What's the origin of coordinate of SMPL?

[Superlee506]

When I visualized the SMPL in meshlab, I find the origin of coordinate isn't the center of pelvis(root).
However in the human3.6m, the origin of the coordinate is pelvis(root). Do we need some pre-process before we calculate the loss3d?

Thansk.

[akanazawa]

Yes the training data aligns the 3D joints by root due to this reason:

hmr/src/ops.py

Line 50 in 8785764

def align_by_pelvis(joints):

Best,

Angjoo