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Using Help | Contents |
Using Property and Tracking
Controls (PB only)
Adding randomness (PB only)
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. See "Property attributes and
methods" on page 262.) 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.
To add randomness to a property:
1 Select a range of keyframes for the property.
2 Choose Window > The Wiggler.
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):
Smooth Noise produces deviations that occur more gradually, without sudden
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changes.
Jagged Noise produces sudden changes.
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5 Select the dimensions of the property you want to affect:
One Dimension adds deviations to only one dimension of the selected property.
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Choose the dimension from the menu.
All Dimensions Independently adds a different set of deviations to each dimension.
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All Dimensions the Same adds the same set of deviations to all dimensions.
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6 Set a 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 effects. A value between 0 and 1 creates a keyframe at
intervals of less than one per second. For example, a value of 0.5 creates one keyframe
every 2 seconds.
Using Help | Contents |
Using Property and Tracking Controls (PB only)
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