Bullet 2.61 released, improved Generic 6DOF constraint

[Erwin Coumans]

Bullet 2.61 is another rapid update to fix some bug reports: issues with unions under certain gcc/Linux versions caused collision problems with capsules and convex hulls.

- Improved Generic 6DOF constraint, with ragdoll demo
- Added serialization for BVH tree ('cooking') for btBvhTriangleMeshShape. See ConcaveDemo for example. Thanks to Phil Knight.
- Fixed issue with kinematic objects at low angular velocity
- Added bt32BitAxis3Sweep broadphase for larger worlds (> 16384 objects, large coordinates)
- Replaced several dynamic allocations by pool/stack allocations. Minor API change, see demos (btDefaultCollisionConfiguration)
- fix in math lib, thanks Jay Lee
- added branch-free quantized aabb overlap check, thanks Phil Knight
- register sphere-sphere, sphere-box, sphere triangle by default
- faster traversal for BVH/triangle meshes by default

Download Bullet 2.61 from sourceforge

Thanks,
Erwin