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X Y Z Rotation
The path can be rotated in all three dimensions to allow for sophisticated controls.
Displacement
Every motion path has an associated Displacement spline in the Spline Editor. The Displacement
spline represents the position of the animated element along its path, represented as a value between
0.0 and 1.0. Displacement splines are used to control the speed or acceleration of an object’s
movement along the path.
To slow down, speed up, stop, or even reverse the motion of the control along the path, adjust the
values of the points for the path’s displacement in the Spline Editor or in the Inspector.
– A Displacement value of 0.0 in the Spline Editor indicates that the control is at the very beginning
of a path.
– A value of 1.0 indicates that the control is positioned at the end of the path.
– Each locked point on the motion path in the viewer has an associated point on the Displacement
spline.
– Unlocked points have a control point in the viewer but do not have a corresponding point on the
Displacement spline.
Heading Offset
Connecting to the Heading adjusts the auto orientation of the object along the path. For instance, if a
mask’s angle is connected to the path’s heading, the mask’s angle will adjust to follow the angle
of the path.
Right-Click Here for Shape Animation
It’s possible to animate the shape of the path as well or to connect it to other path controls like Polyline
Masks or Paint Strokes.
TIP: Switching Default Paths
You can change the default path type used when animating a position or center control to a
path (if this is the preferred type of animation). Open the Preferences window and select the
Global Settings. In the Default category, select the Point With menu and choose Path. The
next time Animate is selected from a Position or Center control’s contextual menu, a
path is used.
Perturb
The Perturb modifier generates smoothly varying random values for a given parameter based on
Perlin noise. It can be used to add jitter, shake, or wobble to any animatable parameter, even if the
parameter is already animated. Its results are similar to those of the Shake modifier, although it uses a
different set of controls that may be more intuitive. Unlike other random modifiers, you can apply the
Perturb modifier to polylines, shapes, grid meshes, and even color gradients.
For example, to add camera shake to an existing path, right-click the crosshair and choose Insert >
Perturb, and then adjust the Strength down to suit. Alternatively, right-clicking the path’s “Right-click
here for shape animation” label at the bottom of the Inspector lets you apply perturb to the path’s
polyline. This works best if the polyline has many points—for example, if it has been tracked or
hand-drawn with the Draw Append pencil tool. A third usage option is to use the Insert contextual
menu to insert the modifier onto the Displacement control. This causes the motion along the path to
jitter back and forth without actually leaving the path.
Chapter 121Modifiers 2458
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