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Posted: Fri Jul 31, 2015 12:25 am
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Pretty much everyone will still use Bullet 2.x. The OpenCL GPU rigid body pipeline is only for experts who know how to use OpenCL and have a fast discrete desktop GPU.
The Bullet 2.83.x github repository includes both Bullet 2.x and the experimental Bullet 3.x OpenCL version. Once the Bullet 3.x API is fully implemented for CPU, we can drop Bullet 2.x.