example project fixes

example/lib/menus/asset_submenu.dart

@@ -173,7 +173,7 @@ class _AssetSubmenuState extends State<AssetSubmenu> {
                 ExampleWidgetState.buster = null;
               }
             },
-            child: Text(ExampleWidgetState.shapes == null
+            child: Text(ExampleWidgetState.buster == null
                 ? 'Load buster'
                 : 'Remove buster')),
         MenuItemButton(
@@ -189,7 +189,7 @@ class _AssetSubmenuState extends State<AssetSubmenu> {
                 ExampleWidgetState.flightHelmet = null;
               }
             },
-            child: Text(ExampleWidgetState.shapes == null
+            child: Text(ExampleWidgetState.flightHelmet == null
                 ? 'Load flight helmet'
                 : 'Remove flight helmet')),
         MenuItemButton(

example/lib/menus/camera_submenu.dart

@@ -88,12 +88,7 @@ class _CameraSubmenuState extends State<CameraSubmenu> {
                           height: 300,
                           width: 300,
                           color: Colors.white,
-                          child: Column(
-                              children: frustum
-                                  .map((vector) => Text(vector.storage
-                                      .map((v) => v.toStringAsFixed(2))
-                                      .join(",")))
-                                  .toList())));
+                          child: Text(frustum.toString())));
                 });
           },
           child: const Text("Get frustum")),