Dear Ton van den Bogert, dear James, Thank you very much for your suggestions. They help me a lot to solve my problem! Indeed, I was struggling because I was confused about the the mismatch of the unit vector within the existing model and the anatomical inclination and deviation angles reported by I...

Dear OpenSim users, I just want to extend this already existing post as my question refers to the same topic of how to define the axis of rotation angles for custom joints. I am currently struggling in defining the axis of transform. Just as an example: Looking at the subtalar joint axis of the gait...