Marrying Core Animation with OpenGL ES

Question

Edit: I suppose instead of the long explanation below I might also ask: Sending -setNeedsDisplay to an instance of CAEAGLLayer does not cause

Answer 1

You can override display instead of drawInContext. During the animation, the animated value is in the presentation layer.

- (void) display
{
    GLLayer* myPresentationLayer = (GLLayer*)[self presentationLayer];
    self.renderer.centerPoint = myPresentationLayer.sceneCenterPoint;
    [self.renderer render];
}

At the end the presentation layer will have the model layer value, so you’ll need to set the final value on the model layer before starting the animation.