Page MenuHome
Create Task
Maniphest T82073

AO node bug
Closed, DuplicatePublic
Actions

Description

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GT 610/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Also broken in 2.79.6
Worked: (newest version of Blender that worked as expected)

Short description of error
AO node generates some strange black strips on object.

Exact steps for others to reproduce the error
Get the blend and look at it in 3D view rendered mode.

Note those artifacts also appear in texture bakes.

AO bug.blend836 KBDownload

Related Objects

Event Timeline

CJ L (pitibonom) created this task.Oct 25 2020, 8:32 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).Oct 26 2020, 11:23 AM

I think this is a combination of two things:

number one is related to these reports
T61066: wrong normal interpolations with AO node
T70988: Ambient Occlusion black artefact issues when moving object too far in 3d space
T43835: ray offsetting giving precission problems / render artifacts / cracks on far away geometry
T75469: AO shader artifacts
(ray offsetting giving precission problems on far away geometry -- this one could be worked around by moving the geometry closer to the origin)

The other one is related to this
T73767: ambient occlusion and shade smooth
(has the same roots, ray offsetting)

All these were not considered bugs, it is just a known thing which will eventually be solved by D6250: Fix T43835, T54284: Cycles with no ray offsetting.
So, we could close this as all the other reports, will merge into T75469: AO shader artifacts

Philipp Oeser (lichtwerk) closed this task as a duplicate of T75469: AO shader artifacts.Oct 26 2020, 11:23 AM