CoP in B3D files doesn't match GUI or raw mot files.

[Tian-A-Tan]

I'm retrieving CoP of this trial from downloaded b3d using
cop = [frame.processingPasses[0].groundContactCenterOfPressure for frame in subject.readFrames(xxx)]
The retrieved anterior-posterior CoP (x-axis) values don't change along with the foot segment. However, in GUI or raw mot files it looks noisy but normal.

I looked into a few Carter dataset b3d files already and they all have this issue.

[Tian-A-Tan]

Just confirmed the CoP in opensim format is correct so it's likely to be a b3d writer issue.

Maybe look into CoP sanity check code or CoM to CoP conversion code if there is such code in the repo.

[Tian-A-Tan]

It's not caused by addb command line post-process script.