Tracking rotation (PB only)When you track rotation, you duplicate the rotation of a specified region in one layer in another layer. When tracking only rotation, the Tracker/Stabilizer does not track position but generates only rotation keyframes for the second layer. In other words, the second layer is not attached to the first; the second layer remains in the position you have specified in the composition, rotating relative to the specified region's arc of rotation. The rotation in the first layer is defined by two feature regions and the axis that runs between them. An arrow on the axis points from the first feature region to the second. The Tracker/Stabilizer tracks the rotation by measuring the angle of the axis in relation to the first feature region: as either feature region moves, the angle of the axis changes. Note that even if the objects tracked inside both feature regions are moving up, down, or across, the Tracker/Stabilizer tracks only the relative rotation between the regions, not the overall movement. Because the second layer is not attached to the first, there is no track point. To define tracking regions for rotation:
|