Different results between CPU and GPU with new Nishita Sky Texture #78324

New Issue

soulfire · 2020-06-26T19:31:37+02:00

soulfire commented

2020-06-26 19:31:37 +02:00

System Information
Operating system: Windows-10
Graphics card: GeForce GT 1030/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-25 21:53, hash: 62aa103d48
2020-06-26 17:24, hash: b7b57e7155

Short description of error
Rendering with sky texture give wrong output

Exact steps for others to reproduce the error
Based on the default startup cube with sky texture
GPU CUDA compute gt 1030

CPU compute

test.blend

**System Information** Operating system: Windows-10 Graphics card: GeForce GT 1030/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14 Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-25 21:53, hash: `62aa103d48` 2020-06-26 17:24, hash: `b7b57e7155` **Short description of error** Rendering with sky texture give wrong output **Exact steps for others to reproduce the error** Based on the default startup cube with sky texture GPU CUDA compute gt 1030 ![1221.jpg](https://archive.blender.org/developer/F8645752/1221.jpg) ![tea1.jpg](https://archive.blender.org/developer/F8646026/tea1.jpg) CPU compute ![1221 cpu compue.jpg](https://archive.blender.org/developer/F8645754/1221_cpu_compue.jpg) [test.blend](https://archive.blender.org/developer/F8646024/test.blend)

soulfire commented

2020-06-26 19:31:37 +02:00

Added subscriber: @TomG

soulfire changed title from ~~Sky texture glitched~~ to Sky texture glitched/Cycles

2020-06-26 19:32:02 +02:00

Marco commented

2020-06-29 19:20:41 +02:00

Added subscriber: @nacioss

Marco commented

2020-06-29 19:20:41 +02:00

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

Marco commented

2020-06-29 19:20:41 +02:00

Can't reproduce the issue, try to update the Nvidia drivers, do you get any issues with CPU rendering?

Can't reproduce the issue, try to update the Nvidia drivers, do you get any issues with CPU rendering? ![image.png](https://archive.blender.org/developer/F8653955/image.png)

soulfire commented

2020-06-29 20:18:39 +02:00

I updated the drivers. It's the same. CUDA is giving glitched output.

In todays build CPU rendering is OK. Only render with CUDA is glitched.

If I render with SKY LIGHT without Sky texture, rendering is fine.

I updated the drivers. It's the same. CUDA is giving glitched output. ![Capture.JPG](https://archive.blender.org/developer/F8654027/Capture.JPG) In todays build CPU rendering is OK. Only render with CUDA is glitched. If I render with SKY LIGHT without Sky texture, rendering is fine. ![Capture2.JPG](https://archive.blender.org/developer/F8654029/Capture2.JPG)

Marco commented

2020-06-29 20:24:38 +02:00

Does it happen with other scenes too? i mean, try without the sky, if the issue persists then the problem could be related to GPU rathen than the sky.

soulfire commented

2020-06-29 20:31:17 +02:00

In #78324#969285, @nacioss wrote:
Does it happen with other scenes too? i mean, try without the sky, if the issue persists then the problem could be related to GPU rathen than the sky.

I updated previous. With sky light without sky texture, CUDA rendering is fine.

Only sky texture with CUDA rendering is giving issues in every scene.

> In #78324#969285, @nacioss wrote: > Does it happen with other scenes too? i mean, try without the sky, if the issue persists then the problem could be related to GPU rathen than the sky. I updated previous. With sky light without sky texture, CUDA rendering is fine. Only `sky texture with CUDA` rendering is giving issues in every scene.

Marco commented

2020-06-29 20:46:05 +02:00

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

Marco commented

2020-06-29 20:46:05 +02:00

Ok, i can reproduce it now, it does only with CUDA + CPU, will dig in the code soon, thank you a lot for the report ;) .
Meanwhile, avoid using such low Sun Size values.
EDIT: Using values from 0.4 to above works well

Ok, i can reproduce it now, it does only with CUDA + CPU, will dig in the code soon, thank you a lot for the report ;) . Meanwhile, avoid using such low Sun Size values. EDIT: Using values from 0.4 to above works well

soulfire commented

2020-06-29 21:06:54 +02:00

In #78324#969304, @nacioss wrote:
Using values from 0.2 to above works well.

It's the same glitch only harder to detect. Zoom in and you'll see.

Sun size 0.2:

> In #78324#969304, @nacioss wrote: > Using values from 0.2 to above works well. It's the same glitch only harder to detect. Zoom in and you'll see. Sun size 0.2: ![sun size 0_2.jpg](https://archive.blender.org/developer/F8654076/sun_size_0_2.jpg)

blender-admin commented

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

This issue was referenced by blender/cycles@3a16a5a50b

This issue was referenced by blender/cycles@3a16a5a50baaa500ac434fbfc2da2d330a309aee

blender-admin commented

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

This issue was referenced by 7fcb6bc59c

This issue was referenced by 7fcb6bc59c85beab36dbfcec91d0cfaf5291f029

Lukas Stockner changed title from ~~Sky texture glitched/Cycles~~ to Different results between CPU and GPU with new Nishita Sky Texture

2020-07-08 02:11:04 +02:00

Lukas Stockner commented

2020-07-08 02:55:55 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Lukas Stockner closed this issue

2020-07-08 02:55:55 +02:00

Lukas Stockner self-assigned this 2020-07-08 02:55:55 +02:00

Lukas Stockner commented

2020-07-08 03:00:36 +02:00

In case anyone is curious about the difference the fix makes, here's a 0.1° sun at very high focal length:

CPU before:

GPU before:

Both after:

In case anyone is curious about the difference the fix makes, here's a 0.1° sun at very high focal length: CPU before: ![sun_before_fix.png](https://archive.blender.org/developer/F8677010/sun_before_fix.png) GPU before: ![sun_before_fix_gpu.png](https://archive.blender.org/developer/F8677012/sun_before_fix_gpu.png) Both after: ![sun_after_fix.png](https://archive.blender.org/developer/F8677014/sun_after_fix.png)

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Different results between CPU and GPU with new Nishita Sky Texture #78324