Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 313)

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USING AFTER EFFECTS CS4

Drawing, painting, and paths

Last updated 12/21/2009

Aharon Rabinowitz’s “What are Raster and Vector Graphics?” video tutorial—part of the Multimedia 101 series on the

Creative COW website—provides a general introduction to raster images and vector graphics.

More Help topics

“Continuously rasterize a layer containing vector graphics” on page 158

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

“About text layers” on page 341

“About paths” on page 307

“About shapes and shape layers” on page 309

About paths

Several features of After Effects—including masks, shapes, paint strokes, and motion paths—rely on the concept of a

path. Tools and techniques for creating and editing these various kinds of paths overlap, but each kind of path has its

own unique aspects.

A path consists of segments and vertices. Segments are the lines or curves that connect vertices. Vertices define where

each segment of a path starts and ends. Some Adobe applications use the terms anchor point and path point to refer to

a vertex.

You change the shape of a path by dragging its vertices, the direction handles at the end of the direction lines (or

tangents) of each vertex, or the path segment itself.

As a path exits a vertex, the angle and length of the outgoing direction line for that vertex determine the path. As the

path approaches the next vertex, the path is less influenced by the outgoing direction line of the previous vertex and

more influenced by the incoming direction line of the next vertex.

Components of a path

A. Selected vertex B. Selected vertex C. Unselected vertex D. Curved path segment E. Direction line (tangent) F. Direction handle

Paths can have two kinds of vertices: corner points and smooth points. At a smooth point, path segments are connected

as a smooth curve; the incoming and outgoing direction lines are on the same line. At a corner point, a path abruptly

changes direction; the incoming and outgoing direction lines are on different lines. You can draw a path using any

combination of corner and smooth points. If you draw the wrong kind of point, you can change it later.

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