Examples: Added sigma in misc_exporter_usdz example

examples/misc_exporter_usdz.html

@@ -62,12 +62,11 @@
 				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.25, 20 );
 				camera.position.set( - 2.5, 0.6, 3.0 );
 
-				const environment = new RoomEnvironment();
 				const pmremGenerator = new THREE.PMREMGenerator( renderer );
 
 				scene = new THREE.Scene();
 				scene.background = new THREE.Color( 0xf0f0f0 );
-				scene.environment = pmremGenerator.fromScene( environment ).texture;
+				scene.environment = pmremGenerator.fromScene( new RoomEnvironment(), 0.04 ).texture;
 
 				const loader = new GLTFLoader().setPath( 'models/gltf/DamagedHelmet/glTF/' );
 				loader.load( 'DamagedHelmet.gltf', async function ( gltf ) {