An application for AUTOCAD 2002-2008, which determines the developed section of one set of 3DSOLID, 3DMESH or 3DFACE entities and vertical planes passing through a 2D POLYLINE in XOY plane. Developed section is generated in the vertical plane passing through first segment of POLYLINE, in the current layer. The intersection is generated in the form of LINE entities, colored from 1 to 1, beginning with the color 1, corresponding to every vertical plane.