Erratic hybrid muscle wrapping around ellipsoid

[emikohou]

cross-posted to https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=17546&p=0&start=0&view=&sid=8e8718c366635afe91784b8fe4d0d652

Steps to reproduce

I've tried midpoint & axial wrapping methods as advised by the docs, and I understand that muscle wrapping (particularly around ellipsoids) is an ongoing project. If this particular problem hasn't yet been resolved, is there a workaround that can help with the discontinuities?

Expected result

The muscle wraps smoothly around the thorax throughout the motion, via hybrid wrapping

Actual result

Following images are posterior views of model, ordered from beginning of motion to end.

1. Beginning of motion, TRAP4 highlighted:
   

2. TRAP4 still wrapping but glitching:
   

3. TRAP4 no longer wrapping:
   

4. TRAP4 wrapping once again at end of motion:
   

Environment and GUI version

Opensim Gui 4.3

I've tried midpoint & axial wrapping methods as advised by the docs, and I understand that muscle wrapping (particularly around ellipsoids) is an ongoing project. If this particular problem hasn't yet been resolved, is there a workaround that can help with the discontinuities? See below graph of muscle moment arms.

Thanks for the help