How I can change material, like diffuse, on 3D model (.usdz or .obj)?

Hi all. I am new to swift and AR. I'm trying a project on AR and ran into a problem that I can't change the material on the models. With geometry such as a sphere or a cube, everything is simple. Tell me what am I doing wrong? My simple code:

 @IBOutlet var sceneView: ARSCNView!
    var modelNode: SCNNode!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        sceneView.delegate = self
        
        sceneView.showsStatistics = true
        
        let scene = SCNScene(named: "art.scnassets/jacket.usdz")!
        
        modelNode = scene.rootNode.childNode(withName: "jacket", recursively: true)
        let material = SCNMaterial()
        material.diffuse.contents = UIImage(named: "art.scnassets/58.png")

        
        modelNode.childNodes[0].geometry?.materials = [material]
        
        sceneView.scene = scene