Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 197)

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USING AFTER EFFECTS CS4

Layers and properties

Last updated 12/21/2009

Simulate light falloff

Native After Effects lights don’t include falloff properties, which means that the illumination of a layer does not

decrease as the distance between the layer and the light increases.

You can simulate light falloff using expressions or one of several third-party plug-ins created for this purpose.

Dan Ebberts provides an expression on his MotionScript website that uses expressions on the Material Options

properties of a layer to simulate the result of light falloff when the layer is farther from the light.

Online resources about lights

Eran Stern provides a video tutorial on the Creative COW website that demonstrates the use of lights as adjustment

layers, to precisely control which layers are affected by which lights.

Chris Meyer provides a basic overview of lights and their properties in a video tutorial on the Lynda.com website.

Trish and Chris Meyer provide a tutorial for using 3D layers, lights, and cameras in a PDF excerpt from their book

After Effects Apprentice on the

Focal Press website.

Move a camera, light, or point of interest

Camera layers and light layers each include a Point Of Interest property, which specifies the point in the composition

at which the camera or light points. By default, the point of interest is at the center of the composition. You can move

the point of interest at any time.

Before moving a camera, choose a view other than Active Camera so that you can see the point of interest icon and

the boundaries defining its angle.

1 Select a camera or light layer.

2 (Optional) To set the camera or light to ignore the point of interest, choose Layer > Transform > Auto-Orient and

select an option other than Orient Towards Point Of Interest.

3 Using the Selection or Rotation tool, do one of the following:

• To move the camera or light and its point of interest, position the pointer over the axis you want to adjust, and drag.

• To move the camera or light along a single axis without moving the point of interest, Ctrl-drag (Windows) or

Command-drag (Mac OS) the axis.

• To move the camera or light freely without moving the point of interest, drag the camera icon or light icon.

• To move the point of interest, drag the point of interest icon .

Note: As with all properties, you can also modify a camera or light’s position, rotation, and orientation properties directly

in the Timeline panel.

When working with a camera or light layer, create a null object layer and use an expression to link the Point Of

Interest property of the camera or light to the Position property of the null layer. Then, you can animate the Point Of

Interest property by moving the null object. It is often easier to select and see a null object than it is to select and see the

point of interest.

You can also move a camera with the Camera tools. (See “Adjust a camera view or working 3D view” on page 192.)

By default, a camera's wireframe is only visible when the camera is selected. To always show the camera wireframe,

set the view options for the Composition panel (View > View Options). (See “Show or hide layer controls in the

Composition panel” on page 205.)

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