かまくらブロック

雪のブロックでかまくらをつくるイメージでiPhoneアプリのサンプルコードを描いてみます。

#import “ViewController.h”

@import SceneKit;

@interface ViewController ()

@property (nonatomic, weak) SCNView *sceneView;

@end

@implementation ViewController

– (void)viewDidLoad {

    [super viewDidLoad];

    

    [self setupScene];

    [self createGround];

    [self createSnowDome];

    [self createLight];

}

– (void)setupScene {

    float w = CGRectGetMaxX(self.view.bounds);

    SCNView *sv = [[SCNView alloc] initWithFrame:CGRectMake(0, 0, w, w)];

    sv.backgroundColor = [self color:2];

    sv.scene = [SCNScene scene];

    [self.view addSubview:sv];

    

    self.sceneView = sv;

}

– (void)createGround {

    SCNBox *ground = [SCNBox boxWithWidth:40 height:1 length:40 chamferRadius:0];

    ground.firstMaterial.diffuse.contents = [self color:3];

    SCNNode *groundNode = [SCNNode nodeWithGeometry:ground];

    groundNode.physicsBody = [SCNPhysicsBody staticBody];

    [self.sceneView.scene.rootNode addChildNode:groundNode];

}

– (void)createSnowDome {

    static int counter = (1 + 2 + 3 + 4 + 5) * 4;

    static int floor = 5;

    

    int nextFloorStart = 0;

    for (int i=1; i<floor; i++) nextFloorStart += i * 4;

    

    SCNBox *snowBlock = [SCNBox boxWithWidth:3 + floor * 0.2 height:3 length:4 chamferRadius:0];

    int coloridx[] = {0, 1, 4};

    snowBlock.firstMaterial.diffuse.contents = [self color:coloridx[arc4random_uniform(2)]];

    

    SCNNode *snowblockNode = [SCNNode nodeWithGeometry:snowBlock];

    snowblockNode.physicsBody = [SCNPhysicsBody dynamicBody];

    snowblockNode.physicsBody.velocityFactor = SCNVector3Make(0, 1, 0);

    snowblockNode.physicsBody.angularVelocityFactor = SCNVector3Make(0, 1, 0);

    [self.sceneView.scene.rootNode addChildNode:snowblockNode];

    

    float r = floor * 3;

    float angle = (counter – nextFloorStart) * M_PI / (2.0 * floor);

    float x = r * cos(angle);

    float z = r * sin(angle);

    snowblockNode.position = SCNVector3Make(x, 30, z);

    snowblockNode.rotation = SCNVector4Make(0, 1, 0, M_PI/2.0 – angle);

    

    counter–;

    if (counter < nextFloorStart) floor–;

}

– (void)createLight {

    

    SCNLight *light2 = [SCNLight light];

    light2.type = SCNLightTypeOmni;

    light2.color = [UIColor whiteColor];

    SCNNode *lightNode2 = [SCNNode node];

    lightNode2.light = light2;

    lightNode2.position = SCNVector3Make(0, 40, 80);

    lightNode2.rotation = SCNVector4Make(1, 0, 0, –0.4);

    [self.sceneView.scene.rootNode addChildNode:lightNode2];

    

    

    SCNLight *light = [SCNLight light];

    light.type = SCNLightTypeAmbient;

    light.color = [UIColor colorWithWhite:0.5 alpha:1];

    SCNNode *lightNode = [SCNNode node];

    lightNode.light = light;

    [self.sceneView.scene.rootNode addChildNode:lightNode];

}

– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    [self createSnowDome];

}

#define ColorHex(rgb) [UIColor colorWithRed:((rgb & 0xFF0000) >> 16)/255.0 green:((rgb & 0xFF00) >> 8)/255.0 blue:(rgb & 0xFF)/255.0 alpha: 1.0]

– (UIColor *)color:(int)i {

    switch (i) {

        case 0: return ColorHex(0xFFFFFF);

        case 1: return ColorHex(0xF6FEFF);

        case 2: return ColorHex(0xEA22FA);

        case 3: return ColorHex(0xD6DDE5);

        case 4: return ColorHex(0xC7C5C3);

    }

    return nil;

}

@end