Tracking with Masks

You can track a point on your clip and apply that data to the axis of a piece of geometry or a hierarchy of objects. You can also track individual points on the mask. For information on tracking, see Tracking and Stabilizing.

To track the entire mask:

1. After creating a wipe, access the Wipe Editor and click Mask.
2. Select the wipe's mask axis.
3. Select Front or Back from the Layer box to specify whether you want to track on the outgoing clip (Front) or the incoming clip (Back).

   
   

   (a) S (Stabilizer) button  (b) Layer box  (c) Adjust option box  

4. Select an option from the Adjust option box.

   Select Adjust Offset if the selected mask is parented to one axis. Select Adjust Axis if the selected mask is parented to a hierarchy of objects.

5. Go to the first frame of the transition.
6. Click Stabilizer.
7. Set up the tracking point as needed.
8. Click Analyse.

   Fine-tune your analysis if necessary.

9. Click Return.

   The Wipe Editor reappears.

Tracking Individual Points on a Mask

You can also track individual points on a mask so that portions of the mask follow a point in the clip. Each point you select is assigned a tracker box in the Stabilizer. The points are repositioned according to the reference point you set in the Stabilizer. For more information on using the Stabilizer, see Tracking and Stabilizing.

To track individual points on a mask:

1. After creating a wipe, access the Wipe Editor.
2. Select a vertex or a group of vertices on a wipe's mask.
3. Click Mask.

   
   

   (a) S (Stabilizer) button  (b) Layer box  (c) Adjust option box  

4. Select Front or Back from the Layer box to specify whether you want to track on the outgoing clip (Front) or the incoming clip (Back).
5. Select an option from the Adjust option box.

   Select Adjust Tangents if you want the tangents for the selected points to be adjusted while the points are being tracked.

6. Go to the first frame of the transition.
7. Click Stabilizer.

   The Stabilizer appears. A Tracker button appears for each selected vertex.

   
   

   (a) Tracker buttons  (b) Analyse button  

8. Click Tracker 1, and then set up the first tracking point.
9. Click Tracker 2 to set up the second tracking point, and then continue setting up tracking points for all remaining vertices.
10. Click Analyse.

    Fine-tune your analysis if necessary. For example, disable problem trackers and analyse again.

11. Click Return.

    The Wipe Editor reappears.

12. Fine-tune your mask if necessary.