User Guide

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ADOBE AFTER EFFECTS 5.0
User Guide
Auto Bezier is the default spatial interpolation. To change the default, see “Setting the
default spatial interpolation to Linear” on page 209.
Continuous Bezier interpolation
Like Auto Bezier interpolation, Continuous Bezier interpolation creates a smooth rate of
change through a keyframe. However, you set the positions of Continuous Bezier direc-
tion handles manually. Adjustments you make change the shape of the Value graph or
motion path segments on either side of the keyframe.
If you apply Continuous Bezier spatial interpolation to all keyframes of a motion path,
After Effects adjusts the motion path at each keyframe to create a smooth transition at
each keyframe. As with temporal properties, After Effects maintains these smooth transi-
tions as you move a Continuous Bezier keyframe on the motion path. The speed of motion
along the path is controlled by the temporal interpolation applied at each keyframe.
Bezier temporal interpolation
Bezier interpolation provides the most precise control because you manually adjust the
shape of the Value graph or motion path segments on either side of the keyframe. Unlike
Auto Bezier or Continuous Bezier, the two direction handles on a Bezier keyframe operate
independently in both the Value graph and motion path.
If you apply Bezier temporal interpolation to all keyframes of a layer property, by default
After Effects creates a smooth transition between keyframes. The initial position of the
direction handles is calculated using the same method used in Auto Bezier interpolation.
After Effects maintains existing direction handle positions as you change a Bezier
keyframe value.
Unlike other interpolation methods, you can create any combination of curves and straight
lines along the motion path. Because the two Bezier direction handles operate indepen-
dently, a curving motion path can suddenly turn into a corner at a Bezier keyframe. Bezier
spatial interpolation is ideal for drawing a motion path that follows a complex shape, such
as a map route or the outline of a logo.
Existing direction handle positions persist as you move a motion-path keyframe. The
speed of motion along the path is controlled by the temporal interpolation applied at each
keyframe. For more information on controlling the speed, see“Controlling speed along a
motion path” on page 213.
UG.book Page 203 Wednesday, February 21, 2001 12:05 PM