User Manual

Stop Rendering
While points along the polyline are being moved, the results are rendered to the viewer to
provide constant interactive feedback. Although extremely useful, there are situations where
this can be distracting and can slow down performance on a complex effect. To disable this
behavior so renders happen only when the points stop moving, you can toggle the Stop
Rendering button in the toolbar or select this option from the polyline contextual menu.
Roto Assist
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.
There are three main Roto Assist options.
 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.
Chapter – 71 Rotoscoping with Masks 1451