Apple Motion 3 - Manual (Page 1090)

1090 Chapter 12 Using Shapes and Masks
After you’ve finished drawing the mask, its effect is immediate, and the mask you
created appears nested underneath the layer to which it’s applied in the Layers tab and
Timeline.
You can create multiple masks for a single layer. To add additional masks, select the
object again, then follow the above procedure. By default, all new masks are set to the
Add blend mode. You can change the Mask Blend Mode parameter in the Inspector to
combine masks for different effects. For more information about using multiple masks
together, see “
Combining Multiple Masks ” on page 1096.
Masking Objects in a 3D Project
When working in a 3D project, you may want to mask a layer once it has been
transformed or the camera has been rotated. You can immediately switch a
transformed object into a “work view” using the Isolate button in the Layers tab or
Timeline layers list, or the Isolate command in the Object menu. Once a camera is
added to a project, the Isolate option is available for any layer, group, or camera in the
project.
Note: Masks can be applied to the layers within a 3D group, but not the 3D group itself
(unless you’ve activated the Flatten checkbox in the Group tab of the Inspector). For
more information about the Flatten checkbox, see “
Inspector Tabs ” on page 131.