when 2 objects have the same position, rotation and scale one of the 2 turns black #101477

New Issue

Piergiorgio · 2022-09-29T18:45:37+02:00

Piergiorgio commented

2022-09-29 18:45:37 +02:00

System Information
Operating system: macOS-12.6-arm64-arm-64bit 64 Bits
Graphics card: Apple M1 Max Apple 4.1 Metal - 76.3

Blender Version
Broken: version: 3.3.0, branch: master, commit date: 2022-09-06 15:39, hash: 0759f671ce
Worked: (newest version of Blender that worked as expected)

Short description of error
when 2 objects have the same position, rotation and scale one of the 2 turns black

Exact steps for others to reproduce the error

Open General template
Add new cube

Render in Cycles

Cubes are black.

**System Information** Operating system: macOS-12.6-arm64-arm-64bit 64 Bits Graphics card: Apple M1 Max Apple 4.1 Metal - 76.3 **Blender Version** Broken: version: 3.3.0, branch: master, commit date: 2022-09-06 15:39, hash: `0759f671ce` Worked: (newest version of Blender that worked as expected) **Short description of error** when 2 objects have the same position, rotation and scale one of the 2 turns black **Exact steps for others to reproduce the error** - Open General template - Add new cube # Render in Cycles Cubes are black.

Piergiorgio commented

2022-09-29 18:45:37 +02:00

Added subscriber: @Piergiorgio_PG

Richard Antalik commented

2022-09-29 20:23:42 +02:00

Added subscriber: @iss

Richard Antalik commented

2022-09-29 20:23:42 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2022-09-29 20:23:42 +02:00

Not sure what do you mean by material maps. Can you upload sample .blend file?

From what I have tried, I wasn't able to reproduce.

Not sure what do you mean by material maps. Can you upload sample .blend file? From what I have tried, I wasn't able to reproduce.

Richard Antalik commented

2022-09-29 20:35:18 +02:00

This comment was removed by @iss

*This comment was removed by @iss*

Iliya Katushenock commented

2022-09-30 00:10:33 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-09-30 00:10:33 +02:00

If you are talking about this, then I'm not sure how the interaction of two quantum clones should be physically :) . In a sense, if the beam is reflected from both, then this is no longer correct. Fortunately, since we are talking about float coordinates, you need to specifically make them clones in order to get such an artifact.
2022-09-30 01-08-29.mp4

*If you are talking about this, then I'm not sure how the interaction of two quantum clones should be physically* :) . In a sense, if the beam is reflected from both, then this is no longer correct. Fortunately, since we are talking about float coordinates, you need to specifically make them clones in order to get such an artifact. [2022-09-30 01-08-29.mp4](https://archive.blender.org/developer/F13594029/2022-09-30_01-08-29.mp4)

Piergiorgio commented

2022-09-30 09:30:55 +02:00

Hi attached what I experienced

Cube_Black - SD 480p.mov

Hi attached what I experienced [Cube_Black - SD 480p.mov](https://archive.blender.org/developer/F13596695/Cube_Black_-_SD_480p.mov)

Iliya Katushenock commented

2022-09-30 10:07:07 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Iliya Katushenock commented

2022-09-30 10:07:07 +02:00

These models are identical. You can ask the renderers if this behavior is intended.

Iliya Katushenock commented

2022-09-30 10:08:19 +02:00

I think this can be reproduced not only in cycles, but they were taken as an example. I hope I didn't miss.

Germano Cavalcante commented

2022-09-30 15:25:20 +02:00

Added subscribers: @brecht, @mano-wii

Germano Cavalcante commented

2022-09-30 15:25:20 +02:00

This is certainly the same issue described in #96475 (Overlapping geometry shows black faces on Cycles Blender 3.1 (Ray Tracing Precision)).
Therefore:

In #96475#1323543, @brecht wrote:
This is not considered a bug currently, it's a documented trade-off of the new method.

You can see more details of this trade-off at:
https://wiki.blender.org/wiki/Reference/Release_Notes/3.1/Cycles#Ray_Tracing_Precision and
D12954: Removing ray offestting

This is certainly the same issue described in #96475 (Overlapping geometry shows black faces on Cycles Blender 3.1 (Ray Tracing Precision)). Therefore: > In #96475#1323543, @brecht wrote: > This is not considered a bug currently, it's a documented trade-off of the new method. You can see more details of this trade-off at: https://wiki.blender.org/wiki/Reference/Release_Notes/3.1/Cycles#Ray_Tracing_Precision and [D12954: Removing ray offestting](https://archive.blender.org/developer/D12954)

Germano Cavalcante commented

2022-09-30 15:25:32 +02:00

Closed as duplicate of #96475

Germano Cavalcante closed this issue

2022-09-30 15:25:32 +02:00

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when 2 objects have the same position, rotation and scale one of the 2 turns black #101477

Render in Cycles