Note installing modules such as pytorch and opencv with pip in Blender python (2.82a or later)

background

I want to visualize 3D face data using OpenCV or dlib in Blender, or combine it with machine learning in cooperation with pytorch.

environment

• Ubuntu 18.04
• Blender 2.82a(python3.7.4)

pip installation

In the initial state, pip is not included, so ensure pip https://docs.python.org/ja/3/library/ensurepip.html

Install with.

$ /path/to/blender/2.82/python/bin/python3.7m -m ensurepip

After this, you can use it with -m pip.

$ /path/to/blender/2.82/python/bin/python3.7m -m pip

Modules that require C / C ++ compilation

Some modules, such as dlib, need to be compiled from source code during pip.

Python 3.7 development environment (header file) is required. Blender does not include Python.h etc.

Use system python dev

For Ubuntu 18.04, put python3.7-dev with apt,

$ env CXXFLAGS="-I/usr/include/python3.7m" /path/to/blender/2.82/python/bin/python3.7m -m pip install dlib

If you add a header path with CXXFLAGS, for the time being, pyconfig.h is different, so I'm a little worried.

Get header files from Python source code (recommended)

I think it is safe to drop the python source code and install the header related items in / path / to / blender / 2.82 / python / include / python3.7m on the blender side.

You should now be able to install modules that require C / C ++ compilation!

You should be able to import it in the Blender Python console!

TODO

• [] Check if you can set up a virtual environment using blender python environment with miniconda or virtualenv
• [] Build Blender from the source code to make it easier to set up the python development environment.
• [x] Check if it works properly even in Blender offline mode (CLI mode) (for batch processing)
• You can use blender --background --python-console.