Cycles: Wrong Motion Blur With GPU Using Optix API #120256

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opened 2024-04-04 15:35:45 +02:00 by Roland-Vyens · 20 comments

Roland-Vyens commented

2024-04-04 15:35:45 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.86

Blender Version
Broken: version: 4.1.0, branch: blender-v4.1-release, commit date: 2024-03-25 20:42, hash: 40a5e739e270
Worked: (newest version of Blender that worked as expected)

Short description of error
Motion blur is wrong, things in front of the camera became translucent (notice locations just behind the wheel arch and the front door seam. But if you use CUDA or CPU, motion blur works correctly.

wrong motion blur with optix GPU	right motion blur with CUDA GPU or CPU

Exact steps for others to reproduce the error
Use a Nvidia RTX card with Optix API to render this file.

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.86 **Blender Version** Broken: version: 4.1.0, branch: blender-v4.1-release, commit date: 2024-03-25 20:42, hash: `40a5e739e270` Worked: (newest version of Blender that worked as expected) **Short description of error** Motion blur is wrong, things in front of the camera became translucent (notice locations just behind the wheel arch and the front door seam. But if you use CUDA or CPU, motion blur works correctly. | wrong motion blur with optix GPU | right motion blur with CUDA GPU or CPU | |---|---| | ![屏幕截图 2024-04-04 211229.png](/attachments/563ec9d6-6d84-4557-9acc-42338e48669c) | ![屏幕截图 2024-04-04 211258.png](/attachments/d07f2452-9950-4051-b0d8-d495867b26ec) | **Exact steps for others to reproduce the error** Use a Nvidia RTX card with Optix API to render this file.

屏幕截图 2024-04-04 211258.png

1.1 MiB

problematic motion blur.blend

296 MiB

屏幕截图 2024-04-04 211229.png

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Roland-Vyens added the

labels 2024-04-04 15:35:45 +02:00

Roland-Vyens changed title from ~~Wrong Motion Blur With GPU Using Optix API~~ to Cycles: Wrong Motion Blur With GPU Using Optix API

2024-04-04 19:42:01 +02:00

YimingWu added the

Render & Cycles

label 2024-04-05 06:30:15 +02:00

Alaska commented

2024-04-05 09:57:48 +02:00

Member

I can confirm this issue with a RTX 4090 on Windows in Blender 4.1.

I'm pretty sure this issue has been present for a while, but I can't find the older bug report for this.

I can confirm this issue with a RTX 4090 on Windows in Blender 4.1. I'm pretty sure this issue has been present for a while, but I can't find the older bug report for this.

Alaska added

Render & Cycles

and removed

labels 2024-04-05 09:58:07 +02:00

Roland-Vyens commented

2024-04-05 15:33:41 +02:00

Author

I can confirm this issue with a RTX 4090 on Windows in Blender 4.1.

I'm pretty sure this issue has been present for a while, but I can't find the older bug report for this.

I wouldn't notice it without those fancy ornate textures lmao

> I can confirm this issue with a RTX 4090 on Windows in Blender 4.1. > > I'm pretty sure this issue has been present for a while, but I can't find the older bug report for this. I wouldn't notice it without those fancy ornate textures lmao

Jaakan-Shorter commented

2024-04-07 21:38:24 +02:00

I was just curious to see what would happen on Intel Arc.

Looks like its correct with oneAPI.
I tried your default settings and with GPU denoiser box checked.
ARC A750 + Blender 4.1 + Ubuntu 23 x64 + Intel's newest linux drivers as of today.

I was just curious to see what would happen on Intel Arc. Looks like its correct with oneAPI. I tried your default settings and with GPU denoiser box checked. ARC A750 + Blender 4.1 + Ubuntu 23 x64 + Intel's newest linux drivers as of today.

problematic motion blur_A750_linux_CPU denoise.png

1.4 MiB

problematic motion blur_A750_linux_GPU denoise.png

1.4 MiB

problematic motion blur_A750_linux_CPU denoise.png

problematic motion blur_A750_linux_GPU denoise.png

Andrej-Timotic commented

2024-04-15 04:03:09 +02:00

I am facing the same problem with different files of my own, really seems apparent with vehicles i guess lol

As OP said, when using CPU or CUDA, the issue doesn't appear. No troubleshooting helped.
Both Blender 4.0.2 and Blender 4.1 show this issue

Note to my screenshots, one is with Motion Blur on, other is off.

