three.js/src/scenes/Scene.js

import { Object3D } from '../core/Object3D';

/**
 * @author mrdoob / http://mrdoob.com/
 */

function Scene () {

	Object3D.call( this );

	this.type = 'Scene';

	this.background = null;
	this.fog = null;
	this.overrideMaterial = null;

	this.autoUpdate = true; // checked by the renderer

}

Scene.prototype = Object.create( Object3D.prototype );

Scene.prototype.constructor = Scene;

Scene.prototype.copy = function ( source, recursive ) {

	Object3D.prototype.copy.call( this, source, recursive );

	if ( source.background !== null ) this.background = source.background.clone();
	if ( source.fog !== null ) this.fog = source.fog.clone();
	if ( source.overrideMaterial !== null ) this.overrideMaterial = source.overrideMaterial.clone();

	this.autoUpdate = source.autoUpdate;
	this.matrixAutoUpdate = source.matrixAutoUpdate;

	return this;

};

Scene.prototype.toJSON = function ( meta ) {

	var data = Object3D.prototype.toJSON.call( this, meta );

	if ( this.background !== null ) data.object.background = this.background.toJSON( meta );
	if ( this.fog !== null ) data.object.fog = this.fog.toJSON();

	return data;

};

export { Scene };