Softness Settings
Position field
Displays the relative position of the softness control point in relation to the vertices. For example, if the control point is between the third and fourth vertices, its value is 3.5. Editable.
Offset field
Displays the distance from the softness spline to the mask spline. Editable.
Softness Curve
Displays the transparency distribution of the softness. The y axis represents the percentage of transparency and the x axis represents the percentage of distance from the vertex to the spline. This curve can be animated. You can edit, add and delete points from the curve.
Set Key button
Sets the current values for the softness curve in the current frame(when Autokey is disabled).
Delete Key button
Deletes the selected softness curve keyframes.
Reset Selection box
Select whether to reset all of the softness settings (Reset All) or just the softness curve (Reset Key).
Home button
Resets the softness curve viewer to show the whole curve.
Undo button
Undoes the softness curve operations.