code: def from_data( name, coors, ngroups, conns, mat_ids, descs, igs = None ):
          
          if igs is None:
              igs = range( len( conns ) )
          mesh = Mesh(name)
          mesh._set_data(coors = coors,
                         ngroups = ngroups,
                         conns = [conns[ig] for ig in igs],
                         mat_ids = [mat_ids[ig] for ig in igs],
                         descs = [descs[ig] for ig in igs])
          mesh._set_shape_info()
          return mesh
docs: Create a mesh from mesh data.