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A double polyline uses an inner and outer shape for non-uniform softness
Converting a Single Polyline to a Double Polyline
To convert a mask into a double polyline, click the Double Polyline button in the Polyline toolbar or right-click in the viewer and select Make Outer Polyline from the mask’s contextual menu.
The shape will be converted into an inner and an outer polyline spline. Both polylines start with exactly the same shape as the original single polyline. This keeps the mask sharp to start with and allows any animation that may have already been applied to the shape to remain.
Make Double Polyline button