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Maniphest T75469

AO shader artifacts
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Description

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: rB375c7dc4caf4
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.blend707 KBDownload

Related Objects

Event Timeline

Massimiliano Puliero (mmaaxx) created this task.Apr 7 2020, 6:35 AM
Alaska (Alaska) added a subscriber: Alaska (Alaska).Apr 7 2020, 11:13 AM

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 (lichtwerk) changed the task status from Needs Triage to Confirmed.Apr 7 2020, 2:10 PM
Philipp Oeser (lichtwerk) added a project: Cycles.
Philipp Oeser (lichtwerk) changed the subtype of this task from "Report" to "Bug".
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).
In T75469#905151, @Alaska (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 (lichtwerk) added a subscriber: Brecht Van Lommel (brecht).Apr 7 2020, 2:18 PM

Might be a duplicate of the following though:

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

CC @Brecht Van Lommel (brecht)

Philipp Oeser (lichtwerk) changed the subtype of this task from "Bug" to "Report".Apr 7 2020, 2:23 PM
Bastien Montagne (mont29) added a project: Render & Cycles.Apr 22 2020, 5:28 PM
Brecht Van Lommel (brecht) closed this task as Archived.May 14 2020, 2:22 AM
Brecht Van Lommel (brecht) claimed this task.

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.

Germano Cavalcante (mano-wii) mentioned this in T78981: Broken mesh/file: AO fails on certain mesh if it is elevated above floor..Jul 16 2020, 5:17 PM
Brecht Van Lommel (brecht) merged a task: T78981: Broken mesh/file: AO fails on certain mesh if it is elevated above floor..Jul 16 2020, 5:18 PM
Brecht Van Lommel (brecht) added subscribers: Vyacheslav (hitrpr), Germano Cavalcante (mano-wii).
Philipp Oeser (lichtwerk) mentioned this in T82073: AO node bug.Oct 26 2020, 11:23 AM
Philipp Oeser (lichtwerk) merged a task: T82073: AO node bug.
Philipp Oeser (lichtwerk) added a subscriber: CJ L (pitibonom).
Philipp Oeser (lichtwerk) mentioned this in T85057: Baking ambient occlusion to vertex colors produces black spots.Jan 26 2021, 11:55 AM
Philipp Oeser (lichtwerk) merged a task: T85057: Baking ambient occlusion to vertex colors produces black spots.
Philipp Oeser (lichtwerk) added a subscriber: Tom Smalley (tomsmalley).
Philipp Oeser (lichtwerk) mentioned this in T84676: material changes in relation to the object's position in world space.Feb 1 2021, 5:20 PM