カードでタワーを表示して、パラパラ崩す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 createDesk];
[self createCards];
[self createCamera];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.scene = [SCNScene scene];
sv.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1];
sv.autoenablesDefaultLighting = true;
sv.allowsCameraControl = true;
[self.view addSubview:sv];
self.sceneView = sv;
}
– (void)createDesk {
SCNCylinder *desk = [SCNCylinder cylinderWithRadius:3 height:0.2];
desk.firstMaterial.diffuse.contents = [UIColor brownColor];
SCNNode *deskNode = [SCNNode nodeWithGeometry:desk];
[self.sceneView.scene.rootNode addChildNode:deskNode];
deskNode.physicsBody = [SCNPhysicsBody staticBody];
}
– (void)createCards {
float delay = 0;
float l = 0.6, h = l * 1.4;
int count = 10, n = 10;
float angle = M_PI * 0.115;
float h0 = h * cos(angle);
float l0 = h * sin(angle) * 0.5;
for (int i=0; i<n; i++) {
for (int j=0; j<count; j++) {
float x = j * l – l * 4.5 + (n – count) * l * 0.5;
float y = i * h0 + h0 * 0.5;
SCNBox *card = [SCNBox boxWithWidth:0.02 height:h length:l chamferRadius:0.01];
float hue = (arc4random() % 100) * 0.01;
card.firstMaterial.diffuse.contents = [UIColor colorWithHue:hue saturation:0.1 brightness:1 alpha:1];
card.firstMaterial.specular.contents = [UIColor redColor];
SCNNode *cardNode = [SCNNode nodeWithGeometry:card];
cardNode.name = @”card”;
cardNode.position = SCNVector3Make(x + l0, y, 0);
cardNode.rotation = SCNVector4Make(0, 0, 1, angle);
SCNNode *cardNode2 = [SCNNode nodeWithGeometry:card];
cardNode2.name = @”card”;
cardNode2.position = SCNVector3Make(x – l0, y, 0);
cardNode2.rotation = SCNVector4Make(0, 0, 1, -angle);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delay * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.sceneView.scene.rootNode addChildNode:cardNode];
[self.sceneView.scene.rootNode addChildNode:cardNode2];
});
delay += 0.04;
}
count–;
}
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 4, 10);
[self.sceneView.scene.rootNode addChildNode:camera];
}
– (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
for (SCNNode *n in self.sceneView.scene.rootNode.childNodes) {
if ([n.name isEqual:@”card”]) {
n.physicsBody = [SCNPhysicsBody dynamicBody];
n.physicsBody.damping = 0.97;
}
}
}
@end