円筒の中でボールをまぜまぜする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;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [self color:0];
[self createScene];
[self createCup];
[self createMuddler];
[self createCamera];
}
– (void)createScene {
float w = CGRectGetMaxX(self.view.bounds);
SCNView *sv = [[SCNView alloc] initWithFrame:CGRectMake(0, 0, w, w)];
sv.backgroundColor = [self color:1];
sv.scene = [SCNScene scene];
[self.view addSubview:sv];
self.scene = sv.scene;
}
– (void)createCup {
SCNTube *tube = [SCNTube tubeWithInnerRadius:10 outerRadius:11 height:20];
tube.firstMaterial.diffuse.contents = [[self color:2] colorWithAlphaComponent:0.2];
SCNNode *tubeNode = [SCNNode nodeWithGeometry:tube];
tubeNode.physicsBody = [SCNPhysicsBody staticBody];
tubeNode.physicsBody.physicsShape = [SCNPhysicsShape shapeWithGeometry:tube options:@{SCNPhysicsShapeTypeKey: SCNPhysicsShapeTypeConcavePolyhedron}];
[self.scene.rootNode addChildNode:tubeNode];
SCNCylinder *bottom = [SCNCylinder cylinderWithRadius:10 height:1];
bottom.firstMaterial.diffuse.contents = [[self color:2] colorWithAlphaComponent:0.2];
SCNNode *bottomNode = [SCNNode nodeWithGeometry:bottom];
bottomNode.position = SCNVector3Make(0, –10, 0);
bottomNode.name = @”bottom”;
bottomNode.physicsBody = [SCNPhysicsBody staticBody];
[self.scene.rootNode addChildNode:bottomNode];
}
– (void)createMuddler {
SCNCylinder *muddler = [SCNCylinder cylinderWithRadius:0.5 height:18];
muddler.firstMaterial.diffuse.contents = [self color:3];
SCNNode *muddlerNode = [SCNNode nodeWithGeometry:muddler];
muddlerNode.rotation = SCNVector4Make(0, 0, 1, M_PI/2.0);
muddlerNode.position = SCNVector3Make(0, –8, 0);
[self.scene.rootNode addChildNode:muddlerNode];
muddlerNode.physicsBody = [SCNPhysicsBody staticBody];
[muddlerNode runAction:[SCNAction repeatActionForever:[SCNAction rotateByAngle:M_PI aroundAxis:SCNVector3Make(0, 1, 0) duration:2.0]]];
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 20, 50);
[self.scene.rootNode addChildNode:camera];
camera.constraints = @[[SCNLookAtConstraint lookAtConstraintWithTarget:[self.scene.rootNode childNodeWithName:@”bottom” recursively:NO]]];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
SCNSphere *ball = [SCNSphere sphereWithRadius:1];
if (arc4random()%2){
ball.firstMaterial.diffuse.contents = [self color:4];
} else {
ball.firstMaterial.diffuse.contents = [UIColor whiteColor];
}
SCNNode *ballNode = [SCNNode nodeWithGeometry:ball];
ballNode.position = SCNVector3Make(5, 10, 0);
[self.scene.rootNode addChildNode:ballNode];
ballNode.physicsBody = [SCNPhysicsBody dynamicBody];
ballNode.physicsBody.damping = 0.7;
}
#define ColorHex(rgb) [UIColor colorWithRed:((rgb & 0xFF0000) >> 16)/255.0 green:((rgb & 0xFF00) >> 8)/255.0 blue:(rgb & 0xFF)/255.0 alpha:1]
– (UIColor *)color:(int)i {
switch (i) {
case 0: return ColorHex(0x56626B);
case 1: return ColorHex(0x6C9380);
case 2: return ColorHex(0xC0CA55);
case 3: return ColorHex(0xF07C6C);
case 4: return ColorHex(0xAD5472);
default:
break;
}
return nil;
}
@end