I finally found time to clean up my code and explain why I asked earlier.

I work with 2D and 3D data (Open3D natively only knows 3D), but the bigger problem is that my application requires periodic boundary conditions (pbc). And it just happens that I have such an extension to the PyG radius search, which I integrated into neuraloperator: arturtoshev@dce7fa9

Let me know if any of that is of interest, and if so, I can further clean up and RP.

This is really interesting, thanks @arturtoshev ! This would make an excellent PR. We currently rely on Open3d for processing .ply triangle meshes for one dataset, but the 3d neighbor search is a known pain point and a better approach would be very welcome.