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How to export ligament length from opensim directly?
Posted: Wed Feb 24, 2021 8:17 am
by tyq_80
Hello, everyone. I have add some custom ligaments in the foot model. Now I want to get ligament length to calculate ligament strain during one gait cycle. However, I don't know how to export ligament length from opensim.Is there anyone can you help me? Thanks a lot.
Re: How to export ligament length from opensim directly?
Posted: Mon Mar 01, 2021 4:27 am
by clnsmith
https://simtk.org/frs/?group_id=91
If you install the OpenSim 4.2 beta, there is a new component called the Blankevoort1991Ligament. This component has an output called "length"
You can find an example of the xml structure here (or in Help->XML Browser in OpenSim 4.2 GUI):
https://github.com/clnsmith/opensim-jam ... sim#L10444
Here is a doxygen page since I don't think there is one published online for 4.2 yet.
https://github.com/clnsmith/opensim-jam ... oxygen.pdf
Re: How to export ligament length from opensim directly?
Posted: Mon Mar 01, 2021 4:29 am
by clnsmith
If you are using the existing Ligament component, you can use the getLength (const SimTK::State &s) function.
https://simtk.org/api_docs/opensim/api_ ... ament.html