Maniphest T101477

when 2 objects have the same position, rotation and scale one of the 2 turns black
Closed, Duplicate
Actions

Assigned To
None
Authored By
Piergiorgio (Piergiorgio_PG)
Sep 29 2022, 6:45 PM
Tags
  • BF Blender
  • Render & Cycles
Subscribers
Brecht Van Lommel (brecht)
Germano Cavalcante (mano-wii)
Iliya Katueshenock (Moder)
Piergiorgio (Piergiorgio_PG)
Richard Antalik (ISS)

Description

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: rB0759f671ce1f
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

  1. Open General template
  2. Add new cube
  3. Render in Cycles

Cubes are black.

Related Objects

Event Timeline

Piergiorgio (Piergiorgio_PG) created this task.Sep 29 2022, 6:45 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Sep 29 2022, 8:23 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

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 (ISS) added a comment.Sep 29 2022, 8:35 PM
This comment was removed by Richard Antalik (ISS).
Iliya Katueshenock (Moder) added a subscriber: Iliya Katueshenock (Moder).EditedSep 30 2022, 12:10 AM

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.

Piergiorgio (Piergiorgio_PG) added a comment.Sep 30 2022, 9:30 AM

Hi attached what I experienced

Iliya Katueshenock (Moder) changed the task status from Needs Information from User to Needs Information from Developers.Sep 30 2022, 10:07 AM

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

Iliya Katueshenock (Moder) added a project: Render & Cycles.Sep 30 2022, 10:08 AM

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

Richard Antalik (ISS) updated the task description.Sep 30 2022, 3:16 PM
Germano Cavalcante (mano-wii) added subscribers: Brecht Van Lommel (brecht), Germano Cavalcante (mano-wii).Sep 30 2022, 3:25 PM

This is certainly the same issue described in T96475: Overlapping geometry shows black faces on Cycles Blender 3.1 (Ray Tracing Precision).
Therefore:

In T96475#1323543, @Brecht Van Lommel (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

Germano Cavalcante (mano-wii) closed this task as a duplicate of T96475: Overlapping geometry shows black faces on Cycles Blender 3.1 (Ray Tracing Precision).Sep 30 2022, 3:25 PM