折り紙の提灯を表示する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 ()
@property (nonatomic, weak) SCNView *sceneView;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
[self setupScene];
[self createLamp:[UIColor redColor]];
[self createCamera];
[self createLight];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.backgroundColor = [UIColor colorWithWhite:0.05 alpha:1];
sv.scene = [SCNScene scene];
sv.allowsCameraControl = YES;
// sv.autoenablesDefaultLighting = YES;
[self.view addSubview:sv];
self.sceneView = sv;
}
– (SCNNode *)createLamp:(UIColor *)color {
int n = 20;
float dw = M_PI / (n * 0.5);
float r = 1;
float w = 2.0 * r * sin(dw * 0.5);
float h = 2.8 * w;
SCNNode *lamp = [SCNNode node];
[self.sceneView.scene.rootNode addChildNode:lamp];
for (int i=0; i<n; i++) {
for (int j=0; j<4; j++) {
SCNBox *b = [SCNBox boxWithWidth:w height:h length:0.01 chamferRadius:0];
b.firstMaterial.diffuse.contents = color;
SCNNode *bNode = [SCNNode nodeWithGeometry:b];
bNode.transform = SCNMatrix4MakeTranslation(0, 0, r);
bNode.transform = SCNMatrix4Rotate(bNode.transform, dw * i, 0, 1, 0);
[lamp addChildNode:bNode];
if (j==1) {
bNode.pivot = SCNMatrix4Translate(bNode.pivot, 0, -h * 0.5, 0);
bNode.transform = SCNMatrix4Translate(bNode.transform, 0, h * j – 0.5 * h, 0);
[bNode runAction:[SCNAction group:@[[SCNAction rotateByX:M_PI * 0.2 y:0 z:0 duration:3.8], [SCNAction moveByX:0 y: h – h * cos(0.2 * M_PI) z:0 duration:4.0]]]];
} else if (j==2) {
bNode.pivot = SCNMatrix4Translate(bNode.pivot, 0, h * 0.5, 0);
bNode.transform = SCNMatrix4Translate(bNode.transform, 0, h * j + 0.5 * h, 0);
[bNode runAction:[SCNAction group:@[[SCNAction rotateByX:-M_PI * 0.2 y:0 z:0 duration:3.8], [SCNAction moveByX:0 y: -(h – h * cos(0.2 * M_PI)) z:0 duration:4.0]]]];
} else if (j == 3) {
bNode.transform = SCNMatrix4Translate(bNode.transform, 0, h * j, 0);
[bNode runAction:[SCNAction moveByX:0 y: -(h – h * cos(0.2 * M_PI)) z:0 duration:4.0]];
} else if (j == 0) {
bNode.transform = SCNMatrix4Translate(bNode.transform, 0, h * j, 0);
[bNode runAction:[SCNAction moveByX:0 y: h – h * cos(0.2 * M_PI) z:0 duration:4.0]];
}
}
}
[lamp runAction:[SCNAction repeatActionForever:[SCNAction rotateByX:0 y:M_PI z:0 duration:5.0]]];
return lamp;
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 0, 20);
[self.sceneView.scene.rootNode addChildNode:camera];
}
– (void)createLight {
SCNLight *light = [SCNLight light];
light.type = SCNLightTypeAmbient;
light.color = [UIColor colorWithWhite:0.4 alpha:1];
SCNNode *lightNode = [SCNNode node];
lightNode.light = light;
lightNode.position = SCNVector3Make(0, 0, 30);
[self.sceneView.scene.rootNode addChildNode:lightNode];
SCNLight *light2 = [SCNLight light];
light2.type = SCNLightTypeDirectional;
light2.color = [UIColor colorWithWhite:0.4 alpha:1];
SCNNode *light2Node = [SCNNode node];
light2Node.light = light2;
light2Node.position = SCNVector3Make(0, 0, 80);
[self.sceneView.scene.rootNode addChildNode:light2Node];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
static float hue = 0.25;
if (hue > 1.0) {
return;
}
SCNNode *lamp = [self createLamp:[UIColor colorWithHue:hue saturation:0.7 brightness:1 alpha:1]];
hue += 0.25;
float x = 5 * cos(hue * M_PI * 2.0 + 0.3);
float y = 5 * sin(hue * M_PI * 2.0 + 0.3);
lamp.position = SCNVector3Make(x, y, 0);
}
@end