Is there C# support?

[ValorZard]

[Demindiro]

The wrapper for the physics engine is in Rust only, but on the Godot side you can use any language as this wrapper is meant as a drop-in replacement + some extra features.

[Xrayez]

For this to work properly, Rapier would need to be implemented as a built-in physics backend in Godot. This way, even Rust bindings could take advantage of built-in physics. And this could only be done via C++ modules capabilities in Godot, like I do with https://github.com/goostengine/goost, for instance. All classes implemented on the core level are also automagically available in GDScript, VisualScript, NativeScript, C# etc.