How to register my own mesh?

[Haozong-Zeng]

Hi, I am trying to use my own mesh model to add a new category for some specific tasks. The detectron2 document tells how to register a dataset in COCO format but does not mention the mesh model used in DensePose. For example, in detectron2\projects\DensePose\densepose\data\meshes\builtin.py,
MeshInfo( name="smpl_27554", data="smpl_27554.pkl", geodists="geodists/geodists_smpl_27554.pkl", symmetry="symmetry/symmetry_smpl_27554.pkl", texcoords="texcoords/texcoords_smpl_27554.pkl", )
How can I convert my mesh model into this format? I guess geodists_smpl_27554.pkl contains the geographical distances of the vertices, but not sure about symmetry_smpl_27554.pkl --- re-indexing the vertices?
Could anyone help me with that? Thanks.