blender/blender
150
486
Fork 717
Code Issues 6.8k Pull Requests 881 Projects 18 Wiki Activity

Clay strips brush leaves cracks on mesh #123768

New Issue
Open
opened 2024-06-26 07:01:46 +02:00 by Shyy-Anzr · 13 comments
Shyy-Anzr commented 2024-06-26 07:01:46 +02:00
Copy Link

System Information
Operating system: Windows-10-10.0.17763-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 516.94

Blender Version
Broken: version: 4.2.0 Beta, branch: blender-v4.2-release, commit date: 2024-06-26 00:39, hash: 224307b9aa48
Worked: never

Short description of error
Undoing big Clay Strips brush stroke does not completely undo affected backfaces, leaving maze-like cracks on mesh.

Curiously, when I was doing video I initially wanted to circle the artifacts with Annotation Tool by holding D key without exiting Sculpt Mode, but immediately as I did that the bug stopped appearing until I re-entered Sculpt Mode. This bug is very fickle and it's important that you don't do any extra steps when reproducing it to not scare it off.

Exact steps for others to reproduce the error

  1. Create a default torus.
  2. Add Multires with five levels.
  3. Enter sculpt mode, select Clay Strips
  4. Do a stroke big enough so backfaces are affected too.
  5. Press Ctrl+Z.
  6. Observe cracks on backfaces.

If hard to reproduce, try to start with attached .blend file and watch video for exact technique.

**System Information** Operating system: Windows-10-10.0.17763-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 516.94 **Blender Version** Broken: version: 4.2.0 Beta, branch: blender-v4.2-release, commit date: 2024-06-26 00:39, hash: `224307b9aa48` Worked: never **Short description of error** Undoing big Clay Strips brush stroke does not completely undo affected backfaces, leaving maze-like cracks on mesh. Curiously, when I was doing video I initially wanted to circle the artifacts with Annotation Tool by holding D key without exiting Sculpt Mode, but immediately as I did that the bug stopped appearing until I re-entered Sculpt Mode. This bug is very fickle and it's important that you don't do any extra steps when reproducing it to not scare it off. **Exact steps for others to reproduce the error** 1. Create a default torus. 2. Add Multires with five levels. 3. Enter sculpt mode, select Clay Strips 4. Do a stroke big enough so backfaces are affected too. 5. Press Ctrl+Z. 6. Observe cracks on backfaces. If hard to reproduce, try to start with attached .blend file and watch video for exact technique.
donut.blend
222 KiB
sculpt_cracks.mp4
1.6 MiB
Shyy-Anzr added the
Type
Report
Severity
Normal
Status
Needs Triage
 labels 2024-06-26 07:01:47 +02:00
YimingWu commented 2024-06-26 08:42:25 +02:00
Member
Copy Link

4.2 at 95a74a02bc seems to still work.

On latest 4.3 ctrl Z straightforward crashes.

4.2 at 95a74a02bcc6 _seems to_ still work. On latest 4.3 ctrl Z straightforward crashes.
YimingWu commented 2024-06-26 08:44:19 +02:00
Member
Copy Link

Crash on assert:

