A new release of the Bullet Physics SDK
has been released offering several new features and bug fixes. Interesting to note is that it says 'The cross-platform cmake build system support is improved and preparations are made towards upcoming OpenCL GPU acceleration for Bullet 3.x' So it sounds like we will definitely be seeing a GPU accelerated version of Bullet Physics sometime in the near future so PhysX will no longer be the only video game Physics engine with GPU acceleration support.
Bullet is a Collision Detection and Rigid Body Dynamics Library. The Library is Open Source and free for commercial use, under the ZLib license. This means you can use it in commercial games, even on next-generation consoles like Sony Playstation 3.
From the Bullet Physics Game Physics Simulation Blog
The new Bullet 2.76 SDK includes several new features and improvements. The new btInternalEdgeUtility avoid collisions against internal edges for smooth sliding along a triangle mesh. The cross-platform cmake build system support is improved and preparations are made towards upcoming OpenCL GPU acceleration for Bullet 3.x.
The new binary file format improves current and future tools support for Bullet.
The extensible .bullet file serialization is cross-compatible between 32/64bit, little and big endian, single and double precision and different Bullet SDK versions. This means you can export a .bullet file in Maya 64bit on a little endian Intel machine and import it on a 32bit big endian PlayStation 3
You can read the post here
and more info about the new release in the Bullet Physics Forum here
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