Base segment gets 90 or 180 degree offset depending on which direction the subject is facing when calibration is done

[jerela]

Sometimes calibration be performed erroneously and the calculated motion is opposite or perpendicular to the actual subject's movement. This shows as the visualized model walking backwards with knees in unnatural angles when the subject is walking forward, or as the visualized model sidestepping when the subject is walking forward.
This is likely an issue with IMUPlacerLive or its configuration file.

[jerela]

Unable to find the issue in code.

However, since OpenSim 4.1 stable version, changes have been made to OpenSenseUtilities::computeHeadingCorrection.
(https://github.com/opensim-org/opensim-core/commits/master/OpenSim/Simulation/OpenSense/OpenSenseUtilities.cpp)

Even further improvements will be made to the next OpenSim version (opensim-org/opensim-core#2830 and opensim-org/opensim-core#2787).

Therefore this issue should be put to rest until OpenSim 4.2.

UNLESS as a temporary solution, the current OpenSenseUtilities::computeHeadingCorrection from development version of OpenSim is implemented as a method in IMUPlacerLive.

[jerela]

Fixed with commit b2bea88.
Leaving this issue open to remind myself to use OpenSim's own methods once OpenSim 4.2 is published.