With FreeCAD you can import the OBJ and with the "Workbench part" convert it in part with the command create shape from mesh, and then save the file by exporting the selections as a STEP and import your reference in Moi3D.
this is an example of poly obj with triangles, convereted and imported.
but be careful because if the mesh is too dense you will have problems.
Greetings
|