In this page of the online documentation:
There is mentioning of the text:
Select feature lines that comes from lit or shaded regions. Will not affect cast shadow and light contour since they are at the border.
The part that I am questioning is:
Will not affect cast shadow and light contour since they are at the border.
As seen in this example:
Three objects have casted their shadows on the plane and their shadows had been captured and circled. What does the text really saying here, do you know?