Multires: Artefacts from lower subdiv level changes #76374

New Issue

Frozen_Death_Knight · 2020-05-03T17:45:38+02:00

2020-05-03 17:45:38 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.50

Blender Version
Broken: version: 2.90 (sub 0), branch: master, commit date: 2020-04-30 20:00, hash: 03f4d20bcf

Short description of error
While I was testing MultiRes in 2.90, I found a bug when sculpting on lower subdiv levels which recently got activated. If you for instance smooth the sculpt at a lower subdiv level and save your sculpt while at any lower subdiv level that isn't the highest one, your sculpt will deform with artefacts. Here's a demonstration:

Desktop 2020.05.03 - 17.27.17.02.mp4

Exact steps for others to reproduce the error

Here's the file I was working on.
Urbosa Sculpt.blend

Here's what you need to do to reproduce:

Smooth an area with a lot of sharpness to it at the current subdiv level (it can be any level except 5 which is the highest one).
Save the project.
Artefacts should appear now. Change to other subdiv levels, including level 5 and repeat the save just to compared the results. The highest subdiv level should always work. An alternative way to not reproduce the bug is to smooth at a lower subdiv level and then go to the highest level available and save. Then the artefacts don't appear either.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.50 **Blender Version** Broken: version: 2.90 (sub 0), branch: master, commit date: 2020-04-30 20:00, hash: `03f4d20bcf` **Short description of error** While I was testing MultiRes in 2.90, I found a bug when sculpting on lower subdiv levels which recently got activated. If you for instance smooth the sculpt at a lower subdiv level and save your sculpt while at any lower subdiv level that isn't the highest one, your sculpt will deform with artefacts. Here's a demonstration: [Desktop 2020.05.03 - 17.27.17.02.mp4](https://archive.blender.org/developer/F8509480/Desktop_2020.05.03_-_17.27.17.02.mp4) **Exact steps for others to reproduce the error** Here's the file I was working on. [Urbosa Sculpt.blend](https://archive.blender.org/developer/F8509496/Urbosa_Sculpt.blend) Here's what you need to do to reproduce: 1) Smooth an area with a lot of sharpness to it at the current subdiv level (it can be any level except 5 which is the highest one). 2) Save the project. 3) Artefacts should appear now. Change to other subdiv levels, including level 5 and repeat the save just to compared the results. The highest subdiv level should always work. An alternative way to not reproduce the bug is to smooth at a lower subdiv level and then go to the highest level available and save. Then the artefacts don't appear either.

Frozen_Death_Knight commented

2020-05-03 17:45:38 +02:00

Added subscriber: @Frozen_Death_Knight

Erick Tukuniata commented

2020-05-03 18:19:55 +02:00

Added subscriber: @ErickNyanduKabongo

Erick Tukuniata commented

2020-05-03 18:19:55 +02:00

After following the instructions above i couldn't reproduce it. Everything runs smooth here. Please Try to load factory settings and check.

Frozen_Death_Knight commented

2020-05-03 18:37:45 +02:00

In #76374#923252, @ErickNyanduKabongo wrote:
After following the instructions above i couldn't reproduce it. Everything runs smooth here. Please Try to load factory settings and check.

Didn't make a difference. Still the same issue when I save with factory settings. Here's the file with factory settings loaded. Try to smooth around the eye socket and save to see for yourself.

Broken Save MultiRes Subdiv Levels.blend

Desktop 2020.05.03 - 18.36.17.03.mp4

> In #76374#923252, @ErickNyanduKabongo wrote: > After following the instructions above i couldn't reproduce it. Everything runs smooth here. Please Try to load factory settings and check. Didn't make a difference. Still the same issue when I save with factory settings. Here's the file with factory settings loaded. Try to smooth around the eye socket and save to see for yourself. [Broken Save MultiRes Subdiv Levels.blend](https://archive.blender.org/developer/F8509631/Broken_Save_MultiRes_Subdiv_Levels.blend) [Desktop 2020.05.03 - 18.36.17.03.mp4](https://archive.blender.org/developer/F8509672/Desktop_2020.05.03_-_18.36.17.03.mp4)

Erick Tukuniata commented

2020-05-03 19:15:35 +02:00

I can reproduce it now, what i had to do is to rotate the view.

