Hi. I am new to Irrlicht and I am interested in using it in my current project. In the features page it lists "Collision detection and response." Does this mean that it has its own physics engine, much like Ageia's PhysX is? Or is it just a response to a collision in the form of raising an event?
It does have some collision (just event raising). See example 7.
It is not, however, as advanced as PhysX or other physics engines. If you want better physics, just use a physics engine as well (search these forums for Newton, Bullet, or PhysX wrappers).
You should also check the forum for wrappers, some are already done. For example IrrNewt for Newton...there's also something called PAL (Physics Abstraction Layer) that handles several physic engines.
There are no "supported" physics engines. People just make wrappers out of the kindness of their souls. It's only a matter of whether someone is willing to do it, or if you will do it your self.