ポールのにそって箱が落ちていく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 scene : SCNScene?
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor(hue: 0.4, saturation: 0.5, brightness: 0.8, alpha: 1)
self.setupScene()
self.createPole()
self.createCamera()
}
func setupScene() {
let w = CGRectGetMaxX(self.view.bounds)
let sv = SCNView(frame: CGRect(x: 0, y: 0, width: w, height: w));
sv.scene = SCNScene()
sv.backgroundColor = UIColor(hue: 0, saturation: 0.05, brightness: 1.0, alpha: 1)
sv.delegate = self
self.view.addSubview(sv)
self.scene = sv.scene
}
func createPole() {
let pole = SCNCylinder(radius: 1, height: 100)
pole.firstMaterial?.diffuse.contents = UIColor(hue: 0.4, saturation: 0.5, brightness: 0.8, alpha: 1)
let poleNode = SCNNode(geometry: pole)
poleNode.name = “pole”
self.scene?.rootNode.addChildNode(poleNode)
poleNode.physicsBody = SCNPhysicsBody.staticBody()
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.camera?.zFar = 150
camera.position = SCNVector3(x: 0, y: 0, z: 100)
self.scene?.rootNode.addChildNode(camera)
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
let box = SCNBox(width: 5, height: 5, length: 5, chamferRadius: 0)
let hue = CGFloat(arc4random() % 10) * 0.1
box.firstMaterial?.diffuse.contents = UIColor(hue: hue, saturation: 0.6, brightness: 1.0, alpha: 1)
let boxNode = SCNNode(geometry: box)
boxNode.name = “box”
boxNode.position = SCNVector3(x: 20, y: 50, z: 20)
self.scene?.rootNode.addChildNode(boxNode)
boxNode.physicsBody = SCNPhysicsBody.dynamicBody()
boxNode.physicsBody?.velocity = SCNVector3(x: 0, y: 0, z: 50)
}
func renderer(aRenderer: SCNSceneRenderer, willRenderScene scene: SCNScene, atTime time: NSTimeInterval) {
let pole = scene.rootNode.childNodeWithName(“pole”, recursively: false)
scene.rootNode.enumerateChildNodesUsingBlock { (node, p) -> Void in
if node.name == “box” {
let vx = –5.0 * node.presentationNode().position.x;
let vz = –5.0 * node.presentationNode().position.z;
let v = SCNVector3(x: vx, y: 3, z: vz)
node.physicsBody?.applyForce(v, impulse: false)
if node.presentationNode().position.y < –100 {
node.removeFromParentNode()
}
}
}
}
}