When you switch from the 2D view to the 3D view, your plan does not appear; instead, a blank page is shown.
This is due to problems with your 2D plan as detailed below or due to your roof.
Firstly, if you are stuck on the blank 3D view, double-click on the Wall tool to return to your 2D plan.
Then make the necessary corrections to restore your 3D view.
Roof level error
This problem with switching to 3D view can be caused by the roofing, which is still in beta mode. To check, go to your roof level, select a wall and delete it.
The following message is displayed:
Click Continue and reset roofs. Your wall will remain in place, but the roof will be removed.
Check if you now have access to the 3D view. If not, go to the next step:
Below are the most common errors:
1) Bad join (must be redrawn)
2) Walls divided into several parts (must be redrawn)