GameViewController.swift

import SceneKit
import QuartzCore

class GameViewController: NSViewController {
    
    @IBOutlet weak var gameView: GameView!
    
    override func awakeFromNib(){
        var scene = SCNScene()

        var camera = SCNCamera()
        var cameraNode = SCNNode()
        cameraNode.camera = camera
        cameraNode.position = SCNVector3(x: 0, y: 0, z: 2)
        scene.rootNode.addChildNode(cameraNode)
        
        for i in 0..<100 {
            var box = SCNBox(width: 1, height: 1, length: 1, chamferRadius: 0.03)
            box.firstMaterial.diffuse.contents = NSColor(
                calibratedHue: randomCGFloat(),
                saturation: randomCGFloat() * 0.5 + 0.5, brightness: 2.0, alpha: 0.75)
            box.firstMaterial.specular.contents = NSColor.whiteColor()
            
            var boxNode = SCNNode(geometry: box)
            boxNode.rotation = SCNVector4(x: randomCGFloat(), y: randomCGFloat(), z: randomCGFloat(), w: CGFloat(M_PI));
            boxNode.runAction(SCNAction.repeatActionForever(
                SCNAction.rotateByAngle(
                    CGFloat(M_PI * 2.0),
                    aroundAxis: SCNVector3(x: randomCGFloat(), y: randomCGFloat(), z: randomCGFloat()),
                    duration: NSTimeInterval(randomCGFloat() * 10.0 + 10.0))))
            
            scene.rootNode.addChildNode(boxNode)
        }
        
        self.gameView!.scene = scene
        self.gameView!.allowsCameraControl = true
        self.gameView!.showsStatistics = true
        self.gameView!.backgroundColor = NSColor.blackColor()
    }
    
    func randomCGFloat() -> CGFloat {
        return CGFloat(arc4random()) /  CGFloat(UInt32.max)
    }
}