ハーフパイプをボールがくる～っ、ぴょんという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?
override func viewDidLoad() {
super.viewDidLoad()
self.setupScene()
self.createHalfPipe()
self.createCamera()
}
func setupScene() {
let sv = SCNView(frame: self.view.bounds)
sv.scene = SCNScene()
sv.scene?.physicsWorld.speed = 5.0;
sv.backgroundColor = UIColor(hue: 0.3, saturation: 0.1, brightness: 1, alpha: 1)
sv.autoenablesDefaultLighting = true
self.view.addSubview(sv)
self.sceneView = sv
}
func createHalfPipe() {
let r1 = CGFloat(10.0)
let r2 = CGFloat(8.0)
let path = UIBezierPath()
path.moveToPoint(CGPoint(x: r1, y: 0))
for i in 0..<200 {
let angle = Double(i % 100) * M_PI / 100.0
if (i / 100) == 0 {
path.addLineToPoint(CGPoint(x: r1 * CGFloat(cos(angle)), y: r1 * CGFloat(sin(angle))))
} else {
path.addLineToPoint(CGPoint(x: –r2 * CGFloat(cos(angle)), y: r2 * CGFloat(sin(angle))))
}
}
let halfpipe = SCNShape(path: path, extrusionDepth: 50)
halfpipe.firstMaterial?.diffuse.contents = UIColor(white: 0.9, alpha: 1)
halfpipe.firstMaterial?.specular.contents = UIColor.whiteColor()
let halfpipeNode = SCNNode(geometry: halfpipe)
halfpipeNode.transform = SCNMatrix4MakeRotation(Float(M_PI) + 0.1, 1, 0, 0)
halfpipeNode.transform = SCNMatrix4Rotate(halfpipeNode.transform, Float(M_PI)/10.0, 0, 1, 0)
self.sceneView?.scene?.rootNode.addChildNode(halfpipeNode)
halfpipeNode.physicsBody = SCNPhysicsBody.staticBody()
halfpipeNode.physicsBody?.physicsShape = SCNPhysicsShape(geometry: halfpipe, options: [SCNPhysicsShapeTypeKey : SCNPhysicsShapeTypeConcavePolyhedron])
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.position = SCNVector3(x: 0, y: 20, z: 80)
camera.rotation = SCNVector4(x: 1, y: 0, z: 0, w: –0.3)
self.sceneView?.scene?.rootNode.addChildNode(camera)
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
let p = touches.anyObject()!.locationInView(self.sceneView)
// zNear: 1.0, zFar: 100.0
let v = self.sceneView!.unprojectPoint(SCNVector3(x: Float(p.x), y: Float(p.y), z: 0.99))
let ball = SCNSphere(radius: 2)
ball.firstMaterial?.diffuse.contents = UIColor(hue: 0, saturation: 0.3, brightness: 1, alpha: 1)
ball.firstMaterial?.specular.contents = UIColor(hue: 0.2, saturation: 0.1, brightness: 1, alpha: 1)
let ballNode = SCNNode(geometry: ball)
ballNode.position = SCNVector3(x: v.x, y: 40, z: –1)
ballNode.physicsBody = SCNPhysicsBody.dynamicBody()
self.sceneView?.scene?.rootNode.addChildNode(ballNode)
}
}