Trim, Cut & Copy
Split surfaces along a trim plane, clip rooms and copy surfaces, windows, rooms, storeys and buildings
Trim & Cut
Invoking
Toolbar mode 
Trim (visible only in the Building workspace). The Clip/trim geometry panel displays a trim plane in the scene against which selected geometry is split.
Positioning the trim plane
- Input fields X / Y / Z (in m) — absolute position of the plane in world coordinates.
- Local offset adjustment — offset along the local axes.
- Rotate — rotation of the plane normal about the local X, Y or Z axis in °.
- Align plane with the axis buttons X / Y / Z — sets the plane perpendicular to the respective local axis.
- Additionally, the plane can be aligned to a surface by clicking that surface in the scene.
Cut selected geometry
Cut selected geometry splits all selected surfaces along the trim plane into independent partial surfaces. Windows/sub-surfaces and holes of the surfaces are cut along and assigned to the respective correct new parent surfaces. A progress dialog (Clipping) accompanies the operation; the result is a single undo step (“Clipping performed.”). Typical use: splitting a continuous façade surface at a storey ceiling.
Trim selected room
Trim selected room clips entire selected rooms at the trim plane: surfaces on the normal side of the plane are removed, cut surfaces are shortened to the remaining side, and the resulting opening is closed with a new separating surface. Rooms with all subordinate surfaces must be selected.
Simple rooms (floor polygon + extrusion height) cannot be trimmed or cut directly. In a prompt the program offers to first convert them automatically to complex geometry (dialog “Convert simple rooms?”); the operation then continues.
Copy
Invoking
Toolbar mode 
Copy (Building workspace only). Panel Copy selected geometry.
Copy with offset
The ΔX/ΔY/ΔZ fields (default 0 / 0 / 3 m) give the copy offset — interpreted along the axes of the local coordinate system. Copying is done via the type-specific buttons, depending on which object level is to be duplicated:
| Button | copies |
|---|---|
| Surfaces | selected surfaces (incl. their windows) |
| Windows/doors | selected sub-surfaces within their parent surface |
| Rooms | selected rooms with all surfaces and component assignments |
| Storeys | selected storeys with all rooms |
| Buildings | selected buildings completely |
Each copy operation is its own undo step.
Place interactively (Ctrl+D)
Place interactively (Ctrl+D) starts the interactive duplication mode — equivalent to the Ctrl+D keyboard shortcut directly in the 3D scene: click the origin point, drag the copy with the mouse to the target location (axis locks and snapping apply) and place it with a click.
The Copies: spin box determines the number of copies in a linear arrangement (row with the same offset); it is only active during interactive duplication. Shift+mouse wheel in the 3D view also changes the copy count, and the ghost preview of the row is updated live.
Good to know:
Multi-storey buildings are created fastest from a cleanly modeled standard storey: select the storey, set the copy offset ΔZ to the storey height and duplicate with “Storeys” — or drag upward interactively with Ctrl+D and turn up the copy count via Shift+mouse wheel. Afterwards check the rooms in the storey management.