Question How do I get same physics result?

I think new Physics is determind which I need the cross platform same physic result, so I try to convert my project to ECS and use new physic system. And I convert my demo scene which contain some boxes droping from air to floor to see if I can get same result by playing twice, turn out I alway get different result.
physics version:1.0.0-pre.44

But when I try in the physics sample download from github, I modify a demoscene with similar set up like in my own project. And I still get different result, (I did get same result once but when I modify the scene to have more boxes it get different result).
physics version:1.0.0-pre.15

So my question is can I get same result cross platform by ECS? And how can I make the physics determind if ECS do support this.

 

Cross-platform determinism with the Burst Compiler (and therefore UnityPhysics) feature is still missing.

Please go to https://unity.com/roadmap/unity-platform/dots and find "Burst Determinism" and mark it as "Critical" with a comment so Unity can see that this feature is highly requested.

 

Both at same machine on windows 10, in the third screenshots it dont have difference, but when I modify the scene more, I got different result almost everytime I replay the game in editor. My Unity version is 2022.2.10f1. But I did found that "Burst Determinism" is not done yet, maybe the feature just did not support yet.

 

Are the cubes created from a sub scene or do you instantiate them at runtime?

if you load them from a sub scene, try instead to instantiate them at runtime (with press of a button and have a reset system that you can repeat the test multiple times) and enable synchronous burst compilation.

if you repeat the test multiple times in the same play mode session does the result still appear non deterministic?

 

My bad, I think it might because I was accidently setting the physics to none instead of unity physics in physics setting(and I disable the whole physics also), I got same result accross editor and different machine right now. I think there might have some differnent in play loader scene open 2b2 than directly play 2b2 scene.Bacause when I play 2b2 scene directly it got different result, but when I use loader scene to open 2b2 scene it got same result.
And I test on my own project again, the build got same result too!
I still got question,
1, How much determinism does Unity Physics offer in the current version? Right now same at windows x64 is good enough for me but it would be great if it can cross-platform.
2, Does Unity Physics have configurable joint alternative script? I want to make a active ragdoll by using the joint drive.

 

Thanks for you explanation, and sure I will make a new post.