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tpaviot / pythonocc-core

Python package for 3D geometry CAD/BIM/CAM
GNU Lesser General Public License v3.0
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Build for 0.18.1 (18.04 Beaver) defaults to Python2, Need 3 #715

Open jwatson-CO-edu opened 5 years ago

jwatson-CO-edu commented 5 years ago

I followed the below steps for installing OCE/Python-OCC, and to my dismay I found that the build process targets Python2 instead of Python3. My lab's standard is Python 3.6+. The instructions do not seem to address this issue.

  1. Install OCE 
    
git clone git://github.com/tpaviot/oce.git
cd oce/
mkdir build && cd $_

cmake -DOCE_INSTALL_PREFIX:PATH=$HOME/libs/OCE \ -DOCE_WITH_FREEIMAGE:BOOL=ON \ -DOCE_WITH_GL2PS:BOOL=ON \ -DOCE_DRAW:BOOL=ON \ -DOCE_WITH_FREEIMAGE:BOOL=ON \ -DOCE_WITH_GL2PS:BOOL=ON \ -DOCE_ADD_HEADERS:BOOL=ON \ -DOCE_COPY_HEADERS_BUILD:BOOL=ON \ ..

make -j8 make install


2. Install Python-OCC

git clone git://github.com/tpaviot/pythonocc-core.git cd pythonocc-core mkdir cmake-build && cd $_

cmake -DOCE_INCLUDE_PATH=$HOME/libs/OCE/include/oce \ -DOCE_LIB_PATH=$HOME/libs/OCE/lib \ ..

make -j8 sudo make install

rainman110 commented 5 years ago

Just open cmake-gui, activate advanced and grouped, and chose a different python interpreter and python library.

Then click configure and then generate to change the makefiles.

Close cmake gui and build pythonocc as usual with

make -j 8
jwatson-CO-edu commented 5 years ago

Oh, the install instructions did not call for cmake-gui, but I did some learning and got the following results:

  1. I was able to point cmake-gui at the correct installation of Python. However ...
  2. I attempted to set vars OCE_INCLUDE_PATH and OCE_LIB_PATH as instructed. Although their values were the same as above, I received make errors indicating an incorrect OCE path.
  3. Using the GUI, I was able to back out what PYTHON_EXECUTABLE, PYTHON_INCLUDE_DIR, and PYTHON_LIBRARY are supposed to be.

tl;dr I used the following cmake command: 

cmake -DOCE_INCLUDE_PATH=$HOME/libs/OCE/include/oce \
    -DOCE_LIB_PATH=$HOME/libs/OCE/lib \
    -DPYTHON_EXECUTABLE=/usr/bin/python3.6 \
    -DPYTHON_INCLUDE_DIR=/usr/include/python3.6 \
    -DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.6m.so \
    ..

And was able to successfully build, install, then import from OCC in Py3.

Overall the build process for this project is very straightforward, except for this snag. I think if you provided some direction for Py3 users, it would be perfect.