Sculpting Smooth brush unexpected result with vertices with two edges #78747

New Issue

Jason S · 2020-07-09T00:15:17+02:00

Jason S commented

2020-07-09 00:15:17 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: AMD Radeon RX 5700 XT ATI Technologies Inc. 4.5.13587 Core Profile Context 20.4.2 26.20.15029.27016

Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: 211b6c29f7
Worked: (newest version of Blender that worked as expected)

Short description of error
While using smooth brush, the mesh has pixels spiking out of the mesh where smooth brush was passed over.

#78747.blend

Open file
one regular Cube (Cube_quads)
one Cube with an ngon (Cube_ngon -- just one edge subdivided)
smooth brush on Cube_ngon leaves that extra vertex untouched from the smoothing "spiking out" (<-- this is unexpected)
smooth brush on Cube_quads smothes all vertices

T78747_2.blend

this one has it as well (no ngons - just a subdivided edge, so a vertex with two edges)

Original report:

Exact steps for others to reproduce the error

Created mesh from planes
Added and applied solidify modifer of 0.01 thickness
Add and apply subdivion modifier of 3.
Apply scale and rotation.
Set origin
Sculpt tab
Voxel remesh of 0.01 with fix poles and preserve volume
Smooth over edge of mesh.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: AMD Radeon RX 5700 XT ATI Technologies Inc. 4.5.13587 Core Profile Context 20.4.2 26.20.15029.27016 **Blender Version** Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: `211b6c29f7` Worked: (newest version of Blender that worked as expected) **Short description of error** While using smooth brush, the mesh has pixels spiking out of the mesh where smooth brush was passed over. [#78747.blend](https://archive.blender.org/developer/F8680798/T78747.blend) - Open file - one regular Cube (`Cube_quads`) - one Cube with an ngon (`Cube_ngon` -- just one edge subdivided) - smooth brush on `Cube_ngon` leaves that extra vertex untouched from the smoothing "spiking out" (<-- this is unexpected) - smooth brush on `Cube_quads` smothes all vertices [T78747_2.blend](https://archive.blender.org/developer/F8680875/T78747_2.blend) - this one has it as well (no ngons - just a subdivided edge, so a vertex with two edges) Original report: **Exact steps for others to reproduce the error** 1. Created mesh from planes 2. Added and applied solidify modifer of 0.01 thickness 3. Add and apply subdivion modifier of 3. 4. Apply scale and rotation. 5. Set origin 6. Sculpt tab 7. Voxel remesh of 0.01 with fix poles and preserve volume 8. Smooth over edge of mesh.![2020-07-08_17-55-08.jpg](https://archive.blender.org/developer/F8678989/2020-07-08_17-55-08.jpg) ![2020-07-08_17-58-16.jpg](https://archive.blender.org/developer/F8678991/2020-07-08_17-58-16.jpg)

Jason S commented

2020-07-09 00:15:17 +02:00

Added subscriber: @Jigglystix

Richard Antalik commented

2020-07-09 09:18:02 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-09 09:18:02 +02:00

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

Richard Antalik commented

2020-07-09 09:18:02 +02:00

Please upload sample file

Jason S commented

2020-07-09 12:21:34 +02:00

See attached. Fixed it in my old file by decimating and remeshing a few times but was able to recreate it in a new file again.

SculptBug_T78747.blend

See attached. Fixed it in my old file by decimating and remeshing a few times but was able to recreate it in a new file again. [SculptBug_T78747.blend](https://archive.blender.org/developer/F8680559/SculptBug_T78747.blend)

Philipp Oeser commented

2020-07-09 14:50:04 +02:00

Added subscribers: @PabloDobarro, @lichtwerk

Philipp Oeser commented

2020-07-09 14:50:04 +02:00

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

Philipp Oeser commented

2020-07-09 14:50:05 +02:00

@PabloDobarro : could it be that the Smooth brush is just not working nicely with ngons?

@PabloDobarro : could it be that the `Smooth` brush is just not working nicely with ngons?

Philipp Oeser changed title from ~~Blender Sculpting Rogue Pixels~~ to Sculpting Smooth brush unexpected result with ngons

2020-07-09 14:54:25 +02:00

Jason S commented

2020-07-09 15:09:19 +02:00

It occurs after a voxel remesh, so there should not be ngons.

Julien Kaspar commented

2020-07-09 15:28:23 +02:00

Added subscriber: @JulienKaspar

Julien Kaspar commented

2020-07-09 15:28:23 +02:00

These are not Ngons but vertices with 2 connected edges. There is a good chance that these are created when the option "Fix Poles" is used in the remsher.
Fix Poles will look for neighbouring N-poles (3 connected edges) and merge them to create regular 4-sided vertices. Sometimes this leads to accidental 2-sided poles.
@PabloDobarro Should know more on this.

These are not Ngons but vertices with 2 connected edges. There is a good chance that these are created when the option "Fix Poles" is used in the remsher. Fix Poles will look for neighbouring N-poles (3 connected edges) and merge them to create regular 4-sided vertices. Sometimes this leads to accidental 2-sided poles. @PabloDobarro Should know more on this.

Philipp Oeser changed title from ~~Sculpting Smooth brush unexpected result with ngons~~ to Sculpting Smooth brush unexpected result with certain topology

2020-07-09 15:30:35 +02:00

Philipp Oeser changed title from ~~Sculpting Smooth brush unexpected result with certain topology~~ to Sculpting Smooth brush unexpected result with vertices with two edges

2020-07-09 15:31:39 +02:00

Philipp Oeser commented

2020-07-09 15:32:54 +02:00

Thx noting, updated the task description

Pablo Dobarro commented

2020-07-09 18:07:06 +02:00

This artifact is produced because the smooth function for meshes has a hardcoded and incorrect way to check for boundary vertices which assumes that if a vertex is connected to 2 or less faces is a mesh boundary and should not be modified by smoothing. I'll work on this, but this needs to be fixed in multiple steps. First is to remove the boundary check from that function and let the automasking system handle that, then I need to add a cache to store which vertices are actually a boundary and add fix the function in the sculpt API.

blender-admin commented

2020-07-15 16:24:03 +02:00

This issue was referenced by e06a346458

This issue was referenced by e06a346458fa898e137cc984f23975f5572d94fb

Pablo Dobarro commented

2020-07-15 16:37:20 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Pablo Dobarro closed this issue

2020-07-15 16:37:20 +02:00

Pablo Dobarro self-assigned this 2020-07-15 16:37:20 +02:00

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Sculpting Smooth brush unexpected result with vertices with two edges #78747