code: def domain_from_mesh(mesh):
      """Instantiate a StructuredDomain from a gifti mesh
  
      Parameters
      ----------
      mesh: nibabel gifti mesh instance, or path to such a mesh
  
      """
      if isinstance(mesh, str):
          from nibabel.gifti import read
  
          mesh_ = read(mesh)
      else:
          mesh_ = mesh
  
      if len(mesh_.darrays) == 2:
          cor, tri = mesh_.darrays
      elif len(mesh_.darrays) == 3:
          cor, nor, tri = mesh_.darrays
      else:
          raise Exception(
              f"{len(mesh_.darrays)} arrays in gifti file (case not handled)"
          )
      mesh_dom = MeshDomain(cor.data, tri.data)
  
      vol = mesh_dom.area()
      topology = mesh_dom.topology()
      dim = 2
      return StructuredDomain(dim, mesh_dom.coord, vol, topology)
  
imports: import numpy
  import scipy.sparse
  from nibabel import Nifti1Image, load, save
  from nipy.algorithms.graph import WeightedGraph, wgraph_from_3d_grid, wgraph_from_coo_matrix
  from nipy.io.nibcompat import get_affine, get_header
label_desc: Use image node_id 13 for calling a global function with example usage: domain_from_mesh(mesh) and returns: StructuredDomain