Export obj: shading artifacts in EEVEE #97588

New Issue

zheng ying · 2022-04-24T10:18:09+02:00

zheng ying commented

2022-04-24 10:18:09 +02:00

System Information
Operating system: macOS v12.3.1 / windows 10
Graphics card: Intel

Blender Version
2.9.3

Short description of error

First , I import gltf file from up .zip file
Adjust point light as shown in the images
After, I export as obj file, then I import this obj file, it shows like this :

gltf	obj

The point light in the screen at the same place. but the render result it's different.
When related to translucence material , it have this problem. I test original blender file export obj, have the same problem.

.blend file with all steps included (but light type is Sun)
#97588.blend
glasses3.zip

**System Information** Operating system: macOS v12.3.1 / windows 10 Graphics card: Intel **Blender Version** 2.9.3 **Short description of error** - First , I import gltf file from up .zip file - Adjust point light as shown in the images ![截屏2022-04-25 12.51.33.png](https://archive.blender.org/developer/F13026208/截屏2022-04-25_12.51.33.png) ![截屏2022-04-25 12.52.03.png](https://archive.blender.org/developer/F13026217/截屏2022-04-25_12.52.03.png) - After, I export as obj file, then I import this obj file, it shows like this : | gltf | obj | | -- | -- | | ![微信图片_20220424161218.png](https://archive.blender.org/developer/F13021425/微信图片_20220424161218.png) | ![微信图片_20220424161225.png](https://archive.blender.org/developer/F13021430/微信图片_20220424161225.png) | The point light in the screen at the same place. but the render result it's different. When related to translucence material , it have this problem. I test original blender file export obj, have the same problem. .blend file with all steps included (but light type is Sun) [#97588.blend](https://archive.blender.org/developer/F13028204/T97588.blend) [glasses3.zip](https://archive.blender.org/developer/F13021417/glasses3.zip)

zheng ying commented

2022-04-24 10:18:09 +02:00

Added subscriber: @wingdi

Aras Pranckevicius commented

2022-04-24 12:01:46 +02:00

Added subscriber: @aras_p

Pratik Borhade commented

2022-04-25 05:43:50 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-04-25 05:43:50 +02:00

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

Pratik Borhade commented

2022-04-25 05:43:50 +02:00

Thanks for the report. Tested with both old and new obj importer/exporter and it imported your object correctly
I did not get similar render output as yours.
Are you exporting/importing with default settings?
@aras_p , are you able to reproduce this?

3.2.0	2.93

Graphics card : AMD Radeon(TM) 535 ATI Technologies .```

Thanks for the report. Tested with both old and new obj importer/exporter and it imported your object correctly I did not get similar render output as yours. Are you exporting/importing with default settings? @aras_p , are you able to reproduce this? | 3.2.0 | 2.93 | | -- | -- | | ![image.png](https://archive.blender.org/developer/F13024240/image.png) | ![image.png](https://archive.blender.org/developer/F13024243/image.png) | ```Operating system : Windows-10-10.0.18362-SP0 64 Bits Graphics card : AMD Radeon(TM) 535 ATI Technologies .```

zheng ying commented

2022-04-25 07:01:58 +02:00

Ok .
After import the obj file, because it's too small, so i zoom in it 5 times.
Then i add a point light , this the point light's position(light position is important):

Ok . After import the obj file, because it's too small, so i zoom in it 5 times. Then i add a point light , this the point light's position(light position is important): ![截屏2022-04-25 12.51.33.png](https://archive.blender.org/developer/F13024364/截屏2022-04-25_12.51.33.png) ![截屏2022-04-25 12.52.03.png](https://archive.blender.org/developer/F13024366/截屏2022-04-25_12.52.03.png)

Aras Pranckevicius commented

2022-04-25 12:56:20 +02:00

I can't reproduce the issue of "broken, polygons visible" shading on the glasses. Tried with Blender 3.0, 3.1 and 3.2, everything looks fine.

After exporting and importing the obj file it does look different than after importing from glTF2, but that's because the obj file material model is much more limited and not all the things (related to transparency etc.) export/import in the same way. But still, no "broken shading" artifacts for me like in your images.

I can't reproduce the issue of "broken, polygons visible" shading on the glasses. Tried with Blender 3.0, 3.1 and 3.2, everything looks fine. After exporting and importing the obj file it does look different than after importing from glTF2, but that's because the obj file material model is much more limited and not all the things (related to transparency etc.) export/import in the same way. But still, no "broken shading" artifacts for me like in your images.

zheng ying commented

2022-04-25 19:51:07 +02:00

I reinstall blender-3.1.2 (windows 10 / GPU Nvidia RTX 2060) and test it again.
if you zoom in obj model 5 times, and put a point light at the position like this :

I am pretty sure you can reproduce it, man.

I reinstall blender-3.1.2 (windows 10 / GPU Nvidia RTX 2060) and test it again. if you zoom in obj model 5 times, and put a point light at the position like this : ![截屏2022-04-25 12.51.33.png](https://archive.blender.org/developer/F13026208/截屏2022-04-25_12.51.33.png) ![截屏2022-04-25 12.52.03.png](https://archive.blender.org/developer/F13026217/截屏2022-04-25_12.52.03.png) I am pretty sure you can reproduce it, man.

zheng ying commented

2022-04-25 20:53:20 +02:00

If use Cycles render engine don't have this problem. use Eevee have . And when i test it using myself software which using openGL also have this problem.

Pratik Borhade commented

2022-04-26 04:54:59 +02:00

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

Pratik Borhade commented

2022-04-26 04:54:59 +02:00

I do see some shading artifacts when I switch light type to Sun.

#97588.blend

I do see some shading artifacts when I switch light type to Sun. ![image.png](https://archive.blender.org/developer/F13028207/image.png) [#97588.blend](https://archive.blender.org/developer/F13028204/T97588.blend)

Pratik Borhade changed title from ~~Export obj file problem.~~ to Export obj: shading artifacts in EEVEE

2022-04-26 05:06:08 +02:00

Philipp Oeser commented

2022-04-26 14:12:59 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-04-26 14:12:59 +02:00

Duplicate of #89630 (FBX/OBJ Import - Show Backfaces makes object look wrong and is ON by default.), will merge reports

Philipp Oeser commented

2022-04-26 14:13:07 +02:00

Closed as duplicate of #89630

Philipp Oeser closed this issue

2022-04-26 14:13:07 +02:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Export obj: shading artifacts in EEVEE #97588