Motion capture data can be previewed in OpenSim to verify that preprocessing was done correctly and that data is in agreement with the intended model. See __40__Preparing Your Data for more information about how to import your data into OpenSim. In some cases, you can also use OpenSim's feature for __40__Associating Data with a Motion. For example, if you've already run IK and you want to visualize marker data or ground reaction forces in sync with the inverse kinematics trial you should use the Associate Data motion feature.
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 | - Right-mouse click on the navigator node corresponding to the motion file viewed (e.g. subject_01_walk1.trc in the example above). Choose Transform from the drop-down menu.
- Double click on any listed folders to display the list of markers (e.g. Lab Frame in the example at right).
- Use the arrow buttons to change the angle for Rotate X, Rotate Y, and Rotate Z; this will transform the data in the viewer (and in the viewer only – not the data file itself).
- Angles are always positive (0-360 degrees).
- Translations can be previewed by modifying the display offset.
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The data file itself is NOT modified by OpenSim; the data previewer just displays the transformed data, so that the appropriate transformation(s) may be determined and applied during preprocessing. |
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 | - Select the marker data and grf data to sync the data and visualize the ground reaction forces with the marker motions.
- See __40__ Loading Motions for more information about how to sync motions.
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