Adobe 65008009 - After Effects CS4 Using Manual page 236

Last updated 12/21/2009
Using the Wiggler, you can more closely simulate natural movement within specified limits. For example, add
randomness to an animated butterfly to produce fluttering. Add it to brightness or opacity to simulate the flicker of an
old projector.
Select a range of keyframes for the property.
1
Choose Window > Wiggler.
2
3 For Apply To, select the type of curve you want the Wiggler to change. If you selected keyframes for a property that
varies spatially, you can select Spatial Path to add deviations to the motion, or Temporal Graph to add deviations
to the velocity. If you selected keyframes for a property that does not vary spatially, you can select only Temporal
Graph.
4 Select a Noise Type option to specify the type of deviation due to randomly distributed pixel values (noise):
Produces deviations that occur more gradually, without sudden changes.
Smooth Noise
Produces sudden changes.
Jagged Noise
5 Select the dimensions of the property you want to affect:
Adds deviations to only one dimension of the selected property. Choose the dimension from the menu.
X, Y, or Z
Independently adds a different set of deviations to each dimension.
All Independently
Adds the same set of deviations to all dimensions.
All The Same
Set Frequency to specify how many deviations (keyframes) per second After Effects adds to the selected keyframes.
6
A low value produces only occasional deviations, while a high value produces more erratic results. A value less than
1 creates keyframes at intervals of less than one per second. For example, a value of 0.5 creates one keyframe every
2 seconds.
7 Set Magnitude to specify the maximum size of the deviations. After Effects sets the specified magnitude to the units
of the selected property, so a value for one property may produce very different results in another property.
Click Apply and preview the results.
8
9 If necessary, choose Edit > Undo Wiggler to reset the keyframes, adjust the values for Frequency and Magnitude,
and then reapply the Wiggler.
More Help topics
"Select keyframes" on page 215
Convert audio to keyframes
The Convert Audio To Keyframes keyframe assistant analyzes audio amplitude within the work area and creates
keyframes for audio amplitude.
❖
With the composition active in the Composition panel or Timeline panel, choose Animation > Keyframe
Assistant > Convert Audio To Keyframes.
This keyframe assistant creates an Audio Amplitude layer representing all audio sources in the composition, with three
Expression Controls effects with Slider properties that contain the keyframes: Left Channel, Right Channel, and Both
Channels.
To make use of the keyframes created by this keyframe assistant, link the changes in audio amplitude to other layer
properties. For example, use an expression to link the audio keyframes to the Scale property of a layer to make the layer
grow and shrink as the amplitude increases and decreases.
230
USING AFTER EFFECTS CS4
Animation and keyframes