TwoDView *twoD =[[TwoDView alloc]init];
CATransition *animation = [CATransition animation];
[animation setDuration:0.4];
[animation setType: kCATransitionPush];
[animation setSubtype: kCATransitionFromLeft];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault]];
[self.navigationController pushViewController:twoD animated:NO];
[self.navigationController.view.layer addAnimation:animation forKey:nil];
[twoD release];
CATransition *animation = [CATransition animation]; [animation setDuration:0.4]; [animation setType: kCATransitionPush]; [animation setSubtype: kCATransitionFromRight]; [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault]]; // [self.navigationController popViewControllerAnimated:YES]; //[self.navigationController pushViewController:threeD animated:NO]; [self.navigationController.view.layer addAnimation:animation forKey:nil]; [self.navigationController popViewControllerAnimated:NO];