3D-playground.swift

import SceneKit
import PlaygroundSupport

var sceneView = SCNView()
PlaygroundPage.current.liveView = sceneView
var scene = SCNScene()
sceneView.scene = scene

var object = SCNBox(width: 10, height: 10, length: 10, chamferRadius: 1)
var objectMaterial = object.firstMaterial!
objectMaterial.diffuse.contents  = UIColor.systemPurple
objectMaterial.lightingModel = .physicallyBased
var objectNode = SCNNode(geometry: object)
objectNode.rotation = SCNVector4(x: 0.5, y: 1, z: 0, w: 0)
scene.rootNode.addChildNode(objectNode)

var background = SCNBox(width: 40, height: 40, length: 1, chamferRadius: 0)
var backgroundMaterial = background.firstMaterial!
backgroundMaterial.diffuse.contents = UIColor.systemYellow
backgroundMaterial.lightingModel = .physicallyBased
var backgroundNode = SCNNode(geometry: background)
backgroundNode.position = SCNVector3(x: 0, y: 0, z: -10)
scene.rootNode.addChildNode(backgroundNode)

var spin = CABasicAnimation(keyPath: "rotation.w")
spin.toValue = 2 * CGFloat.pi
spin.duration = 5
spin.repeatCount = .greatestFiniteMagnitude
objectNode.addAnimation(spin, forKey: "spin")

var light = SCNLight()
light.type = .directional
var lightNode = SCNNode()
lightNode.light = light
scene.rootNode.addChildNode(lightNode)

var camera = SCNCamera()
var cameraNode = SCNNode()
cameraNode.camera = camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 20)
scene.rootNode.addChildNode(cameraNode)