Apple Motion 5.1.1 - Manual (Page 890)

Chapter 20 Shapes, masks, and paint strokes 890
Mask a layer
1 Select a layer in the Canvas or Layers list.
2 Choose a mask drawing tool from the pop-up menu in the toolbar (the Rectangle Mask tool, the
Circle Mask tool, the Freehand Mask tool, the Bezier Mask tool, or the B-Spline Mask tool).
Note: If you haven’t selected a layer, the mask tools are not available.
3 Begin drawing the shape to mask the layer.
In the example below, a Bezier mask is used. For more information about how to draw and edit
shapes, see
Bezier shapes and B-Spline shapes overview on page 832.
4 When you’re done, you can finish the mask by doing one of the following:
•
Click the first point to close the mask.
•
Press C to close the mask, joining the first point you created to the last.
•
Double-click to close the mask, joining the first point you created to the last.
•
Press Return to close the mask, joining the first point you created to the last.
•
When using the Freehand Mask tool, join the end of the mask to the target circle at the
beginning of the mask. If you don’t reach the beginning of the mask, the mask shape is closed
when you lift the stylus or release the mouse button.
Note: Unlike standard shapes, masks are always closed.
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