add directional light, disable ambient light

src/world.rs

@@ -3,6 +3,8 @@ use bevy::prelude::*;
 use bevy::core_pipeline::Skybox;
 use bevy::asset::LoadState;
 use bevy::render::render_resource::{TextureViewDescriptor, TextureViewDimension};
+use bevy::pbr::CascadeShadowConfigBuilder;
+use std::f32::consts::PI;
 
 #[derive(Resource)]
 pub struct Cubemap {
@@ -16,6 +18,7 @@ pub fn setup(
     mut commands: Commands,
     mut meshes: ResMut<Assets<Mesh>>,
     mut materials: ResMut<Assets<StandardMaterial>>,
+    mut ambient_light: ResMut<AmbientLight>,
     asset_server: Res<AssetServer>,
 ) {
     // Add skybox
@@ -37,10 +40,10 @@ pub fn setup(
     });
 
     // Add spheres
-    let sphere_radius = 0.25;
+    let sphere_radius = 1.0;
     let sphere_handle = meshes.add(Sphere::new(sphere_radius));
     let white_handle = materials.add(StandardMaterial {
-        base_color: Color::WHITE,
+        base_color: Color::GRAY,
         perceptual_roughness: 1.0,
         ..default()
     });
@@ -54,6 +57,43 @@ pub fn setup(
         ),
         ..default()
     });
+
+    // Space is DARK
+    ambient_light.brightness = 0.0;
+
+    // Add Light
+    commands.spawn(PointLightBundle {
+        transform: Transform::from_xyz(5.0, 5.0, 0.0),
+        point_light: PointLight {
+            intensity: 0.0,
+            range: 500.0,
+            color: Color::WHITE,
+            shadows_enabled: true,
+            ..default()
+        },
+        ..default()
+    });
+
+    commands.spawn(DirectionalLightBundle {
+        directional_light: DirectionalLight {
+            illuminance: light_consts::lux::OVERCAST_DAY,
+            shadows_enabled: true,
+            ..default()
+        },
+        transform: Transform::from_rotation(Quat::from_euler(
+            EulerRot::ZYX,
+            0.0,
+            PI / 2.,
+            -PI / 4.,
+        )),
+        cascade_shadow_config: CascadeShadowConfigBuilder {
+            first_cascade_far_bound: 7.0,
+            maximum_distance: 25.0,
+            ..default()
+        }
+        .into(),
+        ..default()
+    });
 }
 
 pub fn load_cubemap_asset(