I use Griddle for Rhino and Midas FEA NX to create surface and volume mesh, but I’m not sure if Sofistik be able to import these mesh?
The Griddle created surface mesh is a native Rhino file, while the volume mesh can be saved as FLAC3D, 3DEC_5x, 3DEC_7x, ABAQUS, ANSYS, NASTRAN, LS-DYNA, VRML, CSV
The Midas FEA NX can export surface and volume mesh in STL format.