Apple Motion 5.1.1 - Manual (Page 892)

Chapter 20 Shapes, masks, and paint strokes 892
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.
3 To return to your previous view (the view before you isolated the layer), click the Isolate
button again.
Active Isolate button
Note: Clicking a camera’s Isolate button activates that camera’s view.
Combine multiple masks
Often you may find that it is impossible to create the mask shape you need using only a single
mask. For example, when masking something that has a hole in it, you need at least two masks—
one set to Add to mask the overall object, and a second one set to Subtract to cut the necessary
hole in the middle of it. In the following example, the only way to mask the space between the
diver’s arms and legs is to create three overlapping masks set to Subtract.
Original object Three overlapping masks Result
67% resize factor