Xcode SceneKit Shadows Will Not Render - scenekit

Question

I am creating a simple project using SceneKit and cannot get any shadows to appear in the Scene Editor or in the compiled application no matter what I try.
I have tried creating a simple box, placing it on a plane and adding a spot light. Code would be as follows:
// Create some properties
var scnView: SCNView!
var scnMasterScene: SCNScene!
var boxNode: SCNNode!
var cameraPerspNode: SCNNode!
var cameraOrthNode: SCNNode!
func applicationDidFinishLaunching(aNotification: NSNotification) {
// Insert code here to initialize your application
setupView()
createAndAddBoxScene()
setupCamera()
createAndAddSpotLight()
}
// Setup the view.
func setupView() {
scnView = self.sceneView as SCNView
// Set the scnView properties.
scnView.showsStatistics = true
scnView.autoenablesDefaultLighting = false
scnView.allowsCameraControl = true
// Create a Master scene.
scnMasterScene = SCNScene()
// Set the scene view's scene node to the master scene.
scnView.scene = scnMasterScene
}
// Setup the scene.
func createAndAddBoxScene() {
// Create a box of type SCNGeometry
let boxGeometry: SCNGeometry = SCNBox(width: 2000, height: 2000, length: 2000, chamferRadius: 100)
// Add a difuse colour to the box' first material.
boxGeometry.firstMaterial?.diffuse.contents = NSColor.redColor()
// Create a node of type SCNNode and attach the boxGeometry to it.
// Note: A node can only have 1 geometry object attached to it.
boxNode = SCNNode(geometry: boxGeometry)
// Add the new boxNode to the scene's root node.
scnMasterScene.rootNode.addChildNode(boxNode)
// Create a floor plane.
let floorGeometry: SCNGeometry = SCNPlane(width: 20000, height: 20000)
// Add a difuse colour to the floor's first material.
floorGeometry.firstMaterial?.diffuse.contents = NSColor.yellowColor()
// Create a floorPlaneNode and attach the floor plane to it.
let floorNode: SCNNode = SCNNode(geometry: floorGeometry)
// Tilt the floorPlaneNode in x.
let floorNodeTiltDegreesX: Double = -90
let floorNodeTiltRadiansX: Double = floorNodeTiltDegreesX * (π/180)
floorNode.rotation = SCNVector4Make(1, 0, 0, CGFloat(floorNodeTiltRadiansX))
// Add the floorPlaneNode to the master scene.
scnMasterScene.rootNode.addChildNode(floorNode)
}
// Create a camera, position it and add it to the scene.
func setupCamera() {
// Create a camera node which will be used to contain the camera.
cameraPerspNode = SCNNode()
// Create a new camera.
let cameraPersp: SCNCamera = SCNCamera()
// Set camera properties.
cameraPersp.name = "myPerspCamera"
cameraPersp.usesOrthographicProjection = false
cameraPersp.orthographicScale = 9
cameraPersp.xFov = 30
cameraPersp.zNear = 1
cameraPersp.zFar = 20000
// Assign the camera to the .camera property of the node.
cameraPerspNode.camera = cameraPersp
// Set the position and rotation of the camera node (NOT the camera).
cameraPerspNode.position = SCNVector3(x: 0, y: 4000, z: 6000)
let cameraPerspTiltDegrees: Double = -30
let cameraPerspTiltRadians: Double = cameraPerspTiltDegrees * (π/180)
cameraPerspNode.rotation = SCNVector4Make(1, 0, 0, CGFloat(cameraPerspTiltRadians))
// Add the new cameraNode to the scene's root.
scnMasterScene.rootNode.addChildNode(cameraPerspNode)
}
func createAndAddSpotLight() -> Void {
let spot = SCNLight()
spot.type = SCNLightTypeSpot
spot.castsShadow = true
spot.color = NSColor(hue: 1, saturation: 0, brightness: 0, alpha: 1)
spot.spotInnerAngle = 30
spot.spotOuterAngle = 60
let spotNode = SCNNode()
spotNode.light = spot
spotNode.position = SCNVector3(x: 0, y: 2000, z: 2000)
let lookAt = SCNLookAtConstraint(target: boxNode)
spotNode.constraints = [lookAt]
}
If I bring in a .dae filed add a spot light, or directional light, using the Scene Editor I can light the scene but there are no shadows when I set the Cast Shadows property in the Attributes Inspector.
Can anyone shine any light on my problem?
Thanks

Answer 1

The scene is large because the 3D model has been created at 1:1 and it depicts a large building. After much trial and error I finally found the solution - I changed the scale of the light to 10, 10, 10 and the shadows appeared.

Answer 2

the dimensions in your scene are huge (in SceneKit 1 unit = 1 meter). You'll want to change your light's zFar property (and probably zNear too) accordingly.