Add 1 more plane to differentiate the area of the clip volume where to show hidden lines and an area after where the hidden lines are off. It is very common to show the hidden lines of the objects that are just a few meters (3-4 m) after the cutting plane, and at the same time, show the visible objects that are further away from the cutting plane (some times more than 20 meters).With the current tools that's only possible by overlapping two clip volumes with different hidden line settings anddifferentdepths. That represents doublethe work, more info to be managed and slower drawing files to work with.