getBackgroundNode( scene ) {

		this.updateBackground( scene );

		let backgroundNode = null;

		if ( scene.backgroundNode && scene.backgroundNode.isNode ) {

			backgroundNode = scene.backgroundNode;

		} else {

			const sceneData = this.get( scene );

			if ( sceneData.backgroundNode ) {

				backgroundNode = sceneData.backgroundNode;

			}

		}

		return backgroundNode;

	}
Returns a background node for the current configured
scene background.

@param {Scene} scene - The scene.
@return {Node} A node representing the current scene background.