simtk.org

Hi I've been trying to create .mot files for my ground reaction forces. I've been looking at subject01_walk1.mot from the Gait2354 example. I'd just like to clarify what units the ground_force_vx etc are in and where exactly this data came from? Is the C3D file for this example available?

Hi Samuel,

I don't know what exactly software the official team using, but currently I am using Vicon Motus to export the data into C3D file and using a Matlab Toolkit to extract data and transform them into the essential format which OpenSim needed.

You can find the the Matlab Toolkit at the following address,

https://simtk.org/home/c3dtoolbox

As for the unit, I am pretty sure for forces the unit is Newton and for COP is "meter" and for the moment is "Newton * Meter".

Correct me if I was wrong about anything.

Thanks,
Yi Wang
University of Utah

王易是个好同志

Hi all,

If you use VICON motion capture systems,
please try our toolbox which directly converts VICON motion capture data(*.csv) into OpenSim inputs(*.trc and *.mot).
This is much easier and faster than converting C3D files.

Please refer to our project page: https://simtk.org/home/lee-son/
The toolbox v.1.4.1 is already available, but the user manual is now in preparation.
If you have any questions in using our toolbox, please contact us.

Lee

I am new to this opensim thing but I had a question about the units. We measured in N and mm so would I need to convert that before using the c3d converter?