Adobe After Effects CS4 - Manual (Page 494)

488 USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
Termination Threshold Specifies the level at which a path terminates, based on resistance in the atmosphere and
possible alpha collision. At lower values, the path terminates more easily when encountering resistance or alpha
obstacles. At higher values, the path more persistently moves around alpha obstacles.
Note: Increasing Turbulence or Complexity values causes resistance to increase in some areas. These areas change as
conductivity changes. Increasing the Alpha Obstacle value causes resistance to increase at alpha edges.
Main Core Collision Only Calculates collisions only on the main core. The forks aren’t affected. This control is relevant
only if you select Alpha Obstacle.
Fractal Type Specifies the type of fractal turbulence used to create the lightning.
Core Drain Specifies the percentage by which the core strength is drained when creating a new fork. Increasing this
value reduces the opacity of the core where new forks appear. Because forks draw their strength from the main core,
decreasing this value reduces the opacity of the forks as well.
Fork Strength Specifies the opacity of the new fork. This amount is measured as a percentage of the Core Drain value.
Fork Variation Specifies the amount of variation in the opacity of the fork and determines how much the fork opacity
deviates from the amount set for Fork Strength.
Audio Spectrum effect
Apply the Audio Spectrum effect to a video layer to display the audio spectrum of a layer that contains audio (and
optionally video). The effect displays the magnitude of audio levels at frequencies in the range that you define using
Start Frequency and End Frequency. This effect can display the audio spectrum in several different ways, including
along a mask path.
Jerzy Drozda, Jr. provides a demonstration of the Audio Spectrum effect on the Motionworks website .
Note: Audio Spectrum uses the audio source footage without time-remapping, effects, stretch, or levels. To display the
spectrum with such effects, precompose the audio layer before applying the Audio Spectrum effect.
To prevent other masks on the layer from clipping the output of the Audio Spectrum effect, set their mask modes to
None. (See “
Mask modes ” on page 377.)
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Original (upper-left), and with effect applied (lower-left and right)
Audio Layer The audio layer you want to use as input.
Start Point, End Point Specifies the position at which the spectrum starts or ends if Path is set to None.
Path The mask path along which to display the audio spectrum.