How trajectories work

As long as 3D tracking is enabled in QTM, the software will automatically process trajectories at the end of a motion capture measurement. Using the 2D images of markers collected by the cameras and the coordinate system set during calibration, QTM is able to construct 3D points of the markers in space. It then sorts the points into individual paths, or trajectories.

When reviewing trajectories, it’s important to be familiar with the placement of the markers so that you can verify the 3D tracking and make any necessary adjustments. Ideally, each trajectory will correspond with a single marker and follow its movements during the measurement.

Occasionally, tracking issues can result in gaps in a trajectory or parts of one trajectory getting swapped with another. Issues like these can be solved using the editing tools in QTM.