2.93 screen space reflection/refraction (?) regressions - white artifacts and missing translucency glow #86858

New Issue

nameless · 2021-03-23T19:28:05+01:00

nameless commented

2021-03-23 19:28:05 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.72

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-22 17:02, hash: 62987a6f98
Worked: 2.92

This changed in 6842c549bb or ba75ea8012

Short description of error
The nice blue, bright glow through glass is gone and there are white blown-out artifacts on wet floor

Exact steps for others to reproduce the error

load .blend file of simplified scene in 2.92.0 and 2.93.0 (2021-03-22)
compare visuals marked on screenshots

Simplified .blend file download link - https://drive.google.com/file/d/1JLefegHMn2EqGlx_1_P3fCs7BSAFrdYM/view?usp=sharing

! Important note for developer - if you delete material on character standing in door, reflection artifacts are gone. So I guess there's some buggy interaction between that material and reflection/SSR

While white blown-out artifacts on floor is probably just a bug, I fear that lack of glow through glass might be a side effect of some rework on translucency/SSR. If that's the case, will I be able to keep 2.92's glow through glass somehow in 2.93? 2.93 looks very bland compared 2.92, although I suspect developers might say that's just how it's more accurate :(

Marked screenshots for comparison:

2.93:

2.92:

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.72 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-22 17:02, hash: `62987a6f98` Worked: 2.92 This changed in 6842c549bb or ba75ea8012 **Short description of error** The nice blue, bright glow through glass is gone and there are white blown-out artifacts on wet floor **Exact steps for others to reproduce the error** 1. load .blend file of simplified scene in 2.92.0 and 2.93.0 (2021-03-22) 2. compare visuals marked on screenshots Simplified .blend file download link - https://drive.google.com/file/d/1JLefegHMn2EqGlx_1_P3fCs7BSAFrdYM/view?usp=sharing ! Important note for developer - if you delete material on character standing in door, reflection artifacts are gone. So I guess there's some buggy interaction between that material and reflection/SSR While white blown-out artifacts on floor is probably just a bug, I fear that lack of glow through glass might be a side effect of some rework on translucency/SSR. If that's the case, will I be able to keep 2.92's glow through glass somehow in 2.93? 2.93 looks very bland compared 2.92, although I suspect developers might say that's just how it's more accurate :( Marked screenshots for comparison: 2.93: ![image.png](https://archive.blender.org/developer/F9905864/image.png) 2.92: ![image.png](https://archive.blender.org/developer/F9905867/image.png)

nameless commented

2021-03-23 19:28:05 +01:00

Added subscriber: @tonpix

Germano Cavalcante commented

2021-03-25 21:29:02 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-03-25 21:29:02 +01:00

I can't replicate the bug, this is the result I see in the viewport:

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.14760 Core Profile Context 20.45.37.01 27.20.14537.1001

Blender Version
version: 2.93.0 Alpha, branch: master, commit date: 2021-03-22 17:02, hash: 62987a6f98

I can't replicate the bug, this is the result I see in the viewport: ![tmp.png](https://archive.blender.org/developer/F9909802/tmp.png) --- **System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.14760 Core Profile Context 20.45.37.01 27.20.14537.1001 **Blender Version** version: 2.93.0 Alpha, branch: master, commit date: 2021-03-22 17:02, hash: `62987a6f98`

nameless commented

2021-03-25 23:24:06 +01:00

It's missing blue glow on glasses. Agreed on white reflection artifacts though, you don't have those, unlike me. But I've noticed too your glass look very different from me, I can't see water droplets and there's some large-scale warping noise going on.

Thanks for checking!

It's missing blue glow on glasses. Agreed on white reflection artifacts though, you don't have those, unlike me. But I've noticed too your glass look very different from me, I can't see water droplets and there's some large-scale warping noise going on. Thanks for checking!

nameless commented

2021-04-21 20:07:43 +02:00

I've checked out 2.93 Beta committed 20 April 15:45, the white-blown out artifacts on wet floor seem to be gone, but there's still regression/change on how bright blue light passes through glass - comparison pics are still up to date in the original post. Can I ask for some update/triaging/dev comment? I don't know if it can't be reproduced, or if it's bug or side effect rework of reflection/translucency code.

Philipp Oeser commented

2021-06-02 17:37:45 +02:00

Added subscribers: @fclem, @lichtwerk

Philipp Oeser commented

2021-06-02 17:37:45 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Philipp Oeser commented

2021-06-02 17:37:45 +02:00

So, this changed in 6842c549bb or ba75ea8012

Simplified the file a tiny tad so only the relevant emitters are contributing (in fact, we are talking about a refraction of a single material).
repro.blend

Afraid we'll have to ask @fclem for his wisdom here, because it might very well be that the super-bright (in this case nice-looking) rim is in fact a gazing-angle failure.

So, this changed in 6842c549bb or ba75ea8012 Simplified the file a tiny tad so only the relevant emitters are contributing (in fact, we are talking about a refraction of a single material). [repro.blend](https://archive.blender.org/developer/F10154424/repro.blend) Afraid we'll have to ask @fclem for his wisdom here, because it might very well be that the super-bright (in this case nice-looking) rim is in fact a gazing-angle failure.

nameless commented

2021-06-02 17:41:10 +02:00

I thought I noted it there, but seems it slipped out of mind. But I've managed to get that super-bright rim back by adjusting Clamp, IIRC, to either 0 or very high value.

(EDIT: this is just example screenshot, in animation project Refraction is enabled :) )

I thought I noted it there, but seems it slipped out of mind. But I've managed to get that super-bright rim back by adjusting Clamp, IIRC, to either 0 or very high value. ![image.png](https://archive.blender.org/developer/F10154458/image.png) (EDIT: this is just example screenshot, in animation project Refraction is enabled :) )

Philipp Oeser commented

2021-06-02 17:54:58 +02:00

Rasing clamp, I can only get it to blow out uniformly

2.92 was more on the rim (but like I said, this might very well be gazing-angle failure instead)

Rasing clamp, I can only get it to blow out uniformly ![image.png](https://archive.blender.org/developer/F10154477/image.png) 2.92 was more on the rim (but like I said, this might very well be gazing-angle failure instead) ![image.png](https://archive.blender.org/developer/F10154479/image.png)

Clément Foucault commented

2021-06-02 18:07:21 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Resolved'

Clément Foucault closed this issue

2021-06-02 18:07:21 +02:00

Clément Foucault self-assigned this 2021-06-02 18:07:21 +02:00

Clément Foucault commented

2021-06-02 18:07:21 +02:00

I've investigated and.... it was a bug that has been fixed 2.93. Basically the clamp on SSR rays was not applied to really sharp refractions in 2.92. In 2.93 they are correctly clamped to avoid discrepency with rougher surfaces.

If you want to have more brightness you can increase Render Settings > Screen Space Reflections > Clamp . If you want to preserve the rim lighting, better change the emissive material behind the glass.

Simpler file.repro(2).blend

I've investigated and.... it was a bug that has been fixed 2.93. Basically the clamp on SSR rays was not applied to really sharp refractions in 2.92. In 2.93 they are correctly clamped to avoid discrepency with rougher surfaces. If you want to have more brightness you can increase `Render Settings > Screen Space Reflections > Clamp` . If you want to preserve the rim lighting, better change the emissive material behind the glass. Simpler file.[repro(2).blend](https://archive.blender.org/developer/F10154499/repro_2_.blend)

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

2.93 screen space reflection/refraction (?) regressions - white artifacts and missing translucency glow #86858