Geometry Nodes Extrude producing weird normals when Mesh has Custom Normals #106926

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opened 2023-04-14 05:20:22 +02:00 by Robert-Kouts-2 · 3 comments

Robert-Kouts-2 commented

2023-04-14 05:20:22 +02:00

System Information
Operating system: Windows 10
Graphics card: RTX 3070

Blender Version
Broken: 3.4.1 and 3.5
Worked: 3.3 LTS

Short description of error
Geometry Nodes "Extrude Mesh" node produces weird normals on "side" area when mesh has custom normals. The issue is present no matter how the custom normals were formed, whether with a Data Transfer modifier or by enabling "Custom Split Normals Data". The issue is present regardless of whether "Individual" is enabled on the Extrude node.

Exact steps for others to reproduce the error
0. Use Blender 3.4 or 3.5
1. Create a plane and subdivide it
2. Enable "Auto Smooth" in the geometry settings
3. Enable "Custom Split Normals Data" in the geometry settings
4. Add an Extrude geometry node, and play with the "offset scale", see how the sides of the mesh have extremely weird normals.

See attached Blender file.

@HooglyBoogly requested me to mention him in the description.

**System Information** Operating system: Windows 10 Graphics card: RTX 3070 **Blender Version** Broken: 3.4.1 and 3.5 Worked: 3.3 LTS **Short description of error** Geometry Nodes "Extrude Mesh" node produces weird normals on "side" area when mesh has custom normals. The issue is present no matter how the custom normals were formed, whether with a Data Transfer modifier or by enabling "Custom Split Normals Data". The issue is present regardless of whether "Individual" is enabled on the Extrude node. **Exact steps for others to reproduce the error** 0. Use Blender 3.4 or 3.5 1. Create a plane and subdivide it 2. Enable "Auto Smooth" in the geometry settings 3. Enable "Custom Split Normals Data" in the geometry settings 4. Add an Extrude geometry node, and play with the "offset scale", see how the sides of the mesh have extremely weird normals. See attached Blender file. @HooglyBoogly requested me to mention him in the description.

BugReport.blend

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Screenshot 2023-04-14 130458.png

314 KiB

Screenshot 2023-04-14 130458.png

Robert-Kouts-2 added the

labels 2023-04-14 05:20:23 +02:00

Iliya Katushenock added the

Nodes & Physics

labels 2023-04-14 05:28:32 +02:00

Richard Antalik added

Nodes & Physics

and removed

labels 2023-04-14 08:12:45 +02:00

Philipp Oeser commented

2023-04-14 10:58:57 +02:00

Member

This seems to have improved in current master again, but it is still wrong there, too.

Will bisect the two "stages" of this bug

This seems to have improved in current master again, but it is still wrong there, too. Will bisect the two "stages" of this bug

Philipp Oeser added the

label 2023-04-14 11:06:48 +02:00

Philipp Oeser commented

2023-04-14 13:17:04 +02:00

Member

This first regressed in e412fe1798
Second step was 1af62cb3bf
Then it got a lot better in 16fbadde36
But worse again in current main.

Also note that opening the file and just reverting it might change appearance
So it seems the extrude is sensible to layout of the customdata? Something wrong being uploaded to the GPU (pure speculation)?

CC @HooglyBoogly : will raise prio since this might reveal an underlying issue that is important enough to fix short-term?

This first regressed in e412fe17986ad92963bbc901865c46cf4dda5de1 Second step was 1af62cb3bf46f0cd328ab0840a1363eca938c628 Then it got a lot better in 16fbadde363c8074ec725fa1e1079add096bd741 But worse again in current main. Also note that opening the file and just reverting it might change appearance So it seems the extrude is sensible to layout of the customdata? Something wrong being uploaded to the GPU (pure speculation)? CC @HooglyBoogly : will raise prio since this might reveal an underlying issue that is important enough to fix short-term?

Philipp Oeser added

and removed

Nodes & Physics

labels 2023-04-14 13:17:45 +02:00

Hans Goudey referenced this issue from a commit

2023-04-14 16:07:59 +02:00

Fix: Remove unsupported data types in extrude and split edges nodes

Hans Goudey closed this issue

2023-04-14 16:08:00 +02:00

Blender Bot added

and removed

labels 2023-04-14 16:08:02 +02:00

Hans Goudey commented

2023-04-14 18:00:25 +02:00

Member

Thanks for the investigation. Since it seems the error was uninitialized memory from the start, the fact that those commits helped was probably a bit random. I'm not sure about the best way to handle custom normals while extruding anyway, so for now I just removed them.

Thanks for the investigation. Since it seems the error was uninitialized memory from the start, the fact that those commits helped was probably a bit random. I'm not sure about the best way to handle custom normals while extruding anyway, so for now I just removed them.

Hans Goudey referenced this issue

2023-04-17 04:03:12 +02:00

3.5: Candidates for corrective releases #106258

Thomas Dinges referenced this issue from a commit

2023-04-20 15:15:30 +02:00

Fix: Remove unsupported data types in extrude and split edges nodes

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