This is the new refactored version of Bullet physics library version 2.x Questions? mail blender at erwincoumans.com, or check the bf-blender mailing list. Thanks, Erwin Apply patches/blender.patch to fix a few build errors and warnings and dd original vertex access for BMesh convex hull operator. Documentation is available at: http://code.google.com/p/bullet/source/browse/trunk/Bullet_User_Manual.pdf and: https://github.com/bulletphysics/bullet3/tree/master/docs