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    To be pedantic, you still use Z so that you can let the hardware do sorting for you. The big change is that (likely) the 2D application will use an orthographic view instead of a perspective one. Commented Aug 25, 2010 at 1:14
  • Thank you very much for your answer, your statement shows me that I was wrong about the Opengl and Opengl ES definition. Commented Aug 25, 2010 at 17:19