SPIN model in the architecture

[HenriMir]

Hello!

Thanks again for the amazing work! I still have one question regarding the SPIN skeleton model you use in preprocessing.

For exemple for the MPI-INF-3DHP dataset, preprocessed in https://github.com/mkocabas/VIBE/blob/master/lib/data_utils/mpii3d_utils.py You appear to convert the MPI-INF-3DHP skeleton structure into spin skeleton structure with the convert_kps function. As far as I understood it you are then able to use it for train since you can convert from predicted SMPL pose&shape to SPIN model.

My question is : why do you use the SPIN model at all? Was it not possible to convert from the MPI-INF-3DHP skeleton structure to SMPL and directly train on SMPL?

Thanks for any clarification on that subject!