Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 585)

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AFTER EFFECTS CS3

User Guide

580

Example: Animating with the propertyGroup method and propertyIndex attribute

Values of propertyGroup relative to brush stroke’s Position property

A. propertyGroup(4) B. propertyGroup(3) C. propertyGroup(2) D. propertyGroup(1) E. Position’s propertyIndex value is 2; Rotation’s

propertyIndex value is 4.

In this example, each brush stroke’s propertyGroupmethod targets the Brush property group because that group is

two property groups up from the Rotation property. The

propertyIndexattribute in each Brush stroke then returns

a unique value for each Brush stroke. The resulting value is then multiplied by the time and 200 and applied to each

rotation value, rotating each brush stroke differently, creating swirling paint strokes:

propertyGroup(2).propertyIndex * time * 200

Animating a brush stroke with an expression

Key attributes and methods

When you access a Key object, you can get time, index, and value properties from it. For example, the following

expression gives you the value of the third Position keyframe:

position.key(3).value.

The following expression, when written on an Opacity property with keyframes, ignores the keyframe values and

uses only the keyframes’ placement in time to determine where a flash should occur:

d = Math.abs(time - nearestKey(time).time);

easeOut(d, 0, .1, 100, 0)

value Return type: Number or Array.

Returns the value of the keyframe.

time Return type: Number.

Returns the time of the keyframe.

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