ADOBE AFTER EFFECTS 7.0
User Guide
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Offset (Turbulence) Specifies the portion of the fractal shape that is present in the Composition panel, altering the
shape of the distortion on your layer. Because the fractal shapes used are infinite in all directions, what appears in
the Composition panel is only a small portion of the entire fractal. The Composition panel behaves like a fixed
viewing area, and the Offset control repositions the fractal within that view, which then brings a different portion of
the fractal into view. This alters the shape of the distortion.
Complexity Specifies the level of detail in the turbulence. Increasing the Complexity value increases the detailed
definition in the displacement pattern. Lower values result in smoother distortions.
Evolution Specifies the changes of the turbulence over time. Evolution values are progressive, not looping. The
image continues to change with each added revolution. The appearance of the image when this option is set to 0 is
different from that at 1 revolution, which, in turn, is different from that at 2 revolutions, and so on. The evolution
state progresses infinitely at each new value. To force the Evolution setting to return to its original state (necessary
to create a seamless loop) set the Evolution Options control to Cycle Evolution.
SetkeyframesforEvolutiontodeterminehowmuchtheturbulenceevolvesovertheperiodoftimeallowedbetween
keyframes. The more revolutions that are made between keyframes, the more rapidly the turbulence changes. Higher
values may result in flashing rather than smooth changes.
Evolution Options Specifies how the effect’s evolution values are rendered. This control is useful to create one short
seamless evolution cycle (where the last frame matches up to the first) to be prerendered and looped as a new source
layer in a composition, rather than setting Evolution to animate over a greater number of frames. Options include
the following:
• Cycle Evolution Creates a cycle of evolution that loops over a set amount of time. Cycle Evolution returns the
evolution state to its starting point to create a smooth, progressive, looping animation. Copied and pasted evolution
keyframes start and end with the same value, and the resulting animation repeats, rather than producing a smoothly
transitioning cycle.
• Cycle Specifies the number of revolutions of the Evolution setting that the fractal noise cycles through before it
repeats. The amount of time allowed between evolution keyframes determines the timing or speed of these evolution
cycles. Higher values create longer render times. Cycle affects only the state of the fractal, not geometrics or other
controls. For example, two identical states of the fractal don’t appear the same if viewed with different Size or Offset
settings.
• Random Seed Specifies a unique random value from which to generate the turbulence. Animating the random
seed value results in flashing from one set of fractal shapes to another within that fractal type. For smooth transition
of the turbulence, use the Evolution control.
Pinning Specifies how the effect pins the edges of an image so that it remains in its initial position. The None option
pins no layer edges. Pin All, Pin Horizontal, and Pin Vertical minimize the effect of the turbulence on the corre-
sponding layer edges. All Locked Options locks the layer edge so that turbulence doesn’t affect it.
Resize Layer Enables the distorted image to expand past the layer’s bounding box.
Antialiasing For Best Quality Specifies the level of anti-aliasing of the displacement pattern. This control works best
if the layer is set to Best quality in the Timeline panel.
To create a seamless loop using Turbulent Displace
1
Set two keyframes for the Evolution control, using full revolutions only.
2 Adjust the time allowed between keyframes, and the number of Evolution revolutions until you are satisfied with
the appearance of the displacement.
3 Under Evolutions Options, select Cycle Evolution.
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