An add-on for AUTOCAD 2002-2018 or BricsCAD V15-V17, which determines the unfolded section of one set of 3DSOLID, 3DMESH or 3DFACE entities and vertical planes passing through a 2D POLYLINE which may contain arcs, in XOY plane. Developed section is generated in the vertical plane passing through first segment of POLYLINE. The intersection is generated in the form of 3DPOLY entities. You can set also the "concatenation precision".