Bad shading in edit mode. 2.90 regression #77607

New Issue

Vyacheslav Kobozev · 2020-06-08T09:24:19+02:00

Vyacheslav Kobozev commented

2020-06-08 09:24:19 +02:00

Blender Version
Broken: deaff945d0 (master, 2.90)
Worked: deaff945d0~

Short description of error
Simple file: bad shading edit1.blend

In 2.83:

In master (2.90):

**Blender Version** Broken: deaff945d0 (master, 2.90) Worked: deaff945d0~ **Short description of error** Simple file: [bad shading edit1.blend](https://archive.blender.org/developer/F8601585/bad_shading_edit1.blend) In 2.83: ![42023030.png](https://archive.blender.org/developer/F8601560/42023030.png) ![42040737.png](https://archive.blender.org/developer/F8601589/42040737.png) In master (2.90): ![42012130.png](https://archive.blender.org/developer/F8601561/42012130.png) ![42032636.png](https://archive.blender.org/developer/F8601586/42032636.png)

Vyacheslav Kobozev commented

2020-06-08 09:24:19 +02:00

Added subscriber: @Vyach

blender-admin commented

2020-06-08 09:24:19 +02:00

#77863 was marked as duplicate of this issue

Vyacheslav Kobozev commented

2020-06-08 09:38:19 +02:00

More info:
It can be fixed with autosmooth. So it is wrong behavior for fullsmooth normals.

2020-06-08_10-36-12.mp4

More info: It can be fixed with autosmooth. So it is wrong behavior for fullsmooth normals. [2020-06-08_10-36-12.mp4](https://archive.blender.org/developer/F8600660/2020-06-08_10-36-12.mp4)

Dalai Felinto commented

2020-06-08 09:56:01 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2020-06-08 09:56:01 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Dalai Felinto commented

2020-06-08 09:56:01 +02:00

Could you please provide a simpler sample file? Also an image comparison of how it looked before, and how it looks now.

Vyacheslav Kobozev commented

2020-06-08 10:07:42 +02:00

normals in this case are parallel

![42003005.png](https://archive.blender.org/developer/F8601150/42003005.png) normals in this case are parallel

Vyacheslav Kobozev commented

2020-06-08 11:38:45 +02:00

Should look like this. Smoothed normals

————————————————————
Looks like this

Simple file. (sorry, I did not clean previous)
bad shading edit1.blend

Should look like this. Smoothed normals ![42023030.png](https://archive.blender.org/developer/F8601560/42023030.png) ![42040737.png](https://archive.blender.org/developer/F8601589/42040737.png) ———————————————————— Looks like this ![42012130.png](https://archive.blender.org/developer/F8601561/42012130.png) ![42032636.png](https://archive.blender.org/developer/F8601586/42032636.png) Simple file. (sorry, I did not clean previous) [bad shading edit1.blend](https://archive.blender.org/developer/F8601585/bad_shading_edit1.blend)

Vyacheslav Kobozev commented

2020-06-08 11:45:08 +02:00

Last daily build have same issue.

  Blender 2.90.0 Alpha
  June 08, 00:00:19 - 281319653e5b
  Windows 64 bit 173.68MB

Last daily build have same issue. ``` Blender 2.90.0 Alpha June 08, 00:00:19 - 281319653e5b Windows 64 bit 173.68MB ```

Julian Mohr commented

2020-06-08 14:50:01 +02:00

Added subscriber: @Jewls

Julian Mohr commented

2020-06-08 14:50:01 +02:00

In #77312 we have a similar problem but it looks like modifier releated.

Dalai Felinto commented

2020-06-08 15:18:12 +02:00

Changed status from 'Needs User Info' to: 'Confirmed'

Dalai Felinto commented

2020-06-08 15:18:12 +02:00

Indeed, a strange regression. Since there is no mention of it in the release logs I'm assuming it is a bug.

