Apple Motion 4 User Manual
Page 1158
• Freehand Mask (used like the Paint Stroke tool)
• Bezier Mask
• B-Spline Mask
Note: You can also use an Image Mask to mask a layer. For more information, see
Important:
A mask cannot be applied to a nonflattened 3D group. (To flatten a 3D group,
select the Flatten checkbox in the Group tab of the Inspector.) A mask can be applied to
a layer within a 3D group. To add a mask to a layer that has been manipulated in 3D
space, use the Isolate button. Masks cannot be manipulated in 3D space. For example,
the Position parameter for a mask only includes the X and Y position parameters, but not
the Z position parameter; the Rotation parameter only includes Z, but not X or Y. For
more information, see
Masking Objects in a 3D Project
.
Drawing and editing masks using these tools works identically to drawing and editing
shapes. The main difference is that while drawing a shape creates a new layer in your
project, masks must be drawn on top of another layer in your project. Once drawn, masks
are nested within the specific layers or groups for which they were created, in the Layers
tab and Timeline. Once a mask is attached to a layer, a Masks icon appears to the right
of the name of the layer. Turn the mask display on or off by clicking this icon.
Click the Masks icon
to turn mask display
on or off.
Note: Masks created for one layer can be copied or moved to other layers.
Important:
When a mask is applied to a 2D or flattened 3D group, the group is rasterized.
For more information, see
.
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Chapter 17
Using Shapes, Masks, and Paint Strokes