![]() ![]() GDL contains all the information necessary to completely describe building elements as 2D CAD symbols, 3D models and text specifications for use in drawings, presentations and quantity calculations. Archi CAD uses the GDL (geometric description language) model creation language. Now in its ninth version, Archi CAD's bidirectional associative models keep all the data in one PLN file that can hold a 60,000-square-foot building-including all construction documents-in a 30MB file. Graphisoft ArchiCAD, introduced in 1984, was the first product among these solutions to create a virtual model. ![]()
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