This node is created when you create a Paint Effects or toon line modifier ( Paint Effects > Create Modifier; Toon > Create Modifier).
The following lineModifier attributes are available in the Attribute Editor.
Determines the range of effect within the bounds of the modifier. If the dropoff is set to a constant value of 1.0 (horizontal line) then lines will be uniformly modified inside the bounds of the dropoff shape, with a hard transition at the shape edge. If the right edge of the dropoff is instead ramped down to zero the transition will be gradual, with no modulation at the shape edge, and with increasing modulation towards its center. The dropoff graph attribute is defined relative to the shape, such that the right edge of the dropoff is the outer edge of the shape, and the left is the shape’s center.
In order for these settings to have any effect they require that a Paint Effects brush be used with tubes turned on.
Acts as a force pushing tubes away from the center of the line modifier shape. Positive values push away from the center while negative values push towards the center. To have an effect this requires that a brush be used with tubes turned on. For example, use this to push Paint Effects trees as if with the wind.
Acts as a displacement pushing tubes away from the center of the line modifier shape. Positive values push away from the center while negative values push towards the center. This is similar to the force attribute, but tube segments further down the tube are not affected by the offset. To have an effect this requires that a brush be used with tubes turned on.
Can be used to scale the length and width of generated Paint Effects tubes. A value of 1.0 will have no effect and a value of 0.0 scales the tubes to nothing, resulting in no tubes generated. The behavior is similar to modifying the brush’s Global Scale. To have an effect this requires that a brush be used with tubes turned on.