255

Composited group 3D motion

1.Click the Make Compositing Child button () on the tracks you want to group to create a compositing group. For more information, see Understanding the parent/child track relationship on page 248.

2.Click the Parent Composite Mode button () on the parent track and choose

3D Source Alpha.

3.Click the Parent Motion button () on the parent track. The Track Motion window is displayed.

Parent track motion affects the parent track and all child tracks.

In the sample track list to the right, parent track motion on track 1 will affect tracks 1 through 6.

Parent track motion applied to track 4 will affect only tracks 4 through 6.

4.Choose a setting from the Layout drop-down list to choose the workspace display you want to use. The Layout setting allows you to see your track from various points of view.

5.Adjust the selection area to change the viewable area of the track and its position in space. Guides are displayed in bold to indicate how the track will be moved or rotated:

Moving closer to or farther

Dragging the track.

Rotating left to right

Rotating forward or

Rotating around the

from viewer. Drag across

 

around the Y axis.

backward around the

the Z axis.

corners to flip the track.

 

 

X axis.

 

6.Use the buttons at the top of the dialog to allow or prevent movement or scaling. For more information, see Changing editing options on page 256.

Tip: Right-click the workspace to display a shortcut menu that displays commands to restore, center, or flip the selection box. You can also force the box to match the source media's aspect ratio or your project's output aspect ratio. Matching the output aspect ratio can prevent black bars from appearing when you use source media that does not match your project's aspect ratio.

7.The 3D track motion occurs instantly, and the results are updated in the Video Preview window.

8.Use the keyframe controller at the bottom of the Track Motion window to establish distinct track motion settings throughout the duration of the track.

During playback, immediate frames are interpolated to create smooth motion. Expand the Keyframe interpolation heading on the left side of the window and drag the Smoothness slider to adjust the interpolation. For more information, see Using keyframe animation on page 273.

CHP. 14

USING VIDEO FX, COMPOSITING, AND MASKS