有谁知道如何更改SceneView对象的背景颜色吗？我尝试将background属性放置到SceneView中，但它不会改变它，仍然使用默认背景。In this case I wanted to the background be green, but it's keeps gray/white

import SwiftUI
import SceneKit

struct ContentView: View {
    var body: some View {
    
        ZStack{
            Color.red
            SceneView(
                scene: SCNScene(named: "Earth.scn"),
                options: [.autoenablesDefaultLighting,.allowsCameraControl]
            )
            .frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height/2, alignment: .center)
            .background(Color.green)
            .border(Color.blue, width: 3)
        
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

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