Apple Motion 3 - Manual (Page 1091)

Chapter 12 Using Shapes and Masks 1091
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.
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.
Inactive Isolate button