縞模様の棒をつかって、しましまなオブジェを表示する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 () <SCNSceneRendererDelegate>
@property (nonatomic, weak) SCNView *sceneView;
@property (nonatomic) BOOL turn;
@property (nonatomic) BOOL start;
@property (nonatomic) int counter;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
[self setupScene];
[self createBar];
[self createCamera];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.backgroundColor = [UIColor colorWithWhite:0.05 alpha:1];
sv.scene = [SCNScene scene];
sv.scene.physicsWorld.gravity = SCNVector3Zero;
sv.allowsCameraControl = YES;
sv.autoenablesDefaultLighting = YES;
sv.delegate = self;
[self.view addSubview:sv];
self.sceneView = sv;
}
– (void)createBar {
SCNNode *sBar = [SCNNode node];
sBar.name = @”bar”;
[self.sceneView.scene.rootNode addChildNode:sBar];
for (int i=0; i<10; i++) {
SCNCylinder *c = [SCNCylinder cylinderWithRadius:0.2 height:0.2];
c.firstMaterial.diffuse.contents = [UIColor colorWithHue:0.35 saturation:0.4 brightness:1 alpha:1];
SCNNode *cNode = [SCNNode nodeWithGeometry:c];
cNode.rotation = SCNVector4Make(0, 0, 1, M_PI * 0.5);
cNode.position = SCNVector3Make(i * 0.4, 0, 0);
[sBar addChildNode:cNode];
}
sBar.physicsBody = [SCNPhysicsBody dynamicBody];
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, –10, 30);
[self.sceneView.scene.rootNode addChildNode:camera];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if (!self.start) {
self.start = YES;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(8.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.start = NO;
});
}
self.turn = YES;
}
– (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
self.turn = NO;
}
– (void)renderer:(id<SCNSceneRenderer>)aRenderer updateAtTime:(NSTimeInterval)time {
SCNNode *bar = [self.sceneView.scene.rootNode childNodeWithName:@”bar” recursively:NO];
if (!self.start) {
bar.physicsBody.velocity = SCNVector3Make(0, 0, 0);
return;
}
bar.physicsBody.velocity = SCNVector3Make(0, –1, 0);
if (self.turn) {
bar.physicsBody.angularVelocity = SCNVector4Make(0, 1, 0, 1);
} else {
bar.physicsBody.angularVelocity = SCNVector4Zero;
}
if (self.counter == 5) {
SCNNode *barClone = bar.presentationNode.clone;
barClone.physicsBody = nil;
[self.sceneView.scene.rootNode addChildNode:barClone];
self.counter = 0;
}
self.counter++;
}
@end