RigidBody3D Player Controller for Godot 4 written in C#
godot_body_3d.cpp https://github.com/godotengine/godot/blob/44d539465acca7592e0c88748e231fe5f151da37/servers/physics_3d/godot_body_3d.cpp#L475
godot_body_3d.h https://github.com/godotengine/godot/blob/61630d4e1e279278d29576b979b710b9025f473e/servers/physics_3d/godot_body_3d.h#L254
built this to replicate and isolate an issue with a private project
now i guess i'm writing a controller