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DGN

A DGN file is a 2D/3D drawing created by MicroStation or Intergraph Interactive Graphics Design System. Such files are typically used to save designs for construction projects for highways, bridges, and buildings.

3DM

A 3DM file is a native file format for 3D models in Rhinoceros CAD application software. It contains surface, point and curve information.

3DM files can be exported in both NURBS (non-uniform rational B-spline) and polygon mesh representations, making it possible for other CAD / CAM / CAE / graphic design software to edit those models.

In addition to Rhino CAD software, 3DM files can be opened with Autodesk Fusion 360.

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