__pthread_kill_implementation (@pthread_kill@@GLIBC_2.34:81)
__pthread_kill_internal (@pthread_kill@@GLIBC_2.34:59)
__GI___pthread_kill (@pthread_kill@@GLIBC_2.34:59)
__GI_raise (@raise:10)
__GI_abort (@abort:46)
_BLI_assert_abort (source/blender/blenlib/intern/BLI_assert.c:51)
void blender::MutableSpan<bool>::fill_indices<int>(blender::Span<int>, bool const&) const (source/blender/blenlib/BLI_span.hh:531)
blender::ed::sculpt_paint::undo::restore_position_grids(blender::MutableSpan<CCGElem *>, const CCGKey &, blender::ed::sculpt_paint::undo::Node &, blender::MutableSpan<bool>) (source/blender/editors/sculpt_paint/sculpt_undo.cc:515)
blender::ed::sculpt_paint::undo::restore_list(bContext *, Depsgraph *, blender::ed::sculpt_paint::undo::StepData &) (source/blender/editors/sculpt_paint/sculpt_undo.cc:936)
blender::ed::sculpt_paint::undo::step_decode_undo_impl(bContext *, Depsgraph *, blender::ed::sculpt_paint::undo::SculptUndoStep *) (source/blender/editors/sculpt_paint/sculpt_undo.cc:1870)
blender::ed::sculpt_paint::undo::step_decode_undo(bContext *, Depsgraph *, blender::ed::sculpt_paint::undo::SculptUndoStep *, const bool) (source/blender/editors/sculpt_paint/sculpt_undo.cc:1905)
blender::ed::sculpt_paint::undo::step_decode(bContext *, Main *, UndoStep *, eUndoStepDir, bool) (source/blender/editors/sculpt_paint/sculpt_undo.cc:1985)
::undosys_step_decode(bContext *, Main *, UndoStack *, UndoStep *, eUndoStepDir, bool) (source/blender/blenkernel/intern/undo_system.cc:221)
BKE_undosys_step_load_data_ex(UndoStack*, bContext*, UndoStep*, UndoStep*, bool) (source/blender/blenkernel/intern/undo_system.cc:821)
BKE_undosys_step_undo_with_data_ex(UndoStack*, bContext*, UndoStep*, bool) (source/blender/blenkernel/intern/undo_system.cc:868)
BKE_undosys_step_undo_with_data(UndoStack*, bContext*, UndoStep*) (source/blender/blenkernel/intern/undo_system.cc:873)
BKE_undosys_step_undo(UndoStack*, bContext*) (source/blender/blenkernel/intern/undo_system.cc:879)
::ed_undo_step_direction(bContext *, eUndoStepDir, ReportList *) (source/blender/editors/undo/ed_undo.cc:289)
::ed_undo_exec(bContext *, wmOperator *) (source/blender/editors/undo/ed_undo.cc:511)
::wm_operator_invoke(bContext *, wmOperatorType *, const wmEvent *, PointerRNA *, ReportList *, const bool, bool) (source/blender/windowmanager/intern/wm_event_system.cc:1587)
Crash on assert: ``` __pthread_kill_implementation (@pthread_kill@@GLIBC_2.34:81) __pthread_kill_internal (@pthread_kill@@GLIBC_2.34:59) __GI___pthread_kill (@pthread_kill@@GLIBC_2.34:59) __GI_raise (@raise:10) __GI_abort (@abort:46) _BLI_assert_abort (source/blender/blenlib/intern/BLI_assert.c:51) void blender::MutableSpan<bool>::fill_indices<int>(blender::Span<int>, bool const&) const (source/blender/blenlib/BLI_span.hh:531) blender::ed::sculpt_paint::undo::restore_position_grids(blender::MutableSpan<CCGElem *>, const CCGKey &, blender::ed::sculpt_paint::undo::Node &, blender::MutableSpan<bool>) (source/blender/editors/sculpt_paint/sculpt_undo.cc:515) blender::ed::sculpt_paint::undo::restore_list(bContext *, Depsgraph *, blender::ed::sculpt_paint::undo::StepData &) (source/blender/editors/sculpt_paint/sculpt_undo.cc:936) blender::ed::sculpt_paint::undo::step_decode_undo_impl(bContext *, Depsgraph *, blender::ed::sculpt_paint::undo::SculptUndoStep *) (source/blender/editors/sculpt_paint/sculpt_undo.cc:1870) blender::ed::sculpt_paint::undo::step_decode_undo(bContext *, Depsgraph *, blender::ed::sculpt_paint::undo::SculptUndoStep *, const bool) (source/blender/editors/sculpt_paint/sculpt_undo.cc:1905) blender::ed::sculpt_paint::undo::step_decode(bContext *, Main *, UndoStep *, eUndoStepDir, bool) (source/blender/editors/sculpt_paint/sculpt_undo.cc:1985) ::undosys_step_decode(bContext *, Main *, UndoStack *, UndoStep *, eUndoStepDir, bool) (source/blender/blenkernel/intern/undo_system.cc:221) BKE_undosys_step_load_data_ex(UndoStack*, bContext*, UndoStep*, UndoStep*, bool) (source/blender/blenkernel/intern/undo_system.cc:821) BKE_undosys_step_undo_with_data_ex(UndoStack*, bContext*, UndoStep*, bool) (source/blender/blenkernel/intern/undo_system.cc:868) BKE_undosys_step_undo_with_data(UndoStack*, bContext*, UndoStep*) (source/blender/blenkernel/intern/undo_system.cc:873) BKE_undosys_step_undo(UndoStack*, bContext*) (source/blender/blenkernel/intern/undo_system.cc:879) ::ed_undo_step_direction(bContext *, eUndoStepDir, ReportList *) (source/blender/editors/undo/ed_undo.cc:289) ::ed_undo_exec(bContext *, wmOperator *) (source/blender/editors/undo/ed_undo.cc:511) ::wm_operator_invoke(bContext *, wmOperatorType *, const wmEvent *, PointerRNA *, ReportList *, const bool, bool) (source/blender/windowmanager/intern/wm_event_system.cc:1587) ```
YimingWu added
Module
Sculpt, Paint & Texture
Status
Confirmed
 and removed
Status
Needs Triage
 labels 2024-06-26 08:44:38 +02:00
YimingWu commented 2024-06-26 08:47:30 +02:00
Member
Copy Link

