イスを並べて迷路にしてみる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()
createChars()
createBall()
createCamera()
}
func setupScene() {
let sv = SCNView(frame: view.bounds)
sv.backgroundColor = UIColor(hue: 0.3, saturation: 0.1, brightness: 1, alpha: 1)
sv.scene = SCNScene()
sv.autoenablesDefaultLighting = true
sv.allowsCameraControl = true
sv.delegate = self
view.addSubview(sv)
sceneView = sv
}
func createChars() {
for i in 0…24 {
let x = Float(i % 5) – 2
let z = Float(i / 5) – 2
createChairAtPoint(SCNVector3(x: x, y: 0, z: z))
}
}
func createChairAtPoint(p : SCNVector3) {
let chair = SCNNode()
chair.name = “chair”
chair.position = p
sceneView?.scene?.rootNode.addChildNode(chair)
let hue = arc4random() % 10
let color = UIColor(hue: CGFloat(hue) * 0.1, saturation: 0.3, brightness: 1, alpha: 1)
let seat = SCNCylinder(radius: 0.5, height: 0.1)
seat.firstMaterial?.diffuse.contents = color
let seatNode = SCNNode(geometry: seat)
chair.addChildNode(seatNode)
for i in 0…3 {
let x = 0.45 * cos(Float(M_PI) * 0.5 * Float(i) + Float(M_PI) * 0.25)
let z = 0.45 * sin(Float(M_PI) * 0.5 * Float(i) + Float(M_PI) * 0.25)
let leg = SCNBox(width: 0.1, height: 0.5, length: 0.1, chamferRadius: 0)
leg.firstMaterial?.diffuse.contents = color
let legNode = SCNNode(geometry: leg)
legNode.position = SCNVector3(x: x, y: –0.25, z: z)
chair.addChildNode(legNode)
}
let back = SCNBox(width: 0.7, height: 1, length: 0.1, chamferRadius: 0)
back.firstMaterial?.diffuse.contents = color
let backNode = SCNNode(geometry: back)
backNode.position = SCNVector3(x: 0, y: 0.5, z: –0.4)
chair.addChildNode(backNode)
chair.physicsBody = SCNPhysicsBody.staticBody()
chair.physicsBody?.restitution = 1
}
func createBall() {
let ball = SCNSphere(radius: 0.3)
ball.firstMaterial?.diffuse.contents = UIColor.yellowColor()
let ballNode = SCNNode(geometry: ball)
ballNode.name = “ball”
ballNode.position = SCNVector3(x: –2, y: 0.36, z: 2)
sceneView?.scene?.rootNode.addChildNode(ballNode)
ballNode.physicsBody = SCNPhysicsBody.dynamicBody()
ballNode.physicsBody?.restitution = 1
ballNode.physicsBody?.velocityFactor = SCNVector3(x: 1, y: 0, z: 1)
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.position = SCNVector3(x: 0, y: 8, z: 5)
camera.rotation = SCNVector4(x: 1, y: 0, z: 0, w: –0.3 * Float(M_PI))
sceneView?.scene?.rootNode.addChildNode(camera)
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
if let touch = touches.first as? UITouch {
let p = touch.locationInView(self.sceneView)
if let hit = self.sceneView?.hitTest(p, options: [SCNHitTestSortResultsKey : true])?.first as? SCNHitTestResult {
if hit.node.parentNode!.name == “chair” {
hit.node.parentNode!.runAction(SCNAction.rotateByAngle(-CGFloat(M_PI) * 0.25, aroundAxis: SCNVector3(x: 0, y: 1, z: 0), duration: 0.25))
} else if hit.node.name == “ball” {
hit.node.physicsBody?.applyForce(SCNVector3(x: 0, y: 0, z: –6), impulse: true)
}
}
}
}
func renderer(aRenderer: SCNSceneRenderer, updateAtTime time: NSTimeInterval) {
if let ball = sceneView?.scene?.rootNode.childNodeWithName(“ball”, recursively: false) {
let v = ball.physicsBody!.velocity
if abs(v.x) > abs(v.z) {
ball.physicsBody?.velocity = SCNVector3(x: v.x, y: 0, z: 0)
} else {
ball.physicsBody?.velocity = SCNVector3(x: 0, y: 0, z: v.z)
}
}
}
}