Apple Shake 4 New Features - Manual (Page 96)

96 Chapter 3 Compositing With the MultiPlane Node
Decreasing the cameraDistance value brings the layer closer to the front of the
composition, while increasing the cameraDistance pushes the layer farther away.
Attached layers move back and forth along the lines that are projected from the
camera itself to the four corners of the frustum surrounding the camera target.
Regardless of how the cameraDistance parameter is set, a layer that’s attached to the
camera always lines up with the locator points imported from its matching .ma file.
Similarly, attached layers always appear, within the camera angle, at their original scale,
regardless of their position in the 3D workspace.
You can attach multiple layers to the camera. A typical example is when you need to
isolate one or more foreground elements in a tracked shot, so that a matchmoved
element can be placed behind it. In the following example, a hot-air balloon is inserted
into a tracked cityscape background plate.
Example: Isolating an Element in a MultiPlane Composite
1 First, duplicate the cityscape image sequence that’s used as the background plate, and
create a rotoshape to isolate the front building.
2 Next, attach the original cityscape image, the isolated building, and the hot-air balloon
images to a MultiPlane node.
They appear within the Images tab as separate layers.
cameraDistance reduced cameraDistance increased