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From the Nexus Communications pane, you can select the Theia tab to access the Theia Batch Interface. From here you can select the required video files and process them. The files are processed through Theia3D, resulting in the output of C3D file(s) that contain rotation data for each subject.

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To run Theia processing on all trials in a specified folder:

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1. Run Theia processing on your trial data (see Run Theia processing on one or more selected video trials or Run Theia processing on all trials in a specified folder) and ensure that you have also run any processing needed to give you the required model outputs on the optical data for your trial.
2. Load the trial that you want to combine with your Theia data in the usual way, in Data Management.
   
   
   
   
3. In the Pipeline Tools, expand File Import pipeline operations, then double-click Add Theia Data to add it to the current pipeline. 

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4. In the Properties pane, specify the required settings:

   • Theia C3D folder: The Standard Folder location is the default location for Theia data, which is within the folder structure created by the previous Theia processing. The folder structure consists of a folder named Theia, which is a child of the session folder that contains the trials, and within this folder, the subfolders, whose names are 'TrialName _c3d'.
     
     
     
     If you didn't save the processed data to the standard location for Theia processing, change the Theia C3D Folder to the relevant location by clicking to the right of the Standard Folder field and then clearing the Macro box. You can then enter or browse to the folder location.
     

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     : Ensure the names of the files on which you want to run the Add Theia Data operation conform to the naming convention so that they begin with the trial name, followed by _subjectNumber.c3d or *_filt_subjectNumber.c3d, for example, walking_100_50_01_0.c3d or walking_100_50_01_filt_0.c3d.

   • Filtered: Select this option to run the operation on the filtered data. If cleared, the operation runs on the raw, unfiltered data. 

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5. Run the pipeline operation.
   On the Subjects Resources tab, in the Model Outputs for the relevant subject, the rotations are displayed and can also be visualized in the 3D Perspective view.
   At the top of the Subjects tree, the subject name has an asterisk ( * ) appended to it, to indicate that the data has changed and can now be saved.
   
   
   
   
6. Save the C3D to retain the merged rotations in your Nexus trial. 

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