How is Jolt with networked games?

[ValorZard]

I'm curious if anyone has tested Jolt with online multiplayer games. Most of the examples I've seen using Jolt involve single-player games like Horizon Forbidden West, and I'm curious if Jolt has been battle-tested with online multiplayer. Are there any special design considerations to keep in mind when using it for multiplayer? Any footguns to avoid?

[jrouwe]

I saw this X post the other day:

https://x.com/themirrorgdp/status/1718019599361323023?s=20

And I think X4 Foundations, which uses Jolt, also supports some form of multiplayer.

Several people have been asking questions relating to online projects:

#611
#632

There are also some tips in the documentation, see section Rolling Back a Simulation and the section preceding it.

[Kluskey]

Ahoy! Yes we're using Jolt for The Mirror. Much appreciated for the awesome work with Jolt @jrouwe!

Over time, we'll be exposing a ton of functionality to developers on our platform so you'll be able to a get a "feel" for networked Jolt if you'd like to try it out. Our next release (with Jolt) is coming this month, although it's still an alpha version: https://themirror.space

Considerations: It's definitely been a heavy technical lift; we planned for 1-2 months and we're at ~6 months now for the full implementation. Strong prior knowledge of networking and physics is needed.

[jrouwe]

Thank you for using it! It's fun to see that there is so much interest in Jolt. I'll add The Mirror to the list of projects using Jolt!

[TIHan]

I only dabble in game development on the side, but I did get Jolt to work well with rollback and corrections under a high amount of simulated lag. For the rollback, I'm not using Jolt's built-in Save/Restore state functions, I'm doing it manually with SetPositionRotationAndVelocity and CharacterVirtual's ExtendedUpdate - it doesn't need to be 100% perfect determinism as the corrections fix any inconsistencies, just enough where the player wouldn't notice.

Really cool project @Kluskey and glad to see you all got it working!