poke poke @HooglyBoogly apparently broken by 59d84a4c42

poke poke @HooglyBoogly apparently broken by 59d84a4c422887d0772dcde104c1a361c4f373a2
YimingWu added
Severity
High
 and removed
Severity
Normal
 labels 2024-06-26 08:47:42 +02:00
Shyy-Anzr commented 2024-06-26 08:56:13 +02:00
Author
Copy Link

I know that this issue exist in 4.1, 4.0, and even in 3.6 too(just checked). That's why I cannot date it's introduction.

I know that this issue exist in 4.1, 4.0, and even in 3.6 too(just checked). That's why I cannot date it's introduction.
YimingWu commented 2024-06-26 08:59:12 +02:00
Member
Copy Link

Humm I guess then the assert crash is actually a different thing... I can revert that to get no crash at this time, but I am not really able to reproduce the "cracks on backfaces" look. It's either crash or working as I'm expecting

Humm I guess then the assert crash is actually a different thing... I can revert that to get no crash at this time, but I am not really able to reproduce the "cracks on backfaces" look. It's either crash or working as I'm expecting
Shyy-Anzr commented 2024-06-26 09:07:13 +02:00
Author
Copy Link

Here's a video where I reproduced it in 3.6.7.

Here's a video where I reproduced it in 3.6.7.
cracks_367.mp4
1.1 MiB
Shyy-Anzr commented 2024-06-26 09:23:43 +02:00
Author
Copy Link

Checked on 3.6.13 LTS, same story. Also tested on different machine with different GPU model and driver version number. Same.

This could be more apparent because of my brush settings for Clay Strips or something with startup file. If there's still a problem with reproduction, try donut.blend in the original post. It should have my brush and scene settings included, if I'm understanding correctly.

Checked on 3.6.13 LTS, same story. Also tested on different machine with different GPU model and driver version number. Same. This could be more apparent because of my brush settings for Clay Strips or something with startup file. If there's still a problem with reproduction, try `donut.blend` in the original post. It should have my brush and scene settings included, if I'm understanding correctly.
Hans Goudey self-assigned this 2024-06-26 13:48:31 +02:00
Hans Goudey added
Type
Bug
 and removed
Type
Report
 labels 2024-06-27 19:54:20 +02:00
Hans Goudey commented 2024-06-27 19:54:54 +02:00
Member
Copy Link

Thanks for the report. The issue with cracks appearing with the clay strips brush is a known issue right now unfortunately. But I resolved the crash now so the situation should be improved.

