Adobe AFTER EFFECTS 5.5 Help Manual page 106

Adobe After Effects Help
Using Help | Contents
To move all points on a motion path in unison:
1 Display the Composition and Timeline windows for a composition.
2 In the Timeline window, select the layer containing the motion path you want to move.
3 Press P to open the Position property.
4 Click the word "Position" to select all Position keyframes.
5 In the Composition window, click a keyframe and drag the path to a new position.
Changing the number of visible motion-path keyframes
By default, After Effects displays motion path keyframes and dots in the Composition
window that fall within a 15-second range from the current-time marker. However, you
can change this default. For greater precision when extensively modifying a motion path,
you can display more keyframes. If you want to speed up screen updates, you can display
fewer keyframes.
To change the number of visible motion-path keyframes:
1 Choose Edit > Preferences > Display.
2 In the Motion Path section of the Display Preferences dialog box, select one of the
following options, and then click OK:
Click No Motion Path to prevent the display of a motion path and its keyframes.
•
Click All Keyframes to display every keyframe in the window.
•
Click No More Than __ Keyframes to specify a maximum number of keyframes to
•
display, centered on the current-time marker.
Click No More Than __ to specify a range of time within which keyframes display,
•
centered on the current-time marker.
Using Motion Sketch to draw a motion path
You can draw a path for the motion of a selected layer using Motion Sketch, which records
the position of the layer and the speed at which you draw. As you create the path, After
Effects generates a position keyframe at each frame, using the frame rate specified in the
composition.
Motion Sketch does not affect keyframes that you have set for other properties. For
example, if you set rotation keyframes for an image of a ball, you can use Motion Sketch to
generate position keyframes, so that the ball appears to roll along the path you created.
For a more fluid animation after you create a motion path using Motion Sketch, use the
Smoother to eliminate unnecessary keyframes. See "Smoothing motion and velocity" on
page 107 for information on using the Smoother.
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