Page 911 - Kitab3DsMax

Animating with the
Expression Controller
and Wiring Parameters CHAPTER

xpressions are looks that you make in the mirror when you’re trying to
wake up, but in Max they are a series of equations that define how an IN THIS CHAPTER
Eobject acts. Max expressions can be as simple as adding two numbers
together or as complex as several lines of MAXScript. But expressions enable you Using the Numerical
to create customized animated reactions. Expression Evaluator
Although Max expressions can be used with any Max spinner, they are mainly Understanding the Expression
used within MAXScript scripts or in the Expression controller. The Expression controller interface
controller is a specialized controller that lets you control the object’s behavior Learning about operators,
using scripted expressions.
variables, and functions
This chapter then looks at a unique way to drive animations based on object
parameters. Parameters of one object can be wired to parameters of another Wiring parameters with
object so that when one parameter changes, the wired parameter changes with it. manipulator helpers
For example, you can wire the On/Off parameter of a light to the movement of a Collecting parameters
switch. All parameters that can be animated can be wired.
Creating custom parameters
As long as you are working with parameters, Max includes several helpful tools
for viewing and working with the available parameters including the Parameter
Collector. If the Parameter Collector doesn’t gather the exact parameters that you
need, you can create your own custom parameters also.

Working with Expressions in Spinners

Although much of this chapter focuses on using the Expression controller, the
Expression Controller Interface isn’t the only place where you can play with
expressions. Expressions can also be entered into spinner controls using the
Numerical Expression Evaluator, shown in Figure 35.1. This simple dialog box is
accessed by selecting a spinner and pressing Ctrl+N.

Cross-Ref
Another place that commonly uses expressions is the Parameter Wiring dialog
box, which is covered later in this chapter. n

863