Structural units
Create structural units (e.g. apartments) with name and color, assign or remove rooms, and color and select units in the 3D scene
Overview
Structural units group rooms into logical units independently of the storey structure — typically apartments or usage units, for example as an organizing structure for energy certificates and demand calculations. Each unit has a name and a color; a room can belong to at most one structural unit. The assignment is saved in the project file and serves organization, coloring and selection — it does not change the simulation model.
Access
Mode toolbar to the left of the 3D scene, button 
Structure, then the Building structural units page.
Coloring in the 3D scene
While the page is active, all surfaces (including windows) of the assigned rooms are displayed in the color of their structural unit. Rooms without an assignment appear in neutral dark gray — unassigned rooms are thus immediately recognizable.
Table of structural units
The table lists all structural units of the project with a color field and the column Structural unit (name). A double-click on a row opens the Edit structural unit dialog, in which the name and color can be changed.
Creating a structural unit
Add structural unit opens the Create structural unit dialog:
- Name: — default “Unit” (automatically numbered on a name conflict)
- Color button — default a random color; clicking opens the color picker
After confirming, the new unit appears in the table. It initially contains no rooms.
Removing a structural unit
Remove structural unit deletes the unit marked in the table without a further prompt; the contained rooms and their geometry remain unchanged, they only lose their assignment. The action can be reverted via Edit > Undo.
Assigning rooms
In the Selected rooms area, you assign the rooms currently selected in the 3D scene or in the navigation tree to a unit:
- Select rooms in the scene.
- Mark the target unit in the table.
- Click Assign.
If a room was already assigned to a different structural unit, it is automatically removed there — multiple membership is not possible.
The field Selected structural unit: shows the assignment status of the current room selection:
| Display | Meaning |
|---|---|
| None | No selected room belongs to a structural unit |
| Name [ID] | All selected rooms belong to exactly this unit |
| Room without selected structural unit | At least one selected room has no assignment |
| %1 different templates | The selected rooms are distributed across several units |
Removing an assignment
Remove removes the structural-unit assignment of all currently selected rooms, regardless of which unit they belong to.
Selecting the rooms of a unit
Select selects all rooms of the structural unit marked in the table, including their surfaces, in the 3D scene. This lets you then edit, for example, visibility, usage profiles or other properties for the whole unit.
Good to know:
Assign apartments storey by storey: hide all other storeys via the navigation tree, select the rooms of an apartment with a rectangle selection in the scene and click Assign. Through the coloring, you immediately see which rooms are not yet assigned to any unit — they stay neutral gray.