EEVEE-Next #93220

This is a list of all the tasks planned for the complete rewrite of EEVEE's codebase.
Due to a change in requirements, this rewrite is planned for after the metal backend has landed in master.

Main features are:

Virtual Shadowmapping: Increases shadow resolution and maximum sharpness while keeping relatively low memory footprint.
Subsurface Scattering: New algorithm that eliminate light leaking between objects and supports per pixel radius.
High Light count support: Lights are now efficiently culled and there is virtually no limits to the maximum number of lights in a scene.
Panoramic Camera: By rendering up to 6 views we can cover any panoramic projection by reprojecting the sample.
Motion Blur: Now supports shutter curve.
Grease Pencil Object support: Grease pencil object are now treated as any other geometry and fully compatible with the shading pipeline.
Shading: Arbitrary number of BSDFs are now supported without major performance impact. Raytracing and SSS is no more restricted to one BSDF node.
Thickness output: This is a new output which control the thickness for translucency, refraction and volume shader.
Renderpass: All passes are rendered at once and do not need multiple geometry passes (except cryptomatte).

NOTE: Many of the features listed below have been implemented in the eevee-rewrite branch and are still being ported to master.
NOTE: Not all the feature listed here are required for the first release.

Film

Finish TAA reprojection. Motion vectors are now already possible in the viewport.
Sample accumulation. (issues with filter size < 1)
Reduce memory usage of weight buffers.

Camera

Port Depth Of Field.
Better DoF for panoramic.
Panoramic camera support could be improved to have better quality.
Panoramic camera. (still has issues with border blending of the different views)

Motion Blur

Motion steps data.
- Mesh.
- Curves (Hairs).
Shutter curve support for time steps.

Shading

Memory usage reduction based on BSDFs used.
Bump Mapping support
AO texture node support
Shader to RGB support. (Need to have multiple BSDF tree evaluation)
Vertex Displacement Mapping support
D9792: [WIP] Eevee: Parallax Occlusion Mapping from Displacement Output
Single pass HiZ using compute shader

Subsurface Scattering

New algorithm

Volumetric

Port World space volume.
Object space volume (high quality)
Object depth
Volume shadows (in shadowmaps) (may not work with virtual shadow maps tracing)

Raytracing

Screen Space Tracing port.
Glossy ray.
Diffuse ray.
Refraction ray.
Finish denoising & reprojection.
Reintroduce Half-res tracing.
Multibounce support.
Better fallback. (use filtered probes when possible)
Planar reflections or a fallback to them (or remove).

Light

Efficient Light culling
Rewrite light backend to support arbitrary light count
#68478 World Light Extraction

Shadows

#104472 Virtual Shadow mapping
Shadow tracing

Render Passes

#99390 (Eevee-next: Cryptomatte render pass)
Other Render passes

Grease Pencil:

Geometry support (missing dot support)
Default material support
Grease Pencil info node (still needs design)

