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The method by which existing geometry data from CAD programs (e.g. AutoCAD) can be used again is explained in this tutorial.
The goal of this tutorial is to import a cross section of a window construction or to import a cross section of a roof-wall junction that has been created with AutoCAD.
Figure 1: Window frame
Figure 2: Roof-wall junction
Adjusting the import settings and opening a DXF file
Selection of to be imported layers, Material assignment
Deleting unused edges and closing boundary lines
Converting DXF files and correcting "problem spots"