14. Go to the Imported Categories tab and clear the tick box on the left of the DWG file you inserted.
Figure 14-1 Hide DWG Civil surface
The following figure shows the Revit file with the DWG file hidden.
Figure 14-2 Revit model after turning off the tin surface.
As Revit can’t export large size models, we need to crop the model before exporting.
15. Use the grip points to crop the Revit model, as shown below.
Figure 15-1 Drag the boundary of Revit model to resize
Next, you will export the Revit model as DWG file.
16. Invoke, the DWG Export dialog box.
17. Select the […] button on the right of the <in-session export setup> list, as shown below; the Modify DWG/DXF Export Setup dialog box will be displayed.
Figure 17-1 Export Revit model to DWG format
18. From the Coordinate system basis area, select Shared. This ensures that the model is exported with the shared coordinates.
Figure 18-1 Use unit millimeter and use share coordinate system
19. Save the DWG file in the required location.
Figure 19-1 Save the DWG file
Next, you will import this DWG file into Civil 3D.
20. Back to AutoCAD Civil 3D, invoke the XR command and select the option to import the DWG file.
Figure 20-1 Click DWG bottom to insert drawing
21. Select the DWG file that you exported from Revit.
Figure 21-1 Select the file
You need to make sure the insertion point coordinates are set to project base point so that the real world coordinates of the Revit model match with that of the Civil 3D model.
22. In the Attach External Reference dialog box, make sure the drawing is being inserted at project base point.
Figure 22-1 Untick the Scale and Insertion point box
The following figure shows the Civil 3D drawing with the Revit model imported as DWG at the right coordinates.
Figure 22-2 The Revit coordinate system matched with the Civil cogo point