User Guide

415
ADOBE AFTER EFFECTS 5.0
User Guide
To run a script:
1 Open the composition and set the work area to the time span over which you want
Motion Math to create keyframes.
2 Select a layer.
3 Choose Layer > Keyframe Assistant > Motion Math. The Copy Values script appears by
default in the script editor the first time you start Motion Math.
4 To run a different script, click the Load button, and locate the script you want to run.
5 Select the script, and click Open. The script you selected appears in the script editor.
6 Use the Layer, Property, and Channel menus to select the elements that will have
keyframes generated or modified by the Motion Math script.
7 Specify how Motion Math generates keyframes:
• Sample At creates the specified number of new keyframes per second. To keep the
number of keyframes manageable, type 10 or fewer.
Note: When you choose Sample At, Motion Math deletes and replaces any existing keyframes
in the work area for the specified property and layer. Keyframes outside the work area are not
affected.
• Sample Only at Existing Keyframes creates no new keyframes but changes the values of
existing keyframes.
8 Click Apply, and then preview the result.
9 To modify or reapply the motion or effect, reopen the Motion Math window, change
your selections in step 7, adjust the scale factor as needed, and then click Apply.
10 To save the changes you’ve made to the script, click Save, and then type a new name
for the script.
In addition to specifying the number of new keyframes per second, you can reduce the
number of keyframes by applying The Smoother. See “Smoothing motion and velocity”
on page 177.
UG.book Page 415 Wednesday, February 21, 2001 12:05 PM