Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 326

Creating a RotoBezier path is similar to creating a manual Bezier path. The primary difference is that direction lines
for vertices and curvature for path segments are automatically calculated.
Create a manual Bezier path using the Pen tool
1 With the Pen tool selected and the RotoBezier option deselected in the Tools panel, click in the Composition panel
where you want to place the first vertex.
Click where you want to place the next vertex. To create a curved segment, drag the direction line handle to create
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the curve that you want.
To reposition a vertex after you've clicked to place it but before you've released the mouse button, hold the spacebar
while dragging.
The last vertex that you add appears as a solid square, indicating that it is selected. Previously added vertices become
hollow, and deselected, as you add more vertices.
Repeat step 2 until you are ready to complete the path.
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4 Complete the path by doing one of the following:
• To close the path, place the pointer over the first vertex and, when a closed circle icon appears next to the
pointer , click the vertex.
Note: You can also close a path by double-clicking the last vertex or choosing Layer > Mask And Shape Path > Closed.
• To leave the path open, activate a different tool, or press F2 to deselect the path.
Draw straight manual Bezier path segments with the Pen tool
The simplest path that you can draw with the Pen tool is a straight line, made by clicking with the Pen tool to create
two vertices. By continuing to click, you create a path made of straight line segments connected by corner points.
Clicking with Pen tool creates straight segments.
Place the Pen tool where you want the straight segment to begin, and click to place a vertex. (Do not drag.)
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2 Click again where you want the segment to end. (Shift-click to constrain the angle between segments at the corner
point to a whole multiple of 45˚.)
Continue clicking to set vertices for additional straight segments.
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Draw curved manual Bezier path segments with the Pen tool
You create a curved path segment by dragging direction lines. The length and direction of the direction lines
determine the shape of the curve.
Shift-drag to constrain the angle of the direction lines to whole multiples of 45˚. Alt-drag (Windows) or Option-drag
(Mac OS) to modify only the outgoing direction line.
1 Place the Pen tool where you want the curve to begin, and hold the mouse button down.
AFTER EFFECTS CS3 320
User Guide