SCNKit ERROR removing the root node of a scene from its scene is not allowed

ios, scenekit, swift

Solution

Root nodes are special -- they can't be un-parented from their scenes and moved into new scenes. You need to pull a child or descendant node out of your `levelScene` to move into your game scene. e.g.:

let heroScene = SCNScene(named: "hero.dae")
if let heroNode = heroScene.rootNode.childNodeWithName("heroGroup", recursively: true) {
    scene.rootNode.addChildNode(heroNode)
}

or move them all:

for node in levelScene.rootNode.childNodes as [SCNNode] {
    scene.rootNode.addChildNode(node)
}

Problem

I have the following code (SceneKit in Swift targeting iOS): ``` let scnView = self.view as SCNView let scene = SCNScene() let levelScene = SCNScene(named: "level") scene.rootNode.addChildNode(levelScene.rootNode) scnView.scene = scene scnView.backgroundColor = UIColor.grayColor() scnView.allowsCameraControl = true scnView.showsStatistics = true ``` The problem is, at `scene.rootNode.addChildNode(level.rootNode)` I get the following error in the console: `[SCNKit ERROR] removing the root node of a scene from its scene is not allowed` I am not sure why this error is coming up, but I am trying to load my `level.dae` file in and add it to the scene. From what I can see in the simulator (and device), it loads fine. What should I do to prevent the error message from occuring?

Original source