玉の中をグラフのように色付けする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 ()
@property (nonatomic, weak) SCNView *sceneView;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
[self setupScene];
[self createSphere];
[self createCamera];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.scene = [SCNScene scene];
sv.autoenablesDefaultLighting = YES;
sv.allowsCameraControl = YES;
[self.view addSubview:sv];
self.sceneView = sv;
}
– (void)createSphere {
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:5 startAngle:0 endAngle:M_PI clockwise:NO];
path.flatness = 0.1;
SCNShape *shape = [SCNShape shapeWithPath:path extrusionDepth:0.4];
shape.firstMaterial.diffuse.contents = [UIColor darkGrayColor];
UIBezierPath *path2 = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:4 startAngle:0 endAngle:M_PI clockwise:NO];
path2.flatness = 0.02;
SCNShape *shapeRed = [SCNShape shapeWithPath:path2 extrusionDepth:0.41];
shapeRed.firstMaterial.diffuse.contents = [UIColor redColor];
UIBezierPath *path3 = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:2.5 startAngle:0 endAngle:M_PI clockwise:NO];
path3.flatness = 0.02;
SCNShape *shapeGreen = [SCNShape shapeWithPath:path3 extrusionDepth:0.42];
shapeGreen.firstMaterial.diffuse.contents = [UIColor greenColor];
float dw = M_PI / 50.0;
for (int i=0; i<100; i++) {
SCNNode *arcNode = [SCNNode nodeWithGeometry:shape];
arcNode.transform = SCNMatrix4Rotate(arcNode.transform, i * dw, 1, 0, 0);
arcNode.name = [NSString stringWithFormat:@”no%d”, i];
[self.sceneView.scene.rootNode addChildNode:arcNode];
if (i==74 || i==75) {
SCNNode *sub1 = [SCNNode nodeWithGeometry:shapeRed];
[arcNode addChildNode:sub1];
SCNNode *sub2 = [SCNNode nodeWithGeometry:shapeGreen];
[arcNode addChildNode:sub2];
}
}
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 0, 30);
[self.sceneView.scene.rootNode addChildNode:camera];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.sceneView.scene.rootNode.childNodes enumerateObjectsUsingBlock:^(SCNNode *n, NSUInteger idx, BOOL *stop) {
if ([n.name hasPrefix:@”no”] && [[n.name substringFromIndex:2] intValue] >= 75) {
[n runAction:[SCNAction rotateToX:0 y:0 z:0 duration:1.0]];
}
}];
}
@end