Whether a building is complex or fairly simple, sometimes typical 2-dimensional views just don’t display what you really need to see. Using a 3D view of a section through a building gives a better view of just what is going on inside the building. Most 3-dimensional software packages have methods to create 3D section views, and you should take advantage of those when beneficial to you.
One method of creating a 3D section in Revit is by using an existing section as the determining location of the 3D section view. This process is:
- Create a 3D view by clicking on the Default 3D View command on the Create panel of the View tab.
- Right-click on the {3D} view in the Project Browser and select Duplicate View -> Duplicate from the context-sensitive menu to create an identical view. This will create a new 3D view named Copy of {3D}.
- Make sure that the newly created 3D view is active.
- Right-click on the ViewCube and select Orient to View -> Sections, then select the desired section view from the list of sections already placed in the model. (This will make the 3D view look like it is a section view, but will still be considered a 3D view.)
- Hold down the Shift key at the same time as the middle mouse button to orbit the view to display the 3D section as desired.
- The 3D section location can be adjusted by either repeating steps 3, 4 and 5, or by adjusting the location of the section line in a plan view, elevation view, or another section view to display the section cut as desired in the 3D view.
- Renaming the new 3D view is a good idea. Right-click on the newly created 3D view named Copy of {3D} in the Project Browser and select Rename from the context-sensitive menu. Name the 3D view with the same name as the section view that was just used with the 3D view.

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How do you create the earth/ground plane mass that surrounds your building foundation?
You create the ground mass around the building by using a Toposurface from the Site tools. You can use the Building Pad tool to create a “hole” in that Toposurface for the building location.