Install PyMCubes

This is more complex. First, you have to install Cython:

$ /path/to/blender/2.xx/python/bin/python3 -m pip install Cython

Then you have to set up a build environment for Cython. You will need 1) to install development files for Python (such as Python.h and others), and 2) to explain Blender's python where to find them. Note: you have to have headers for exactly the same version of Python that your Blender build is using.

On Debian/Ubuntu, you can install Python's development files by apt-get install libpython3.7-dev for python3.7m used in Blender 2.80/2.81. On other Linux distros, the command will be similar. On Windows or MacOS this can be more tricky, I did not try.

You have to somehow tell Blender's built-in python where to look for headers. I've found the simplest way is to do

$ ln -s /usr/include/python3.7m/* /path/to/blender/2.xx/python/include/python3.7m/

There may be more correct way, but I do not know it.

After that, you can install PyMCubes by

$ /path/to/blender/2.xx/python/bin/python3.7m -m pip install -U PyMCubes

The following node can optionally use PyMCubes:

• Marching Cubes