たつまきみたいにブロックをクルクルまわすiPhoneアプリのサンプルコードを描いてみます。
import UIKit
import SceneKit
class ViewController: UIViewController, SCNSceneRendererDelegate {
weak var sceneView : SCNView?
override func viewDidLoad() {
super.viewDidLoad()
setupScene()
createField()
createBlocks()
createCamera()
}
func setupScene() {
let sv = SCNView(frame: view.bounds)
sv.scene = SCNScene()
sv.delegate = self
view.addSubview(sv)
sceneView = sv
}
func createField() {
let box = SCNBox(width: 20, height: 20, length: 20, chamferRadius: 0)
box.firstMaterial?.diffuse.contents = UIColor.blueColor().colorWithAlphaComponent(0.1)
let boxNode = SCNNode(geometry: box)
boxNode.physicsField = SCNPhysicsField.vortexField()
boxNode.physicsField?.strength = 1
sceneView?.scene?.rootNode.addChildNode(boxNode)
}
func createBlocks() {
let b = SCNBox(width: 10, height: 10, length: 10, chamferRadius: 0)
b.firstMaterial?.diffuse.contents = UIColor(hue: CGFloat(arc4random_uniform(10)) * 0.1, saturation: 0.2, brightness: 1, alpha: 1)
let bnode = SCNNode(geometry: b)
bnode.position = SCNVector3(x: Float(arc4random_uniform(80)) – 40, y: 100, z: Float(arc4random_uniform(80)) – 40)
bnode.physicsBody = SCNPhysicsBody.dynamicBody()
bnode.physicsBody?.damping = 0.4
bnode.physicsBody?.applyForce(SCNVector3(x: 0, y: –70, z: 0), impulse: true)
self.sceneView?.scene?.rootNode.addChildNode(bnode)
delay(10.0) {
bnode.removeFromParentNode()
}
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.camera?.zFar = 600
camera.position = SCNVector3(x: 0, y: 0, z: 200)
sceneView?.scene?.rootNode.addChildNode(camera)
}
var lasttime = 0.0
func renderer(aRenderer: SCNSceneRenderer, updateAtTime time: NSTimeInterval) {
if (time – lasttime > 0.05) {
lasttime = time
self.createBlocks()
}
}
}
extension Array {
func each(doit:T -> Void) { for i in self {doit(i)} }
}
func delay (delay:Double, doit:() -> Void) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(delay * Double(NSEC_PER_SEC))), dispatch_get_main_queue(), doit)
}