Purple.swift

import SceneKit
import QuartzCore

@NSApplicationMain class AppDelegate: NSObject, NSApplicationDelegate {
    var c: NSWindowController!
    func applicationDidFinishLaunching(_ a: Notification) {
        let w = NSWindow.init(contentRect: NSMakeRect(100, 100, 400, 400), styleMask: [.closable, .titled], backing: .buffered, defer: false)
        c = NSWindowController(window: w)
        c.showWindow(self)
        w.makeKeyAndOrderFront(nil)

        let scene = SCNScene()
        let cameraNode = SCNNode()
        cameraNode.camera = SCNCamera()
        scene.rootNode.addChildNode(cameraNode)
        cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
        let lightNode = SCNNode()
        lightNode.light = SCNLight()
        lightNode.light!.type = .omni
        lightNode.light!.color = NSColor.purple
        lightNode.light!.intensity = 4000
        lightNode.position = SCNVector3(x: 0, y: 3, z: 10)
        scene.rootNode.addChildNode(lightNode)
        let boxGeometry = SCNBox(width: 10.0, height: 10.0, length: 10.0, chamferRadius: 1.0)
        let boxNode = SCNNode(geometry: boxGeometry)
        scene.rootNode.addChildNode(boxNode)
        boxNode.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))

        let scnView = SCNView(frame: w.contentView!.bounds)
        scnView.scene = scene
        scnView.allowsCameraControl = true
        scnView.showsStatistics = true
        scnView.backgroundColor = NSColor.black
        w.contentView?.addSubview(scnView)
    }
}