Definition of a new marker-set as xml file

[Giulia Lisco]

Hello everybody,
I'm working on clinical gait analysis in a PhD program, exploiting this very useful software for many reasons.
Concerning the marker-set, I used the Helen-Hayes protocol, properly modifying the names of each marker in the .xml file related to the marker-set in use and everything was ok (scaling, IK and so on).

Then, I did some experimental measures with a customized marker-set, for further computations. My question is: how could I define this new marker-set in OpenSim?
I mean, is there the only possibility to use the GUI and position each marker manually or could I use a different method?
I have markers global coordinates wrt the lab frame, since the static acquisition... so could I use the first frame to define these ones in the OpenSim model, useful for the following scaling and IK processing?

Thanks a lot,
Giulia

[jimmy d]

HI Giulia,

The MarkerSet viewed in the GUI is generated from the the MarkerSet xml stored in the model or in its own file. You can edit the xml file directly or create/edit the markerSet in the API.

Finding the local position of each experimentally captured marker in the OpenSim body frame may be difficult. You can use the scale tools to iterate the marker placing, improving the marker placement on your subject.

Let us know how it goes,
-james