( function () {

	/**
 * https://github.com/google/model-viewer/blob/master/packages/model-viewer/src/three-components/EnvironmentScene.ts
 */

	class RoomEnvironment extends THREE.Scene {

		constructor() {

			super();
			const geometry = new THREE.BoxGeometry();
			geometry.deleteAttribute( 'uv' );
			const roomMaterial = new THREE.MeshStandardMaterial( {
				side: THREE.BackSide
			} );
			const boxMaterial = new THREE.MeshStandardMaterial();
			const mainLight = new THREE.PointLight( 0xffffff, 5.0, 28, 2 );
			mainLight.position.set( 0.418, 16.199, 0.300 );
			this.add( mainLight );
			const room = new THREE.Mesh( geometry, roomMaterial );
			room.position.set( - 0.757, 13.219, 0.717 );
			room.scale.set( 31.713, 28.305, 28.591 );
			this.add( room );
			const box1 = new THREE.Mesh( geometry, boxMaterial );
			box1.position.set( - 10.906, 2.009, 1.846 );
			box1.rotation.set( 0, - 0.195, 0 );
			box1.scale.set( 2.328, 7.905, 4.651 );
			this.add( box1 );
			const box2 = new THREE.Mesh( geometry, boxMaterial );
			box2.position.set( - 5.607, - 0.754, - 0.758 );
			box2.rotation.set( 0, 0.994, 0 );
			box2.scale.set( 1.970, 1.534, 3.955 );
			this.add( box2 );
			const box3 = new THREE.Mesh( geometry, boxMaterial );
			box3.position.set( 6.167, 0.857, 7.803 );
			box3.rotation.set( 0, 0.561, 0 );
			box3.scale.set( 3.927, 6.285, 3.687 );
			this.add( box3 );
			const box4 = new THREE.Mesh( geometry, boxMaterial );
			box4.position.set( - 2.017, 0.018, 6.124 );
			box4.rotation.set( 0, 0.333, 0 );
			box4.scale.set( 2.002, 4.566, 2.064 );
			this.add( box4 );
			const box5 = new THREE.Mesh( geometry, boxMaterial );
			box5.position.set( 2.291, - 0.756, - 2.621 );
			box5.rotation.set( 0, - 0.286, 0 );
			box5.scale.set( 1.546, 1.552, 1.496 );
			this.add( box5 );
			const box6 = new THREE.Mesh( geometry, boxMaterial );
			box6.position.set( - 2.193, - 0.369, - 5.547 );
			box6.rotation.set( 0, 0.516, 0 );
			box6.scale.set( 3.875, 3.487, 2.986 );
			this.add( box6 ); // -x right

			const light1 = new THREE.Mesh( geometry, createAreaLightMaterial( 50 ) );
			light1.position.set( - 16.116, 14.37, 8.208 );
			light1.scale.set( 0.1, 2.428, 2.739 );
			this.add( light1 ); // -x left

			const light2 = new THREE.Mesh( geometry, createAreaLightMaterial( 50 ) );
			light2.position.set( - 16.109, 18.021, - 8.207 );
			light2.scale.set( 0.1, 2.425, 2.751 );
			this.add( light2 ); // +x

			const light3 = new THREE.Mesh( geometry, createAreaLightMaterial( 17 ) );
			light3.position.set( 14.904, 12.198, - 1.832 );
			light3.scale.set( 0.15, 4.265, 6.331 );
			this.add( light3 ); // +z

			const light4 = new THREE.Mesh( geometry, createAreaLightMaterial( 43 ) );
			light4.position.set( - 0.462, 8.89, 14.520 );
			light4.scale.set( 4.38, 5.441, 0.088 );
			this.add( light4 ); // -z

			const light5 = new THREE.Mesh( geometry, createAreaLightMaterial( 20 ) );
			light5.position.set( 3.235, 11.486, - 12.541 );
			light5.scale.set( 2.5, 2.0, 0.1 );
			this.add( light5 ); // +y

			const light6 = new THREE.Mesh( geometry, createAreaLightMaterial( 100 ) );
			light6.position.set( 0.0, 20.0, 0.0 );
			light6.scale.set( 1.0, 0.1, 1.0 );
			this.add( light6 );

		}

		dispose() {

			const resources = new Set();
			this.traverse( object => {

				if ( object.isMesh ) {

					resources.add( object.geometry );
					resources.add( object.material );

				}

			} );

			for ( const resource of resources ) {

				resource.dispose();

			}

		}

	}

	function createAreaLightMaterial( intensity ) {

		const material = new THREE.MeshBasicMaterial();
		material.color.setScalar( intensity );
		return material;

	}

	THREE.RoomEnvironment = RoomEnvironment;

} )();