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Maniphest T82487

Ngons make random glitch in multires
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Description

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: rB3e85bb34d0d7
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.

Related Objects

Event Timeline

Mobin (Weekend) created this task.Nov 7 2020, 3:54 PM
Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Nov 9 2020, 4:03 PM
Philipp Oeser (lichtwerk) added projects: Modeling, Modifiers.
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

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

Mobin (Weekend) added a comment.Nov 9 2020, 7:30 PM

I manage to reproduce it on another model:

Ngon-Error01.blend2 MBDownload

  1. make a model with an ngon
  2. do multires and go high like 4-5 levels
  3. on multires, do change on ngon, apply base
  4. on multires, go lower do changes on ngon, apply base
  5. go back higher, see your mesh glitch out.
Philipp Oeser (lichtwerk) changed the task status from Needs Information from User to Needs Triage.Nov 18 2020, 6:27 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).Nov 19 2020, 7:35 PM

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 (Weekend) added a comment.Nov 19 2020, 9:11 PM

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:

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

Germano Cavalcante (mano-wii) closed this task as Resolved.Nov 20 2020, 3:59 PM
Germano Cavalcante (mano-wii) claimed this task.

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 (Weekend) added a comment.EditedNov 20 2020, 7:02 PM

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



even did factory reset on it with same results.

YAFU (YAFU) added a subscriber: YAFU (YAFU).Nov 20 2020, 8:22 PM

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 (mano-wii) reopened this task as Needs Triage.Nov 21 2020, 1:17 AM
Germano Cavalcante (mano-wii) removed Germano Cavalcante (mano-wii) as the assignee of this task.
Germano Cavalcante (mano-wii) added a comment.Nov 21 2020, 1:21 AM

Thanks for the info @YAFU (YAFU)
Apparently it is a duplicate of the T77261
Strange that I can't reproduce the problem on master.
I will investigate a little more later.

Germano Cavalcante (mano-wii) closed this task as a duplicate of T77261: Multiresolution modifier creates spikes when subdividing ngon meshes. .Nov 21 2020, 1:21 AM