Tool(s) to adjust or replace the default head mesh (missing?)

[hg111]

Hello,

I am looking for a way to experiment with different head/face mesh models. If I understand correctly, the project doesn't directly import the sub_mesh.obj and instead takes 3 .npy files (topology_info.py, exp_info.npy, keys_info.npy) that were somehow processed from, or in connection with sub_mesh.obj. In examining these files I see that the keys are different than what you might expect from a "standard" obj file that was converted to .npy. So for example, if a typical mesh converted would generate keys: vertices, faces, normals, uvs
topology_info.npy keys are: tris, vert_tris, sub_inds

Is there a tool/python script, you used and might have to create the .npy files that import to the project? any documentation that explain the their structure and relationships to the model?

Thank you in advance