並んだピンを車で倒す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 {
weak var sceneView : SCNView?
weak var mviechle : SCNPhysicsVehicle?
override func viewDidLoad() {
super.viewDidLoad()
setupScene()
createBoard()
createCar()
createPin()
createCamera()
}
func setupScene() {
let sv = SCNView(frame: view.bounds)
sv.backgroundColor = UIColor(hue: 0.3, saturation: 0.02, brightness: 1, alpha: 1)
sv.scene = SCNScene()
sv.preferredFramesPerSecond = 30
sv.autoenablesDefaultLighting = true
view.addSubview(sv)
self.sceneView = sv
}
func createBoard() {
let board = SCNBox(width: 120, height: 1, length: 120, chamferRadius: 0)
board.firstMaterial?.diffuse.contents = UIColor(hue: 0.3, saturation: 0.2, brightness: 1, alpha: 1)
let boardNode = SCNNode(geometry: board)
boardNode.physicsBody = SCNPhysicsBody.staticBody()
sceneView?.scene?.rootNode.addChildNode(boardNode)
let boardFrameNode = SCNNode()
for i in 0..<4 {
let boardFrame = SCNBox(width: 120, height: 5, length: 2, chamferRadius: 0)
boardFrame.firstMaterial?.diffuse.contents = UIColor(hue: 0.14, saturation: 0.6, brightness: 0.8, alpha: 1)
let boardFrameNode = SCNNode(geometry: boardFrame)
boardFrameNode.transform = SCNMatrix4Translate(boardFrameNode.transform, 0, 0, 60 – 40 * Float((i % 2)))
boardFrameNode.transform = SCNMatrix4Rotate(boardFrameNode.transform, Float(M_PI / 2.0) * Float(i), 0, 1, 0)
boardFrameNode.physicsBody = SCNPhysicsBody.staticBody()
sceneView?.scene?.rootNode.addChildNode(boardFrameNode)
}
}
func createCar() {
let v = SCNNode()
v.position = SCNVector3(x: 0, y: 10, z: 30)
sceneView?.scene?.rootNode.addChildNode(v)
let body = SCNBox(width: 1.4, height: 1, length: 4, chamferRadius: 0.01)
body.firstMaterial?.diffuse.contents = UIColor(hue: 0, saturation: 0.8, brightness: 1, alpha: 1)
let bodyNode = SCNNode(geometry: body)
v.addChildNode(bodyNode)
var wheels = [SCNPhysicsVehicleWheel]()
let wp = [SCNVector3(x: 1.2, y: –0.2, z: 1.1), SCNVector3(x: –1.2, y: –0.2, z: 1.1), SCNVector3(x: 1.2, y: –0.2, z: –1.1), SCNVector3(x: –1.2, y: –0.2, z: –1.1)]
for i in 0..<4 {
let wheel = SCNSphere(radius: 0.4)
wheel.firstMaterial?.diffuse.contents = UIColor.blackColor()
let wheelNode = SCNNode(geometry: wheel)
v.addChildNode(wheelNode)
let w = SCNPhysicsVehicleWheel(node: wheelNode)
w.axle = SCNVector3(x: 1, y: 0, z: 0)
w.connectionPosition = wp[i]
w.suspensionRestLength = 0.01
w.frictionSlip = 0.6
wheels.append(w)
let bar = SCNBox(width: 0.5, height: 1, length: 1, chamferRadius: 0)
bar.firstMaterial?.diffuse.contents = UIColor.grayColor()
let barNode = SCNNode(geometry: bar)
wheelNode.addChildNode(barNode)
}
v.physicsBody = SCNPhysicsBody.dynamicBody()
let vehicle = SCNPhysicsVehicle(chassisBody: v.physicsBody, wheels: wheels)
sceneView?.scene?.physicsWorld.addBehavior(vehicle)
mviechle = vehicle
}
func createPin() {
for i in 0..<5 {
let pin = SCNCylinder(radius: 2, height: 10)
pin.firstMaterial?.diffuse.contents = UIColor(hue: 0.1, saturation: 0.3, brightness: 1, alpha: 1)
let pinNode = SCNNode(geometry: pin)
pinNode.position = SCNVector3(x: –8 + 4 * Float(i), y: 6, z: –50 + Float(i%2) * 8)
pinNode.physicsBody = SCNPhysicsBody.dynamicBody()
pinNode.physicsBody?.mass = 0.1
sceneView?.scene?.rootNode.addChildNode(pinNode)
}
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.camera?.zFar = 400
camera.position = SCNVector3(x: 0, y: 30, z: 60)
camera.rotation = SCNVector4(x: 1, y: 0, z: 0, w: –0.4)
sceneView?.scene?.rootNode.addChildNode(camera)
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
mviechle?.applyEngineForce(40, forWheelAtIndex: 0)
mviechle?.applyEngineForce(40, forWheelAtIndex: 1)
mviechle?.applyEngineForce(40, forWheelAtIndex: 2)
mviechle?.applyEngineForce(40, forWheelAtIndex: 3)
}
}