During calibration, the Vicon Evoke camera calibration process calculates the physical position and orientation of each Vicon camera in the capture volume based on the movement of a calibration object (usually a Vicon Active Wand). The process describes the capture volume to the system, enabling Evoke to determine the physical positions, orientations, and lens properties of the Vicon cameras in the capture volume, and to correct for any lens distortion. Evoke uses this information to produce accurate 3D data.
...
When a camera calibration process has completed, Evoke saves two identical calibration parameters (.xcp) files and two corresponding identical raw camera data (.x2d) files to a calibrations folder ( C:\ProgramData\Vicon\Calibrations ). The .xcp contains the calibration settings and threshold data specified for the Vicon cameras in your Evoke system and is used when data from these cameras is processed. The difference between the two .xcp and two .x2d files is in their naming convention within the calibrations folder and how they are automatically managed.
...
You specify settings for the calibration of Vicon cameras in the Camera Calibration panel.
| Note |
|---|
Important Calibration is a necessary process to enable accurate tracking. To understand the cadence at which you should perform a calibration, see Maintain system health. When calibrating, you can perform the level of camera calibration that suits your requirements: a full camera calibration or a calibration of only a selected camera (for more information, see Calibrate selected cameras). |
When you first connect up your Vicon system and start Vicon Evoke, notice that in the System panel and in the Cameras view, icons give you feedback on the current status of the cameras. The cyan icon 
indicates that although the cameras are connected, they are not yet calibrated.
...
To display a layout of panels and views that is optimized for calibration, consider using the Camera Calibration view type (see Load and save window layouts). This displays only the System and Camera Calibration panels, while maximizing the Workspace to display all the camera views.
...