# Swap nose-point and tail-base point manually

Aim

To correct body point swaps that may have occurred when tracking the nose-point and the tail-base point.

Procedure

1.Play the track until you find samples with wrongly-assigned nose-point and tail-base. See To check that nose-point and tail-base were mistakenly exchanged, choose Analysis > Results > Integrated Visualization. Play back the tracks with the video on the background. Check that the nose-point and tail-base do correspond to the actual orientation of the subject.

2.Select the sample (or range of) in which you want to swap the nose-point and tail-base.

Result: The selected samples are highlighted.

3.Click the Swap nose and tail button on the toolbar, or press the W key.

Result: The nose-point and tail-base within each sample in the selection are swapped. In the Samples List, the coordinates are swapped between Nose-point and Tail-base for those samples.

Notes

▪When you swap nose- and tail-base points, the Head direction line is recalculated as the prolongation of the segment joining the center-point and the tail-base point. This influences the calculation of Head direction, Head directed to zone and Turn angle and Angular velocity when they are based on Head direction.