Inserting 3D objects in the iPhone application

I would like to add few 3D objects in my iPhone application. My application is basically a eBook kind of a application & I would like to embed few 3D objects in 2 to 3 pages. I would lik开发者_运维技巧e the users to rotate the 3D object and see various angles. Do I need to use any 3D applications such as Unity3D for such applications or I will be able to achieve this using just Objective C. Please help me..thanks.

I'd look at:

http://isgl3d.com/

as it's objective c based.

SIO2 is simple and free 3D engine.