Apple Motion 4 - Manual (Page 1153)

Every time you make a change to the shape at a new frame, you automatically create a
keyframe in that shape’s Shape Animation parameter.
5 When you are done animating the shape, disable Record.
The animated shape object interpolates between each keyframed shape. If you don’t like
how the interpolation is working, you can add more keyframes to force the control points
to follow the path you want.
Interpolated shape First keyframe Second keyframe
You can also create, delete, and edit the timing of Shape Animation keyframes directly
in the Keyframe Editor. For simplicity, each change you make to a shape is recorded as a
single keyframe, no matter how many control points are edited. The Shape Animation
parameter only allows keyframes set to linear interpolation. You cannot use any other
form of keyframe interpolation.
The process used to animate both shapes and masks is identical. To see an example of
mask animation, see
Keyframing a Mask’s Shape for Animation and Rotoscoping . For
more information on keyframing in general, see Keyframes and Curves .
Saving Shapes and Shape Styles
Like all objects in Motion, shapes and shape styles (a custom gradient fill and outline, for
example) can be saved to the Library. This allows you to add to the content that Motion
provides to create a library of your own custom objects and styles, including customized
behaviors and filters or whole project groups. Content you put into the Library is available
to every project in Motion.
Custom shapes (including masks) can be saved in the Shapes, Favorites, or Favorites Menu
categories of the Library. Custom shape styles, which are saved via the Shape Style pop-up
menu, are automatically saved in the Shape Styles category. You can create your own
folders within the Library categories or subcategories to better organize your effects.
1153 Chapter 17 Using Shapes, Masks, and Paint Strokes