element connectivities in text, when matched with the corresponding coordinates of the nodes from dupPt, it makes all the polygons again (Green lines in the picture below), exactly as the original.
So Im thinking its like reconstructing everything again from the original shape with new relation between coordinates and element connectivities.
So in this case, eg: 0 1 2 3 4 5 makes the hexagon, 21 20 0 5 to makes the trapz.
Well here it misses the '0' in the end to close the hexagon here, the same with trapz. However the 'string join' and cset somehow close it to 0 1 2 3 4 5 0 to makes the hexagon, and 21 20 0 5 21 for trapz.
Im very glad now.
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If you are importing IFC models into Archicad 15, make sure you have applied this hotfix: ArchiCAD 15 Hotfix-2 Build 3602 as it effects improvements to the AC IFC engine for importing.