星がくるくる回っている中に入っていく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 createPlate];
[self createDome];
[self createStella];
[self createCamera];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.backgroundColor = [UIColor blackColor];
sv.scene = [SCNScene scene];
sv.autoenablesDefaultLighting = YES;
sv.allowsCameraControl = YES;
[self.view addSubview:sv];
self.sceneView = sv;
}
– (void)createPlate {
SCNCylinder *plate = [SCNCylinder cylinderWithRadius:5 height:0.1];
plate.firstMaterial.diffuse.contents = [[UIColor whiteColor] colorWithAlphaComponent:0.4];
SCNNode *plateNode = [SCNNode nodeWithGeometry:plate];
[self.sceneView.scene.rootNode addChildNode:plateNode];
}
– (void)createDome {
SCNSphere *sphere = [SCNSphere sphereWithRadius:4];
sphere.firstMaterial.diffuse.contents = [[UIColor whiteColor] colorWithAlphaComponent:0.5];
SCNNode *sphereNode = [SCNNode nodeWithGeometry:sphere];
[self.sceneView.scene.rootNode addChildNode:sphereNode];
}
– (void)createStella {
for (int i=0; i<60; i++) {
float r = 4;
float t = (arc4random() % 360);
float phi = (arc4random() % 360);
float sr = (arc4random() % 5) * 0.01;
SCNSphere *star = [SCNSphere sphereWithRadius:sr];
star.firstMaterial.diffuse.contents = [UIColor whiteColor];
SCNNode *starNode = [SCNNode nodeWithGeometry:star];
starNode.position = [self sphericalCoordinateTheata:t phi:phi r:r];
[self.sceneView.scene.rootNode addChildNode:starNode];
}
}
– (SCNVector3)sphericalCoordinateTheata:(float)t phi:(float)p r:(float)r {
t = M_PI * (t / 180);
p = M_PI * (p / 180);
float x = r * sin(t) * cos(p);
float y = r * sin(t) * sin(p);
float z = r * cos(t);
return SCNVector3Make(x, y, z);
}
– (void)createCamera {
SCNNode *cameraBall = [SCNNode node];
cameraBall.name = @”camera ball”;
[self.sceneView.scene.rootNode addChildNode:cameraBall];
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 5, 16);
camera.rotation = SCNVector4Make(1, 0, 0, –0.1 * M_PI);
[cameraBall addChildNode:camera];
[cameraBall runAction:[SCNAction repeatActionForever:[SCNAction rotateByAngle:M_PI aroundAxis:SCNVector3Make(0, 1, 0.1) duration:3.0]]];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
SCNNode *camera = [self.sceneView.scene.rootNode childNodeWithName:@”camera ball” recursively:false].childNodes[0];
[camera runAction:[SCNAction moveTo:SCNVector3Zero duration:4.0]];
}
@end