Thanks, Thomas!

But already solved it by fixing GitHub dvarnai/pyC3D2OSIM python script.

resulting code here:
https://github.com/IISCI/c3d_2_trc

Opensim

File -> Preview Experimental Data... (open .trc file)

right click on experimental data .trc file in Navigator -> Transform

Rotate X/Y or Z

Save as... (transformed .trc file)

I made an experiment.

My original .trc file didn't throw any error

but after i save .trc from this original file using transfrom tool - it throws mentioned above error.

OpenSIM transform tool make .trc files corrupt after saving transformed .trc files with marker data OpenSIM throws an error when opening transformed file: InverseKinematicsTool Failed: Error reading column Labels in file transformed_walking2.trc'. Unexpected number of column labels. Expected = 46. R...

Thanks for the advice, but we found a solution. It seems that in the original script from https://simtk-confluence.stanford.edu:8443/display/OpenSim/C3D+%28.c3d%29+Files) used the wrong method for file read - fileRead(), taken from the parent class FileAdapter, it should be replaced with read() meth...

Hi! I tried to force python script from here (https://simtk-confluence.stanford.edu:8443/display/OpenSim/C3D+(.c3d)+Files) to work with no success. Fixed some minor bugs (here - https://github.com/IISCI/c3d_2_sto), but stuck on markers.flatten() method of AbstractDataTable, it is not implemented in ...