Rocket League integrated Bullet Physics in the Unreal engine for deterministic networked physics simulation.

‘Rocket League’ owes a large part of its success to how fun it is to play for people of all ages. But why does the game feel so good? One of Psyonix’s main programmers, Jared Cone, will take session attendees through an inside look at the specific game design decisions and implementation details that made ‘Rocket League’ and its networked physics the success that it is today!

See the GDC slides here: https://www.gdcvault.com/play/1024972/It-IS-Rocket-Science-The