AO shader artifacts #75469

New Issue

Massimiliano Puliero · 2020-04-07T06:35:16+02:00

2020-04-07 06:35:16 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.28

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: 375c7dc4ca
Worked: blender 2.79

Short description of error
The AO shader produce black artifacts all around the mesh, the old 2.79 ao shader doesn't have this problem.

Exact steps for others to reproduce the error
open the attached file and render.

I attach here some screenshots and the file made with blender 2.82.
thankyou

Max

ao_shader_bug.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.28 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `375c7dc4ca` Worked: blender 2.79 **Short description of error** The AO shader produce black artifacts all around the mesh, the old 2.79 ao shader doesn't have this problem. **Exact steps for others to reproduce the error** open the attached file and render. I attach here some screenshots and the file made with blender 2.82. thankyou Max ![03.jpg](https://archive.blender.org/developer/F8454044/03.jpg) ![01.jpg](https://archive.blender.org/developer/F8454045/01.jpg) ![02.jpg](https://archive.blender.org/developer/F8454047/02.jpg) ![blender279.jpg](https://archive.blender.org/developer/F8454046/blender279.jpg) [ao_shader_bug.blend](https://archive.blender.org/developer/F8454052/ao_shader_bug.blend)

Massimiliano Puliero commented

2020-04-07 06:35:16 +02:00

Added subscriber: @MassimilianoPuliero

blender-admin commented

2020-04-07 06:35:16 +02:00

#85057 was marked as duplicate of this issue

blender-admin commented

2020-04-07 06:35:16 +02:00

#82073 was marked as duplicate of this issue

blender-admin commented

2020-04-07 06:35:16 +02:00

#78981 was marked as duplicate of this issue

Alaska commented

2020-04-07 11:13:52 +02:00

Added subscriber: @Alaska

Alaska commented

2020-04-07 11:13:52 +02:00

Appears to be an issue with smooth shading and how it interacts with the new AO using in new versions of Blender. Can also confirm this persists for 2.83 as of today.

Philipp Oeser commented

2020-04-07 14:10:29 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-04-07 14:10:29 +02:00

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

Philipp Oeser commented

2020-04-07 14:10:29 +02:00

In #75469#905151, @Alaska wrote:
Appears to be an issue with smooth shading and how it interacts with the new AO using in new versions of Blender. Can also confirm this persists for 2.83 as of today.

Think so, too.
Tweaking this to a lower Auto Smooth Angle will get rid of the artifacts [obviously not the solution though...]

> In #75469#905151, @Alaska wrote: > Appears to be an issue with smooth shading and how it interacts with the new AO using in new versions of Blender. Can also confirm this persists for 2.83 as of today. Think so, too. Tweaking this to a lower Auto Smooth Angle will get rid of the artifacts [obviously not the solution though...]

Philipp Oeser commented

2020-04-07 14:18:17 +02:00

Added subscriber: @brecht

Philipp Oeser commented

2020-04-07 14:18:17 +02:00

Might be a duplicate of the following though:

#73767 (ambient occlusion and shade smooth )
#70988 (Ambient Occlusion black artefact issues when moving object too far in 3d space) (really changes to move the object to the origin in the test file from this report as well)
#61066 (wrong normal interpolations with AO node)

What I dont understand is that 2.79 seems to be handling this better...

CC @brecht

Might be a duplicate of the following though: - #73767 (ambient occlusion and shade smooth ) - #70988 (Ambient Occlusion black artefact issues when moving object too far in 3d space) (really changes to move the object to the origin in the test file from this report as well) - #61066 (wrong normal interpolations with AO node) What I dont understand is that 2.79 seems to be handling this better... CC @brecht

Brecht Van Lommel commented

2020-05-14 02:22:30 +02:00

Changed status from 'Confirmed' to: 'Archived'

Brecht Van Lommel closed this issue

2020-05-14 02:22:30 +02:00

Brecht Van Lommel self-assigned this 2020-05-14 02:22:30 +02:00

Brecht Van Lommel commented

2020-05-14 02:22:30 +02:00

It's indeed a duplicate of those other bugs, and D6250 should fix it once we can get it working well enough.

The same bug actually happens in 2.79, but it depends on the object location so it won't happen adding a suzanne mesh at the origin.

It's indeed a duplicate of those other bugs, and [D6250](https://archive.blender.org/developer/D6250) should fix it once we can get it working well enough. The same bug actually happens in 2.79, but it depends on the object location so it won't happen adding a suzanne mesh at the origin.

Brecht Van Lommel commented

2020-07-16 17:18:24 +02:00

Added subscribers: @Vyach, @mano-wii

Philipp Oeser commented

2020-10-26 11:23:46 +01:00

Added subscriber: @pitibonom

Philipp Oeser commented

2021-01-26 11:55:42 +01:00

Added subscriber: @tomsmalley

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AO shader artifacts #75469