add a sphere in space

src/world.rs

@@ -14,8 +14,11 @@ const CUBEMAP_PATH: &str = "textures/stars_cubemap.png";
 
 pub fn setup(
     mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
     asset_server: Res<AssetServer>,
 ) {
+    // Add skybox
     let skybox_handle = asset_server.load(CUBEMAP_PATH);
     commands.spawn((
         Camera3dBundle {
@@ -32,6 +35,25 @@ pub fn setup(
         is_loaded: false,
         image_handle: skybox_handle,
     });
+
+    // Add spheres
+    let sphere_radius = 0.25;
+    let sphere_handle = meshes.add(Sphere::new(sphere_radius));
+    let white_handle = materials.add(StandardMaterial {
+        base_color: Color::WHITE,
+        perceptual_roughness: 1.0,
+        ..default()
+    });
+    commands.spawn(PbrBundle {
+        mesh: sphere_handle.clone(),
+        material: white_handle.clone(),
+        transform: Transform::from_xyz(
+            0.0,
+            sphere_radius,
+            0.0,
+        ),
+        ..default()
+    });
 }
 
 pub fn load_cubemap_asset(