Vyacheslav Kobozev commented

2020-06-08 15:46:57 +02:00

If I add normal edit modifier even without autosmooth, it fixes normals.
It is strange too,

If I add normal edit modifier even without autosmooth, it fixes normals. It is strange too, ![42085044.png](https://archive.blender.org/developer/F8601958/42085044.png) ![42095344.png](https://archive.blender.org/developer/F8601957/42095344.png)

Jeroen Bakker commented

2020-06-08 15:53:42 +02:00

Added subscriber: @Jeroen-Bakker

Jeroen Bakker commented

2020-06-08 16:24:41 +02:00

deaff945d0 is first bad commit

deaff945d0 is first bad commit

Julian Mohr commented

2020-06-08 16:25:55 +02:00

its quite interresting some objects will displayed normal some not.

Dalai Felinto commented

2020-06-08 16:30:38 +02:00

Added subscriber: @ideasman42

Why lol commented

2020-06-19 20:57:40 +02:00

Added subscriber: @Udjanii

Why lol commented

2020-06-19 20:57:40 +02:00

I am having the same problem, everything works fine on 2.83, but on 2.9 the shading in edit mode is broken, even for older projects.

Windows 10, and latest nvidia drivers.

Edit mode with auto smooth set to 180, and edit mode without auto smooth.

brokenshading.zip

I am having the same problem, everything works fine on 2.83, but on 2.9 the shading in edit mode is broken, even for older projects. Windows 10, and latest nvidia drivers. Edit mode with auto smooth set to 180, and edit mode without auto smooth. ![Screenshot_3.jpg](https://archive.blender.org/developer/F8632434/Screenshot_3.jpg) [brokenshading.zip](https://archive.blender.org/developer/F8632433/brokenshading.zip)

Chingiz Jumagulov commented

2020-06-20 18:03:23 +02:00

Added subscriber: @MeshVoid

Chingiz Jumagulov commented

2020-06-20 18:03:23 +02:00

Hi! I have the same weird shading behavior with ALL my mesh in Blender 2.90 since the very first alpha versions. (Running Windows 10, 64 bits, GPU: Geforce 1080, Geforce 1070, 32 gb ram)

Here's a screenshot of mesh looking weird with sub-d modifier turned off:

Now, I've turned it on and went to edit mode:

Notice changes. Weirdly if I set auto-smooth settings and ramp it up to something like 180 degrees it will smooth shade the object correctly. This has something to do with smooth shading. It is completely broken in 2.90 and I have observed this problem since the very first version of 2.90.

Here's the video of the bug:
2020-06-20 21-48-02.mp4

This has to be an issue with smooth shading in 2.90. All mesh objects are affected even the ones that were created solely in 2.90 version, so it's not a matter of corrupted files.

P.S. latest version of Blender is used:

UPDATE:

In material mode this weird shading bug looks like this:

Hi! I have the same weird shading behavior with ALL my mesh in Blender 2.90 since the very first alpha versions. (Running Windows 10, 64 bits, GPU: Geforce 1080, Geforce 1070, 32 gb ram) Here's a screenshot of mesh looking weird with sub-d modifier turned off: ![image.png](https://archive.blender.org/developer/F8633888/image.png) Now, I've turned it on and went to edit mode: ![image.png](https://archive.blender.org/developer/F8633893/image.png) Notice changes. Weirdly if I set auto-smooth settings and ramp it up to something like 180 degrees it will smooth shade the object correctly. This has something to do with smooth shading. It is completely broken in 2.90 and I have observed this problem since the very first version of 2.90. Here's the video of the bug: [2020-06-20 21-48-02.mp4](https://archive.blender.org/developer/F8633922/2020-06-20_21-48-02.mp4) This has to be an issue with **smooth shading** in 2.90. All mesh objects are affected even the ones that were created solely in 2.90 version, so it's not a matter of corrupted files. P.S. latest version of Blender is used: ![image.png](https://archive.blender.org/developer/F8633905/image.png) UPDATE: In material mode this weird shading bug looks like this: ![image.png](https://archive.blender.org/developer/F8633949/image.png)

Vyacheslav Kobozev commented

2020-06-21 19:34:37 +02:00

Temporary workaround: enable autosmooth with 180° for full smooth.