Swift 3 load .dae file into SCNNode

Question

Loading a .dae file as a scene element

This code works, loading the file as the scene:

let scene = SCNScene(named: "art.scnassets/base-wall-tile_sample.dae")!

This code, loading the file as SCNGeometry, doesn't:

let url = Bundle.main.url(forResource: "art.scnassets/base-wall-tile_sample", withExtension: "dae")
let source = SCNSceneSource(url: url! )
let geo = source!.entryWithIdentifier("Geo", withClass: SCNGeometry.self)!

url and source are ok, but it crashes trying to produce geo. Bad instruction.

This code, like several examples offered on the web, was in Swift 2 (load a collada (dae) file into SCNNode (Swift - SceneKit). I had to juggle it to Swift 3, and something seems to have been lost in translation. Can someone tell me how to do this stuff right?

Answer 1

A .dae file is always loaded as a SCNScene. You need to name the node containing the geometry you want to add. Than you can load the scene, filter it for the node with the given name and add it to your scene.

func addNode(named nodeName, fromSceneNamed: sceneName, to scene: SCNScene) {
    if let loadedScene = SCNScene(named: sceneName),
       let node = loadedScene.rootNode.childNode(withName: nodeName, recursivly: true) {
        scene.rootNode.addChildNode(node)
    }
}