叩くとボールがとびだす箱を表示する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) SCNScene *scene;
@property (nonatomic, weak) SCNNode *boxfront;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [self color:3];
[self setupScene];
[self createBallBox];
[self createCamera];
[self createLight];
[self createBall];
}
– (void)setupScene {
float w = CGRectGetMaxX(self.view.bounds);
SCNView *sv = [[SCNView alloc] initWithFrame:CGRectMake(0, 0, w, w)];
sv.backgroundColor = [self color:0];
sv.scene = [SCNScene scene];
[self.view addSubview:sv];
self.scene = sv.scene;
}
– (void)createBallBox {
SCNBox *box = [SCNBox boxWithWidth:20 height:0.5 length:20 chamferRadius:0];
box.firstMaterial.diffuse.contents = [self color:2];
for (int i=0; i<6; i++) {
SCNNode *boxNode = [SCNNode nodeWithGeometry:box];
boxNode.physicsBody = [SCNPhysicsBody staticBody];
boxNode.transform = SCNMatrix4Translate(boxNode.transform, 0, 10.6, 0);
if (i < 4) {
float angle = (M_PI / 2.0) * i;
boxNode.transform = SCNMatrix4Rotate(boxNode.transform, angle, 0, 0, 1);
} else {
float angle = (M_PI) * (i – 4) + M_PI / 2.0;
boxNode.transform = SCNMatrix4Rotate(boxNode.transform, angle, –1, 0, 0);
}
[self.scene.rootNode addChildNode:boxNode];
}
SCNNode *front = self.scene.rootNode.childNodes.lastObject;
front.physicsBody = [SCNPhysicsBody dynamicBody];
front.physicsBody.physicsShape = [SCNPhysicsShape shapeWithGeometry:front.geometry options:nil];
SCNPhysicsHingeJoint *joint = [SCNPhysicsHingeJoint jointWithBody:front.physicsBody axis:SCNVector3Make(1, 0, 0) anchor:SCNVector3Make(0, 0, 10)];
[self.scene.physicsWorld addBehavior:joint];
self.boxfront = front;
}
– (void)createBall {
SCNSphere *ball = [SCNSphere sphereWithRadius:5];
ball.firstMaterial.diffuse.contents = [self color:4];
SCNNode *ballNode = [SCNNode nodeWithGeometry:ball];
ballNode.name = @”ball”;
ballNode.physicsBody = [SCNPhysicsBody dynamicBody];
ballNode.physicsBody.physicsShape = [SCNPhysicsShape shapeWithGeometry:ball options:nil];
[self.scene.rootNode addChildNode:ballNode];
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 15, 60);
camera.rotation = SCNVector4Make(1, 0, 0, –0.3);
[self.scene.rootNode addChildNode:camera];
}
– (void)createLight {
SCNLight *light = [SCNLight light];
light.type = SCNLightTypeSpot;
SCNNode *lightNode = [SCNNode node];
lightNode.light= light;
lightNode.position = SCNVector3Make(0, 0, 80);
[self.scene.rootNode addChildNode:lightNode];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.boxfront.physicsBody applyForce:SCNVector3Make(0, 0, 5) atPosition:SCNVector3Make(0, 15, 0) impulse:YES];
SCNNode *ball = [self.scene.rootNode childNodeWithName:@”ball” recursively:NO];
[ball.physicsBody applyForce:SCNVector3Make(0, 0, 30) atPosition:SCNVector3Make(0, 5, 0) impulse:YES];
}
#define ColorHex(rgb) [UIColor colorWithRed:((rgb & 0xFF0000) >> 16)/255.0 green:((rgb & 0xFF00) >> 8)/255.0 blue:(rgb & 0xFF)/255.0 alpha:1.0]
– (UIColor *)color:(int)i {
switch (i) {
case 0: return ColorHex(0x703030);
case 1: return ColorHex(0x2F343B);
case 2: return ColorHex(0x7E827A);
case 3: return ColorHex(0xE3CDA4);
case 4: return ColorHex(0xC77966);
default:
break;
}
return nil;
}
@end