I'm currently trying to integrate bullet with Unity. The problem is that I don't know where to start. Can anyone point me in some direction? Thanks a lot.
P.S. - I already ask for help in the Unity forum but I got no answer So maybe you guys can help me
As Unity only really offers c# , boo and javascript options for coding then I think you'd struggle to use it, though you could use something like http://code.google.com/p/bullet-xna/ (shameless plug). I haven't touched it for a while but theres no reason it wouldn't work with Unity. Out of interest what are you trying to do that the native Unity physics code doesn't support?
As I understand, Unity has PhysX 2.X. So various users have noticed substantial speed increases using bullet, though I supposed you would also get a boost from a PhysX 3.x integration. Also you could write a C++ plugin with a pro license.