NumFrames, 900 in this case, indicates the number of frames (rows) of data in the whole. So, for example, from frame 1 to frame 2, the time increases by 1/60 second. trc file figure above would look like this in plain text: Frame#… where indicates each tab character that would be present in the file.ĭataRate, 60 in this case, indicates the sampling rate of the data in this. Each row of data contains a frame number followed by a time value followed by the ( x, y, z) coordinates of each marker. trc file is a header, followed by two rows of column labels, followed by a blank row, followed by the rows of data. The first few lines of the file are shown here. A fragment of this file is shown in the figure below.įigure. trc file (subject01_c) is provided in the Models/Gait2354_Simbody directory, which is part of the OpenSim distribution. trc (Track Row Column) file format was created by Motion Analysis Corporation to specify the positions of markers placed on a subject at different times during a motion capture trial.
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