To export the data and import it into Revit, select Export to LandXML from the Output tab and choose exactly what data you want to export, and, then, import into your Revit project from.

You can export the surface data into an XML file and import that into Revit or you can link the AutoCAD data from Civil 3D as background information in Revit.Find converter to ply file type: dwg to ply.

Find conversions from ply file: ply to dwg. How to convert: Generally speaking, polygon files can be exported to several CAD formats.