Hi Paolo, doesn't FreeCAD support opening STEP (.stp/.step) format files? You should be able to transfer NURBS surfaces between MoI and FreeCAD using STEP format.

Could you clarify what advantage there would be to using .brep format for the transfer instead of STEP format?


re:
> And for info about glTF here https://www.khronos.org/gltf/

It appears to only support polygon mesh geometry? It looks like there are various converters available to convert from OBJ to glTF format, like here's one example:
https://github.com/CesiumGS/obj2gltf


Sorry currently I wouldn't expect to support either of these from MoI directly. The amount of work to the amount of benefit ratio is not good since you can just use other already existing methods for Freecad transfer, and other already existing converters for glTF.

- Michael