USDZExporter: Export only visible objects. (#21846)

examples/js/exporters/USDZExporter.js

@@ -11,7 +11,7 @@
 			let output = buildHeader();
 			const materials = {};
 			const textures = {};
-			scene.traverse( object => {
+			scene.traverseVisible( object => {
 
 				if ( object.isMesh ) {
 

examples/jsm/exporters/USDZExporter.js

@@ -15,7 +15,7 @@ class USDZExporter {
 		const materials = {};
 		const textures = {};
 
-		scene.traverse( ( object ) => {
+		scene.traverseVisible( ( object ) => {
 
 			if ( object.isMesh ) {