shredded paging

ViewController.m

//
//  ViewController.m
//  ShreddedPaging
//
//  Created by MizushimaYusuke on 9/11/15.
//  Copyright (c) 2015 MizushimaYusuke. All rights reserved.
//

#import "ViewController.h"
@import SceneKit;

@interface ViewController ()
@property (nonatomic, weak) SCNView *sceneView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self setupScene];
    [self createPaper:[UIColor whiteColor]];
    [self createCamera];
}

- (void)setupScene {
    SCNView *sceneView = [[SCNView alloc] initWithFrame:self.view.bounds];
    sceneView.scene = [SCNScene scene];
    sceneView.backgroundColor = [UIColor lightGrayColor];
    sceneView.autoenablesDefaultLighting = YES;
    [self.view addSubview:sceneView];
    
    self.sceneView = sceneView;
}

- (void)createPaper:(UIColor *)color {
    SCNNode *page = [SCNNode node];
    page.name = @"page";
    [self.sceneView.scene.rootNode addChildNode:page];
    
    SCNBox *strip = [SCNBox boxWithWidth:5 height:0.2 length:0.01 chamferRadius:0];
    strip.firstMaterial.diffuse.contents = color;
    
    for (int i=0; i<50; i++) {
        SCNNode *stripePaper = [SCNNode nodeWithGeometry:strip];
        stripePaper.pivot = SCNMatrix4MakeTranslation(2.5, 0, 0);
        stripePaper.position = SCNVector3Make(0, i * 0.2, 0);
        [page addChildNode:stripePaper];
    }
}

- (void)createCamera {
    SCNNode *camera = [SCNNode node];
    camera.camera = [SCNCamera camera];
    camera.position = SCNVector3Make(0, 0, 20);
    [self.sceneView.scene.rootNode addChildNode:camera];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    static int count = 1;
    SCNNode *page = [self.sceneView.scene.rootNode childNodeWithName:@"page" recursively:NO];
    page.position = SCNVector3Make(0, 0, 0.001 * (10 - ++count));
    
    [page.childNodes enumerateObjectsUsingBlock:^(SCNNode *n, NSUInteger i, BOOL *stop) {
        [n runAction:
            [SCNAction sequence:@[[SCNAction waitForDuration:i * 0.05], [SCNAction moveTo:SCNVector3Make(n.position.x, n.position.y, 0.002 * count) duration:0],[SCNAction rotateByX:0 y:M_PI z:0 duration:1.0]]]
         ];
    }];
    
    page.name = @"";
    float hue = count * 0.1;
    [self createPaper:[UIColor colorWithHue:hue saturation:0.4 brightness:1 alpha:1]];
}

@end