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Objects ➪ b3 ➪ Modified Object ➪ Push ➪ Push Value). Select the Push Value track, and click the
Assign Controller button (or select it from the right-click pop-up menu). From the list of control-
lers, select Float Expression and click OK.
The Expression Controller dialog box opens.
3. In the Expression pane, you should see a single scalar value of 0. Modify the expression to read
like this:
2 * NT
Chapter 35: Animating with the Expression Controller and Wiring Parameters
Click the Debug button to see the value results. With the Expression Debug window open, drag
the Time Slider and notice that the balloon inflates.
Note
If you use a parameter such as Radius as part of an Expression, then the parameter is unavailable in the Modify
panel if you try to change it by hand. n
Figure 35.8 shows the balloon as it is being inflated.
FIGURE 35.8
A balloon being inflated using an Expression controller to control the Push modifier

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