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See USE_SOFTWARE_CACHE in Bullet\src\BulletMultiThreaded\SpuNarrowPhaseCollisionTask\SpuGatheringCollisionTask.cpp It improves the Bullet midphase collision detection (triangle/vertex fetch) The license is CommonPublicLicense-1.0, see included license docs.
Bullet is a 3D Collision Detection and Rigid Body Dynamics Library for games and animation. Free for commercial use, including Playstation 3, open source under the ZLib License. Discrete and continuous collision detection, integrated into Blender 3D, and COLLADA 1.4 Physics import. See the Bullet_User_Manual.pdf for more info and visit the Bullet Physics Forum at http://bulletphysics.com