I am facing the same problem with different files of my own, really seems apparent with vehicles i guess lol As OP said, when using CPU or CUDA, the issue doesn't appear. No troubleshooting helped. Both Blender 4.0.2 and Blender 4.1 show this issue Note to my screenshots, one is with Motion Blur on, other is off.

Motion BLur off.jpg

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Motion BLur on.jpg

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Motion BLur off.jpg

Motion BLur on.jpg

Alaska commented

2024-04-15 04:06:05 +02:00

Member

CC @pmoursnv do you have time to take a look at this?

CC @pmoursnv do you have time to take a look at this?

Roland-Vyens commented

2024-04-15 12:29:50 +02:00

Author

I am facing the same problem with different files of my own, really seems apparent with vehicles i guess lol

As OP said, when using CPU or CUDA, the issue doesn't appear. No troubleshooting helped.
Both Blender 4.0.2 and Blender 4.1 show this issue

Note to my screenshots, one is with Motion Blur on, other is off.

Very strange lol. Are you using rigacar for car rig?

> I am facing the same problem with different files of my own, really seems apparent with vehicles i guess lol > > As OP said, when using CPU or CUDA, the issue doesn't appear. No troubleshooting helped. > Both Blender 4.0.2 and Blender 4.1 show this issue > > Note to my screenshots, one is with Motion Blur on, other is off. Very strange lol. Are you using rigacar for car rig?

Andrej-Timotic commented

2024-04-15 14:11:25 +02:00

Very strange lol. Are you using rigacar for car rig?

Yes! Did you?

I tried replicating the issue using Rigacar Addon with very simple geometry ( 1 big box and 4 small boxes as wheels) but i couldn't replicate it so far-

I thought might be some funky stuff happening due to the Objects being parented to Bones going through multiple levels of constraints?

> Very strange lol. Are you using rigacar for car rig? Yes! Did you? I tried replicating the issue using Rigacar Addon with very simple geometry ( 1 big box and 4 small boxes as wheels) but i couldn't replicate it so far- I thought might be some funky stuff happening due to the Objects being parented to Bones going through multiple levels of constraints?

Roland-Vyens commented

2024-04-15 15:45:22 +02:00

Author

I thought might be some funky stuff happening due to the Objects being parented to Bones going through multiple levels of constraints?

I'm using rigacar for this paticular car, but I don't think it's because this addon or multiple levels of parenting. Beacuse I also tested with all objects anim baked in visual keying and clear parenting/constraints.

> I thought might be some funky stuff happening due to the Objects being parented to Bones going through multiple levels of constraints? I'm using rigacar for this paticular car, but I don't think it's because this addon or multiple levels of parenting. Beacuse I also tested with all objects anim baked in visual keying and clear parenting/constraints.

Andrej-Timotic commented

2024-04-15 18:15:24 +02:00

I'm using rigacar for this paticular car, but I don't think it's because this addon or multiple levels of parenting. Beacuse I also tested with all objects anim baked in visual keying and clear parenting/constraints.

Ok thank you for your effort!

unfortunately i fear slower rendering with Cuda is the only solution at the moment

> I'm using rigacar for this paticular car, but I don't think it's because this addon or multiple levels of parenting. Beacuse I also tested with all objects anim baked in visual keying and clear parenting/constraints. Ok thank you for your effort! unfortunately i fear slower rendering with Cuda is the only solution at the moment

Roland-Vyens commented

2024-04-16 04:14:07 +02:00

Author

unfortunately i fear slower rendering with Cuda is the only solution at the moment

Yes the only method now is rendering with cuda. But for my scene, blender will crash after 10 - 30 frames rendered out using cuda. I have to constantly re-render manually, which is annoying

> unfortunately i fear slower rendering with Cuda is the only solution at the moment Yes the only method now is rendering with cuda. But for my scene, blender will crash after 10 - 30 frames rendered out using cuda. I have to constantly re-render manually, which is annoying

Alaska commented

2024-04-16 05:05:05 +02:00

Member

But for my scene, blender will crash after 10 - 30 frames rendered out using cuda. I have to constantly re-render manually, which is annoying

Please create a seperate bug report for this issue.

> But for my scene, blender will crash after 10 - 30 frames rendered out using cuda. I have to constantly re-render manually, which is annoying Please create a seperate bug report for this issue.

