godot_voxel VS godot-jolt

Don't do this, CSG is unoptimized. Use this.

Take a look at https://github.com/Zylann/godot_voxel, which would be a great starting point that you could build game mechanics on top of.

https://github.com/Zylann/godot_voxel https://voxel-tools.readthedocs.io/en/latest/

Currently all our major C++ based number crunching is in the GDAL. We haven't had to make in-house GDExtensions or Modules, yet. But we do also use Godot Voxel. Both are good examples of where you'd want more native speed.

I originally ported Qodot to an engine module that required people to compile their own engine (like godot-voxel) but users were turned away at this first roadblock.

I really wanted to use it but sadly it might be hard to export projects done with it cuz it's not a gdextension yet https://github.com/Zylann/godot_voxel/issues/333 still possible but i think you gotta compile something.

If you aren't adverse to doing a custom editor build you could add https://github.com/Zylann/godot_voxel

To give some practical examples. At my day job we use GDAL (a C++ geospatial data processing library) and Zylann's Godot Voxel (a C++ engine Module) https://github.com/Zylann/godot_voxel

The master branch of this one will also build as a GDExtension for Windows. This one is successfully building regularly, but structured different than the rest of the GDExtensions I've seen. I haven't played with this project too much yet, but it's an insanely powerful module/extension: https://github.com/Zylann/godot_voxel

Some other Rust game engines ship with their own physics engine. Fyrox, for example, has advanced 2D/3D physics, supporting rigid bodies, joints, ray casting and more. Godot too, which has community-led Rust bindings also has an in-built physics engine as well as a Godot-native extension using the Jolt physics engine. In fact, which is reported to be more performant than the official physics engine.

When the performance of Godot's physics engine has been mentioned before I've seen https://github.com/godot-jolt/godot-jolt pointed to as a drop in more performant solution.

Haven't tried it in a project yet myself

No idea if this will solve your problems, but with Godot 4 Physics being a bit undercooked you might want to try a different physics engine. Like Godot-Jolt: https://github.com/godot-jolt/godot-jolt

Godot 4 itself is actually fairly good about diving to its C/C++ base for the nasty stuff. Like its Physics. The reimplementation for Jolt physics into Godot 4 is again C/C++ calculation library.

If you'd like to try out Godot Jolt for yourself, you can find the latest release, as well as important gotchas, on the project's GitHub page. Just bear in mind that the extension is still in development and will likely have a couple of bugs that have yet to be found. C# support for GDExtension is also not in a great place right now, so there are some issues there as well.

Try a different physics engine: https://github.com/godot-jolt/godot-jolt

Your comment made me do a bit of research and I found this: https://github.com/godot-jolt/godot-jolt

It's possible to create a GDExtension for it (similar to what was done for Jolt), but I haven't seen any for Bullet yet. There's a lot of hype going around Jolt, so it's understandably where most of the community effort is going :)

Or godot-jolt (linked in that Tweeter thread respones).