9

354 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
opens.
5. Play the animation.
The bo x rotates randomly around all three axes.
Because the non-modal Noise Controller dialog
is st i l l open, you can adjust parameters and see
the results in real time.
Inter face
Characteristic Graph—Shows a stylized g r aph of
how changing Noise properties affects the Noise
cur ve.
Seed—Starts the noise ca lculations. Changing the
seed creates a new curve.
Fr eque n cy—Controls the peaks and valleys of the
noise curve. The useful range is f rom 0.01 to 1.0.
High values create jagged, heavily osci llating noise
cur ves. Low values create sof t, gentle noise curves.
Strength fields—Setsthevaluerangefornoise
output. These values can be animated.
The number and meaning of the fields vary with
different parameter data ty pes. Some typical field
arrangements are:
• XYZ fields for Position and Point3 keys
• XYZ percentage fields for Scale keys
• A single va lue field for Float keys
>0 Value constraint—Forces Noise values to stay
positive. Each strength field has its own >0
constraint.
When on, the application of the Strength field is
changed. Noise values w ill range from 0 to the
value of Strength; most va lues will hover around
Strength/2.
Ramp In—Sets the amount of time Noise t akes 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 value causes Noise to start at
0 strength a nd then build to full strength by the
elapsed time set in the Ramp In field.
Ramp Out—Sets the amount of time Noise t a kes
to fall to 0 strength. A value of 0 causes Noise to
stop i mmediately at the end of its r ange. Any other
value causes Noise to fall off to 0 strength by the
end of its range. The value in the Ramp Out field
setstheamountoftimebeforetheendoftherange
that Noise begins to fall off.
Fr actal N o ise —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 overa ll Noise
effect, Roughness changes t he smoothness of the
Noise c urve itself.