Ngons make random glitch in multires #82487

New Issue

Mobin · 2020-11-07T15:54:36+01:00

Mobin commented

2020-11-07 15:54:36 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1660 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.09

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0
Worked: (newest version of Blender that worked as expected)

Short description of error
ngons make random glitch in multires modifier. I think it's because ngons change their hidden edge on some multires operations like apply base.

happens by random on apply base on meshes with Ngons on multires

I know I should avoid ngons but it would be good if the modifier print out a warning when you have Ngons. I totally forgot it on this model.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1660 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.09 **Blender Version** Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: `3e85bb34d0` Worked: (newest version of Blender that worked as expected) **Short description of error** ngons make random glitch in multires modifier. I think it's because ngons change their hidden edge on some multires operations like apply base. happens by random on apply base on meshes with Ngons on multires I know I should avoid ngons but it would be good if the modifier print out a warning when you have Ngons. I totally forgot it on this model. ![image.png](https://archive.blender.org/developer/F9228507/image.png)

Mobin commented

2020-11-07 15:54:36 +01:00

Added subscriber: @Mobin-2

Philipp Oeser commented

2020-11-09 16:03:21 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-11-09 16:03:21 +01:00

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

Philipp Oeser commented

2020-11-09 16:03:21 +01:00

Mind sharing the .blend so we have a chance to reproduce?

Mobin commented

2020-11-09 19:30:01 +01:00

I manage to reproduce it on another model:

Ngon-Error01.blend

make a model with an ngon
do multires and go high like 4-5 levels
on multires, do change on ngon, apply base
on multires, go lower do changes on ngon, apply base

go back higher, see your mesh glitch out.

I manage to reproduce it on another model: [Ngon-Error01.blend](https://archive.blender.org/developer/F9247164/Ngon-Error01.blend) - make a model with an ngon - do multires and go high like 4-5 levels - on multires, do change on ngon, apply base - on multires, go lower do changes on ngon, apply base # go back higher, see your mesh glitch out.

Philipp Oeser commented

2020-11-18 18:27:26 +01:00

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

Germano Cavalcante commented

2020-11-19 19:35:58 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-11-19 19:35:58 +01:00

I can see that the mesh has a problem, but I didn't understand what you meant by: "on multires, do change on ngon, apply base".
Do you do this in sculpt mode?

I tried to sculpt the mesh but I can't reproduce the problem.

I can see that the mesh has a problem, but I didn't understand what you meant by: "on multires, do change on ngon, apply base". Do you do this in sculpt mode? I tried to sculpt the mesh but I can't reproduce the problem.

Mobin commented

2020-11-19 21:11:17 +01:00

yeah just keep your focus on the area that ngone is and on sculpt mode make a change there and apply the change on base model (the button on multires)

update: ok here is another way I found just right now:

made a cylinder
gone in sculpt mode
pressed ctrl+4 for fast multires modifier
this happened!

yeah just keep your focus on the area that ngone is and on sculpt mode make a change there and apply the change on base model (the button on multires) update: ok here is another way I found just right now: - made a cylinder - gone in sculpt mode - pressed ctrl+4 for fast multires modifier - this happened! ![image.png](https://archive.blender.org/developer/F9329084/image.png)

Germano Cavalcante commented

2020-11-20 15:59:59 +01:00

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

Germano Cavalcante closed this issue

2020-11-20 15:59:59 +01:00

Germano Cavalcante self-assigned this 2020-11-20 15:59:59 +01:00

Germano Cavalcante commented

2020-11-20 15:59:59 +01:00

I reproduced this bug in the informed version, but not the latest daily build, so it appears the bug has been fixed already.

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

If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.

I reproduced this bug in the informed version, but not the latest daily build, so it appears the bug has been fixed already. Please try the latest daily build: https://builder.blender.org/download/ If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.

Mobin commented

2020-11-20 19:02:16 +01:00

Still broken in new alpha. 2.92.0 Alpha from today
did the cylinder test:

even did factory reset on it with same results.

Still broken in new alpha. 2.92.0 Alpha from today did the cylinder test: ![image.png](https://archive.blender.org/developer/F9339069/image.png) ![image.png](https://archive.blender.org/developer/F9339092/image.png) even did factory reset on it with same results.

YAFU commented

2020-11-20 20:22:25 +01:00

Added subscriber: @YAFU

YAFU commented

2020-11-20 20:22:25 +01:00

Hi.
Yes, it is still reproducible with Multires. You can use a cone or a cylinder as a base mesh.

Pablo Dobarro had already marked this entry as a known bug:
https://developer.blender.org/T77261

Hi. Yes, it is still reproducible with Multires. You can use a cone or a cylinder as a base mesh. Pablo Dobarro had already marked this entry as a known bug: https://developer.blender.org/T77261

Germano Cavalcante commented

2020-11-21 01:17:24 +01:00

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

Germano Cavalcante reopened this issue

2020-11-21 01:17:24 +01:00

Germano Cavalcante removed their assignment 2020-11-21 01:17:24 +01:00

Germano Cavalcante commented

2020-11-21 01:21:02 +01:00

Thanks for the info @YAFU
Apparently it is a duplicate of the #77261
Strange that I can't reproduce the problem on master.
I will investigate a little more later.

Thanks for the info @YAFU Apparently it is a duplicate of the #77261 Strange that I can't reproduce the problem on master. I will investigate a little more later.

Germano Cavalcante commented

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

Closed as duplicate of #77261

Germano Cavalcante closed this issue

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

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Ngons make random glitch in multires #82487

go back higher, see your mesh glitch out.