Nested GLKView and GLKViewController

Question

I'm new to OpenGL ES and I'm experimenting with GLKit. My goal is to develop a very simple app just to get a good feel of OpenGL.

I started with Apple's sample code (OpenGL ES game) and I implemented basic gesture controls: panning, zooming, rotating (trackball algorithm).

Now that this is done, I wanted to play with the different projection matrices and I started to design a user interface to do just that:

_{(source: canardpc.com)}

The only problem is that it doesn't work when the top view in a GLKViewController isn't a GLKView.

Is it possible to have a GLKView as a subview and still retain the cool features of GLKViewController?

Thank you.

score 6 · Accepted Answer · edited Aug 14 '19 at 17:35

Ok so I found the answer.

The "OpenGL View Controller" in the picture must be a normal UIViewController. Subclass this view controller and in the viewDidLoad, create programmatically your OpenGL View Controller:

- (void)viewDidLoad
{
    [super viewDidLoad];

    _openGLViewController = [[FZIOpenGLViewController alloc] initWithNibName:@"FZIOpenGLView" bundle:nil];

    _openGLViewController.view.frame = _openGLView.frame;

    [self.view addSubview:_openGLViewController.view];

}

In this code, _openGLView is an IBOutlet representing "GLKit View" in the picture. It's basically just there to get the right dimensions.

_openGLViewController is your GLKViewController subclass that handles everything OpenGL. The .xib file FZIOpenGLView.xib is just a GLKView with the appropriate File Owner (FZIOpenGLViewController).

It works:

_{(source: canardpc.com)}

Where did you find the coordinates for the trackball and scale in your GLKView? I'm trying to implement something similar - whenever the uses finger is touching the screen and interacting with the 3D model the trackball should display. — kschins, Nov 11 '13 at 17:18

score 0 · Answer 2 · answered May 16 '12 at 07:55

0

Instead of the openGLView that is not used (and just takes up memory), you can use the main view dimensions:

_openGLViewController.view.frame = self.view.frame; // instead of _openGLView.frame

answered May 16 '12 at 07:55

Ziv Kitlaro

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Nested GLKView and GLKViewController

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