从 .scn 文件加载后无法在 ARKit 场景中查看几何图形

Question

我有一个swatch.scn 文件，我正在尝试将它的几何图形添加到我的scene。我必须抓住swatch.childNodes.first 来获得正确的几何图形，然后添加它，但我的scene 中没有显示任何内容。很想知道如何解决这个问题。谢谢！

extension SCNNode {

    convenience init(named name: String) {
        self.init()
        guard let scene = SCNScene(named: name) else { return }

        for childNode in scene.rootNode.childNodes {
            addChildNode(childNode)
        }
    }

}


// in viewDidLoad

// Create a new scene
let scene = SCNScene(named: "art.scnassets/ship.scn")!

let swatch = SCNNode(named: "art.scnassets/swatch.scn")
let n = swatch.childNodes.first!
let geo = n.geometry!
print(n.geometry!) // <SCNGeometry: 0x281cb3b60 'bigger_swatch'>
n.position = SCNVector3(0, 0, -1)
n.scale = SCNVector3(3, 3, 3)
scene.rootNode.addChildNode(n)

Answer 1

试试这个

let swatch = SCNNode(named: "art.scnassets/swatch.scn")
swatch.position = SCNVector3(0, 0, -1)
swatch.scale = SCNVector3(3, 3, 3)
scene.rootNode.addChildNode(swatch)

// Note: your swatch-node holds the entire geometries from your file.
// You can do something like this:
print(swatch.childnodes.count)