After selecting the range you want the effect to take place, you then click on a piece of ground you want to use as a reference for leveling out a hill or build-up a valley. And by continuing holding down your left mouse key, you then move around to produce the leveling you want.
But...
In my case, with the new RW3, clicking on level ground produces a huge gigantic hole!!!!
Anybody else having this problem?

ON EDIT: Oh, I see the the height tool in clicked on! Unclicking it returns leveling to normal, but...The height tool, when activated, should produce an increase in height by the selected value, not deep chasms...
