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Can I develop OpenGL ES iPhone simple physics app with Xcode 3 in C++ without a GUI and Objective-C? So I don't need Cocoa and I don't need Objective-C?

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You want to build a graphics app without a GUI? I'm confused... –  Jeremy Heiler Jun 5 '12 at 20:34
    
just for a start like in example when making a new project but not that cube and just 3D Box made with Blender that I can touch with iPhone in realtime, or I need Cocoa anyway? –  Saulius Jun 5 '12 at 20:36
    
If you have a giant codebase that requires that you use C++, it might be useful. But if you're starting from scratch, consider not using C++. If you use it, you'll end up with some Objective-C++ files and these are a mess to get to work properly, especially if you use nontrivial C++ features (like exceptions) –  K.Steff Jul 7 '12 at 0:55
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Almost. As in 99%+. But the simplest way to display your Open GL graphic window and to get user input (such as touch events) and OS events would be to use a small thin Objective C wrapper around your C or C++ code. You could instead call the OS via much more verbose usage of the object runtime to get to any needed OS APIs, but why bother?

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You need a small amount of Objective-C for the application. The rest might be plain C.

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