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Johannes Hackel 1fcf6a444f
Add emissive_exposure_weight to the StandardMaterial (#13350) 
# Objective

- The emissive color gets multiplied by the camera exposure value. But
this cancels out almost any emissive effect.
- Fixes #13133
- Closes PR #13337 

## Solution
- Add emissive_exposure_weight to the StandardMaterial
- In the shader this value is stored in the alpha channel of the
emissive color.
- This value defines how much the exposure influences the emissive
color.
- It's equal to Google's Filament:
https://google.github.io/filament/Materials.html#emissive

4f021583f1/shaders/src/shading_lit.fs (L287)

## Testing

- The result of
[EmissiveStrengthTest](https://github.com/KhronosGroup/glTF-Sample-Models/tree/main/2.0/EmissiveStrengthTest)
with the default value of 0.0:

without bloom:

![emissive_fix](https://github.com/bevyengine/bevy/assets/688816/8f8c131a-464a-4d7b-a9e4-4e28d679ee5d)

with bloom:

![emissive_fix_bloom](https://github.com/bevyengine/bevy/assets/688816/89f200ee-3bd5-4daa-bf64-8999b56df3fa)
2024-05-17 13:49:53 +00:00
..
3d_scene.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
3d_shapes.rs Add meshing for Cone (#11820) 2024-05-13 18:00:59 +00:00
3d_viewport_to_world.rs Use Dir3 for local axis methods in GlobalTransform (#13264) 2024-05-06 20:52:05 +00:00
animated_material.rs Add hue traits (#12399) 2024-03-22 00:36:46 +00:00
anti_aliasing.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
atmospheric_fog.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
auto_exposure.rs Implement Auto Exposure plugin (#12792) 2024-05-03 17:45:17 +00:00
blend_modes.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
bloom_3d.rs Add emissive_exposure_weight to the StandardMaterial (#13350) 2024-05-17 13:49:53 +00:00
clearcoat.rs Implement clearcoat per the Filament and the KHR_materials_clearcoat specifications. (#13031) 2024-05-05 22:57:05 +00:00
color_grading.rs Fix CI error on new color grading example (#13180) 2024-05-02 13:40:45 +00:00
deferred_rendering.rs Use load_with_settings instead of manually overriding srgbness in examples (#13399) 2024-05-16 23:26:22 +00:00
depth_of_field.rs Implement fast depth of field as a postprocessing effect. (#13009) 2024-05-13 18:23:56 +00:00
fog.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
generate_custom_mesh.rs Clarify comment about camera coordinate system (#13056) 2024-04-23 14:58:28 +00:00
irradiance_volumes.rs separating finite and infinite 3d planes (#12426) 2024-04-18 14:13:22 +00:00
lighting.rs Implement fast depth of field as a postprocessing effect. (#13009) 2024-05-13 18:23:56 +00:00
lightmaps.rs Add emissive_exposure_weight to the StandardMaterial (#13350) 2024-05-17 13:49:53 +00:00
lines.rs Intern mesh vertex buffer layouts so that we don't have to compare them over and over. (#12216) 2024-03-01 20:56:21 +00:00
load_gltf.rs New Exposure and Lighting Defaults (and calibrate examples) (#11868) 2024-02-15 20:42:48 +00:00
meshlet.rs Example setup for tooling (#13088) 2024-05-02 20:10:09 +00:00
motion_blur.rs Fix motion blur on wasm (#13099) 2024-05-12 21:03:36 +00:00
orthographic.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
parallax_mapping.rs Use load_with_settings instead of manually overriding srgbness in examples (#13399) 2024-05-16 23:26:22 +00:00
parenting.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
pbr.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
reflection_probes.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
render_to_texture.rs example render_to_texture: remove extra light (#13398) 2024-05-16 23:26:55 +00:00
shadow_biases.rs Implement percentage-closer filtering (PCF) for point lights. (#12910) 2024-04-10 20:16:08 +00:00
shadow_caster_receiver.rs Remove redundant imports (#12817) 2024-04-01 19:59:08 +00:00
skybox.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
spherical_area_lights.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
split_screen.rs Fix "dark grey" colors becoming lighter in various examples (#12333) 2024-03-06 05:19:59 +00:00
spotlight.rs Add emissive_exposure_weight to the StandardMaterial (#13350) 2024-05-17 13:49:53 +00:00
ssao.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
texture.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
tonemapping.rs Implement filmic color grading. (#13121) 2024-05-02 12:18:59 +00:00
transmission.rs Add emissive_exposure_weight to the StandardMaterial (#13350) 2024-05-17 13:49:53 +00:00
transparency_3d.rs Implement alpha to coverage (A2C) support. (#12970) 2024-04-15 20:37:52 +00:00
two_passes.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
update_gltf_scene.rs New Exposure and Lighting Defaults (and calibrate examples) (#11868) 2024-02-15 20:42:48 +00:00
vertex_colors.rs Migrate from LegacyColor to bevy_color::Color (#12163) 2024-02-29 19:35:12 +00:00
visibility_range.rs Implement visibility ranges, also known as hierarchical levels of detail (HLODs). (#12916) 2024-05-03 00:11:35 +00:00
volumetric_fog.rs Implement volumetric fog and volumetric lighting, also known as light shafts or god rays. (#13057) 2024-05-16 17:13:18 +00:00
wireframe.rs Use WireframeColor to override global color (#13034) 2024-04-20 13:59:12 +00:00