( function () {

	class DebugEnvironment extends THREE.Scene {

		constructor() {

			super();
			const geometry = new THREE.BoxGeometry();
			geometry.deleteAttribute( 'uv' );
			const roomMaterial = new THREE.MeshStandardMaterial( {
				metalness: 0,
				side: THREE.BackSide
			} );
			const room = new THREE.Mesh( geometry, roomMaterial );
			room.scale.setScalar( 10 );
			this.add( room );
			const mainLight = new THREE.PointLight( 0xffffff, 50, 0, 2 );
			this.add( mainLight );
			const material1 = new THREE.MeshLambertMaterial( {
				color: 0xff0000,
				emissive: 0xffffff,
				emissiveIntensity: 10
			} );
			const light1 = new THREE.Mesh( geometry, material1 );
			light1.position.set( - 5, 2, 0 );
			light1.scale.set( 0.1, 1, 1 );
			this.add( light1 );
			const material2 = new THREE.MeshLambertMaterial( {
				color: 0x00ff00,
				emissive: 0xffffff,
				emissiveIntensity: 10
			} );
			const light2 = new THREE.Mesh( geometry, material2 );
			light2.position.set( 0, 5, 0 );
			light2.scale.set( 1, 0.1, 1 );
			this.add( light2 );
			const material3 = new THREE.MeshLambertMaterial( {
				color: 0x0000ff,
				emissive: 0xffffff,
				emissiveIntensity: 10
			} );
			const light3 = new THREE.Mesh( geometry, material3 );
			light3.position.set( 2, 1, 5 );
			light3.scale.set( 1.5, 2, 0.1 );
			this.add( light3 );

		}

	}

	THREE.DebugEnvironment = DebugEnvironment;

} )();