Change light defaults & fix light examples

crates/bevy_pbr/src/light.rs

@@ -217,6 +217,29 @@ impl Default for DirectionalLight {
 impl DirectionalLight {
     pub const DEFAULT_SHADOW_DEPTH_BIAS: f32 = 0.02;
     pub const DEFAULT_SHADOW_NORMAL_BIAS: f32 = 1.8;
+
+    /// The amount of light (lux) in a moonless, overcast night sky. (starlight)
+    pub const MOONLESS_NIGHT_LUX: f32 = 0.0001;
+    /// The amount of light (lux) in a full moon on a clear night.
+    pub const FULL_MOON_NIGHT_LUX: f32 = 0.05;
+    /// The amount of light (lux) in dark limit of civil twilight under a clear sky.
+    pub const CIVIL_TWILIGHT_LUX: f32 = 3.4;
+    /// The amount of light (lux) in a dark limit of civil twilight under a clear sky.
+    pub const LIVING_ROOM_LUX: f32 = 50.;
+    /// The amount of light (lux) in a office building hallway/toilet lighting.
+    pub const HALLWAY_LUX: f32 = 80.;
+    /// The amount of light (lux) in a family living room lights.
+    pub const DARK_OVERCAST_DAY_LUX: f32 = 100.;
+    /// The amount of light (lux) in a office.
+    pub const OFFICE_LUX: f32 = 320.;
+    /// The amount of light (lux) on Sunrise or sunset on a clear day.
+    pub const CLEAR_SUNRISE_LUX: f32 = 400.;
+    /// The amount of light (lux) on very dark overcast day.
+    pub const OVERCAST_DAY_LUX: f32 = 1000.;
+    /// The amount of light (lux) in full daylight. (not direct sun)
+    pub const FULL_DAYLIGHT: f32 = 10_000.;
+    /// The amount of light (lux) in Direct sunlight.
+    pub const DIRECT_SUNLIGHT: f32 = 50_000.;
 }
 
 /// Controls the resolution of [`DirectionalLight`] shadow maps.

examples/3d/lighting.rs

@@ -14,8 +14,8 @@ fn main() {
         .add_plugins(DefaultPlugins)
         .insert_resource(Parameters(PhysicalCameraParameters {
             aperture_f_stops: 1.0,
-            shutter_speed_s: 1.0 / 15.0,
-            sensitivity_iso: 400.0,
+            shutter_speed_s: 1.0 / 100.0,
+            sensitivity_iso: 100.0,
         }))
         .add_systems(Startup, setup)
         .add_systems(Update, (update_exposure, movement, animate_light_direction))
@@ -220,7 +220,7 @@ fn setup(
     // directional 'sun' light
     commands.spawn(DirectionalLightBundle {
         directional_light: DirectionalLight {
-            illuminance: 100.0,
+            illuminance: DirectionalLight::OVERCAST_DAY_LUX,
             shadows_enabled: true,
             ..default()
         },

examples/3d/pbr.rs

@@ -57,17 +57,6 @@ fn setup(
         ..default()
     });
 
-    // light
-    commands.spawn(PointLightBundle {
-        transform: Transform::from_xyz(50.0, 50.0, 50.0),
-        point_light: PointLight {
-            intensity: 100_000_000.,
-            range: 100.,
-            ..default()
-        },
-        ..default()
-    });
-
     // labels
     commands.spawn(
         TextBundle::from_section(
@@ -138,7 +127,7 @@ fn setup(
         EnvironmentMapLight {
             diffuse_map: asset_server.load("environment_maps/pisa_diffuse_rgb9e5_zstd.ktx2"),
             specular_map: asset_server.load("environment_maps/pisa_specular_rgb9e5_zstd.ktx2"),
-            intensity: 150.0,
+            intensity: 200.0,
         },
     ));
 }

examples/3d/vertex_colors.rs

@@ -42,17 +42,19 @@ fn setup(
         transform: Transform::from_xyz(0.0, 0.5, 0.0),
         ..default()
     });
-    // light
-    commands.spawn(PointLightBundle {
-        point_light: PointLight {
-            intensity: 500_000.0,
+
+    // Light
+    commands.spawn(DirectionalLightBundle {
+        directional_light: DirectionalLight {
+            illuminance: DirectionalLight::OVERCAST_DAY_LUX,
             shadows_enabled: true,
             ..default()
         },
-        transform: Transform::from_xyz(4.0, 8.0, 4.0),
+        transform: Transform::from_xyz(4.0, 5.0, 4.0).looking_at(Vec3::ZERO, Vec3::Y),
         ..default()
     });
-    // camera
+
+    // Camera
     commands.spawn(Camera3dBundle {
         transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
         ..default()

examples/3d/wireframe.rs

@@ -17,6 +17,7 @@ use bevy::{
         RenderPlugin,
     },
 };
+use bevy_internal::render::camera::ExposureSettings;
 
 fn main() {
     App::new()
@@ -94,19 +95,24 @@ fn setup(
 
     // light
     commands.spawn(PointLightBundle {
-        transform: Transform::from_xyz(4.0, 8.0, 4.0),
+        transform: Transform::from_xyz(0.0, 2.0, 0.0),
         point_light: PointLight {
-            intensity: 150_000.0,
+            intensity: 4000.0,
             ..default()
         },
         ..default()
     });
 
     // camera
-    commands.spawn(Camera3dBundle {
-        transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
-        ..default()
-    });
+    commands.spawn((
+        Camera3dBundle {
+            transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
+            ..default()
+        },
+        ExposureSettings {
+            ev100: ExposureSettings::EV100_INDOOR,
+        },
+    ));
 
     // Text used to show controls
     commands.spawn(