Creating a reference
to cut, click where you want the cut to start with the right mouse button.
click again where you want the cut to continue, with the right mouse button.
now left click to cancel the cut. right click where you want your new cut to start, then right click where you want it to
continue. left click again to cancel cut, and left click again to stop the cutting.
1 click = stop cut.
2 clicks = stop cutting.
