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Triangulated soil surfaces usually contain a lot of irrelevant details for the intended analysis. This movie explains how to convert a triangulated surface to smoothed NURBS surfaces in a third-party CAD software application for efficient modelling in PLAXIS.
Importing CAD data into PLAXIS 3D
[Videos]
How do I import a geometry in PLAXIS 3D?
[Tips and Tricks]
Importing a surface from AutoCAD 3D Civil [PLAXIS 3D 2013]