What do numbers in the SMPL pose predictions define

[zetyquickly]

Hello,

Could you please give a hint to the following question?

Whenever we use SMPL mesh_model for example in estimate_smpl.py it does return an array of 23 relative joint positions for each processed body. These joint positions are represented by three numbers, so it is 23 by 3 array of encoding the human pose.

I was wondering what does these triplets consist of? Are they relative [x,y,z] coords or maybe they define an angle around the globally defined axis?

[zetyquickly]

Am I right that these 3 numbers encode $\theta$ the rotation angle by norm of this 3D vector, and the normalized vector of these three numbers define the vector around which we rotate?