5

• 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 Applying
Image Masks to a Layer.
Important: A mask cannot be applied to a nonflattened 3D group. (To flatten a 3D group,
select the Flatten checkbox in the Group Inspector.) A mask can be applied to a layer in
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. After you draw a
mask, it is nested in the specific layer or group for which it was created, in the Layers list
and Timeline. When a mask is attached to a layer, a mask icon appears to the right of the
name of the layer. Turn the mask display on or off by clicking this icon.
Click the mask 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 Groups and Rasterization.
1197Chapter 20 Using Shapes, Masks, and Paint Strokes