Adobe After Effects CS3 - Manual (Page 527)

AFTER EFFECTS CS3
User Guide
522
Offset (Turbulence) Determines the portion of the fractal shape that is used to create the roughness.
Complexity Determines the level of detail in the roughness.
Note: Increasing complexity results in longer rendering times. Reduce the Scale value rather than increasing Complexity
to achieve similar results.
Evolution Animating this setting results in changes of the roughness over time.
Note: Although the Evolution value is set in units called revolutions, it’s important to realize that these revolutions are
progressive. The Evolution state continues to progress infinitely at each new value. Use the Cycle Evolution option to
return the Evolution setting to its original state at each revolution.
Evolution Options Evolution Options provide controls that render the effect for one short cycle and then loop it for
the duration of your layer. Use these controls to prerender your roughen elements into loops, and thus speed up
rendering time. Use the following controls to create a smooth, progressive, nonrepeating loop:
• Cycle Evolution Creates a loop that forces the Evolution state to return to its starting point.
• Cycle The number of revolutions of the Evolution setting that the fractal cycles through before it repeats. The
timing of the Evolution cycles is determined by the amount of time between Evolution keyframes.
Note: The Cycle control affects only the state of the fractal, not geometrics or other controls, so you can get different
results with different Size or Offset settings.
• Random Seed Specifies a value from which to generate the roughness texture. Animating this property results in
flashing from one set of fractal shapes to another within the same fractal type. For smooth transition of the
roughness, use the Evolution control.
Note: Create new roughness animations by reusing previously created Evolution cycles and changing only the Random
Seed value. Using a new Random Seed value alters the noise pattern without disturbing the Evolution animation.
Scatter effect
The Scatter effect scatters the pixels in a layer, creating a blurry or smeared appearance. Without changing the color
of each individual pixel, the Scatter effect redistributes the pixels randomly, but in the same general area as their
original positions.
This effect works with 8-bpc and 16-bpc color.
Original (left), and with effect applied (right)
Grain The direction in which to scatter the pixels—horizontally or vertically. Select None to scatter pixels in all
directions.
Scatter Randomness Specifies whether scattering changes at each frame. To animate scattering without keyframes
or expressions, select the Randomize Every Frame option.