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You can enable the Roto Assist button in the toolbar when you begin drawing your shape to have points snap to the closest high-contrast edge as you draw the shape. The points that have snapped to an edge are indicated by a cyan outline.
— Multiple Points: Allows adding multiple points along an entire edge with a single click instead of having to add each point individually.
— Distance: Defines the pixel range within which searching for an edge will take place.
— Reset: Used for resetting the snap attribute of the snapped points. After resetting, the points will become unavailable for tracking.
The Roto Assist options in the toolbar
Creating Softness Using Double Polylines
The standard soft edge control available in all Mask nodes softens the entire mask equally. However, there are times, particularly with a lot of motion blur, when softening part of the curve while keeping other portions of the curve sharp is required.
This form of softness is called non-uniform softness, which is accomplished by converting the shape from a single polyline to a double polyline. The double polyline is composed of two shapes: an inner and an outer shape. The inner shape is the original shape from the single polyline, whereas the outer shape is used to determine the spread of the softness. The further the outer shape gets from the inner shape, the softer that segment of the shape becomes.
