_server
matchbox_server...and run two instances of the "game":
cargo runThe example can also be run "single-player":
cargo run -- --players 1Or with any other number of players
- simulation desyncs on rollbacks