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Maniphest T100788

Regression: Backface of mesh appears as completely back when using a normal map texture with ambient occlusion enabled in Eevee
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Description

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94

Blender Version
Broken: version: 3.3.0 Release Candidate, branch: master, commit date: 2022-09-02 20:48, hash: rB831ed297d0a0
Worked: 3.3.0 Beta, branch: master, commit date: 2022-08-28 21:53, hash: 7b56c7488106
First bad commit: rB07cf3ce92fa2: Fix T100377: EEVEE: Regression 3.2 normalmap node broken

Short description of error
When using a normal map image, the backface of the mesh appears as black. This was not happening with the previous 3.3 build I was using.
If I disable Ambient Occlusion, this behavior does not happen.


the backface is black in the latest build


the backface looks good in the previous build

Exact steps for others to reproduce the error

  1. Attach a normal map to a plane
  2. Enable Ambient Occlusion
  3. The backface of the plane will appear as completely black, while previously it didn't using the same normal map

Here is a .blend displaying the behavior:

bugnormal.blend3 MBDownload

Revisions and Commits

rB Blender
rBb0d9b6f6df23 Fix T100788 Regression: EEVEE wrong normal map on backfaces

Related Objects

Event Timeline

Matteo Scopel (scopelma) created this task.Sep 3 2022, 10:52 AM
Matteo Scopel (scopelma) added a project: EEVEE & Viewport.
Matteo Scopel (scopelma) updated the task description. (Show Details)Sep 3 2022, 10:55 AM
Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).Sep 3 2022, 11:22 AM
Pratik Borhade (PratikPB2123) changed the task status from Needs Triage to Confirmed.Sep 3 2022, 11:46 AM

Thanks for the report. I can confirm. Checking when it was changed

Pratik Borhade (PratikPB2123) triaged this task as High priority.Sep 3 2022, 11:57 AM
Pratik Borhade (PratikPB2123) added a subscriber: Clément Foucault (fclem).

First bad commit : rB07cf3ce92fa2: Fix T100377: EEVEE: Regression 3.2 normalmap node broken
@Clément Foucault (fclem) ^

Pratik Borhade (PratikPB2123) updated the task description. (Show Details)Sep 3 2022, 11:58 AM
Philipp Oeser (lichtwerk) renamed this task from Backface of mesh appears as completely back when using a normal map texture with ambient occlusion enabled in Eevee to Regression: Backface of mesh appears as completely back when using a normal map texture with ambient occlusion enabled in Eevee.Sep 3 2022, 12:29 PM
Clément Foucault (fclem) closed this task as Resolved by committing rBb0d9b6f6df23: Fix T100788 Regression: EEVEE wrong normal map on backfaces.Sep 5 2022, 9:13 AM
Clément Foucault (fclem) claimed this task.
Clément Foucault (fclem) added a commit: rBb0d9b6f6df23: Fix T100788 Regression: EEVEE wrong normal map on backfaces.