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iPhone gluProject and gluUnProject Posted: 19-11-2009 | Author: flexicoder | Category: iPhone Development Now that I’ve started to do some OpenGL I needed to determine where in my 3D world a user had touched. In order to do this you can use a function called gluUnProject, which isn’t part of the standard framework. I’ve converted the code (so have many others) and posted it here in case it might h