Hi,
I am hoping someone can tell me if this is a bug or if I am doing something wrong. Below is a simplified demonstration of the error I am experiencing when attempting to replace a flattened clone with an updated version in my SceneKit app. Each renderer update produces an objc_weak_error to be printed to the console:
objc[1104]: __weak variable at 0x281c48d10 holds 0x28164abc0 instead of 0x28164ac60. This is probably incorrect use of objc_storeWeak() and objc_loadWeak(). Break on objc_weak_error to debug.
If I break on the error, the break occurs on the rendering thread but the stack trace appears almost empty. Below is a simplified UIViewController that causes the error.
import SceneKit
class ViewController: UIViewController, SCNSceneRendererDelegate {
let sceneView = SCNView()
let scene = SCNScene()
var node: SCNNode = {
let sphere = SCNSphere(radius: 1)
sphere.materials.first?.diffuse.contents = UIColor.blue
let node = SCNNode(geometry: sphere)
node.position = SCNVector3(0, 0, -20)
return node
}()
var flattenedNode: SCNNode?
override func viewDidLoad() {
super.viewDidLoad()
sceneView.frame = view.frame
view.addSubview(sceneView)
sceneView.scene = scene
sceneView.delegate = self
sceneView.isPlaying = true
}
func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
flattenedNode?.removeFromParentNode()
flattenedNode = node.flattenedClone()
flattenedNode!.transform = node.transform
scene.rootNode.addChildNode(flattenedNode!)
}
}
Any help appreciated,
Thanks,
Darren.
