Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 167)

AFTER EFFECTS CS3

User Guide

162

You can use Brainstorm on any property that has numeric values or options in a pop-up menu in the Timeline panel.

Examples of properties on which you can’t use Brainstorm are Source Text, Mask Path, and the Histogram property

for the Levels effect; however, you can use Brainstorm on the properties of the Levels (Individual Controls) effect.

Brainstorm operates on all selected keyframes. For a property with no keyframes, Brainstorm operates on the global,

constant value.

If you use Brainstorm on a single one-dimensional property (such as Opacity, but not Position), the Randomness

value that controls the amount of variation (mutation) is replaced by a Spread value. The variants that are presented

in the Brainstorm dialog box are then not random, but represent a range of values around the central value. The

original composition appears in the center tile of the dialog box, and you can only select one variant on which to base

the next Brainstorm operation.

Though you can’t directly use Brainstorm on expressions, you can use Brainstorm on the properties of Expression

Control effects, to which expressions can refer.

1 Set a work area and region of interest for the duration and spatial area of the composition that you want to preview

during the Brainstorm session. (See “Set the work area” on page 112 and “Work with the region of interest” on

page 111.)

2 Select one more properties or property groups in the Timeline panel, and click the Brainstorm button at the

top of the Timeline panel.

The variant compositions all play in the Brainstorm dialog box simultaneously. Controls for each variant are only

visible when the pointer is over it. Use the playback controls at the bottom of the Brainstorm dialog box to play,

pause, or rewind the previews.

3 In the Brainstorm dialog box, do any of the following:

• To get a better look at a variant, click its Maximize Tile button. Click the Restore Tile Size button to return

to the grid view of all variants.

• To show or hide the transparency grid, click the Toggle Transparency Grid button at the bottom of the Brain-

storm dialog box.

• To mark a variant for inclusion in the next Brainstorm operation, click that variant’s Include In Next Brainstorm

button.

• To save a variant as a new composition in the current project, click that variant’s Save As New Composition

button.

• To increase the randomness or spread for the next generation, adjust the Randomness or Spread value at the

bottom of the Brainstorm dialog box. Make this number small for precision work; make it larger for experimen-

tation and exploration.

4 (Optional) To create another generation of variants from those marked for inclusion in the next Brainstorm

operation, click Brainstorm at the bottom of the Brainstorm dialog box and return to step 2. If you click Brainstorm

without marking any variants for inclusion, the Brainstorm operation is repeated using the same input as the current

generation.

If the Brainstorm operation uses Randomness, the variants marked for input into the next generation are included

unchanged into the next generation, and remain in their positions in the dialog box. If the Brainstorm operation uses

Spread, only one variant is carried into the next generation, and it appears in the center tile.

Repeat this cycle until you have found the variant that you want to save as the current composition.

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Adobe After Effects CS3 Manual de usuario Pagina 167

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