Adobe After Effects CS4 Bedienungsanleitung PDF herunterladen (Seite 315)

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USING AFTER EFFECTS CS4

Drawing, painting, and paths

Last updated 12/21/2009

More Help topics

“Creating shapes and masks” on page 312

“Add, edit, and remove expressions” on page 647

About shapes and shape layers

Shape layers contain vector graphics objects called shapes. By default, a shape consists of a path, a stroke, and a fill. (See

“About paths” on page 307 and “Strokes and fills for shapes” on page 333.)

You create shape layers by drawing in the Composition panel with the shape tools or the Pen tool. (See “Creating

shapes and masks” on page 312.)

Shape paths have two varieties: parametric shape paths and Bezier shape paths. Parametric shape paths are defined

numerically, by properties that you can modify and animate after drawing, in the Timeline panel. Bezier shape paths

are defined by a collection of vertices (path points) and segments that you can modify in the Composition panel. You

work with Bezier shape paths in the same way that you work with mask paths. All mask paths are Bezier paths.

You can modify a shape path by applying path operations, such as Wiggle Paths and Pucker & Bloat. You apply a stroke

to a path or fill the area defined by a path with color by applying paint operations. (See

“Shape attributes, paint

operations, and path operations for shape layers” on page 333.)

Shape paths, paint operations, and path operations for shapes are collectively called shape attributes. You add shape

attributes using the Add menu in the Tools panel or in the Timeline panel. Each shape attribute is represented as a

property group in the Timeline panel, with properties that you can animate, just as you do with any other layer

property. (See

“About animation, keyframes, and expressions” on page 210.)

The color bit depth of a shape layer is the same as the project as a whole: 8, 16, or 32 bpc. (See “Color depth and high

dynamic range color” on page 274.)

Shape layers are not based on footage items. Layers that are not based on footage items are sometimes called synthetic

layers. Text layers are also synthetic layers and are also composed of vector graphics objects, so many of the rules and

guidelines that apply to text layers also apply to shape layers. For example, you can’t open a shape layer in a Layer panel,

just as you can’t open a text layer in a Layer panel.

You can save your favorite shapes as animation presets. (See “Save an animation preset” on page 388.)

More Help topics

“Creating shapes and masks” on page 312

“Best practices for creating text and vector graphics for video” on page 342

Online resources for shape layers

For a video tutorial introducing shape layers, visit the Adobe website at www.adobe.com/go/vid0224.

Trish and Chris Meyer provide an introduction to shape layers in a PDF excerpt from the “Shape Layers” chapter of

their book

Creating Motion Graphics with After Effects (4th Edition).

Trish and Chris Meyer also provide a video introduction to shape layers on the ProVideo Coalition website.

You can download additional animation presets that take advantage of per-character 3D text animation from the After

Effects Exchange on the Adobe website.

Chris Zwar provides an animation preset on his website that creates a target cross-hair using a single shape layer, with

a wide variety of custom properties that make controlling and modifying the cross-hair animation easy and obvious.

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