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Hello,

I am running OpenSim 4.2. I am trying to drive motion of my model through IMU data. My data is in the .json format, and includes acceleration (g), orientation (degrees), and rotation (degrees/second). I am trying to convert that input into .sto format to then import it into OpenSim to drive my model. I have converted my data into a .txt document that is tab separated. When I try to run posted codes to convert into .sto files, I get the error:

"java exception occurred:
java.lang.RuntimeException: Table does not have metadata for 'header'.
Thrown at XsensDataReader.cpp:94 in extendRead().
at org.opensim.modeling.opensimCommonJNI.DataAdapter_read(Native Method)
at org.opensim.modeling.DataAdapter.read(DataAdapter.java:48)"

• Any suggestions on how to convert from .txt to .sto?

• Is there a better way to go about converting and/or importing my IMU data?

I have been unsuccessful in running the OpenSense example. I hit an error that there is no conversion when trying to create the .sto orientation files.

Thank you!

Best Wishes

The Storage (.sto) file format is described on the "Storage (.sto) Files" page in the User's Guide: https://simtk-confluence.stanford.edu/d ... o%29+Files. Your file should work provided it adheres to the requirements described on that page.

Thank you for your reply! I got the file conversion to work. I do have another question about the data format within the .sto file. I see that in the "Rajagopal_OpenSense" OpenSim example model, the .sto file "walking_orientations.sto" has four columns of data (not including the time) for each time step. Can you explain what data is represented by each of these columns? It seems to me that I would only need to supply the x/y/z orientation data.

sorry, I still don't understand how to slove this problem (java.lang.RuntimeException: Table does not have metadata for 'header'.). Sould I modify the imu .txt file or somthings that I don't know. thank you for your taking your time.