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338 Chapter 12: Animation
2.
In the Motion panel > Parameters > Assign
Controller rollout, select the rotation track in
the list window.
3. Click Assign Controller.
4. Select Noise rotation from the list of controllers.
The Noise Controller dialog automatically
displays.
5. Play the animation.
The box rotates randomly around all three axes.
Inter face
Characteristic Graph—Shows a stylized graph of
how changing Noise proper ties affects the Noise
cur ve.
Seed—Starts the noise calculations. Changing the
seed creates a new curve.
Fr equ e n cy—Controls the peaks and valleys of the
noise curve. The useful range is from 0.01 to 1.0.
High va lues create jagged, heavily oscillating noise
cur ves. Low values create soft, gentle noise curves.
Strength f ields—Setsthevaluerangefornoise
output. These va lues can be animated.
The number and meaning of the fields vary with
different parameter data types. Some typical field
arrangements are:
• XYZ fields for Position and Point3 keys
• XYZ percentage fields for Scale keys
• A single value field for Float keys
>0 Value constraint—Forces Noise values to stay
positive. Each streng th field has its own >0
constraint.
When on, the application of the Strength field is
changed. Noise values w i ll r ange from 0 to the
value of Strength; most values will hover around
Strength/2.
Ramp In—Sets the amount of time Noise takes to
build to its full strength. A value of 0 causes Noise
to start immediately at full strength at the start of
its range. Any other v alue causes Noise to start at
0 strength and then build to full strength by the
elapsed time set in the Ramp In field.
Ramp Out—Sets the amount of time Noise takes
to fall to 0 strength. A value of 0 causes Noise to
stop immediately at t he end of its range. Any othe r
value c auses Noise to fall off to 0 st rength by the
end of its range. The value in the Ramp Out field
setstheamountoftimebeforetheendoftherange
that Noise begins to fall off.
Fr act al Nois e —Generatesnoiseusingafractal
Brownian motion. The main value of using Fractal
NoiseisthatitactivatestheRoughnessfield.
Roughness —ChangestheroughnessoftheNoise
cur ve (when Fractal Noise is turned on). Where
Frequency sets the smoothness of the over a ll Noise
effect, Roughness changes t he smoothness of the
Noise curve itself.