EEVEE: GPU Subdivision causes noticeable shading differences #109890

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opened 2023-07-10 05:22:40 +02:00 by sentharn · 6 comments

sentharn commented

2023-07-10 05:22:40 +02:00

System Information: System 1
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: Intel(R) Arc(TM) A770 Graphics Intel 4.5.0 - Build 31.0.101.4369

System Information: System 2
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.79

Short description of error
This object does not appear shinier/with brighter highlights when rendered on Eevee and GPU subdivision is turned OFF.

I noticed this when using both PCs to render an animation faster, this particular material flickered at random and it was because one PC was outputting slightly different results than the other.

Exact steps for others to reproduce the error

Open .blend file
select EEVEE engine and start viewport render
toggle GPU subdivision to notice the difference

**System Information: System 1** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: Intel(R) Arc(TM) A770 Graphics Intel 4.5.0 - Build 31.0.101.4369 **System Information: System 2** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.79 **Short description of error** This object does not appear shinier/with brighter highlights when rendered on Eevee and GPU subdivision is turned OFF. I noticed this when using both PCs to render an animation faster, this particular material flickered at random and it was because one PC was outputting slightly different results than the other. **Exact steps for others to reproduce the error** - Open .blend file - select EEVEE engine and start viewport render - toggle GPU subdivision to notice the difference

repro1.blend

132 KiB

normal_bug_intel.jpg

15 KiB

normal_bug_nvidia.jpg

16 KiB

sentharn added the

labels 2023-07-10 05:22:40 +02:00

sentharn commented

2023-07-10 06:32:51 +02:00

Author

Result from another user's AMD RX 580 appears to match the Intel A770 result

Result from another user's AMD RX 580 appears to match the Intel A770 result

normal_bug_amd.jpg

12 KiB

YimingWu added the

EEVEE & Viewport

label 2023-07-10 10:51:18 +02:00

Pratik Borhade commented

2023-07-11 05:22:52 +02:00

Member

I get consistent render results with AMD and NVIDIA devices: image

**System Information**
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: AMD Radeon(TM) Graphics ATI Technologies Inc. 4.5.14802 Core Profile Context 21.40.26 30.0.14026.1

I get consistent render results with AMD and NVIDIA devices: [image](/attachments/9f201e53-345d-4c1f-90fc-7f1031519de1) ``` **System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: AMD Radeon(TM) Graphics ATI Technologies Inc. 4.5.14802 Core Profile Context 21.40.26 30.0.14026.1 ```

250 KiB

250 KiB

sentharn commented

2023-07-11 07:44:45 +02:00

Author

You're right, my bad--a factory setup shows consistent rendering. What's strange is that the normals appear to be different even in the viewport solid view. I'm not sure what would change that. I will investigate more tomorrow and close the bug report soon.

You're right, my bad--a factory setup shows consistent rendering. What's strange is that the normals appear to be different even in the viewport solid view. I'm not sure what would change that. I will investigate more tomorrow and close the bug report soon.

sentharn commented

2023-07-11 07:52:14 +02:00

Author

@PratikPB2123 can you please try again but with GPU Subdivision toggled to its opposite state? (Preferences -> Viewport)

This changes the result in the render as well, for me, on both Intel and NVidia platforms.

Is this a known issue? I wasn't expecting such a dramatic change.

@PratikPB2123 can you please try again but with GPU Subdivision toggled to its opposite state? (Preferences -> Viewport) This changes the result in the render as well, for me, on both Intel and NVidia platforms. Is this a known issue? I wasn't expecting such a dramatic change.

sentharn changed title from ~~Eevee Shading difference between Intel and NVidia~~ to GPU Subdivision causes noticible shading differences (was Eevee Shading Differences)

2023-07-11 07:54:22 +02:00

Pratik Borhade commented

2023-07-11 09:04:51 +02:00

Member

Right. Toggling "GPU subdivision" indeed made the difference in EEVEE render.

Is this a known issue?

Not sure, need to check this.

Right. Toggling "GPU subdivision" indeed made the difference in EEVEE render. > Is this a known issue? Not sure, need to check this.

Pratik Borhade commented

2023-07-11 09:15:44 +02:00

Member

As far as I understand, results are incorrect when GPU subdivision is enabled.
Brighter surface is expected because material is partially specular and it also has high influence of area light Area.009
Confirming.

As far as I understand, results are incorrect when GPU subdivision is enabled. Brighter surface is expected because material is partially specular and it also has high influence of area light `Area.009` Confirming.

Pratik Borhade added

EEVEE & Viewport

and removed

labels 2023-07-11 09:16:33 +02:00

Pratik Borhade changed title from ~~GPU Subdivision causes noticible shading differences (was Eevee Shading Differences)~~ to EEVEE: GPU Subdivision causes noticeable shading differences

2023-07-11 09:17:26 +02:00

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Reference: blender/blender#109890

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