OFF2PLC is a C++ program which reads an OFF file describing a surface in 3D, and creates an equivalent PLC file, by Alex Rand.
off2plc file.offwhere
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
OFF2PLC is available in a C++ version.
BOOST, C++ programs which demonstrate the use of the Boost libraries;
MESHLAB, examples which illustrate the use of the meshlab program, an advanced mesh processing system for automatic or user-assisted editing, cleaning, filtering, converting and rendering of large unstructured 3D triangular meshes. MESHLAB can read and write 3DS, OBJ, OFF, PLY, and STL graphics files.
OFF, a data directory which contains examples of Object File Format (OFF) files, a Geomview file format for 3D graphics;
PLC, a data directory of examples of PLC files, used to describe a piecewise linear complex, a surface that bounds a 3D region that is to be meshed.
Alex Rand
You can go up one level to the C++ source codes.