render.py - Why should we transfer the .npz to .json ?

[yangxiaoleyxl]

render.py lines 174 -180

" meta = json.load(open(os.path.join(seq, 'meta',
os.path.basename(anno_p).replace('.npz', '.json')
)))

    bbox_size = meta['bbox'][2] * meta['bbox'][3]
    focal_length = meta['focal']
    principal_point = meta['princpt']" 

It seems thats the .npz file (inference results) does not contain 'bbox' ,'focal' and other pose parameters, it contains these 10 parameters
" smplx_shape = {'betas': (-1, 10), 'transl': (-1, 3), 'global_orient': (-1, 3),
'body_pose': (-1, 21, 3), 'left_hand_pose': (-1, 15, 3), 'right_hand_pose': (-1, 15, 3),
'leye_pose': (-1, 3), 'reye_pose': (-1, 3), 'jaw_pose': (-1, 3), 'expression': (-1, 10)} "

how to understand the "meta" variable ?

Thanks ! :)