You
can add randomness to any property as it varies over time by using
The Wiggler. You can also use the wiggle expression
to accomplish this. In most cases, it is easier to use the expression
than to use The Wiggler. (See Property attributes and methods.)
Depending on the property
and the options you specify, The Wiggler adds a certain number of
deviations to a property by adding keyframes and randomizing interpolations
coming into or out of existing keyframes. You need at least two
keyframes to use The Wiggler.
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.
Choose Window > The Wiggler.
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.
Select a Noise Type option to specify the type of deviation
due to randomly distributed pixel values (noise):
Smooth Noise
Produces deviations that occur more gradually, without
sudden changes.
Jagged Noise
Produces sudden changes.
Select the dimensions of the property you want to affect:
One Dimension
Adds deviations to only one dimension of the selected property.
Choose the dimension from the menu.
All Dimensions
Independently adds a different set of deviations to each dimension.
All Dimensions The Same
Adds the same set of deviations to all dimensions.
Set Frequency to specify how many deviations (keyframes)
per second After Effects adds to the selected keyframes. A low value
produces only occasional deviations, while a high value produces
more erratic results. A value between 0 and 1 creates keyframes
at intervals of less than one per second. For example, a value of
0.5 creates one keyframe every 2 seconds.
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.
If necessary, choose Edit > Undo The Wiggler
to reset the keyframes, adjust the values for Frequency and Magnitude,
and then reapply The Wiggler.
Comments are no longer accepted for After Effects CS3. After Effects CS4 is the current version. To
discuss After Effects CS3, please use the Adobe forum.
Comments
Comments are no longer accepted for After Effects CS3. After Effects CS4 is the current version. To discuss After Effects CS3, please use the Adobe forum.