Multires: Editing base mesh creates random results on higher subdiv levels #81497

New Issue

ohao · 2020-10-07T01:40:14+02:00

ohao commented

2020-10-07 01:40:14 +02:00

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: 3e85bb34d0
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.rar
multires_problem.blend

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: `3e85bb34d0` 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.rar](https://archive.blender.org/developer/F8962918/multiresolution.rar) [multires_problem.blend](https://archive.blender.org/developer/F8962910/multires_problem.blend)

ohao commented

2020-10-07 01:40:14 +02:00

Added subscriber: @oha2

Richard Antalik commented

2020-10-09 14:09:03 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-10-09 14:09:03 +02:00

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

Richard Antalik commented

2020-10-09 14:09:03 +02:00

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

This may be related to #76842.

Can't reproduce this problem. PLease check if this happens with build from https://builder.blender.org/download/ This may be related to #76842.

ohao commented

2020-10-10 13:23:32 +02:00

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.
blender_multires.mp4

In this case, you can see some part of the sculpting above is "transmitted", but in some cases it looks completely random, like this: {F8974503}

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. [blender_multires.mp4](https://archive.blender.org/developer/F8974516/blender_multires.mp4) In this case, you can see some part of the sculpting above is "transmitted", but in some cases it looks completely random, like this: {[F8974503](https://archive.blender.org/developer/F8974503/multires_hand.PNG)}![multires_hand2.PNG](https://archive.blender.org/developer/F8974532/multires_hand2.PNG)

Richard Antalik commented

2020-10-12 15:16:46 +02:00

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

Richard Antalik closed this issue

2020-10-12 15:16:46 +02:00

Richard Antalik self-assigned this 2020-10-12 15:16:46 +02:00

Richard Antalik commented

2020-10-12 15:16:46 +02:00

Added subscriber: @PabloDobarro

Richard Antalik commented

2020-10-12 15:16:46 +02:00

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. @PabloDobarro are glitches like these expected?

Richard Antalik commented

2020-10-12 15:17:35 +02:00

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

Richard Antalik reopened this issue

2020-10-12 15:17:35 +02:00

Richard Antalik commented

2020-10-12 15:17:35 +02:00

Oops, didn't want to close this

Pratik Borhade commented

2021-06-11 08:14:34 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-06-11 08:14:34 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Pratik Borhade commented

2021-06-11 08:14:34 +02:00

Can repro for 2.93.0LTS. Unintended behavior may be?

but I am not sure if this is bug or limitation really. @PabloDobarro are glitches like these expected?

In that case, marking this as Needs Information from Developers

Can repro for 2.93.0LTS. Unintended behavior may be? >but I am not sure if this is bug or limitation really. @PabloDobarro are glitches like these expected? In that case, marking this as `Needs Information from Developers`

Philipp Oeser removed the

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Multires: Editing base mesh creates random results on higher subdiv levels #81497