Apple Motion 4 - Manual (Page 1132)

You can use one or more masks to punch holes inside shapes using the mask drawing
tools. You can also apply image masks to a shape, which allow you to use any object to
define transparency. For more information on using masks and image masks, see
Using
Masks to Create Transparency .
Shape with a mask set to Subtract Original shape
Applying Filters to Shapes
You can apply filters to shapes, just like any other layer. When you apply a filter to a shape,
it remains editable, even though the filter changes it from a vector-based object into a
bitmapped object in order to perform the operation.
Original shape Shape with filter applied
You can apply filters to individual shapes or to a group that contains a number of shapes.
You can use filters to stylize shapes far beyond the options that are available in the Shape
tab of the Inspector. More importantly, you can use filters in conjunction with the Shape
tab parameters to interactively customize a shape’s look, while preserving the ability to
re-edit the shape at any time.
1132 Chapter 17 Using Shapes, Masks, and Paint Strokes