Frozen_Death_Knight changed title from ~~Saving your sculpt while in a lower subdiv level with MultiRes causes mesh artefacts~~ to Saving your sculpt while on a lower subdiv level with MultiRes causes mesh artefacts

2020-05-03 22:37:30 +02:00

Germano Cavalcante commented

2020-05-04 16:56:00 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-05-04 16:56:00 +02:00

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

Germano Cavalcante commented

2020-05-04 16:56:00 +02:00

I cannot reproduce this with either the latest stable or current development versions of Blender.
But I did it differently from the video because I selected the Smooth tool first (does that make any difference)?

Please try the latest daily build: https://builder.blender.org/download/

Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue.
If the problem persists, please give us more clear instructions on how to reproduce it from scratch.

I cannot reproduce this with either the latest stable or current development versions of Blender. But I did it differently from the video because I selected the Smooth tool first (does that make any difference)? Please try the latest daily build: https://builder.blender.org/download/ - Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue. If the problem persists, please give us more clear instructions on how to reproduce it from scratch.

Germano Cavalcante commented

2020-05-14 15:43:03 +02:00

Added subscriber: @PabloDobarro

Germano Cavalcante commented

2020-05-14 15:43:03 +02:00

Since this report has been inactive for more than a week, it should be closed.
But I'm not sure if I'm doing something wrong in the steps to reproduce the problem.
@PabloDobarro, can you confirm?

Since this report has been inactive for more than a week, it should be closed. But I'm not sure if I'm doing something wrong in the steps to reproduce the problem. @PabloDobarro, can you confirm?

Erick Tukuniata commented

2020-05-17 15:56:29 +02:00

I tested it with today's master and the problem is still there.

Frozen_Death_Knight commented

2020-05-17 21:29:03 +02:00

@mano-wii As I have already said, nothing has changed since my original report. Yes, I already tried the Load Factory Settings approach, it still behaves the same way on that same model I uploaded here. Don't know what I can do to make you able to replicate it when I am able to replicate it on demand every time I save after smoothing an area with roughness details. The issue is strictly related to saving at a subdiv level lower than the maximum. If you smooth and then go to the maximum level and then save the issue will not appear.

The best explanation for this phenomenon that I can come up with is that making any change to a lower subdiv level makes MultiRes recalculate all the details on the levels above it when you go up in levels, since there is always some delay after sculpting on a subdiv level and moving to a level above it after doing lots of testing. When you save before moving to a higher level it doesn't seem to recalculate them correctly and MultiRes doesn't remember how to propagate the details correctly to those high res levels.

@mano-wii As I have already said, nothing has changed since my original report. Yes, I already tried the Load Factory Settings approach, it still behaves the same way on that same model I uploaded here. Don't know what I can do to make you able to replicate it when I am able to replicate it on demand every time I save after smoothing an area with roughness details. The issue is strictly related to saving at a subdiv level lower than the maximum. If you smooth and then go to the maximum level and then save the issue will not appear. The best explanation for this phenomenon that I can come up with is that making any change to a lower subdiv level makes MultiRes recalculate all the details on the levels above it when you go up in levels, since there is always some delay after sculpting on a subdiv level and moving to a level above it after doing lots of testing. When you save before moving to a higher level it doesn't seem to recalculate them correctly and MultiRes doesn't remember how to propagate the details correctly to those high res levels.

Germano Cavalcante commented

2020-05-27 16:12:49 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Richard Antalik commented

2020-11-26 19:46:46 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-11-26 19:46:46 +01:00

@ErickNyanduKabongo I am looking at older reports, is this still an issue? Or have anything changed?

Erick Tukuniata commented

2020-11-26 21:08:36 +01:00

In #76374#1062408, @iss wrote:
@ErickNyanduKabongo I am looking at older reports, is this still an issue? Or have anything changed?

I should set a reminder to check on this on Sunday when i have free time :)

> In #76374#1062408, @iss wrote: > @ErickNyanduKabongo I am looking at older reports, is this still an issue? Or have anything changed? I should set a reminder to check on this on Sunday when i have free time :)

Philipp Oeser removed the

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Multires: Artefacts from lower subdiv level changes #76374