- improved friction model for parallel solver (align the friction direction with projected velocity, unless the projection is close to zero (only then use 2 arbitrary axis orthogonal to contact normal)
- added bt32BitAxisSweep3, which co-exists without recompilation, using template class. This broadphase is recommended for large worlds with many objects (> 16384), until btMultiSwap is finished.
- Fixed some recent issues in Bullet 2.57 related to compound (thanks Proctoid) and memory allocations