Image Based Lighting and HDRI Support #4581
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NHodgesVFX
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C-Enhancement
superdump
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A-Rendering
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Yup. https://google.github.io/filament/Filament.md.html#lighting/imagebasedlights is a good reference. Distant light probes is the part of interest for this issue I think. |
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Will ibl a part of bevy? |
Almost certainly, yes. |
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Great👍 |
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https://bruop.github.io/ibl/ is a great blog post on IBL. It's what's referenced in the Khronos glTF Sample Viewer code. |
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Any news on this? |
myreprise1
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Feb 11, 2023
(Before)  (After)   # Objective - Improve lighting; especially reflections. - Closes bevyengine#4581. ## Solution - Implement environment maps, providing better ambient light. - Add microfacet multibounce approximation for specular highlights from Filament. - Occlusion is no longer incorrectly applied to direct lighting. It now only applies to diffuse indirect light. Unsure if it's also supposed to apply to specular indirect light - the glTF specification just says "indirect light". In the case of ambient occlusion, for instance, that's usually only calculated as diffuse though. For now, I'm choosing to apply this just to indirect diffuse light, and not specular. - Modified the PBR example to use an environment map, and have labels. - Added `FallbackImageCubemap`. ## Implementation - IBL technique references can be found in environment_map.wgsl. - It's more accurate to use a LUT for the scale/bias. Filament has a good reference on generating this LUT. For now, I just used an analytic approximation. - For now, environment maps must first be prefiltered outside of bevy using a 3rd party tool. See the `EnvironmentMap` documentation. - Eventually, we should have our own prefiltering code, so that we can have dynamically changing environment maps, as well as let users drop in an HDR image and use asset preprocessing to create the needed textures using only bevy. --- ## Changelog - Added an `EnvironmentMapLight` camera component that adds additional ambient light to a scene. - StandardMaterials will now appear brighter and more saturated at high roughness, due to internal material changes. This is more physically correct. - Fixed StandardMaterial occlusion being incorrectly applied to direct lighting. - Added `FallbackImageCubemap`. Co-authored-by: IceSentry <c.giguere42@gmail.com> Co-authored-by: James Liu <contact@jamessliu.com> Co-authored-by: Rob Parrett <robparrett@gmail.com>
myreprise1
pushed a commit
to myreprise1/bevy
that referenced
this issue
Feb 11, 2023
(Before)  (After)   # Objective - Improve lighting; especially reflections. - Closes bevyengine#4581. ## Solution - Implement environment maps, providing better ambient light. - Add microfacet multibounce approximation for specular highlights from Filament. - Occlusion is no longer incorrectly applied to direct lighting. It now only applies to diffuse indirect light. Unsure if it's also supposed to apply to specular indirect light - the glTF specification just says "indirect light". In the case of ambient occlusion, for instance, that's usually only calculated as diffuse though. For now, I'm choosing to apply this just to indirect diffuse light, and not specular. - Modified the PBR example to use an environment map, and have labels. - Added `FallbackImageCubemap`. ## Implementation - IBL technique references can be found in environment_map.wgsl. - It's more accurate to use a LUT for the scale/bias. Filament has a good reference on generating this LUT. For now, I just used an analytic approximation. - For now, environment maps must first be prefiltered outside of bevy using a 3rd party tool. See the `EnvironmentMap` documentation. - Eventually, we should have our own prefiltering code, so that we can have dynamically changing environment maps, as well as let users drop in an HDR image and use asset preprocessing to create the needed textures using only bevy. --- ## Changelog - Added an `EnvironmentMapLight` camera component that adds additional ambient light to a scene. - StandardMaterials will now appear brighter and more saturated at high roughness, due to internal material changes. This is more physically correct. - Fixed StandardMaterial occlusion being incorrectly applied to direct lighting. - Added `FallbackImageCubemap`. Co-authored-by: IceSentry <c.giguere42@gmail.com> Co-authored-by: James Liu <contact@jamessliu.com> Co-authored-by: Rob Parrett <robparrett@gmail.com>
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YES!! This has been the one thing thats stopped me from wanting to explorer bevy further, can't wait to try it out. good work everyone |
myreprise1
pushed a commit
to myreprise1/bevy
that referenced
this issue
Feb 15, 2023
(Before)  (After)   # Objective - Improve lighting; especially reflections. - Closes bevyengine#4581. ## Solution - Implement environment maps, providing better ambient light. - Add microfacet multibounce approximation for specular highlights from Filament. - Occlusion is no longer incorrectly applied to direct lighting. It now only applies to diffuse indirect light. Unsure if it's also supposed to apply to specular indirect light - the glTF specification just says "indirect light". In the case of ambient occlusion, for instance, that's usually only calculated as diffuse though. For now, I'm choosing to apply this just to indirect diffuse light, and not specular. - Modified the PBR example to use an environment map, and have labels. - Added `FallbackImageCubemap`. ## Implementation - IBL technique references can be found in environment_map.wgsl. - It's more accurate to use a LUT for the scale/bias. Filament has a good reference on generating this LUT. For now, I just used an analytic approximation. - For now, environment maps must first be prefiltered outside of bevy using a 3rd party tool. See the `EnvironmentMap` documentation. - Eventually, we should have our own prefiltering code, so that we can have dynamically changing environment maps, as well as let users drop in an HDR image and use asset preprocessing to create the needed textures using only bevy. --- ## Changelog - Added an `EnvironmentMapLight` camera component that adds additional ambient light to a scene. - StandardMaterials will now appear brighter and more saturated at high roughness, due to internal material changes. This is more physically correct. - Fixed StandardMaterial occlusion being incorrectly applied to direct lighting. - Added `FallbackImageCubemap`. Co-authored-by: IceSentry <c.giguere42@gmail.com> Co-authored-by: James Liu <contact@jamessliu.com> Co-authored-by: Rob Parrett <robparrett@gmail.com>
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What problem does this solve or what need does it fill?
Currently, the only way to add a sky would be to add a sphere with a texture applied or add use a plugin of some kind. However at least from what I have found no plugins support proper based image based lighting with HDRI support. This feature should be in bevy and not a plugin because PBR, which is already supported by Bevy, goes hand in hand with IBL. Without IBL PBR still looks fake, IBL dramatically increases the realism of the scene.
What solution would you like?
Proper PBR style IBL with support for a "Sky Light" where you can add 360 degree 32bit .hdr or .exr textures or be dynamically set with a shader. The implementation should be able to work in real-time so its possible to update the texture either from disk or from a shader to simulate things like a day / night cycle or clouds. The HDRI should also be rendered as the background of the scene.
Godot has a implementation that is fast and looks good, I have also included links to the LearnOpenGl article on the subject although i'm not sure that implementation works in real-time.
godotengine/godot#36588
https://www.ppsloan.org/publications/ggx_filtering.pdf
https://learnopengl.com/PBR/IBL/Diffuse-irradiance
https://learnopengl.com/PBR/IBL/Specular-IBL
What alternative(s) have you considered?
Using a sphere with a texture applied but this has the issue that the light will not be cast onto objects and will not be shown in reflections.
Additional context
Bevy's PBR without IBL
PBR with IBL From LearnOpenGL
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