ShapeOp Python bindings

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Recently, the Computer Graphics and Geometry Laboratory of EPFL released the ShapeOp library, which is “a header-only C++ library for static and dynamic geometry processing, using a unified framework for optimization under constraints“.

The process of creating Python bindings for the library is described in the official documentation. However, if you are on Mac and using a non-framework version of Python, such as one provided by macports, anaconda, homebrew …, you may need a few more instructions. I will describe the process for the macports version of Python.

First of all, make sure you have the following ports installed:

  • cmake
  • swig
  • python-swig
  • boost
  • eigen
  • eigen3

This will take some time, so go do something else while it is happening. Then proceed as instructed in the SahpeOp documentation:

$ mkdir build
$ cd build
$ make

Finally modify the link path of using install_name_tool. You need to have the CommandLine Tools of XCode installed to do this, but if you got this far, i assume this is already taken care of.

First, check the current link path:

$ cd ./libShapeOp/bindings/python
$ otool -L

The first link should be changed. Therefore, do the following:

$ install_name_tool -change /System/Library/Frameworks/Python.framework/Versions/2.7/Python /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib

After this, executing the file should return this output:

Input points:
0.0 0.5 0.5 0.0 
0.0 0.0 1.0 1.0 
0.0 1.0 0.0 1.0 
Output points:
0.0 0.0 0.0 0.0 
0.0 0.0 1.0 1.0 
0.0 1.0 0.0 1.0 

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