The walls in my model are visible in plan view and I can select them and open their specification dialog, but when I create 3D camera views, they are not visible. How do I correct this?
There are several reasons why walls that are visible in a plan view might not be visible in 3D camera views: the Hide Camera-Facing Exterior Walls tool is enabled, the walls are specified as "Invisible" in their specification dialog(s), the "Walls, Normal" layer or other "Wall..." layers are not set to display in 3D camera views, or the ceiling heights of the rooms that the walls are enclosing are set to 0, preventing the program from generating walls upward.
Floor Overviews show the current floor, not including the ceiling, plus any floors beneath it. For example, if you create a Floor Overview on floor 1, but a floor 2 exists in the plan, the walls on floor 1, along with the content below that floor will display in the 3D view; walls present on any higher floors will not be visible unless you navigate to one of those floors.
To see all of the content located in a plan, use a Full Overview camera instead.

edit button.
Note: If the layers mentioned above are displayed, but you don't see foundation components displayed in the camera view, including foundation walls, the "Foundation" layer may not be displayed. Enable the display of the "Foundation" layer, as well, to see if this resolves the problem.


You can also reset the floor and ceiling heights of rooms in your plan on a per-room basis in the Room Specification dialog; however, Reset to Defaults is a faster and more thorough option.
from the menu. If you're still in an active camera view, navigate to 3D> Rebuild 3D