Regression: Overlapping face renders black in render mode #96958

New Issue

rawee · 2022-04-01T21:28:22+02:00

rawee commented

2022-04-01 21:28:22 +02:00

System Information
Operating system: windows
Graphics card: gtx , rtx

Blender Version
Broken between: c4bedeb018 - 0379ddac7d

Short Description
Overlapping faces renders black in both viewport and final render (Cycles render engine)

Steps to Reproduce

Open attached file
Switch to Cycles render engine
Change viewport shading to render (or render as image/animation)

#96958.blend

**System Information** Operating system: windows Graphics card: gtx , rtx **Blender Version** Broken between: c4bedeb0186b - 0379ddac7d68 **Short Description** Overlapping faces renders black in both viewport and final render (Cycles render engine) **Steps to Reproduce** - Open attached file - Switch to Cycles render engine - Change viewport shading to render (or render as image/animation) [#96958.blend](https://archive.blender.org/developer/F12963255/T96958.blend) ![FOGy-XUVkAA8EQM.jpg](https://archive.blender.org/developer/F12962543/FOGy-XUVkAA8EQM.jpg)

rawee commented

2022-04-01 21:28:22 +02:00

Added subscriber: @rawee-4

blender-admin commented

2022-04-01 21:28:22 +02:00

#96995 was marked as duplicate of this issue

blender-admin commented

2022-04-01 21:28:22 +02:00

#96996 was marked as duplicate of this issue

Germano Cavalcante commented

2022-04-01 22:27:17 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-04-01 22:27:17 +02:00

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

Germano Cavalcante commented

2022-04-01 22:27:17 +02:00

Thanks for the report, but could you provide a file and steps to reproduce the problem?
Also, as a suggestion, please use Help -> Report a Bug in Blender so there is complete information about the Blender version and graphics cards.

Thanks for the report, but could you provide a file and steps to reproduce the problem? Also, as a suggestion, please use `Help -> Report a Bug` in Blender so there is complete information about the Blender version and graphics cards.

Pratik Borhade commented

2022-04-02 04:34:43 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-04-02 04:34:43 +02:00

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

Pratik Borhade commented

2022-04-02 04:34:43 +02:00

I can confirm actually. This was broken between c4bedeb018 - 0379ddac7d

@mano-wii , will you be able to bisect? Could be hard if you've old AMD GPU #95237 (AMD GPU: Crash on startup)

I can confirm actually. This was broken between c4bedeb0186b - 0379ddac7d68 @mano-wii , will you be able to bisect? Could be hard if you've old AMD GPU #95237 (AMD GPU: Crash on startup)

Pratik Borhade changed title from ~~overlap face is black in render mode~~ to Regression: Overlapping face renders black in render mode

2022-04-02 04:38:47 +02:00

dupoxy commented

2022-04-02 05:22:38 +02:00

Added subscriber: @dupoxy

dupoxy commented

2022-04-02 05:22:38 +02:00

This looks like #96475 .
It is not a good trade-off .

In #96475#1323188, @Alaska wrote:

It looks like this is a known issue. As noted in the release notes:

There can still be artifacts with rendering overlapping geometry, in some cases more severe than before. Such overlapping geometry should be removed, or have a small distance added in between.

This looks like #96475 . It is not a good trade-off . >> In #96475#1323188, @Alaska wrote: > It looks like this is a known issue. As noted in the release notes: > >> There can still be artifacts with rendering overlapping geometry, in some cases more severe than before. Such overlapping geometry should be removed, or have a small distance added in between. >

dupoxy commented

2022-04-02 05:29:05 +02:00

Added subscriber: @Alaska

Juan Gea commented

2022-04-02 15:18:16 +02:00

Added subscriber: @juang3d

Juan Gea commented

2022-04-02 15:18:16 +02:00

IMHO this is a perfectly acceptable trade off, this is and old known problem called Z fighting, and when it was more permisible and you rendered an animation then suddenly you realized weird flickers and problems derived from this problem.

Now you identify this, and in any case this is a bad practice that should be avoided at all costs, so IMO it’s not just a trade off but nearly a feature.

IMHO this is a perfectly acceptable trade off, this is and old known problem called Z fighting, and when it was more permisible and you rendered an animation then suddenly you realized weird flickers and problems derived from this problem. Now you identify this, and in any case this is a bad practice that should be avoided at all costs, so IMO it’s not just a trade off but nearly a feature.

Alaska commented

2022-04-03 11:32:37 +02:00

Added subscriber: @Bhagath-Goud

rawee commented

2022-04-04 16:01:47 +02:00

at 3.0.1 it not have problem

start appear black in 3.1.0

thank you very much

at 3.0.1 it not have problem ![301.jpg](https://archive.blender.org/developer/F12969790/301.jpg) start appear black in 3.1.0 ![310.jpg](https://archive.blender.org/developer/F12969792/310.jpg) ![312.jpg](https://archive.blender.org/developer/F12969795/312.jpg) thank you very much

Germano Cavalcante commented

2022-04-04 16:06:16 +02:00

Added subscriber: @brecht

Germano Cavalcante commented

2022-04-04 16:06:16 +02:00

In further analysis, 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

In further analysis, 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

Germano Cavalcante commented

2022-04-04 16:06:26 +02:00

Closed as duplicate of #96475

Germano Cavalcante closed this issue

2022-04-04 16:06:26 +02:00

~~Pratik Borhade referenced this issue 2023-07-28 06:49:09 +02:00~~

Rendering in cycles causes objects with materials to go black and shiny when using the GPU #110550

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Regression: Overlapping face renders black in render mode #96958