AO node bug #82073

New Issue

CJ L · 2020-10-25T20:32:13+01:00

CJ L commented

2020-10-25 20:32:13 +01:00

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: 3e85bb34d0
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.blend

**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: `3e85bb34d0` 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.blend](https://archive.blender.org/developer/F9091045/AO_bug.blend)

CJ L commented

2020-10-25 20:32:14 +01:00

Added subscriber: @pitibonom

Philipp Oeser commented

2020-10-26 11:23:14 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-10-26 11:23:14 +01:00

I think this is a combination of two things:

number one is related to these reports
#61066 (wrong normal interpolations with AO node)
#70988 (Ambient Occlusion black artefact issues when moving object too far in 3d space)
#43835 (ray offsetting giving precission problems / render artifacts / cracks on far away geometry)
#75469 (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
#73767 (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 #43835, #54284: Cycles with no ray offsetting.
So, we could close this as all the other reports, will merge into #75469 (AO shader artifacts)

I think this is a combination of two things: number one is related to these reports #61066 (wrong normal interpolations with AO node) #70988 (Ambient Occlusion black artefact issues when moving object too far in 3d space) #43835 (ray offsetting giving precission problems / render artifacts / cracks on far away geometry) #75469 (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 #73767 (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 #43835, #54284: Cycles with no ray offsetting](https://archive.blender.org/developer/D6250). So, we could close this as all the other reports, will merge into #75469 (AO shader artifacts)

Philipp Oeser commented

2020-10-26 11:23:43 +01:00

Closed as duplicate of #75469

Philipp Oeser closed this issue

2020-10-26 11:23:43 +01:00

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AO node bug #82073