Defines CAD documents (Computer Aided Design) that are used for a 3D graphics file formats and may contain 2D or 3D designs. Includes the following...types: Dgn , Dwf , Dwg , Dwt , Dxf , Ifc , Igs , Plt , Stl . Learn...2D and 3D design data. Like DXF, which are ASCII files, DWG represent...