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Table Of Contents
To delete a vertex from the mask:
1 At any frame, switch to Delete mode.
2 Click the vertex.
It becomes inactive.
3 Click the vertex a second time.
It is removed from the mask for the duration of the clip.
NOTE You cannot delete the last three vertices of a mask, as they are the minimum necessary to define it.
If you want to delete the mask, you delete its Geom node in the Garbage Mask Schematic.
Animating Masks Using Tracking
You can animate a mask by applying tracking data to it. This is useful when you want a garbage mask to
follow a moving element in a clip. To do this, you can either:
■ Animate the entire mask by applying the data to the mask's axis.
You can track an object on the front or back clip and apply the tracking data to the axis of a mask, or to
a hierarchy of masks.
■ Animate selected vertices according to reference points that you set in the Stabilizer.
Each vertex you select is assigned a tracker in the Stabilizer. The vertices are repositioned according to
the reference points that you set in the Stabilizer.
When you apply tracking data to a mask, only the mask axis, or position of selected vertices, is animated.
Any other keyframes set for the mask are disregarded. You can, however, animate individual vertices after
applying tracking data to your mask's axis or to individual vertices. It is especially useful to manually adjust
the tangent handles of the vertices at different frames where needed.
To animate an entire mask with tracking:
1 Access the Garbage Mask menu.
The Garbage Mask menu appears.
2 Select the mask.
3 From the Clip box, select the clip you want to track.
4 If necessary, adjust the mask using the Position, Rotation, Scale, Shear, and Centre fields.
5 Set the Rotation and Scaling options. To track rotation, select Rotation On; to track scaling, select
Scaling On.
6 Select an option from the Adjust box.
If the selected mask is:Select:
Parented to one axis.Adj Offset
Parented to a hierarchy of objects.Adj Axis
7 Go to the frame where you want to start tracking.
8 Click S.
The Stabilizer appears.
9 Position of the trackers.
760 | Chapter 18 Masking and Rotoscoping