2017

To:Select:
No keyframes are set.Off
Vertex Keyframing box Sets the conditions under which parameters are applied to specified vertices in the
mask.
NOTE The Vertex Keyframing box is only available if you disable Shape Animation from the Garbage Mask menu.
To:Select:
Set a keyframe for the parameter you are animating for all the vertices of the mask. Related
elements, such as tangents, also all get a keyframe when you animate a parameter on the
mask.
All Vertices
Set a keyframe for the parameter you are animating for all selected vertices on the mask.
Related elements, such as tangents, that are selected, also all get a keyframe when you
animate one on the mask.
Selected Vertices
Channel Selecting box Determines which channels are selected in the Channel Editor when you select one
or more vertices.
NOTE The Channel Selecting box is only available if you disable Shape Animation from the Garbage Mask menu.
To:Select:
Select all the channels related to the vertices you select on the garbage mask. For example,
whether you select a vertex or one of its tangents, its active, position, and tangent channels
are also selected in the Channel Editor.
Vertex
Select only the particular channel corresponding to the selected vertices. For example, if
you select the right tangent handle of a vertex, only the corresponding right channel is
selected in the Channel Editor.
Item
Adding and Removing Vertices
To further control the shape of a mask throughout the clip, you can add and remove vertices from your
mask at any frame of the clip. For example, if the shape changes radically or gets bigger part way through
the clip, you can add vertices to reshape the mask at that frame. When you add a vertex part way through
the clip, it is added to the whole clip but respects the existing shape of the mask in all previous and subsequent
frames. Therefore, any reshaping that you have done to the mask is not affected by the new vertices.
NOTE Adding or deleting vertices on masks with freehand segments causes the Lasso Fit value to lose influence.
See
Adjusting the Number of Points in Freehand Segments (page 750).
If you delete a vertex, it becomes “inactive” from that frame to the next active/inactive keyframe set for that
vertex, or, if there are no keyframes, to the end of the clip. An inactive vertex has no effect on the shape of
the mask. On previous frames, the vertex is still active, so the mask shape is unchanged by the deletion. To
delete the vertex completely (that is, throughout the whole clip), click it a second time.
758 | Chapter 18 Masking and Rotoscoping