Apple Motion 5.1.1 - Manual (Page 906)

Chapter 20 Shapes, masks, and paint strokes 906
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When a transformed (scaled, rotated, or anchor point-adjusted) shape is converted to a mask,
the transforms are not maintained.
Convert a shape to a mask on an image
1 Use any of the shape tools to create a shape (or draw a paint stroke).
Note: You can also add a preset shape from Shapes category in the Library.
2 In the Layers list, drag the shape object onto the layer to be masked.
The shape is converted into a mask. If the layer to which the mask is applied is not centered
in the Canvas, the position of the mask is slightly offset. This is because the position of the
converted mask is dependent upon the original position of the shape relative to the center of its
parent group.
Convert a shape to a mask on a group
1 Use any of the shape tools to create a shape (or draw a paint stroke).
2 In the Layers list, drag the shape onto the group layer and pause, holding down the mouse
button. When the drop menu appears, choose Move Mask To Group.
Convert a shape to a mask on the enclosing group
1 Use any of the shape tools to create a shape (or draw a paint stroke).
2 In the Layers list, select the shape object and do one of the following:
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Drag the shape onto the group layer and pause, holding down the mouse button. When the
drop menu appears, choose Move Mask To Group.
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Choose Object > Convert Shape to Mask.
Convert a shape to a mask on another shape
1 Use any of the shape tools to create a shape (or draw a paint stroke).
2 In the Layers list, drag the shape object onto another shape object and pause, holding down the
mouse button.
A drop menu appears.
3 Choose Add Mask To Shape.
The shape is converted into a mask on the other shape.
Note: Spline masks are not applicable to 3D paint strokes. The Local 3D checkbox must be
deselected in the Stroke pane of the Shape Inspector for the drop menu to appear.
Convert a shape to a mask on a particle emitter or replicator
1 Use any of the shape tools to create a shape (or draw a paint stroke).
2 In the Layers list, drag the shape object onto an emitter or replicator and pause, holding down
the mouse button.
A drop menu appears.
3 Choose Add Mask To Emitter or Add Mask to Replicator.
The shape is converted into a mask on the particle emitter or replicator.
Note: The 3D checkbox must be deselected in the Emitter or Replicator Inspector for the drop
menu to appear.
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