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Errors: Surface cannot be simplified in Civil 3D

By March 27, 2019No Comments


Surface cannot be simplified in Civil 3D.


The surface was created by adding drawing objects – 3D faces – and the optionĀ “Maintain edges from objects selected” was activated.
With that option activated it is not possible to change the triangulation of the surface at a later time.


  • Export the surface as IMX or LandXML file
  • Import the IMX/LandXML file again into Civil 3D
  • The surface can be simplified after the export/import process