Let\'s say we\'re developing a 2D game with Cocos2d-iPhone and UIKit and CoreAnimation. But we\'re also considering leveraging the 3D capabilities of Unity 3D.
Is it
Yes, it's possible.
The guys from Blurst have made some games using Cocoa as frontend and Unity to 3D stuffs. Take a look on links below, there are very good informations on them: