Baking normal maps for transformed objects is broken (3.0) #91894

New Issue

Andrei Alexeyev · 2021-10-02T10:28:11+02:00

Andrei Alexeyev commented

2021-10-02 10:28:11 +02:00

System Information
Operating system: openSUSE Tumbleweed
Graphics card: N/A, using CPU rendering

Blender Version
Broken: 3.0 alpha 12e8c783535c (official build) — didn't bisect, but pretty sure it was broken in the cycles-x branch even before the merge.
Worked: Prior to Cycles-X merge

Short description of error
When baking a normal map for an object that has transformations, the result is heavily distorted and unusable. This seems to manifest most prominently with rotations. Clearing or applying the transforms before baking produces correct results.

Exact steps for others to reproduce the error

Open this file
Select the "Transformed - BROKEN" object.
Press "bake" in the render properties panel.
You should see something like this in the UV editor panel:
Repeat 2 and 3 with the "Untransformed - OK object"
You should now see something like this:

Test File:
normalbug.blend

**System Information** Operating system: openSUSE Tumbleweed Graphics card: N/A, using CPU rendering **Blender Version** Broken: 3.0 alpha `12e8c783535c` (official build) — didn't bisect, but pretty sure it was broken in the cycles-x branch even before the merge. Worked: Prior to Cycles-X merge **Short description of error** When baking a normal map for an object that has transformations, the result is heavily distorted and unusable. This seems to manifest most prominently with rotations. Clearing or applying the transforms before baking produces correct results. **Exact steps for others to reproduce the error** 1. Open this file 2. Select the "Transformed - BROKEN" object. 3. Press "bake" in the render properties panel. 4. You should see something like this in the UV editor panel: ![bad.png](https://archive.blender.org/developer/F10730229/bad.png) 5. Repeat 2 and 3 with the "Untransformed - OK object" 6. You should now see something like this: ![good.png](https://archive.blender.org/developer/F10730227/good.png) Test File: [normalbug.blend](https://archive.blender.org/developer/F10731620/normalbug.blend)

Andrei Alexeyev commented

2021-10-02 10:28:11 +02:00

Added subscriber: @Akaricchi

Steffen Dünner commented

2021-10-02 11:18:48 +02:00

Added subscriber: @SteffenD

Steffen Dünner commented

2021-10-02 11:18:48 +02:00

This somehow reminds me of a bug that I reported some time ago https://developer.blender.org/T90854

Pratik Borhade commented

2021-10-02 12:41:27 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-10-02 12:58:39 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Pratik Borhade commented

2021-10-02 12:58:39 +02:00

Hi, thanks for the report. This is actually working with the builds prior to Cycles-X merge.

Will set it to High priority for now

Working	`13a4bccdb1`
Broken	`4d881d9dad`

blender-admin commented

2021-10-04 12:28:28 +02:00

This issue was referenced by blender/cycles@89c83bef09

This issue was referenced by blender/cycles@89c83bef0946ea3b07bcc211922ca7c5c3529b14

blender-admin commented

2021-10-04 12:28:28 +02:00

This issue was referenced by fc4886a314

This issue was referenced by fc4886a31426b6fe40982f5288c8d129a1ce3223

Brecht Van Lommel commented

2021-10-04 14:10:10 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue

2021-10-04 14:10:10 +02:00

Brecht Van Lommel self-assigned this 2021-10-04 14:10:10 +02:00

Andrei Alexeyev commented

2021-10-05 08:29:06 +02:00

@brecht Unfortunately, this is still not fully resolved. It looks like the "Geometry" shader node, specifically its "Position" output, is also sensitive to object transformations.

Here is an example taken from a real project: roof.blend

Baking the untransformed object results in this (good):

But baking the transformed object results in this (bad):

(The difference may be hard to see on the thumbnails)

Also, apparently this affects all bake types, not just normals. Should I open a separate bug for this?

@brecht Unfortunately, this is still not fully resolved. It looks like the "Geometry" shader node, specifically its "Position" output, is also sensitive to object transformations. Here is an example taken from a real project: [roof.blend](https://archive.blender.org/developer/F10775694/roof.blend) Baking the untransformed object results in this (good): ![good.png](https://archive.blender.org/developer/F10775708/good.png) But baking the transformed object results in this (bad): ![bad.png](https://archive.blender.org/developer/F10775718/bad.png) (The difference may be hard to see on the thumbnails) Also, apparently this affects all bake types, not just normals. Should I open a separate bug for this?

Alaska commented

2021-10-05 09:07:47 +02:00

Added subscriber: @Alaska

Alaska commented

2021-10-05 09:07:47 +02:00

In #91894#1230872, @Akaricchi wrote:
Should I open a separate bug for this?

Yes you should.

> In #91894#1230872, @Akaricchi wrote: > Should I open a separate bug for this? Yes you should.

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Baking normal maps for transformed objects is broken (3.0) #91894