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The Draw Append mode creates a freehand polyline shape directly on the viewer, like drawing with a pencil or a paintbrush. This mode is ideal to use in conjunction with a tablet and for the creation of garbage mattes and effect masks around complex shapes.
The Draw Append toolbar button (Shift-D)
Protection Modes
In addition to the modes used to create a polyline, two other modes are used to protect the points from further changes after they have been created.
Modify Only
Modify Only mode allows existing points on the polyline to be modified, but new points may not be added to the shape.
TIP: Even with Modify Only selected, it is still possible to delete points from a polyline.
TIP: Even with Modify Only selected, it is still possible to delete points from a polyline.
TIP: Even with Modify Only selected, it is still possible to delete points from a polyline.
The Modify Only toolbar button (Shift-M)
Done
The Done mode prohibits the creation of any new points, as well as further modification of any existing points on the polyline.
The Done toolbar button (Shift-N)
Closing Polylines
There are several ways to close a polyline, which will connect the last point to the first.