* working eytzinger aabb
* working and reasonably efficient variable radius offset
* working example
* comments
* better key commands
* bad includes, defines
* missing sign function; test
* add codesign for mac execs
* better ifdef guard
* simple brute force obb
* wrapper on cgals obb
* tutorial for OBB
* minimal test
* minimal test
* note
* use igl::PI
* expose quantity to optimize over
Alec Jacobson