Background color doesn't change in SceneView about sceneform-android HOT 4 CLOSED

private fun loadBackground() {
        ViewRenderable.builder()
            .setView(context, R.layout.scene_background)
            .build()
            .thenAccept { view ->
                 addBackgroundToScene(view)
            }    
}

private fun addBackgroundToScene(view: ViewRenderable?) {
        val bgNode = Node().apply {
            localScale = Vector3(4f, 4f, 4f)
            name = "bg"
            renderable = view
            localPosition = Vector3(0f, -2f, 0f)
        }

        sceneView.scene.addChild(bgNode)
}