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Chapter 22: Animating with Constraints and Simple Controllers

FIGURE 22.10
The Linear controller uses straight lines.

Noise controller
The Noise controller applies random variations in a track’s values. In the Noise Controller dialog box,
shown in Figure 22.11, the Seed value determines the randomness of the noise and the Frequency value
determines how jagged the noise is. You also can set the Strength along each axis: The > (greater than) 0
option for each axis makes the noise values remain positive.

FIGURE 22.11
The Noise controller properties let you set the noise strength for each axis.

You also have an option to enable Fractal Noise with a Roughness setting.
The Ramp in and Ramp out values determine the length of time before or until the noise can reach full
value. The Characteristic Graph gives a visual look at the noise over the range. Figure 22.12 shows the
Noise controller assigned to the Position track. If you need to change any Noise properties, right-click the
Noise track and select Properties from the pop-up menu.
Spring controller
The Spring controller is similar in many ways to the Flex modifier in that it adds secondary motion associ-
ated with the wiggle of a spring after a force has been applied and then removed. When the Spring control-
ler is applied, a panel with two rollouts appears. These rollouts, shown in Figure 22.13, let you control the
physical properties of the spring and the forces that influence it.

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