This is a list of all the tasks planned for the complete rewrite of EEVEE's codebase. Due to a change in requirements, this rewrite is planned for after the metal backend has landed in master. Main features are: - **Virtual Shadowmapping**: Increases shadow resolution and maximum sharpness while keeping relatively low memory footprint. - **Subsurface Scattering**: New algorithm that eliminate light leaking between objects and supports per pixel radius. - **High Light count support**: Lights are now efficiently culled and there is virtually no limits to the maximum number of lights in a scene. - **Panoramic Camera**: By rendering up to 6 views we can cover any panoramic projection by reprojecting the sample. - **Motion Blur**: Now supports shutter curve. - **Grease Pencil Object support**: Grease pencil object are now treated as any other geometry and fully compatible with the shading pipeline. - **Shading**: Arbitrary number of BSDFs are now supported without major performance impact. Raytracing and SSS is no more restricted to one BSDF node. - **Thickness output**: This is a new output which control the thickness for translucency, refraction and volume shader. - **Renderpass**: All passes are rendered at once and do not need multiple geometry passes (except cryptomatte). NOTE: Many of the features listed below have been implemented in the `eevee-rewrite` branch and are still being ported to master. NOTE: Not all the feature listed here are required for the first release. ### Film - [x] Finish TAA reprojection. Motion vectors are now already possible in the viewport. - [x] Sample accumulation. (issues with filter size < 1) - [x] Reduce memory usage of weight buffers. ### Camera - [x] Port Depth Of Field. - [ ] Better DoF for panoramic. - [ ] Panoramic camera support could be improved to have better quality. - [ ] Panoramic camera. (still has issues with border blending of the different views) ### Motion Blur - [ ] Motion steps data. - [x] Mesh. - [ ] Curves (Hairs). - [x] Shutter curve support for time steps. ### Shading - [x] Memory usage reduction based on BSDFs used. - [x] Bump Mapping support - [ ] AO texture node support - [x] Shader to RGB support. (Need to have multiple BSDF tree evaluation) - [x] Vertex Displacement Mapping support - [ ] [D9792: [WIP] Eevee: Parallax Occlusion Mapping from Displacement Output](https://archive.blender.org/developer/D9792) - [x] Single pass HiZ using compute shader ### Subsurface Scattering - [x] New algorithm ### Volumetric - [ ] Port World space volume. - [ ] Object space volume (high quality) - [ ] Object depth - [ ] Volume shadows (in shadowmaps) (may not work with virtual shadow maps tracing) ### Raytracing - [ ] Screen Space Tracing port. - [ ] Glossy ray. - [ ] Diffuse ray. - [ ] Refraction ray. - [ ] Finish denoising & reprojection. - [ ] Reintroduce Half-res tracing. - [ ] Multibounce support. - [ ] Better fallback. (use filtered probes when possible) - [ ] Planar reflections or a fallback to them (or remove). ### Light - [x] Efficient Light culling - [x] Rewrite light backend to support arbitrary light count - [ ] #68478 World Light Extraction ### Shadows - [x] #104472 Virtual Shadow mapping - [ ] Shadow tracing ### Render Passes - [x] #99390 (Eevee-next: Cryptomatte render pass) - [x] Other Render passes ### Grease Pencil: - [ ] Geometry support (missing dot support) - [ ] Default material support - [ ] Grease Pencil info node (still needs design)

Changed status from 'Needs Triage' to: 'Confirmed'

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Is this: https://developer.blender.org/T68478 really missing from the list or is it part of some other feature in the list?

I am asking because lack of almost any feature in this list is nowhere near as big of a pain point as the fact currently, when using any HDRI lighting, users have to keep two separate lighting setups for Eevee and Cycles, and also spend substantial amount of time creating Eevee HDRI light ligth based on rough calibration by the Cycles reference. Then, every time when switching between Eevee and Cycles, the user has to either swap the light rigs, or use the less physically based (with scene lights in place of HDRI hotspots) Eevee light right also with Cycles.

Furthermore, majority of users do not even posses the skill and knowledge to pull off an Eevee HDRI light rig that's at least remotely closer to correct HDRI illumination. Aside from getting the light intensities, colors and radii right, one also has to do numerous hacks with ray switching in world shader to ensure that directly visible environment is unclamped for tone mapping and bloom to work correctly, while at the same time making sure that diffuse contribution of the world shader is clamped so that the light is not doubled.

Solving this issue would significantly improve both Eevee workflow as well as image quality produced by users to average skill level, since diffuse illumination from HDRIs would not longer be extremely incorrect.

Unless the Ray Tracing section of this list includes diffuse illumination from the world shader with HDRI texture support, then even if every single feature on this list would be completed, most users would still produce images of significantly degraded quality unless they posses the quite advanced knowledge to work around it described above.

@Rawalanche I will add it to the list of features that may be tackled after the rewrite. I would not consider it a blocker since it is a new feature and is not fundamentally a missing part of the pipeline.

