looking for sample code 3d wireframe (with lines ) & polygons

Looking for sample code 3d wireframe (with lines ) & polygons and should be able to rotate (set camera angles)

I tried sample code seems to be complicated & getting a BLANK screen

import SwiftUI
import SceneKit
struct SceneKitTest2: View {
    var body: some View {
        VStack{
            Text("SceneKitTest2")
            SceneView(scene: SCNScene(named:"Earth_1_12756.scn"), options: [.autoenablesDefaultLighting,.allowsCameraControl])
                .frame(width:UIScreen.main.bounds.width,
                       height: UIScreen.main.bounds.height/2)
            Spacer(minLength: 0)
        }
    }
}