You can select a
TERRACE-function from the context-menu.
terrace up:
click and hold on a face to get its highest point as a reference for following faces and move the mouse.
all faces become flat at the defined height
terrace down:
like terrace-up, but flattening at the lowest point of the start-face
terrace-avarage
for mostly unregular results (natural terrains):
terrace-fixed
enter absolute height for the face you "brush"-over
or
BRUSH
flow:
simply hold down the left mouse and move across edges/faces
move more times to become a 'unregular flowing structure'
approx
like flow, but with a different algorithm