[tikotus]

I was looking for the same thing. There is a replay mechanism, so it seems to be deterministic. But with floating point physics, not across platforms. Though -ffast-math is unsupported according to the documentation, so maybe it is intended to be deterministic across platforms? https://box2d.org/documentation3d/recording.html

EDIT: Clarified meaning about ffast-math

[tikotus]

Ah, found more: https://box2d.org/documentation3d/md_simulation.html#autotoc... "Box3D is designed to be deterministic across thread counts and platforms."

This is absolutely fantastic!