Whether the physics engine is deterministic or not doesn't matter here -- Revy (and more importantly, Rerun) doesn't replay anything: it just stores state, every single frame, and then visualizes that state at every timestamp available.

Check out e.g. the live demo of the breakout example for example [1]: if you click on the pallet and then go to its parent node, you'll see that we just store that node's final transform (i.e. post-physics) every frame.

Happy gamedev!

[1] https://app.rerun.io/version/0.14.1/index.html?url=https://s...