When you open the 3D window, an editing plane automatically appears: new elements will be placed onto this editing plane.
If you begin element input by snapping to an existing element hotspot or surface, the editing plane will automatically move to that position.
You can reposition the editing plane manually at any time.
During editing, the editing plane may adjust itself automatically. For example, as you drag this roof ridge, the editing plane automatically becomes the vertical plane on which you drag the cursor.
Editing Plane and 3D Element Input
Relevant topics
Create a Single-plane Roof in the 3D Window
Note: Apart from drawing a new Roof as described below, you can also select a Multi-plane Roof and split it into several Single-plane Roofs, ...
Curtain Wall Input Plane in 3D Window
In the 3D window, the Curtain Wall Info Box provides the following options for defining the Curtain Wall’s input plane:
Default Input ...
Setting the Window/Door Plane in Slanted or Complex Walls
Windows and Doors can be placed in any type of wall, including polygonal, slanted and complex shapes.
If your project contains slanted walls, ...