You can find this 3DFACE option in RFEM under the DXF interface related to the file under "File" → "Export" → "ASCII Format Model (*.dxf)" and in the direct interface under "File" → "Export" → "Autodesk AutoCAD".
DXF Export with 3DFACE Elements
The DXF interface in RFEM now exports a 3DFACE element in the DXF file for each FE mesh cell of the exported structure. The 3DFACE element is detected by AutoCAD during import, for example, and can be displayed as a surface in the graphic. Different visual styles help display the 3DFACE surfaces in a desired view.
Author
Mr. Niemeier is responsible for the development of RFEM, RSTAB, RWIND Simulation, and in the area of membrane structures. He is also responsible for quality assurance and customer support.
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