Persistent data, motion blur, and geometry displacement results in glitchy meshes during rendering #89736

New Issue

adrenaline_hunter · 2021-07-08T15:08:53+02:00

adrenaline_hunter commented

2021-07-08 15:08:53 +02:00

System Information:
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version:
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: 1b8d33b18c
Worked: N/A

Short description of error:
I don't know if this is a bug or a limitation, when rendering with Cycles with Persistent Data and Motion Blur are enabled and there is an object with Displacement, the mesh will start to glitch. I tried also with a fixed camera and the result is the same.

`Persistent Data` off	`Persistent Data` on
A0001-0050.mp4	0001-0050.mp4

persistent data test.blend

Exact steps for others to reproduce the error:
open the attached .blend file and render the animation

or

Create a new file.
Change the render engine to Cycles and enable Motion Blur and the Persistent Data option.
Create an object and give it a material, making sure you change the Displacement method for this material to Displacement Only
In that material, attach something to the Displacement output of the node tree. A noise texture works.
Ensure the object with the material created in the precious steps has enough geometry for the displacement to be noticeable.
Render an animation with this setup and observe the mesh changing as the animation progresses, this should not be happened.

**System Information:** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92 **Blender Version:** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `1b8d33b18c` Worked: N/A **Short description of error:** I don't know if this is a bug or a limitation, when rendering with Cycles with `Persistent Data` and `Motion Blur` are enabled and there is an object with `Displacement`, the mesh will start to glitch. I tried also with a fixed camera and the result is the same. | `Persistent Data` off | `Persistent Data` on | | -- | -- | |[A0001-0050.mp4](https://archive.blender.org/developer/F10217138/A0001-0050.mp4)|[0001-0050.mp4](https://archive.blender.org/developer/F10217141/0001-0050.mp4)| [persistent data test.blend](https://archive.blender.org/developer/F10217149/persistent_data_test.blend) **Exact steps for others to reproduce the error:** open the attached .blend file and render the animation or 1. Create a new file. 2. Change the render engine to Cycles and enable `Motion Blur` and the `Persistent Data` option. 3. Create an object and give it a material, making sure you change the `Displacement` method for this material to `Displacement Only` 4. In that material, attach something to the `Displacement` output of the node tree. A noise texture works. 5. Ensure the object with the material created in the precious steps has enough geometry for the displacement to be noticeable. 6. Render an animation with this setup and observe the mesh changing as the animation progresses, this should not be happened.

adrenaline_hunter commented

2021-07-08 15:08:53 +02:00

Added subscriber: @adrenaline_hunter

blender-admin commented

2021-07-08 15:08:53 +02:00

#89966 was marked as duplicate of this issue

Alaska commented

2021-07-09 00:58:24 +02:00

Added subscriber: @Alaska

Alaska commented

2021-07-09 00:58:24 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Alaska commented

2021-07-09 00:58:24 +02:00

I can confirm this issue, information can be found below:

I believe I saw a report similar to this one but I can't find it at the moment.

System Information
Operating system: Linux-5.10.0-7-amd64-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.31

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-08 17:54, hash: af8fb707da

I can confirm this issue, information can be found below: I believe I saw a report similar to this one but I can't find it at the moment. **System Information** Operating system: Linux-5.10.0-7-amd64-x86_64-with-glibc2.31 64 Bits Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.31 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-08 17:54, hash: `af8fb707da`

Pratik Borhade commented

2021-07-09 06:26:42 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-07-09 06:26:42 +02:00

I believe I saw a report similar to this one but I can't find it at the moment.

May be #89396 (Environment Pass does not work with "Persistent Data" turned on) ?

>I believe I saw a report similar to this one but I can't find it at the moment. May be #89396 (Environment Pass does not work with "Persistent Data" turned on) ?

Alaska commented

2021-07-09 08:21:35 +02:00

I've looked into the issue further and found that this issue only occurs when persistent data, motion blur, and shader displacement is enabled.

I will update the report to reflect these conditions.

I've looked into the issue further and found that this issue only occurs when persistent data, motion blur, and shader displacement is enabled. I will update the report to reflect these conditions.

Alaska changed title from ~~mesh glitch when Adaptive Subdivision and Persistent Data are enabled~~ to Persistent data, motion blur, and geometry displacement results in glitchy meshes during rendering

2021-07-09 08:36:37 +02:00

adrenaline_hunter commented

2021-07-09 09:40:11 +02:00

In #89736#1188948, @Alaska wrote:
I've looked into the issue further and found that this issue only occurs when persistent data, motion blur, and shader displacement is enabled.

I will update the report to reflect these conditions.

thank you so much! I don't need motion blur in my project and this is a great workaround, now wait for a fix 😬

> In #89736#1188948, @Alaska wrote: > I've looked into the issue further and found that this issue only occurs when persistent data, motion blur, and shader displacement is enabled. > > I will update the report to reflect these conditions. thank you so much! I don't need motion blur in my project and this is a great workaround, now wait for a fix 😬

Alaska commented

2021-07-10 03:25:50 +02:00

Added subscriber: @brecht

Alaska commented

2021-07-10 03:25:50 +02:00

CC @brecht as this seems to be a area you have knowledge in.

HEYPictures commented

2021-07-10 08:06:12 +02:00

Added subscriber: @Florian-10

HEYPictures commented

2021-07-10 08:06:12 +02:00

can confirm had the same problem

HEYPictures commented

2021-07-10 12:11:35 +02:00

Also when you render with a given sample rate and you turn afterwords Persistant Data on and change the samples. It will render still the old setting for Samples.

Alaska commented

2021-07-11 01:38:08 +02:00

In #89736#1189542, @Florian-10 wrote:
Also when you render with a given sample rate and you turn afterwords Persistant Data on and change the samples. It will render still the old setting for Samples.

For separate bugs, please make a separate report

> In #89736#1189542, @Florian-10 wrote: > Also when you render with a given sample rate and you turn afterwords Persistant Data on and change the samples. It will render still the old setting for Samples. For separate bugs, please make a separate report

blender-admin commented

2021-07-12 15:56:31 +02:00

This issue was referenced by 283481643c

This issue was referenced by 283481643c56af813699bd5167b7b00430284310

blender-admin commented

2021-07-12 15:56:31 +02:00

This issue was referenced by f709f12d93

This issue was referenced by f709f12d93583d7e476077753241227eb4030954

Brecht Van Lommel commented

2021-07-12 15:58:21 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue