What iPhone OS APIs could I use to implement a transition animation similar to the iBook page flip transition?

Question

I'm building an iPad app that will have multiple paper pages and I'd like to implement a page transition effect that is similar to the animation you see when you turn pages in the iBooks app on the iPad. A few questions...

1. Is that animation readily available somewhere in the UIKit API or would I have to implement it myself?
2. If I have to implement it myself, what's a good approach or API I should look into? It definitely has a 3D feel to it, could they be using the OpenGL ES API for that?

Answer 1

Apple certainly uses OpenGL ES to implement it. The actual API Apple uses is private, but this blogger has the starting of an implementation with sample code.