Thanks for the report. The issue with cracks appearing with the clay strips brush is a known issue right now unfortunately. But I resolved the crash now so the situation should be improved.
Blender Bot added
Status
Resolved
 and removed
Status
Confirmed
 labels 2024-06-27 19:55:48 +02:00
Shyy-Anzr commented 2024-06-27 20:20:24 +02:00
Author
Copy Link

Should it be closed then? The crash was separate issue not reported by me and I don't know any duplicates of this issue to follow.

Should it be closed then? The crash was separate issue not reported by me and I don't know any duplicates of **this** issue to follow.
Blender Bot added
Status
Confirmed
 and removed
Status
Resolved
 labels 2024-06-27 21:13:49 +02:00
Hans Goudey added
Severity
Normal
 and removed
Severity
High
 labels 2024-06-27 21:55:37 +02:00
Hans Goudey changed title from Undo doesn't work completely for multires sculpting with big brushstrokes, leaves cracks on mesh to Clay strips brush leaves cracks on mesh 2024-06-27 21:55:49 +02:00
Hans Goudey commented 2024-06-27 21:56:04 +02:00
Member
Copy Link

Good point, thanks.

Good point, thanks.
Hans Goudey added
Type
Known Issue
 and removed
Type
Bug
 labels 2024-07-15 16:37:20 +02:00
Hans Goudey removed their assignment 2024-08-01 20:13:10 +02:00
Sean Kim commented 2024-09-26 04:53:02 +02:00
Member
Copy Link

A note from @Nicola-Dessi in the module chat:

I was playing with some settings and realized that using a higher radius_scale in do_brush_action seems to fix this bug

I don't know why though, sqrt2 looks correct from a theoretical point of view

Ah, in fact the main problem is with tip roundness at 1 because the logic in BKE_brush_has_cube_tip is flawed. Always returning true for the clay strips brush fixes 99% of the problems. Should I open another bug report?

After some more playing with the brush I'm 90% certain the values for the radius_scale are just wrong. The values chosen seem to only consider the max distance in the xy plane of the brush, which is sqrt2 when tip roundess is at 0, but the clay strips also has a strong influence in the z axis and therefore the max distance should be sqrt3.

A note from @Nicola-Dessi in the module chat: > I was playing with some settings and realized that using a higher radius_scale in do_brush_action seems to fix this bug > I don't know why though, sqrt2 looks correct from a theoretical point of view > Ah, in fact the main problem is with tip roundness at 1 because the logic in BKE_brush_has_cube_tip is flawed. Always returning true for the clay strips brush fixes 99% of the problems. Should I open another bug report? > After some more playing with the brush I'm 90% certain the values for the radius_scale are just wrong. The values chosen seem to only consider the max distance in the xy plane of the brush, which is sqrt2 when tip roundess is at 0, but the clay strips also has a strong influence in the z axis and therefore the max distance should be sqrt3.
👍 1
YimingWu commented 2024-09-26 07:59:07 +02:00
Member
Copy Link

If there's no further side effects of said change, I'm for it. That way we don't need to manually tune the depth cutoff value for the clay strip brush each time.

If there's no further side effects of said change, I'm for it. That way we don't need to manually tune the depth cutoff value for the clay strip brush each time.
Nicola-Dessi commented 2024-09-26 12:50:01 +02:00
Copy Link

I should add that plane offset and z-scale (which as I said in chat I would just keep at 100% instead of 125%) should also be considered when calculating the center point and radius to use in pbvh_gather_generic.

