LiquidFun extension?

[Happypig375]

https://github.com/google/liquidfun

Attempt 1 at merging LiquidFun into Box2D was met with

The main Box2D library is open source, but not open contribution. Please do not submit pull requests. Exceptions may be considered for build files and other items that are not part of the main library source. Thank you for your understanding.

Attempt 2 was met with

I would not take this on because I would be responsible for this feature and I would likely do it differently. I recommend to keep it in your fork and make use of it there.

I hope that Box2D.NET would be more open minded than Box2D here.

JBox2D did the port already.

box2d.ts also did the port as @box2d/controllers and @box2d/particles.

Somehow, all C# ports of Box2D didn't port it.

[VaclavElias]

I think there's a real maintenance risk here. Box2D.NET is currently a near 1:1 port and that makes syncing with upstream straightforward. LiquidFun is a fork that adds substantial subsystems (particles, etc.) Merging such functionality into the core would create a long-term maintenance burden. This is a pragmatic concern about maintainability, not resistance to new features. Could this be implemented as an optional extension or separate module? I'd like to hear ikpil's thoughts.

[ikpil]

I fully understand the value of LiquidFun and its particle and fluid simulation features. It would certainly be useful in the .NET environment as well.

However, the goal of Box2D.NET is not to be the most powerful 2D physics engine, but to provide a simple and easy-to-use 1:1 port of Box2D for the .NET environment.

Even small deviations from the original code can make maintenance increasingly difficult over time, and eventually the port may fall behind. To avoid this, I focus on maintaining a strict 1:1 port that closely follows upstream Box2D.

For this reason, I do not plan to include LiquidFun in the core implementation of Box2D.NET.

That said, adding LiquidFun as a separate module or project that extends Box2D.NET without affecting the core is theoretically possible, but in practice would be extremely challenging because the original Box2D was not designed to easily accommodate external modules.
I will not be developing a LiquidFun module myself, but I sincerely encourage anyone who wants to take on such a project.