Apple Motion 3 - Manual (Page 1082)

1082 Chapter 12 Using Shapes and Masks
4 Continue advancing frames and making changes as needed.
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.
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 ” on
page 1101. For more information on keyframing in general, see “ Keyframes and Curves ”
on page 503.
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.
Interpolated shape First keyframe Second keyframe