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2 Click Push to move the mask down a layer; click Pop to move the mask up a layer.
NOTE You cannot animate the priority by setting Push and Pop at different frames. When you set a mask's
priority with Push or Pop, it is set for the entire clip.
Transforming the Mask
You can apply transformations such as translation, rotation, scaling, shearing, and centre changes to a
garbage mask. The transformation data for the mask is stored in its Axis node. You apply transformations
to the mask using the Axis controls.
All transformation parameters in the Axis menu can be animated. You can use a motion path to animate
the position of a mask.
You can also apply motion blur to a garbage mask. See
Applying Motion Blur to Garbage Masks (page 761).
To transform a mask:
1 Access the Garbage Mask menu.
The Axis controls appear.
NOTE The Axis controls are similar to the Axis menu in Action.
2 Use the Transformation fields to modify the position, shape, and size of the mask.
Manipulating Vertices and Tangents
Use the options in the Tools box to manipulate the vertices on the mask. You can edit the mask most easily
in Front, Key-In, or Matte view.
Selecting Vertices and Tangents
You can select vertices and tangent handles when Select, Move, or Scale is selected in the Tools box:
■ To select an individual vertex or tangent handle, click the vertex or tangent handle.
■ To select multiple vertices, Ctrl-drag a selection box over a series of vertices.
752 | Chapter 18 Masking and Rotoscoping