Adobe AFTER EFFECTS 7.0 Manual page 476

Fractals are generated by repeating instances of a noise function derived from the Fractal Type and
Sub Settings
Noise Type. In each instance, the following controls affect how each iteration value is calculated. Complexity deter-
mines the number of iterations that are calculated.
•
Determines how much each iteration influences the final image. This value also affects any subse-
Sub Influence
quent iterations. At 100%, all iterations have the same amount of influence. At 50%, each iteration has half as much
influence as the previous iteration.
•
Scales the coordinates on which the iteration is calculated. When this value is set lower than 100%,
Sub Scaling
each iteration adds more refined details. Setting this value at 50% increases the detail by a factor of two for each
iteration—the same way detail increases when scaling down an image.
•
Rotates each iteration by a degree you set. Sub Offset offsets each iteration by an amount you set.
Sub Rotation
•
Calculates each iteration from the same point as the previous. This can result in the appearance
Center Subscale
of duplicated layers stacked on top of each other. To avoid this type of repetitive fractal look, don't select this control.
Specifies Evolution cycles.
Evolution
Options for Evolution.
Evolution Options
•
Creates a cycle of evolution that loops over the set amount of time. It forces the evolution state to
Cycle Evolution
return to its starting point, creating a smooth progressive cycle, a nonrepeating cycle, or a loop segment.
To ensure that a cycle completes full revolutions, choose a Cycle value that either matches or is evenly divisible by
the number of revolutions set for Evolution.
•
Specifies the number of revolutions that the fractal noise cycles through before it repeats.
Cycle (in Revolutions)
The speed of these Evolution cycles is determined by the amount of time between Evolution keyframes. This option
affects only the evolution of the fractal, not Transform or other controls. For example, if you view two identical states
of a fractal with different Size or Offset settings, they do not appear the same.
Note: Cycle is available only when Cycle Evolution is selected.
•
Sets a unique random value from which to generate the noise. Animating the Random Seed results
Random Seed
in flashing from one set of fractal shapes to another (within that fractal type). For smooth transition of the fractal
shapes use the Evolution option.
You can easily create new fractal noise animations by reusing previously created Evolution cycles and changing only
the Random Seed value. Typing a new Random Seed value alters the noise pattern without disturbing the evolution
animation.
Instead of animating Evolution over the entire composition, save rendering time by pre-rendering and looping one
short evolution cycle for the duration you want.
Specifies the opacity of the noise layer.
Opacity
Specifies an operation between the fractal noise and the original layer. These Blending Modes are
Blending Mode
identical to the ones in the Modes column, with the following three exceptions:
•
Renders the fractal only and does not composite with the original layer.
None
•
Renders the fractal as hue values instead of grayscale. The Saturation and Lightness of the original layer are
Hue
maintained. If the original layer is grayscale, nothing happens.
•
Renders the fractal as saturation values instead of grayscale. The Hue and Lightness of the original
Saturation
layer are maintained. If the original layer is grayscale, nothing happens.
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User Guide