Issue with WaveFront OBJ meshes

[neurolabusc]

Here is the same mesh as a WaveFront .obj file nd STL format mesh. I can easily convert the vtk format file, but the converting the obj file results in a iwm.cbor file that has nonsense values.

from itkwasm_image_io import imread, imwrite
from itkwasm_mesh_io import meshread, meshwrite
mesh = meshread('brain.obj')
meshwrite(mesh, 'brainOBJ.iwm.cbor')
mesh = meshread('brain.stl')
meshwrite(mesh, 'brainSTL.iwm.cbor')
mesh = meshread('brain.vtk')
meshwrite(mesh, 'brainVTK.iwm.cbor')

The cells from the STL file are BigUint64Array with each triangle listed as 2 3 i j k where 2 is indicates a triangle type and 3 indicates that three indices follows, with i j k being the indices:

In contrast, all the values for the converted OBJ files are huge - out of range of all triangles and of invalid cell types:

3DSlicer, Meshlab, Surfice and NiiVue all open the OBJ file fine. I note that the ITK code is designed to read faces (f), vertices (v) and the optional vertex normals (vn), while this file only has vertices and faces, so perhaps ITK demands the normals.