cube to sphere

ViewController.mm

//
//  ViewController.m
//  CubeSphere
//
//  Created by MizushimaYusuke on 8/25/15.
//  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 createCube];
    [self createCamera];
}

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

- (void)createCube {
    SCNBox *b = [SCNBox boxWithWidth:1 height:1 length:1 chamferRadius:0];
    b.firstMaterial.diffuse.contents = [UIColor blackColor];
    int size = 10;
    for (int i=0; i<size; i++) {
        for (int j=0; j<size; j++) {
            for (int k=0; k<size; k++) {
                SCNNode *n = [SCNNode nodeWithGeometry:b];
                n.position = SCNVector3Make(i - size * 0.45, j - size * 0.5, k - size * 0.5);
                [self.sceneView.scene.rootNode addChildNode:n];
    }}}
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [self.sceneView.scene.rootNode.childNodes enumerateObjectsUsingBlock:^(SCNNode *n, NSUInteger idx, BOOL *stop) {
        float d = 1.0 - sqrt(pow(n.position.x, 2) + pow(n.position.y, 2) + pow(n.position.z, 2)) / 5;
        d = MAX(d, 0.01);
        [n runAction:[SCNAction scaleTo:d duration:5.0]];
    }];
}

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