about windows mesh

`
import trimesh
def convert_mesh(mesh, corr_setup):
         v = np.vstack((mesh.vertices, np.zeros_like(mesh.vertices)))
          return trimesh.Trimesh(vertices=corr_setup['mtx'].dot(v), faces=corr_setup['f_out'])

  BFM_mesh = trimesh.load(BFM_mesh_fname)

  trimesh.Trimesh(vertices=v_out, faces=model.f).export(FLAME_out_fname)


`