Sharp normals along base mesh wires in multires sculpting with smooth shading #80641

New Issue

Julien Kaspar · 2020-09-09T17:42:56+02:00

Julien Kaspar commented

2020-09-09 17:42:56 +02:00

System Information
Operating system: Linux-5.4.0-47-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: Quadro GP100/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-09 05:37, hash: 0b311eeca5
Worked: As far as I know in 2.79 before the inclusion of OpenSubdiv

Short description of error
This has been a long standing issue in multires sculpting with shading artefacts in smooth shading.
These will only start appearing when sculpting on the surface and may flicker between different spots when sculpting directly over them.

Exact steps for others to reproduce the error

Create a suzanne head
Add a multires modifier with 4 subdivisions
Change the object to smooth shading
Enter sculpt mode and smooth on the surface of the object

On these spots the sharp shading should consistently appear among others. A high contrast Matcap can help with spotting them.
In this example they are very subtle but they can be extremely noticeable on very curved surfaces.

**System Information** Operating system: Linux-5.4.0-47-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: Quadro GP100/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-09 05:37, hash: `0b311eeca5` Worked: As far as I know in 2.79 before the inclusion of OpenSubdiv **Short description of error** This has been a long standing issue in multires sculpting with shading artefacts in smooth shading. These will only start appearing when sculpting on the surface and may flicker between different spots when sculpting directly over them. **Exact steps for others to reproduce the error** - Create a suzanne head - Add a multires modifier with 4 subdivisions - Change the object to smooth shading - Enter sculpt mode and smooth on the surface of the object On these spots the sharp shading should consistently appear among others. A high contrast Matcap can help with spotting them. In this example they are very subtle but they can be extremely noticeable on very curved surfaces. ![Screenshot_2020-09-09_17-35-27.png](https://archive.blender.org/developer/F8858383/Screenshot_2020-09-09_17-35-27.png) ![Screenshot_2020-09-09_17-35-46.png](https://archive.blender.org/developer/F8858386/Screenshot_2020-09-09_17-35-46.png)

👍 1

Julien Kaspar commented

2020-09-09 17:42:56 +02:00

Added subscriber: @JulienKaspar

blender-admin commented

2020-09-09 17:42:56 +02:00

#86980 was marked as duplicate of this issue

Julien Kaspar commented

2020-09-09 17:43:13 +02:00

Added subscriber: @Sergey

Richard Antalik commented

2020-09-15 13:20:51 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-09-15 13:20:51 +02:00

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

Richard Antalik commented

2020-09-15 13:20:51 +02:00

I can't reproduce this. Do you need to change some brush settings to make this issue more evident? Perhaps can you make video recording when this happens?

Julien Kaspar commented

2020-09-17 10:55:03 +02:00

@iss Try a high contrast matcap to make it more visible. Also smooth with a small radius on a spot that is nowhere near the areas that I've shown in the images.
I checked with others and they can reproduce it.

@iss Try a high contrast matcap to make it more visible. Also smooth with a small radius on a spot that is nowhere near the areas that I've shown in the images. I checked with others and they can reproduce it.

Richard Antalik commented

2020-09-17 15:32:48 +02:00

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

Richard Antalik commented

2020-09-17 15:32:48 +02:00

Default metal_shiny.exr matcap worked great here, I can reproduce easily by sculpting in area displayed in your second image.

After undoing stroke, sharp edges remain there, but they dissappear when switching to object mode.

Default `metal_shiny.exr` matcap worked great here, I can reproduce easily by sculpting in area displayed in your second image. After undoing stroke, sharp edges remain there, but they dissappear when switching to object mode.

Pablo Dobarro commented

2021-01-22 00:48:51 +01:00

Added subscriber: @PabloDobarro

Pablo Dobarro commented

2021-01-22 00:48:51 +01:00

I would rather wait for #84864 before investigating this

Julien Kaspar commented

2022-05-12 13:36:57 +02:00

Added subscribers: @Vyach, @PratikPB2123

unizen commented

2022-12-18 03:06:40 +01:00

Added subscriber: @unizen

Philipp Oeser removed the

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Sharp normals along base mesh wires in multires sculpting with smooth shading #80641