How to import a Civil toposurface in Revit

Revit is not able to read Civil surfaces directly. However, there are two approaches you can take to bring these surfaces from Civil into Revit:

1. Use the new Link Topography command (Revit 2019.1 and later)

2. Simplify the Civil topography to AutoCAD standard data, and import:
   1. Export the Civil 3D drawing to standard AutoCAD format EXPORTTOAUTOCAD.
      Note: It is recommended to simplify a copy of the original Civil drawing before exporting it to AutoCAD with only the minimum objects required to bring into Revit.
   2. Once you have done the Export from Civil 3D, link the DWG file in Revit then apply create the Toposurface:
      1. Go to a 3d View
      2. From the "Massing and Site" ribbon tab choose "Toposurface"
      3. From the "Modify | Edit Surface" ribbon tab choose "Create from Import > Select Import Instance"
      4. Now select the linked DWG file
      5. When the layer list appears click on "Check None" then select only the layer(s) containing the toposurface you wish to import - Note that if you have multiple toposurfaces it is recommended to import one by one by repeating the process and choosing every time a single layer containing the surface
      6. Click OK when done then click on the "Finish Surface" button in the Edit Surface ribbon tab to complete the creation of your toposurface.