Roland-Vyens commented

2024-04-16 06:29:19 +02:00

Author

Please create a seperate bug report for this issue.

I have no idea whether it is a bug or gpu memory or something else, it's hard to recreate this issue, I need to do more test someday.

> Please create a seperate bug report for this issue. I have no idea whether it is a bug or gpu memory or something else, it's hard to recreate this issue, I need to do more test someday.

Patrick Mours commented

2024-04-18 16:17:07 +02:00

Member

This is a driver bug unfortunately, a fix is in the works. Will notify when an updated driver is released.

This is a driver bug unfortunately, a fix is in the works. Will notify when an updated driver is released.

Andrej-Timotic commented

2024-04-19 17:18:10 +02:00

This is a driver bug unfortunately, a fix is in the works. Will notify when an updated driver is released.

Thank you for the info Patrick!

Just for my understanding- is it coupled with the current Nvidia Studio/Game Driver?

Switching to an older version could fix this issue?

> This is a driver bug unfortunately, a fix is in the works. Will notify when an updated driver is released. Thank you for the info Patrick! Just for my understanding- is it coupled with the current Nvidia Studio/Game Driver? Switching to an older version could fix this issue?

Patrick Mours commented

2024-04-19 19:12:27 +02:00

Member

Drivers pre-r550 are likely unaffected, yes, I didn't verify this though.

Drivers pre-r550 are likely unaffected, yes, I didn't verify this though.

Andrej-Timotic commented

2024-04-20 11:40:02 +02:00

Drivers pre-r550 are likely unaffected, yes, I didn't verify this though.

I will try and report my results today!

> Drivers pre-r550 are likely unaffected, yes, I didn't verify this though. I will try and report my results today!

Andrej-Timotic commented

2024-04-20 14:36:59 +02:00

With my test scene visible in the first comment i made, i experience the glitch with every Studio Driver after (including) 551.23

546.33 rendering with Optix did not show the issue

I didn't do extensive testing though, only 2 frames per run.

With my test scene visible in the first comment i made, i experience the glitch with every Studio Driver after (including) 551.23 546.33 rendering with Optix did not show the issue I didn't do extensive testing though, only 2 frames per run.

Roland-Vyens commented

2024-04-20 15:53:25 +02:00

Author

With my test scene visible in the first comment i made, i experience the glitch with every Studio Driver after (including) 551.23

546.33 rendering with Optix did not show the issue

I didn't do extensive testing though, only 2 frames per run.

So this is a brand new bug lol

> With my test scene visible in the first comment i made, i experience the glitch with every Studio Driver after (including) 551.23 > > 546.33 rendering with Optix did not show the issue > > > I didn't do extensive testing though, only 2 frames per run. So this is a brand new bug lol

Andrej-Timotic commented

2024-04-23 16:17:56 +02:00

With my test scene visible in the first comment i made, i experience the glitch with every Studio Driver after (including) 551.23

546.33 rendering with Optix did not show the issue

I didn't do extensive testing though, only 2 frames per run.

So this is a brand new bug lol

I will try working on a personal animation again with the old driver and report how it went.

I am actually surprised, because i rendered out 2 or 3 animations with the currently "faulty" drivers, but havent noticed continuous artefacts, except for a frame here and there maybe.

But all of the sudden, nut much after you made your Original Post, it became all the more apparent over different files of mine. Also it looks like only some Objects are affected by it, as i couldn't recreate the bug with simple primitives.

> > With my test scene visible in the first comment i made, i experience the glitch with every Studio Driver after (including) 551.23 > > > > 546.33 rendering with Optix did not show the issue > > > > > > I didn't do extensive testing though, only 2 frames per run. > > So this is a brand new bug lol I will try working on a personal animation again with the old driver and report how it went. I am actually surprised, because i rendered out 2 or 3 animations with the currently "faulty" drivers, but havent noticed continuous artefacts, except for a frame here and there maybe. But all of the sudden, nut much after you made your Original Post, it became all the more apparent over different files of mine. Also it looks like only some Objects are affected by it, as i couldn't recreate the bug with simple primitives.

Andrej-Timotic commented

2024-05-02 15:46:12 +02:00

Its been over a week since installing Studio Driver 546.33 and i havent encounterd this issue once.

Its been over a week since installing Studio Driver 546.33 and i havent encounterd this issue once.

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