   Questions about OpenGL ES (iPhone)
  Hi!I am currently learning OpenGL ES for the iPhone and I am wondering what utility and aux libraries there are for OpenGL (ES). I have developed a few games using DirectX and Ogre on Windows. For example, DX has the D3DX9 library which provides nice functions for working with 3D vectors, and Ogre has very nice vector classes. Is there anything like these in OpenGL ES?Or do I perhaps have to create my own vector class? If so, would you recommend writing it as an Obective-C class or a C struct? Or perhaps a C++ class (using Objective-C++)?Any thoughts? Thanks!Sebastian Ahlman   