Remesh Modifier in Voxel mode produces surface artifacts when Adaptivity enabled #82834

New Issue

Andrii Mykhailov · 2020-11-19T09:12:56+01:00

Andrii Mykhailov commented

2020-11-19 09:12:56 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken:

2.83.9
2.91.0 Beta, branch: master, commit date: 2020-11-17 22:01, hash: e580c18853
2.92.0
Worked: never

Short description of error
Remesh modifier produces artifacts on mesh which look like a result of bad triangulation.

Exact steps for others to reproduce the error

Open attached blender file
Open modifier panel and select testMesh
Change adaptivity value from 1 to 0 cm and back
Observe black shading artifacts
remesh_bug.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71 **Blender Version** Broken: - 2.83.9 - 2.91.0 Beta, branch: master, commit date: 2020-11-17 22:01, hash: `e580c18853` - 2.92.0 Worked: never **Short description of error** Remesh modifier produces artifacts on mesh which look like a result of bad triangulation. **Exact steps for others to reproduce the error** 1. Open attached blender file 2. Open modifier panel and select testMesh 3. Change adaptivity value from 1 to 0 cm and back 4. Observe black shading artifacts [remesh_bug.blend](https://archive.blender.org/developer/F9323133/remesh_bug.blend) ![remesh_bug.png](https://archive.blender.org/developer/F9323140/remesh_bug.png)

Andrii Mykhailov commented

2020-11-19 09:12:56 +01:00

Added subscriber: @zelfit

Robert Guetzkow commented

2020-11-19 10:03:13 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2020-11-19 10:03:13 +01:00

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

Robert Guetzkow commented

2020-11-19 10:03:13 +01:00

The issue is that the modifier creates a vertex connected to surrounding vertices, but places it outside of the 1-ring neighborhood. This results in a self intersecting mesh and the strange shading. The vertex should be placed within the bounds of the surrounding 1-ring neighborhood or not be generated at all.

Note: While I have confirmed this problem for now, this ticket may get closed if this turns out to be an inherent limitation of the current implementation.

Contrary to my original comment, it does close the mesh properly. All neighboring vertices form a face.

The issue is that the modifier creates a vertex connected to surrounding vertices, but places it outside of the 1-ring neighborhood. This results in a self intersecting mesh and the strange shading. The vertex should be placed within the bounds of the surrounding 1-ring neighborhood or not be generated at all. ![remesh_modifier.png](https://archive.blender.org/developer/F9323681/remesh_modifier.png) Note: While I have confirmed this problem for now, this ticket may get closed if this turns out to be an inherent limitation of the current implementation. Contrary to my original comment, it does close the mesh properly. All neighboring vertices form a face.

Leonard Siebeneicher commented

2021-08-08 19:11:25 +02:00

Added subscriber: @LeonardSiebeneicher

Leonard Siebeneicher commented

2021-08-08 19:11:26 +02:00

There is another reason too.

Adaptive Voxel Remesher erases some details, and puts a lot of faces on areas which do not change much.

Just use Adaptive Voxel Remesh on a sphere:

For some reason adaptive remesh does add a lot of detail to the sphere, while other areas are kept low-detail.
If a smooth brush on this sphere is used, there will be a lot of artifacts on areas where surface details vary.

There is another reason too. Adaptive Voxel Remesher erases some details, and puts a lot of faces on areas which do not change much. Just use Adaptive Voxel Remesh on a sphere: ![aremesh.jpg](https://archive.blender.org/developer/F10274393/aremesh.jpg) For some reason adaptive remesh does add a lot of detail to the sphere, while other areas are kept low-detail. If a smooth brush on this sphere is used, there will be a lot of artifacts on areas where surface details vary.

Philipp Oeser removed the

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Remesh Modifier in Voxel mode produces surface artifacts when Adaptivity enabled #82834