2017

(a) Shape channel with 4 keyframes
NOTE Enabling Shape Animation disables the Vertex Keyframing and Channel Selecting boxes in the Garbage
Mask Setup menu. These contain options for animating individual vertex channels. See Animating Masks
Using Spline Keyframing
(page 756).
6 Depending on how you want to animate the garbage mask, use the Linear Interpolation and Constant
Shape buttons as follows.
To:Enable:
Make the garbage mask trajectory linear. Enable this button when rotoscoping. For
smooth garbage mask animation, disable this button.
Linear Interpolation
Keep the garbage mask shape the same for all frames. When you enable this button, the
following message appears: “Remove all keyframes except current one?” Click Confirm.
Constant Shape
Animating Masks Using Spline Keyframing
You can animate the shape of a mask by moving the vertices of a garbage mask spline at different frames
throughout the clip. Each vertex has its own X, Y and Z position channels in the Channel Editor, as well as
several other parameters, as shown in the following table.
Channel Editor ValuesChannel Editor Folder &
Name(s)
Parameter
position: X, Y, ZThe position of the mask vertices.
tangents: left, rightThe position of the left and right tangent handles rel-
ative to the mask vertex.
0 = broken handles
1 = unbroken handles
tangents: continuityThe tangent continuity (handles broken or unbroken).
0= inactive
1 = active
Vertex_x: activeThe active/inactive status of mask vertices. See
Adding
and Removing Vertices (page 758).
756 | Chapter 18 Masking and Rotoscoping