ワイヤーを回して幾何模様をつくる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 ()
@property (nonatomic) NSUInteger count;
@property (nonatomic, weak) SCNView *sceneView;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
[self setupScene];
[self createRect];
[self createCamera];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.backgroundColor = [UIColor orangeColor];
sv.scene = [SCNScene scene];
sv.autoenablesDefaultLighting = YES;
sv.allowsCameraControl = YES;
[self.view addSubview:sv];
self.sceneView = sv;
}
– (void)createRect {
for (NSString *name in @[@”rectA”, @”rectB”]) {
SCNNode *rect = [SCNNode node];
rect.name = name;
for (int i=0; i<4; i++) {
SCNBox *pipe = [SCNBox boxWithWidth:20 height:0.5 length:0.5 chamferRadius:0.25];
pipe.firstMaterial.diffuse.contents = [UIColor colorWithWhite:0.98 alpha:1];
SCNNode *pipeNode = [SCNNode nodeWithGeometry:pipe];
pipeNode.pivot = SCNMatrix4MakeTranslation(0, 9.75, 0);
pipeNode.rotation = SCNVector4Make(0, 0, 1, i * M_PI * 0.5);
[rect addChildNode:pipeNode];
}
rect.position = SCNVector3Make([name isEqual:@”rectA”] ? –15 : 15, 0, 0);
[self.sceneView.scene.rootNode addChildNode:rect];
}
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 0, 60);
[self.sceneView.scene.rootNode addChildNode:camera];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if (self.count > 0) {
return;
}
[NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(turn:) userInfo:nil repeats:YES];
}
– (void)turn:(NSTimer *)timer {
float dw = M_PI / 20.0;
SCNNode *rect = [self.sceneView.scene.rootNode childNodeWithName:@”rectA” recursively:NO];
SCNNode *newRect = [rect clone]; // copy
[self.sceneView.scene.rootNode addChildNode:newRect];
[rect runAction:[SCNAction rotateByAngle:dw aroundAxis:SCNVector3Make(0, 0, 1) duration:0.2]];
SCNNode *rectB = [self.sceneView.scene.rootNode childNodeWithName:@”rectB” recursively:NO];
SCNNode *newRectB = [rectB clone]; // copy
[self.sceneView.scene.rootNode addChildNode:newRectB];
[rectB runAction:[SCNAction rotateByAngle:2.0 * dw aroundAxis:SCNVector3Make(1, 0, 1) duration:0.2]];
self.count++;
if (self.count > 20) {
[timer invalidate];
}
}
@end