Apple Motion 4 - Manual (Page 1159)

To mask a layer
1 Select a layer in the Canvas or Layers tab.
2 Choose a mask drawing tool (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 you need in order to mask the layer.
For more information about how to draw and edit shapes, see Shape and Mask Drawing
Tools .
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.
1159 Chapter 17 Using Shapes, Masks, and Paint Strokes