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Bullet 2.75 beta 1 (SVN revision 1676) is available for download and testing:http://code.google.com/p/bullet/downloads/listSome features: * Smoothed Particle Hydrodynamics (SPH) fluids preview, thanks to Rama Hoetzlein for contributing this under the ZLib license! See Bullet/Extras/sph. The SPH fluids will be integrated into Bullet with two-way interaction, similar to cloth/soft body simulation. * GPU physics kernels preview. Right now mainly CPU version, you can enable CUDA version manually. An OpenCL version will follow soon. See Bullet/Demos/Gpu2/3dDemo * 2D physics demo, with 2D and 3D object interaction, see Bullet/Demos/Box2dDemo * New constraints: btHinge2Constraint,btUniversalConstraint,btGeneric6DofSpringConstraint, thanks to Roman Ponomarev * Use ALT+Left/Middle/Right Mouse button+mouse motion for Maya-style camera navigation * many bug fixes