Add default UI camera

client/src/ui/mod.rs

@@ -11,4 +11,18 @@ pub fn plugin(app: &mut App) {
     app.insert_resource(UiPickingSettings {
         require_markers: true,
     });
+
+    app.add_systems(Startup, setup_ui_camera);
+}
+
+fn setup_ui_camera(mut commands: Commands) {
+    commands.spawn((
+        Camera2d,
+        Camera {
+            order: 1, // above 3D camera
+            ..default()
+        },
+        IsDefaultUiCamera,
+        UiPickingCamera,
+    ));
 }