Vertex and Cluster Action GMask Tracking

You can track mask vertices in your Action scene from the GMask object's Tracking tab.

To track mask vertices:

1. From the Action GMask menu's Tracking tab, select the media to be tracked from the Use Media field (to track the Back media, select 0).
2. In the image window, select the vertices you want to track.
3. Select a tracking mode:

   Two types of vertex tracking are available:

   • Each Vertex: Trackers are available for each selected vertex of the GMask.
   • Cluster: Tracker1 represents the selected vertices, and Tracker2 represents rotation and scale (if selected).

   If you select Cluster, enable Rotation, Scale or both, as needed.

4. Adjust any other Tracking Settings, as needed.
5. Click Enter Tracker.

   The Tracker menu is displayed.

6. In the Tracker menu, enable Context to use the Action scene as the reference.
7. Gang the trackers.
8. Enable Auto Update Reference.
9. Click Analyze to generate the tracking data.
   Note: You can fine-tune the tracking data if necessary. See Tracking Difficult Shots and Correcting Errors.
10. After the analysis is complete, click Return.

    The GMask menu in Action reappears. The tracking data is automatically applied to the GMask media.

11. Enable Edit Track in the GMask Vertices menu to edit tracking data directly from the image window without having to switch to the Animation channel. The vertices are displayed in blue when Edit Track is enabled.
    Tip: If you want to add new vertices to your tracked GMask, make sure to enable Edit Track before selecting Add Points, so that the new points also follow the tracking data.