Merge pull request #1 from coreh/exposure_jms

Compensate for exposure after sampling background color, adjust transmission example

Author: GitGhillie

crates/bevy_pbr/src/render/pbr_transmission.wgsl

@@ -42,6 +42,9 @@ fn specular_transmissive_light(world_position: vec4<f32>, frag_coord: vec3<f32>,
         background_color = fetch_transmissive_background(offset_position, frag_coord, view_z, perceptual_roughness);
     }
 
+    // Compensate for exposure, since the background color is coming from an already exposure-adjusted texture
+    background_color = vec4(background_color.rgb / view_bindings::view.exposure, background_color.a);
+
     // Dot product of the refracted direction with the exit normal (Note: We assume the exit normal is the entry normal but inverted)
     let MinusNdotT = dot(-N, T);
 

examples/3d/transmission.rs

@@ -156,7 +156,7 @@ fn setup(
         PbrBundle {
             mesh: icosphere_mesh.clone(),
             material: materials.add(StandardMaterial {
-                emissive: Color::ANTIQUE_WHITE * 20.0 + Color::ORANGE_RED * 4.0,
+                emissive: Color::ANTIQUE_WHITE * 80.0 + Color::ORANGE_RED * 16.0,
                 diffuse_transmission: 1.0,
                 ..default()
             }),
@@ -328,7 +328,7 @@ fn setup(
             transform: Transform::from_xyz(-1.0, 1.7, 0.0),
             point_light: PointLight {
                 color: Color::ANTIQUE_WHITE * 0.8 + Color::ORANGE_RED * 0.2,
-                intensity: 1600.0,
+                intensity: 60_000.0,
                 radius: 0.2,
                 range: 5.0,
                 shadows_enabled: true,
@@ -348,7 +348,6 @@ fn setup(
             },
             transform: Transform::from_xyz(1.0, 1.8, 7.0).looking_at(Vec3::ZERO, Vec3::Y),
             color_grading: ColorGrading {
-                exposure: -2.0,
                 post_saturation: 1.2,
                 ..default()
             },
@@ -358,6 +357,7 @@ fn setup(
         #[cfg(not(all(feature = "webgl2", target_arch = "wasm32")))]
         TemporalAntiAliasBundle::default(),
         EnvironmentMapLight {
+            intensity: 25.0,
             diffuse_map: asset_server.load("environment_maps/pisa_diffuse_rgb9e5_zstd.ktx2"),
             specular_map: asset_server.load("environment_maps/pisa_specular_rgb9e5_zstd.ktx2"),
         },
@@ -651,7 +651,7 @@ fn flicker_system(
     let c = (s * 7.0).cos() * 0.0125 + (s * 2.0).cos() * 0.025;
     let (mut light, mut light_transform) = light.single_mut();
     let mut flame_transform = flame.single_mut();
-    light.intensity = 1600.0 + 3000.0 * (a + b + c);
+    light.intensity = 60_000.0 + 3000.0 * (a + b + c);
     flame_transform.translation = Vec3::new(-1.0, 1.23, 0.0);
     flame_transform.look_at(Vec3::new(-1.0 - c, 1.7 - b, 0.0 - a), Vec3::X);
     flame_transform.rotate(Quat::from_euler(EulerRot::XYZ, 0.0, 0.0, PI / 2.0));