Baked Normal Map Is Not Equal To The Original Normal Map. #106439

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Ahmed Jarad · 2023-04-01T22:16:12+02:00

Ahmed Jarad commented

2023-04-01 22:16:12 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon RX 570 Series ATI Technologies Inc. 4.5.0 Core Profile Context 22.Q4.221025

Blender Version
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: rB1eb06de2607a
Worked: (newest version of Blender that worked as expected)

Short description of error
The problem that after I bake the normal it appears different than the original
,Is this a bug ? , and why it appears different .

Exact steps for others to reproduce the error

Open blender
Go to the shading window
Select The cube
Add normal map image connect it to the normal map after you add it , Then to the BSDF node
create image to bake to it and select it
bake the normal and see the result

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Radeon RX 570 Series ATI Technologies Inc. 4.5.0 Core Profile Context 22.Q4.221025 **Blender Version** Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: `rB1eb06de2607a` Worked: (newest version of Blender that worked as expected) **Short description of error** The problem that after I bake the normal it appears different than the original ,Is this a bug ? , and why it appears different . **Exact steps for others to reproduce the error** 1. Open blender 2. Go to the shading window 3. Select The cube 4. Add normal map image connect it to the normal map after you add it , Then to the BSDF node 5. create image to bake to it and select it 6. bake the normal and see the result

Blender [D CFolder every thing blender .blend TMP NormalTest.blend] 2023-04-01 23-06-14.mp4

764 KiB

👍 1

Ahmed Jarad added the

labels 2023-04-01 22:16:12 +02:00

Ahmed Jarad commented

2023-04-01 22:21:29 +02:00

The strength of both normal map nodes = 1 if it is not clear in the video.

YimingWu commented

2023-04-02 07:41:48 +02:00

Can you set up a test scene with a normal map image for us to try out? From the look of your video, it seems that whatever source of your normal map might not be normalized or it has overflowing values that could be technically incorrect (like the length of the normal being not 1, etc), so it's not quite possible to determine what problem there is exactly without your file setup. Thanks!

YimingWu added

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Status

Needs Triage

labels 2023-04-02 07:41:59 +02:00

Ahmed Jarad commented

2023-04-02 14:37:35 +02:00

[

TMP_NormalTest.blend

7.1 MiB

YimingWu commented

2023-04-02 16:50:41 +02:00

Can confirm the issue, reproducible in up to 3.6 as well.

Tried to find out the pattern, looks like baked normal map has B channel clamped to around [0.85, 1] instead of [0.5, 1]. I'm not sure how exactly things work with baking normal map on a already normal mapped object, maybe the result is expected, as it's mostly just affecting regions around the very deep gaps. Maybe rendering guys should take a look.

Can confirm the issue, reproducible in up to 3.6 as well. Tried to find out the pattern, looks like baked normal map has B channel clamped to around [0.85, 1] instead of [0.5, 1]. I'm not sure how exactly things work with baking normal map on a already normal mapped object, maybe the result is expected, as it's mostly just affecting regions around the very deep gaps. Maybe rendering guys should take a look.

👍 1

YimingWu added

and removed

Needs Information from User

labels 2023-04-02 16:51:00 +02:00

YimingWu referenced this issue

2023-05-15 07:35:06 +02:00