Export 3D voronoi for meshing in salome : groups


I am quite new in rhino and grasshopper but cannot get around the following :

I am trying to export a 3D voronoi build in rhino/grasshopper so that I can mesh it after in Salome.

Each voronoi cell is well closed (closed polysurface) and I can export a in a step format the all set of closed cells but once imported in salome and mesh i can not get a separation of the elements in groups for each voronoi cell. I need that for giving specific material properties for each voro cells at the end… !

For now it is a simple test then I will need complex shapes and the use of rhino will be good for that.

any help will be most gratefull

the voronoi cells

the grasshopper part