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Maniphest T74381

sculpt mode artifacts if displace modifier is active
Confirmed, NormalPublicKNOWN ISSUE
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.28

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: rB77d23b0bd76f
Worked: (optional)

Short description of error
In sculpt mode if the displace modifier is active the brush behavior is unpredictable, especially with the smooth brush.
It looks like that the sculpting mode takes account of the mesh after being modified by the modifier and start the sculpt over it.
'm reporting this because in other modes the modifier and the actual edit of the mesh are handled as separate thing.

Exact steps for others to reproduce the error

  • Open any of the attached files and try to smooth or grab as done in the video

thanks!
Max

smooth_bug.blend4 MBDownload

sculptbug_24062022_1422_44.blend18 MBDownload

Related Objects

Event Timeline

Massimiliano Puliero (mmaaxx) created this task.Mar 3 2020, 12:43 AM
Germano Cavalcante (mano-wii) added subscribers: Pablo Dobarro (pablodp606), Germano Cavalcante (mano-wii).Mar 3 2020, 8:31 PM

I opened the file but either I don't know how to reproduce it or the problem seems to have been resolved.
@Massimiliano Puliero (mmaaxx), please try the latest daily build: https://builder.blender.org/download/

@Pablo Dobarro (pablodp606), can you confirm?

Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Mar 4 2020, 3:43 AM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

I can confirm this with smooth brush (even though in video smooth brush is used while draw brush tool is selected?).

Removing modifier helps
Enabling dyntopo helps as well

Richard Antalik (ISS) added a project: Sculpt, Paint & Texture.Mar 4 2020, 3:50 AM
Massimiliano Puliero (mmaaxx) added a comment.Mar 4 2020, 4:10 AM

@Richard Antalik (ISS)
yes, press Shift automatically switch to smooth brush, it is a common workflow.

Ofcourse turn off the modifier solves the problem, the issue infact involve the smooth brush+the modifier, excluding one of the two terms prevent the bug indeed.

Thanks.

Jacques Lucke (JacquesLucke) added a subscriber: Jacques Lucke (JacquesLucke).Mar 18 2020, 1:52 PM

Increasing the strength of the Displace modifier, makes the issue even more visible.
While the behavior is not very nice, I assume this has benefits in other cases... Could be that this is a known issue.

@Pablo Dobarro (pablodp606) what do you think?

Bastien Montagne (mont29) changed the subtype of this task from "Report" to "Known Issue".Oct 14 2020, 10:17 AM
Julien Kaspar (JulienKaspar) moved this task from Backlog to Known Issues on the Sculpt, Paint & Texture board.Apr 20 2021, 1:08 PM
Germano Cavalcante (mano-wii) mentioned this in T99149: The surface directions are calculated completely wrong when the mesh has a displacement modifier.Jun 28 2022, 9:21 PM
Germano Cavalcante (mano-wii) merged a task: T99149: The surface directions are calculated completely wrong when the mesh has a displacement modifier.
Germano Cavalcante (mano-wii) added subscribers: kursad k (kursadk), Pratik Borhade (PratikPB2123).
Germano Cavalcante (mano-wii) updated the task description. (Show Details)Jun 28 2022, 9:24 PM
kursad k (kursadk) added a comment.Jun 28 2022, 11:15 PM

This issue has not been resolved and it is still there as can be seen by my report. It would be nice if the sculpt brushes do not take modified positions and just work on the mesh instead, at least having this as an option would be nice. As of now the final surface positions come out very uggly when one adds certain modifiers on the mesh.