Maniphest T81497

Multiresolution creates strange geometry
Needs Information from Developers, Normal
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Assigned To
Richard Antalik (ISS)
Authored By
ohao (oha2)
Oct 7 2020, 1:40 AM
Tags
  • BF Blender
  • Sculpt, Paint & Texture
Subscribers
ohao (oha2)
Pablo Dobarro (pablodp606)
Pratik Borhade (PratikPB2123)
Richard Antalik (ISS)

Description

Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.67

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)

I applied a multiresolution modifier on this mesh, and it adds geometry that I didn't sculpt on the mesh (bumps, cracks...). It isn't always symmetric, as it happened even after I made more progress in my project. Deleting a face of the mesh and recreating it is enough to generate more of that random geometry. I don't know how to reproduce the problem. Removing and reapplying the multiresolution modifier works, but all the other sculpting is lost.

multiresolution.rar527 KBDownload

multires_problem.blend766 KBDownload

Related Objects

Event Timeline

ohao (oha2) created this task.Oct 7 2020, 1:40 AM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Oct 9 2020, 2:09 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Can't reproduce this problem. PLease check if this happens with build from https://builder.blender.org/download/

This may be related to T76842.

ohao (oha2) added a comment.Oct 10 2020, 1:23 PM

Hello, thank you for your interest.
I have observed this problem with Blender 2.79, 2.83 and 2.90 and 2.91.

I think I found a way to reproduce the problem:
-remove one or many faces of a mesh to create a hole.
-Apply a multiresolution modifier.
-Edit the mesh, and sculpt it.
-in edit mode, extrude the hole/create bridge loop with the same number of vertex.

In this case, you can see some part of the sculpting above is "transmitted", but in some cases it looks completely random, like this:

Richard Antalik (ISS) closed this task as Resolved.Oct 12 2020, 3:16 PM
Richard Antalik (ISS) claimed this task.
Richard Antalik (ISS) added a project: Sculpt, Paint & Texture.
Richard Antalik (ISS) added a subscriber: Pablo Dobarro (pablodp606).

I can reproduce similar effect, perhaps not that bad as you show in video, but I am not sure if this is bug or limitation really. @Pablo Dobarro (pablodp606) are glitches like these expected?

Richard Antalik (ISS) reopened this task as Needs Triage.Oct 12 2020, 3:17 PM

Oops, didn't want to close this

Pratik Borhade (PratikPB2123) changed the task status from Needs Triage to Needs Information from Developers.Jun 11 2021, 8:14 AM
Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).

Can repro for 2.93.0LTS. Unintended behavior may be?

but I am not sure if this is bug or limitation really. @Pablo Dobarro (pablodp606) are glitches like these expected?

In that case, marking this as Needs Information from Developers