how to read param.npz result from demo.py

[enrico310786]

Hi,
i run the script demo.py. Among the results, in addition to the .ply files, there is a .npz file. This contains a lot of information, including body_pose,left_hand_pose,right_hand_pose,jaw_pose,betas,expression,vertices,joints,full_pose,transl,v_shaped,proj_joints,shift_x,shift_y,focal_length_in_mm,focal_length_in_px,center,sensor_width.

Taking for example left_hand_pose, i can see the following coordinates

[[[ 7.7151352e-01 6.2732607e-01 1.0596585e-01]
[-6.0104364e-01 7.7329415e-01 -2.0189776e-01]
[-2.0859851e-01 9.2076764e-02 9.7365725e-01]]

[[ 3.5163164e-01 9.3468720e-01 -5.2106757e-02]
[-9.3588984e-01 3.4971061e-01 -4.2575989e-02]
[-2.1572944e-02 6.3737251e-02 9.9773359e-01]]

[[ 9.3272626e-01 3.3996129e-01 -1.2020016e-01]
[-3.3708388e-01 9.4043922e-01 4.4142537e-02]
[ 1.2804769e-01 -6.5536634e-04 9.9176782e-01]]

etc etc etc.

Is there any way to know which keypoint each coordinate refers to for each kind of poses? In which unit of measurement are the coordinates expressed (mm, px)? I would like to reconstruct the whole skeleton and its 3D keypoints. In this case, what are the keypoints of the skeleton?

Thanks