Content Comparison

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• An Ethernet network port on the Nexus computer
• The RJ45 port on the Tobii recording unit

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1. Ensure you have successfully connected the Tobii recording unit via Ethernet, as described above.
2. Browse to http://<recording unit serial number>.local/network.html.
3. Either create a new Wi-Fi configuration or select an existing one. To create a new one:
   
   1. Under WiFi, click Create
   2. Set the SSID, network security type, and password, if required.
   3. Click Apply.
4. Disconnect the Ethernet cable. 

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1. Ensure the Tobii recording unit is connected to the Nexus computer via Ethernet or WiFi (see Connect a Tobii recording unit to the Nexus computer).
2. Ensure that the Tobii glasses are being worn by a subject in the volume. 
   (Tobii glasses connect to Nexus only when the glasses are worn: if no eye is detected, the device is gray in the System Resources tree.)
3. In the System Resources tree, right-click Devices, point to Add Digital Device and then select Add Tobii Pro Glasses 2 or Add Tobii Pro Glasses 3.
   
   
   
   Nexus searches for the glasses on the network. When the glasses are discovered, data begins streaming in Nexus.
   Note that this process can take some time. 

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4. With the Tobii Pro Glasses device selected in the System tree, in the Properties pane, ensure that in the Sampling Rate field, the required sample rate is selected.
   
   
   

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5. Before capturing data, for each subject, perform a calibration on each subject in the same way as it is done in the Tobii Glasses software.
   1. Instruct the subject to look at the calibration card, with the card held between 0.5 m and 1.5 m from the subject (for correct placement of the card, see the Tobii documentation).
   2. In the System Resources tree, ensure the required Tobii Pro Glasses device is selected and in the Properties pane, go to the Calibration section and click Start Calibration.
      
      
      
      Ensure the subject continues to look at the calibration card.
      After approximately three seconds, status information is displayed, with a success or fail status at the end of the process.

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      • If calibration is successful, the Calibration Status changes to calibrated.
      • If calibration fails, see Possible calibration issues for a list of suggested issues, and correct any issues that you identify.
        
        
        
        Note that, for Tobii Pro Glasses 2, data that is needed for calibration is created on the SD card and is deleted when the device is deleted. If the connection is lost, projects and participants may be left on the SD card.
        If no data is received for approximately one second, it is assumed that the connection has been lost and the device reverts to 'discovery' mode to try to re-connect to the device when it becomes available again.
6. The Tobii Pro Glasses 3 mocap integration kit is provided as two marker tree attachments. Attach the mocap integration kit by screwing it into the fittings on the frame of the glasses.
   The Nexus installer provides two VSTs for the two variants of these marker trees. If you require more subjects, you can interchange the left/right trees from each of these two sets. For additional VSTs, contact Vicon Support.

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7. Load the appropriate VST. The relevant VSTs for the version of the integration kit provided in your Tobii Pro Glasses box are found in:
   C:\Program Files (x86)\Vicon\Nexus2.#\ModelTemplates
   
   
   
   
8. To visualize the gaze data in the Nexus workspace, with the Tobii Pro Glasses device selected in the System tree, go to the General section of the Properties pane and set the Glasses Segment to the name of the segment that the glasses are attached to.
   
   
   
   Note that specification of the Glasses Segment is not a requirement for receiving the data from the glasses: it is used for visualization in the Nexus workspace only. Also note that if multiple Tobii Pro Glasses are in use, the additional subjects must have unique segment names.  To do this, for each eye tracker, in the Glasses Segment field, specify the subject name followed by a colon and the segment name, for example, SubjectAGlasses:TobiiGlasses and SubjectBGlasses:TobiiGlasses.

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9. Ensure that Nexus is running in Kinematic Fit processing mode.
   The eyes are displayed relative to the glasses segment at positions specified by the Left/Right Eye X,Y,Z components, and gaze direction is shown as a line from each eye to the Gaze position.
   The eye itself also rotates to match the Left/Right Gaze value, though this may be difficult to observe.

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