Apple Motion 4 - Manual (Page 1161)

To isolate a layer
1 In the 3D project, select the layer that you want to mask. In this example, the center
leopard image is the layer to be masked.
The Isolate button appears to the right of the layer name.
Note: A project must contain a camera in order to access the Isolate option.
2 Click the Isolate button or choose Object > Isolate.
Inactive Isolate button
Note: You can also Control-click the layer or group and choose Isolate from the shortcut
menu.
The layer is switched into “work view,” allowing you to mask the layer at its original
orientation.
1161 Chapter 17 Using Shapes, Masks, and Paint Strokes