Baking of normals show different results between versions #107930

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opened 2023-05-14 21:19:40 +02:00 by Saphi · 4 comments

Saphi commented

2023-05-14 21:19:40 +02:00

System Information
Operating system: Win 10
Graphics card: Geforce 3060

Blender Version
Broken: 3.5.1
Worked: 3.4.1

This changed in 75ad8da1ea

Short description of error

Baking of normal map differnet between Blender versions

Exact steps for others to reproduce the error
The Attached blend file will output differnt result when trying to bake the normals.
The Mesh is part of a comercial mesh I use, therefore I cannot share the whole mesh, but in the blendfile you just need to bake the normals in blender 3.4.1 and then in 3.5.1
The results are differnet.

Blender 3.5.1 seams to have some bug in the baking or handles the baking differnt.

Edit:
Seams like the Auto-Smooth of meshes bauses this difference between the versions

**System Information** Operating system: Win 10 Graphics card: Geforce 3060 **Blender Version** Broken: 3.5.1 Worked: 3.4.1 This changed in 75ad8da1ea6799e3983e4146f4b20dc4bfbb8415 **Short description of error** Baking of normal map differnet between Blender versions **Exact steps for others to reproduce the error** The Attached blend file will output differnt result when trying to bake the normals. The Mesh is part of a comercial mesh I use, therefore I cannot share the whole mesh, but in the blendfile you just need to bake the normals in blender 3.4.1 and then in 3.5.1 The results are differnet. Blender 3.5.1 seams to have some bug in the baking or handles the baking differnt. Edit: Seams like the Auto-Smooth of meshes bauses this difference between the versions

Unbenannt.JPG

11 KiB

BakeBug.blend

146 KiB

BakedBodyNormal Bug.png

1.3 MiB

BakedBodyNormal Bug.png

Saphi added the

labels 2023-05-14 21:19:41 +02:00

YimingWu commented

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

Member

Related to #106439 and #107579 .

Related to #106439 and #107579 .

YimingWu added the

Render & Cycles

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labels 2023-05-15 07:35:31 +02:00

Philipp Oeser commented

2023-05-15 10:07:10 +02:00

Member

Will check when that changed

Will check when that changed

Philipp Oeser commented

2023-05-15 11:38:28 +02:00

Member

This changed in 75ad8da1ea

@HooglyBoogly : looks like an unintentional change?

This changed in 75ad8da1ea6799e3983e4146f4b20dc4bfbb8415 @HooglyBoogly : looks like an unintentional change?

Philipp Oeser added

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Render & Cycles

labels 2023-05-15 11:39:20 +02:00

Hans Goudey self-assigned this 2023-05-18 21:58:47 +02:00

Hans Goudey referenced this issue

2023-06-20 15:55:08 +02:00

Baking Normal and Displacement from Multires is different than previous versions #109042

Hans Goudey commented

2023-06-21 17:53:01 +02:00

Member

Sorry for the delay investigating this.

This happens because before 75ad8da1ea, the split edges code took custom normals into account when deciding whether to split an edge. i.e. if the custom normals were facing in the same direction around and edge, it wouldn't be split. The new algorithm is fairly different internally, it would be difficult to take that into account. And the old behavior also had a performance cost, for something that arguably wasn't that useful.

A simple fix is changing the auto smooth angle to 180 degrees, so no splitting will happen. As a benefit, computation should be a bit faster that way too.

This is a fundamental problem with the current custom normals UX in my opinion. "Auto Smooth" and custom normals are conflated, so you need to enable auto smooth to use custom normals, and it's easy to forget to disable the automatic splitting (by maxing out the angle threshold). This is changed/fixed in #108014.

Because this is a relatively niche problem with a simple workaround, and the system will be reworked in 4.0, I'm inclined to call this a known issue.

Sorry for the delay investigating this. This happens because before 75ad8da1ea6799e3983e4146f4b20dc4bfbb8415, the split edges code took custom normals into account when deciding whether to split an edge. i.e. if the custom normals were facing in the same direction around and edge, it wouldn't be split. The new algorithm is fairly different internally, it would be difficult to take that into account. And the old behavior also had a performance cost, for something that arguably wasn't that useful. A simple fix is changing the auto smooth angle to 180 degrees, so no splitting will happen. As a benefit, computation should be a bit faster that way too. This is a fundamental problem with the current custom normals UX in my opinion. "Auto Smooth" and custom normals are conflated, so you need to enable auto smooth to use custom normals, and it's easy to forget to disable the automatic splitting (by maxing out the angle threshold). This is changed/fixed in #108014. Because this is a relatively niche problem with a simple workaround, and the system will be reworked in 4.0, I'm inclined to call this a known issue.

Hans Goudey added

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labels 2023-06-21 17:53:18 +02:00

Hans Goudey referenced this issue

2023-06-21 20:30:16 +02:00

Regression : cycles motion blur glitch on alembic hair #108415

Hans Goudey removed their assignment 2023-06-21 20:35:31 +02:00

MOTO referenced this issue

2023-06-22 14:15:40 +02:00

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Hans Goudey referenced this issue

2023-06-22 16:12:18 +02:00

Regression : cycles motion blur glitch on alembic hair #108415

~~MOTO referenced this issue 2023-06-22 16:30:03 +02:00~~

Regression : cycles motion blur glitch on alembic hair #108415

MOTO referenced this issue

2023-06-22 16:59:10 +02:00

Regression : cycles motion blur glitch on alembic hair #108415

Hans Goudey referenced this issue

2023-06-22 17:03:51 +02:00

Regression : cycles motion blur glitch on alembic hair #108415

YimingWu referenced this issue

2023-07-20 04:39:37 +02:00

Cycles: Intensity of rendered bump maps are different than Blender 3.5 and older version's renders. #110271

Pratik Borhade referenced this issue

2024-02-13 10:40:43 +01:00

Regression: Baking normal maps with smooth by angle causes artifacts to appear in baked normal map. #118127

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