Keyframe shape control points
You can keyframe the control points of a shape. When you do so, the changes are recorded to the Shape Animation parameter, visible in the Keyframe Editor. Keyframes added to the animation parameter affect all the shape’s control points simultaneously.
The process used to animate both masks and shapes is identical. To see an example of mask animation, see Rotoscope a mask’s shape. For more information on keyframing in general, see Keyframing overview.
Keyframe a shape’s control points
In the Layers list, Canvas, or Timeline, select a shape.
Click and hold the 2D transform tools pop-up menu in the toolbar, then choose the Edit Points tool.
The selected shape’s control points appear in the Canvas.
Click the Record button in the transport controls under the Canvas (or press A) to turn on keyframe recording.
Move the playhead to the frame where you want to change the shape, then make any necessary changes to the shape’s control points by dragging them in the Canvas or by adjusting the Control Points controls in the Geometry pane of the Shape Inspector.
In the Keyframe Editor (press Command-8 to open it), a keyframe appears for each adjustment you make at a new frame.
Note: Adjusting a shape while the playhead is on an existing keyframe adjusts the shape at that keyframe.
Continue advancing frames and making changes.
Every time you make a change to the shape at a new frame, you create a keyframe in that shape’s animation channel.
When you’re done animating the shape, click the Record button in the transport controls to turn off keyframe recording.
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.
In the Keyframe Editor, you can also create, delete, and edit the timing of keyframes in the shape’s animation parameter. 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’s animation parameter allows only keyframes set to linear interpolation. You cannot use any other form of keyframe interpolation.