fbx to ply conversion is almost definitely related to attempts to export 3D models in FBX exchange format to a simple polygon graphics format (PLY). Whilst we have not found any specific information about such export or conversion, both formats are well-supported in majority of 3D modeling tools.
So in case you are looking for some particular export, it might be best to reach out to some of the 3D modeling online community networks.
Updated: October 10, 2023