Breaklines
Constrain terrain along a line and optionally retain a height difference between its sides.
Break Lines — Constraining the Terrain SurfaceA Breakline constrains the ground along a line. It can blend towards the line or snap more sharply, and can optionally retain a height difference between its sides. It changes the terrain result; it does not automatically build a separate physical wall.
Draw a breakline
Open Model and choose Breakline. Click successive points along the intended line. Use Enter to finish once there are at least two points. Backspace removes the last point. Esc cancels and discards the unfinished line. If numeric input or a snap reference is active, the first Esc clears that input or reference before a further Esc cancels the drawing.
Choose the constraint
Select the resulting line and open Inspector. Constraint type offers Soft (blend) and Hard (snap). Set Edge blend distance to control the transition distance; a sharper constraint is not a guarantee of source survey accuracy.
Retain a height difference when needed
Turn on Retains terrain to expose Drop height (m), Upper side (walking along path) and Blend curve. Left and Right refer to travelling along the point order. Turn Retains terrain off to remove that retaining behavior.
Check the ground
Inspect the terrain from both sides and use contours or a profile to check the result. Length fields follow the project units; explicit entries such as 50 cm or 18 in are accepted by the shared unit fields. Undo reverses recorded edits.