Python Octree Implementation
Based on [1], which is clearly derived from [2]. Consulted tutorial at [3], which has example source code at [4].
Developed and tested on 64-bit Linux with Python 2.7.3 and 3.3.0
[1] https://code.google.com/p/pynastran/source/browse/trunk/pyNastran/general/octree.py?r=949
[2] http://code.activestate.com/recipes/498121-python-octree-implementation/
[3] http://www.brandonpelfrey.com/blog/coding-a-simple-octree/