Internal physics system in Unity is using custom driverless version PhysX SDK – unfortunately, since main SDK core is very old (2.5, afair), it’s missing not only recent updates and bugfixes, but some features like fluids, cloth, forcefields and even GPU-acceleration. While Unity Technologies were keeping PhysX un-updated for years in a matter of “combability”, such renovation was actually needed by developers.
And, finally – recent announce of long awaited Unity 3.0 engine promises not only iPad and Ps3 platforms support, deferred render, built-in lightmapping system and unified editors, but “major updates to Unity’s.. physics features“
No details were revealed, but Tom Higgins, Unity Product Evangelist, made a short sneak-peak
We are upgrading PhysX but will be saving the specifics until later, let’s just say it will have some juicy new features for sure!
We’ll try to keep an eye on this, so stay tuned.
Update: new details on PhysX features for Unity 3.0 beta