Changes In 6.09.28 :

• Improved driver support: Microsoft Windows Vista 64-bit now supported
• New driver naming convention, detailed in full release notes
• Supports games & applications built on AGEIA PhysX SDK 2.6 (see SDK enhancements below)

• Hardware/Software Cloth
• New deformable objects with impact shape re-tension leveraging cloth based metal - a combination of deformable cloth and non-deformable rigid body, useful for sheet metal and other deformable objects.
• New cloth self collision technology, allowing much more realistic cloth interaction and movement.

Hardware/Software Rigid Bodies

• New joint projection mode
• A new stack overflow protection scheme
  

Hardware Fluids

• Fluid collision improvements
• New static and dynamic cooking methods
• Improved particle sub-system
• New runtime switches for controlling simulation fidelity
• Fluids emitters are now attached to shapes not actors
  

Hardware Scene Manager (HSM)

• The HSM now uses Compartments, allowing the utilization of multiple PhysX cards in future versions.
• The interface of the HSM has been completely revised.

Performance

• The performance improvement of scenes with some types of extensive activity.
• Fluid collision performance improved, especially for dynamic convex shapes.