This video shows how to create an accurate Toposolid from a linked Civil CAD file in Revit 2025 (or Revit 2024). It coveres the common workflow where the CAD file is just contours at the correct elevation, and then shows and compares a more accurate option of using a triangulated surface from AutoCAD Civil 3D. Finally, I mention but do not show how a published Civil 3D surface is the most accurate option.