FEM: mesh tools, use for voumes the better get group data def
FEM: mesh tools, use for voumes the better get group data def

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master