Symmetrization of 2D Polygonal Shapes Using Mixed-Integer Programming

This repository contains the code and test dataset for the hypothesize-and-select based 2D symmetrization method described in the following paper:

Jin Huang, Jantien Stoter, Liangliang Nan.
Symmetrization of 2D Polygonal Shapes Using Mixed-Integer Programming.
Computer-Aided Design, 2023

Obtaining Symmetrization

You can build Symmetrization from the source code˙

• Download the source code.

• Dependencies (Attention for Windows users: ALL dependencies must be for x64)

  • Gurobi. Note for Linux users: You may have to build the Gurobi library (libgurobi_c++.a) because the prebuilt one in the original package might NOT be compatible with your compiler. To do so, go to src/build and run make. Then replace the original libgurobi_c++.a (in the lib directory) with your generated file.
  • CGAL (v5.4 and later).

• Build

  There are many options to build Symmetrization. Choose one of the following (not an exhaustive list):

  • Option 1 (purely on the command line): Use CMake to generate Makefiles and then make (on Linux/macOS) or nmake(on Windows with Microsoft Visual Studio).

    • On Linux or macOS

      $ cd path-to-root-dir-of-Symmetrization
      $ mkdir Release
      $ cd Release
      $ cmake -DCMAKE_BUILD_TYPE=Release ..
      $ make
      

    • On Windows with Microsoft Visual Studio, use the x64 Native Tools Command Prompt for VS XXXX (don't use the x86 one), then

      $ cd path-to-root-dir-of-Symmetrization
      $ mkdir Release
      $ cd Release
      $ cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release ..
      $ nmake
      

  • Option 2: Use any IDE that can directly handle CMakeLists files to open the CMakeLists.txt in the root directory of Symmetrization. Then you should have obtained a usable project and just build it. I recommend using CLion or QtCreator. For Windows users: your IDE must be set for x64.

  • Option 3: Use CMake-Gui to generate project files for your favorite IDE. Then load the project to your IDE and build it. For Windows users: your IDE must be set for x64.

  Don't have any experience with C/C++ programming? Then check this How to build I wrote for Easy3D.

Run Symmetrization

This repository contains an executable program, which is a demo version of our method with a GUI. The program accepts a 2D polygonal shape as input, represented by a .obj file.

• If the symmetry axis is aligned with Y-axis, press "R" to symmetrize the shape.
• If the symmetry axis is arbitrary, press "Q" to symmetrize the shape.
• If you want to add the horizontal and vertical constraints, press "H" to symmetrize the shape.

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Data

• Some test data can be found here.
• You can manually create 2D polygonal shape by "CTRL" + "clicking", which activates editing mode.

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About the solvers

This demo program use the commercial solver Gurobi for the core optimization step. To use Gurobi, install it first and make sure the headers and libraries of Gurobi can be found by CMake. This can be done by specifying the paths of Gurobi in FindGUROBI.cmake. Note: you need to obtain a license to use Gurobi, which is free for academic use.

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Citation

If you use the code/program (or part) of Symmetrization in scientific work, please cite our paper:

@article{huang2023symmetrization,
  title={Symmetrization of 2D Polygonal Shapes Using Mixed-Integer Programming},
  author={Huang, Jin and Stoter, Jantien and Nan, Liangliang},
  journal={Computer-Aided Design},
  pages={103572},
  year={2023},
  publisher={Elsevier}
}

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License

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License or (at your option) any later version. The full text of the license can be found in the accompanying LICENSE file.

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Should you have any questions, comments, or suggestions, please feel free to contact me at: J.Huang-1@tudelft.nl

Jin Huang

https://yidahuang.github.io/

June 15, 2023

Copyright (C) 2023