I built a Perl/Xcode project for loading .obj and .mtl files into OpenGL ES 2.0 on iOS, available here. It's called mtl2opengl
and you can see comments/results from other S.O. users in these similar questions:
- opengles display human face in iphone
- ios : Displaying a simple 3D model with GLEssentials sample code
- How to convert Blender blend (or obj) file to Qualcom Vuforia .h file