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Regression: Blender 4.0 Beta - Bump Node Issue #113942

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opened 2023-10-19 16:38:57 +02:00 by Dylan-10 · 6 comments
Dylan-10 commented 2023-10-19 16:38:57 +02:00
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System Information
Operating system: MacOS Ventura 13.4.1
Graphics card: M1 Ultra

Blender Version
Broken: (example: 4.0.0 Beta, e11f031d62cc,)
Worked: 3.6.4

Caused by 51923c09e2

Weird line Bump Node

Exact steps for others to reproduce the error
Hello, I've seen a problem when opening the same file without any change.
I've weird line/artifact that appear on my texture on Blender 4.0.0 Beta, I know it's a Beta and not a finish product but it was just for testing new features.

**System Information** Operating system: MacOS Ventura 13.4.1 Graphics card: M1 Ultra **Blender Version** Broken: (example: 4.0.0 Beta, e11f031d62cc,) Worked: 3.6.4 Caused by 51923c09e2674ecfb3aee77fe67b44d97e22be11 **Weird line Bump Node** **Exact steps for others to reproduce the error** Hello, I've seen a problem when opening the same file without any change. I've weird line/artifact that appear on my texture on Blender 4.0.0 Beta, I know it's a Beta and not a finish product but it was just for testing new features.
Capture d’écran 2023-10-19 à 16.29.51.png
561 KiB
Capture d’écran 2023-10-19 à 16.30.08.png
505 KiB
Capture d’écran 2023-10-19 à 16.29.51.png Capture d’écran 2023-10-19 à 16.30.08.png
Dylan-10 added the
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 labels 2023-10-19 16:38:57 +02:00
Iliya Katushenock changed title from Blender 4.0 Beta - Bump Node Issue to Regression: Blender 4.0 Beta - Bump Node Issue 2023-10-19 17:40:34 +02:00
Jesse Yurkovich commented 2023-10-19 22:10:13 +02:00
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Please attach a small example .blend file with textures that demonstrates the issue so we can reproduce.

Please attach a small example .blend file with textures that demonstrates the issue so we can reproduce.
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Dylan-10 commented 2023-10-20 08:47:08 +02:00
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Hello,

I've reproduce this bug with an other blank project. Here's the .blend file

Thank you very much.

Hello, I've reproduce this bug with an other blank project. Here's the .blend file Thank you very much.
Bump texture issue.blend
1.4 MiB
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Philipp Oeser commented 2023-10-20 11:58:58 +02:00
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Can confirm a change in behavior, this changed between 1ad4f67d78 and 8c6908eba5

Can confirm a change in behavior, this changed between 1ad4f67d7802 and 8c6908eba578
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Philipp Oeser commented 2023-10-20 13:04:38 +02:00
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Caused by 51923c09e2

Not sure if this is to be expected? Looks like inferior results to me

CC @brecht
CC @weizhen

Of course this might be expected, but will still raise prio for now.

Caused by 51923c09e2674ecfb3aee77fe67b44d97e22be11 Not sure if this is to be expected? Looks like inferior results to me CC @brecht CC @weizhen Of course this might be expected, but will still raise prio for now.
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Weizhen Huang commented 2023-10-20 15:31:59 +02:00
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This is bad, the algorithm has a discontinuity when z switches the sign, so N = {0.906022, -0.423203, -0.004779} would give a T of {0.183028, 0.381608, 0.906022}, but N = {0.906022, -0.423203, 0.004779} gives T = {0.183028, 0.381608, -0.906022}.
Probably this algorithm is more suitable when TBN is in the local shading frame instead of the global frame we are using.

This is bad, the algorithm has a discontinuity when z switches the sign, so N = {0.906022, -0.423203, -0.004779} would give a T of {0.183028, 0.381608, **0.906022**}, but N = {0.906022, -0.423203, 0.004779} gives T = {0.183028, 0.381608, **-0.906022**}. Probably this algorithm is more suitable when TBN is in the local shading frame instead of the global frame we are using.
Brecht Van Lommel commented 2023-10-20 17:29:14 +02:00
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At this point in the release cycle, I think the best solution is to revert this change. I will handle it.

At this point in the release cycle, I think the best solution is to revert this change. I will handle it.
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Reference: blender/blender#113942
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