###ofxMarchingCubes by Andre Sier, july 2012
/*
openframeworks marching cubes implementation by andré sier http://s373.net/code/marchingcubes
Marching cubes implementation after Paul Bourke polygonize voxel.
http://paulbourke.net/geometry/polygonise/
201207 - of version
201004 - processing version
code released under LGPL3.0 . http://www.gnu.org/licenses/lgpl-3.0.txt)
copyright 2012, Andre Sier http://s373.net
*/