Wanding is a very important process for the OptiTrack system calibration.
A calibration wall is used, which is repeatedly shaken in front of the cameras so that all cameras can see the markers.
The CalibrationWand must be brought into the capture volume and carefully shaken through the entire aspiration volume. To collect samples with different orientations, it is best to draw figures of eight.
For adequate sampling, we need to cover as much space as possible and cover both low and high heights.
The wanding trails are shown in color in the 2D view. A table with the status of the measurement process is displayed in the calibration area to monitor the progress.
After enough samples have been collected, the software can calculate. Generally 2,000 to 5,000 samples are sufficient.
When done, the cameras are displayed in Motive’s 3D viewer. However, the recording volume built into the software still has to be aligned with the coordinate plane. This is because the ground plane is not fixed.
The final step necessary to complete the calibration is to set the ground plane and origin by placing the calibration square in the volume and indicating on the subject where the calibration square is located. This needs to be positioned within the volume where we want to place the origin and level the ground floor.
To set the coordinate system, reference is made to the position and orientation of the calibration square, so it must be aligned in such a way that it relates to the desired axis orientation.