I should add that plane offset and z-scale (which as I said in chat I would just keep at 100% instead of 125%) should also be considered when calculating the center point and radius to use in pbvh_gather_generic.
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels   
Interest
Alembic

  
Interest
Animation & Rigging

  
Interest
Asset System
Asset datablocks, libraries, browser and shelf

  
Interest
Audio

  
Interest
Automated Testing

  
Interest
Blender Asset Bundle

  
Interest
BlendFile

  
Interest
Collada

  
Interest
Compatibility
Backward and forward compatibility

  
Interest
Compositing

  
Interest
Core

  
Interest
Cycles

  
Interest
Dependency Graph

  
Interest
Development Management

  
Interest
EEVEE

  
Interest
Freestyle

  
Interest
Geometry Nodes

  
Interest
Grease Pencil

  
Interest
ID Management

  
Interest
Images & Movies

  
Interest
Import Export

  
Interest
Line Art

  
Interest
Masking

  
Interest
Metal

  
Interest
Modeling

  
Interest
Modifiers

  
Interest
Motion Tracking

  
Interest
Nodes & Physics

  
Interest
OpenGL

  
Interest
Overlay

  
Interest
Overrides

  
Interest
Performance

  
Interest
Physics

  
Interest
Pipeline, Assets & IO

  
Interest
Platforms, Builds & Tests

  
Interest
Python API

  
Interest
Render & Cycles

  
Interest
Render Pipeline

  
Interest
Sculpt, Paint & Texture

  
Interest
Text Editor

  
Interest
Translations

  
Interest
Triaging

  
Interest
Undo

  
Interest
USD

  
Interest
User Interface

  
Interest
UV Editing

  
Interest
VFX & Video

  
Interest
Video Sequencer

  
Interest
Viewport & EEVEE

  
Interest
Virtual Reality

  
Interest
Vulkan

  
Interest
Wayland
Wayland windowing on Unix

  
Interest
Workbench

  
Interest: X11

Xorg/X11 windowing

  
Legacy
Asset Browser Project

Archived

  
Legacy
Blender 2.8 Project

Archived

  
Legacy
Milestone 1: Basic, Local Asset Browser

Archived

  
Legacy
OpenGL Error

Archived

  
Meta
Good First Issue

  
Meta
Papercut

  
Meta
Retrospective

  
Meta
Security
Related to security, https://wiki.blender.org/wiki/Process/Vulnerability_Reports

  
Module
Animation & Rigging

  
Module
Core

  
Module
Development Management

  
Module
Grease Pencil

  
Module
Modeling

  
Module
Nodes & Physics

  
Module
Pipeline, Assets & IO

  
Module
Platforms, Builds & Tests

  
Module
Python API

  
Module
Render & Cycles

  
Module
Sculpt, Paint & Texture

  
Module
Triaging

  
Module
User Interface

  
Module
VFX & Video

  
Module
Viewport & EEVEE

  
Platform
FreeBSD

  
Platform
Linux

  
Platform
macOS

  
Platform
Windows

  
Severity
High

  
Severity
Low

  
Severity
Normal

  
Severity
Unbreak Now!

  
Status
Archived

  
Status
Confirmed

  
Status
Duplicate

  
Status
Needs Info from Developers

  
Status
Needs Information from User

  
Status
Needs Triage

  
Status
Resolved

  
Type
Bug

  
Type
Design

  
Type
Known Issue

  
Type
Patch

Archived

  
Type
Report

Archived

  
Type
To Do

No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset System
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Viewport & EEVEE
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Asset Browser Project
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Module
Viewport & EEVEE
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Severity
High
Severity
Low
Severity
Normal
Severity
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
Milestone
Clear milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
No Assignees
5 Participants
Notifications
Due Date
The due date is invalid or out of range. Please use the format 'yyyy-mm-dd'.

No due date set.

Dependencies

No dependencies set.

Reference: blender/blender#123768
No description provided.
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?