No its not hiding robvas, there is no OpenGL Mac project template in Xcode 4.
But there is a OpenGL Game template in the iOS templates.
You could create one and put it in the
~/Library/Developer/Xcode/Templates/Project Templates/Application/OpenGL
Folder, then it would be displayed on creating a new Xcode project.
A good start for a template, would be a standard Cocoa or Empty application, and then add the OpenGL.framework and the GLUT.framework, from the
project navigator, under the linked frameworks heading, click the + button to
add these frameworks.
Then you could also add a new Objective C Class file to the project, and type
in OpenGLView as its class name, and type in NSOpenGLView as its subclass.
You can also drag a OpenGL View object from the Object Library in Interface
Builder, onto the main Window, and set its class to the previously added file
OpenGLView.
Thats how I would go about getting a basic OpenGL project template.
Hope this helps.
Regards Mark
PS. I posted this after you found a solution, well done for that.