The Raytracing changes does improve this use case but still introduce too much noise. So I think sun light extraction is still a needed feature.

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Moderation note This is not the proper place for user feedback or feature requests. Please check this for appropriate places: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

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Again, please don't use this task for feature requests or user questions! There are other channels for this: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

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Please keep this task on topic! This task is for developers and should focus on code design and review. Please refrain from further user questions, including asking for a build, asking for a merge ETA, examples, comparison with other software and so on... It is also too early for bug reports. Thank you for your understanding.

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Like any other online platform, there are rules here as well. I explained this several times before. One again:
Please keep this task on topic! This task is for developers and should focus on code design and review. Please refrain from further user questions, including asking for a build, asking for a merge ETA, examples, comparison with other software and so on... It is also too early for bug reports. Thank you for your understanding.

Or in more simple words: If you are not a developer, working on the EEVEE rewrite, this is NOT the right place for comments.

Please help to keep this platform clean for developers and use places like blenderartists for user discussions. Thanks.

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An update is long overdue.

This task has accumulated many delay due to multiple things.

The major reason is that during the middle of the rewrite, I was facing major technical difficulty caused by limitations from our GL 3.3 requirement. So at some point I took the decision to make use of more modern techniques and drop support from older hardware. We are aiming to require GL 4.3 capable hardware in the near future. However this means that we cannot rely on the GL implementation on Apple computers. So I had to sidetrack to another project to make sure that shaders will be compatible with Vulkan and Metal (D13360).

Comming back to the rewrite I had to redo many things a second time to use the more modern way to do things. This was needed for performance reasons.

But with all the added delay and without much real testing possible (because of feature incompleteness and plethora of TODOs) it was starting to feel like a never ending project. So we decided to start pushing the developpement into master in an attempt to guide the developpement using feedback from the Blender Studio. The new implementation is hidden under a new experimental option (59f53f5802). My goal with this is to merge the eevee-rewrite branch into master bit by bit making sure each feature is polished. The GPU module changes needed are already in master.

I'll resume my weekly reports on my [wiki section ]] for the week to week updates. For important milestones and feedback, I created [ https:*devtalk.blender.org/t/eevee-next/23570 | this topic on devtalk .

I would like to thank everyone who showed interest in this task.

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In #93220#1327240, @fclem wrote:
The major reason is that during the middle of the rewrite, I was facing major technical difficulty caused by limitations from our GL 3.3 requirement. So at some point I took the decision to make use of more modern techniques and drop support from older hardware. We are aiming to require GL 4.3 capable hardware in the near future. However this means that we cannot rely on the GL implementation on Apple computers. So I had to sidetrack to another project to make sure that shaders will be compatible with Vulkan and Metal (D13360).

Possibly a dumb question, but if Apple support means having to sidetrack to support Vulkan and Metal, why not just use Vulkan as the base for all platforms instead of GL 4.3? Or did I misunderstand something?

@Rawalanche having shader syntax compatible with vulkan is an important step into this direction. Having a production ready fully working vulkan backend takes (a lot) more time. Bumping the version to OpenGL 4.3 would make it easier to transition to vulkan.

In #93220#1327526, @Jeroen-Bakker wrote:
@Rawalanche having shader syntax compatible with vulkan is an important step into this direction. Having a production ready fully working vulkan backend takes (a lot) more time. Bumping the version to OpenGL 4.3 would make it easier to transition to vulkan.

I see. I did not know upgrading GL version is/could be just intermediate step on the road to Vulkan backend. That's why I asked :)

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Thank you so much Clement, this was all I wanted! I wish you the best of luck with the project, I know nothing about program development but an eevee rewrite sounds like a lot of work. Also sorry Thomas for all the trouble, just wanted to thank Clement :D

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EEVEE-Next #93220

Film

Camera

Motion Blur

Shading

Subsurface Scattering

Volumetric

Raytracing

Light

Shadows

Render Passes

Grease Pencil: