Thanks Ayman's reply, it seems that the method of the IMU-IK tool is orientation-based inverse kinematics,I found the related paper: doi.org/10.1080/10255842.2018.1522532 it seems that the experimental IMU's quaternion data is the "ground truth",and the calibration osim.model's orientation is the in...

Dear all: I want to know the pricinple of the IMU inverse kinematics,when I search the document of this:https://simtk-confluence.stanford.edu:8443/display/OpenSim/How+IMU+Inverse+Kinematics+Works,I find the sentences as follows: An orientation error is the orientation difference between the experime...