Precomposing layers

Adjusting the layers and creating a track matte

Previewing the animation

Now, see how it all comes together.

1 Press the Home key, or go to 0:00.

2 Press F2 or click an empty area in the Timeline panel to deselect everything, and then press the spacebar to preview the animation. The sun rises in the sky, the birds fly by (very quickly), and the clouds drift. So far, so good! However, there’s a fundamental problem: These elements all overlap the window frame—the birds even appear to be flying inside the room. You’ll solve this next.

3 Press the spacebar to stop playback.

4 Hide the Clouds layer’s properties, and then choose File > Save.

To solve the problem of the sun, birds, and clouds overlapping the window frame, you must first adjust the hierarchy of the layers within the composition, and then you will use an alpha track matte to allow the outside scenery to show through the window, but not appear to be inside the room.

You’ll start by precomposing the Sun, Birds, and Clouds layers into one composition.

1 Shift-click to select the Sun, Birds, and Clouds layers in the Timeline panel.

2 Choose Layer > Pre-compose.

3 In the Pre-compose dialog box, name the new composition Window Contents.

Make sure the Move All Attributes Into The New Composition option is selected, and select Open New Composition. Then click OK.

A new Timeline panel named Window Contents appears. It contains the Sun, Birds, and Clouds layers you selected in step 1 above. The Window Contents composition also appears in the Composition window.

4 Click the Sunrise Timeline panel to see the contents of the main composition. Notice that the Sun, Birds, and Clouds layers have been replaced by the Window Contents layer, which refers to the Window Contents composition.

Дата добавления: 2014-11-20