Twitter for iPad implements a fancy "pinch to expand paper fold" effect. A short video clip here. http://www.youtube.com/watch?v=B0TuPsNJ-XY

Can this be done with CATransform3D without OpenGL? A working example would be thankful.

Update: I was interested in the approach or implementation to this animation effect. That's why I offered bounty on this question - srikar

ios objective-c animation core-animation
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