Making changes to your vertex painted sculpt in Sculpt Mode creates rendering artefacts in the colours relative to your camera position #75908

New Issue

Frozen_Death_Knight · 2020-04-19T22:58:21+02:00

2020-04-19 22:58:21 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.50

Blender Version
Broken: version: 2.83 (sub 13), branch: master, commit date: 2020-04-17 20:03, hash: 76b3aac802

Short description of error
While doing some regular testing in 2.83, I noticed that the current vertex painting system does not work nicely with Sculpt Mode. I thought the problem might have been related to Delay Viewport Updates because the bug only appeared when sculpting and undoing/redoing in relation to how zoomed in or out the viewport camera was to the model itself. However, toggling it on and off did nothing, so I am left puzzled.
Desktop 2020.04.19 - 13.45.42.02.mp4

Exact steps for others to reproduce the error

Take a human sized sculpt of several tens of thousands of vertices and paint it in Vertex Paint Mode.
Switch to Sculpt Mode.
Make any change to your sculpt with the tools available while zoomed in on the model.
Zoom out. The vertex painting artefacts should be fully visible now.
Use undo/redo to activate or deactivate the bug. The bug will disappear when the entire model is visible in the viewport, but appear if you are zoomed in and then you zoom out again.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.50 **Blender Version** Broken: version: 2.83 (sub 13), branch: master, commit date: 2020-04-17 20:03, hash: `76b3aac802` **Short description of error** While doing some regular testing in 2.83, I noticed that the current vertex painting system does not work nicely with Sculpt Mode. I thought the problem might have been related to Delay Viewport Updates because the bug only appeared when sculpting and undoing/redoing in relation to how zoomed in or out the viewport camera was to the model itself. However, toggling it on and off did nothing, so I am left puzzled. [Desktop 2020.04.19 - 13.45.42.02.mp4](https://archive.blender.org/developer/F8483346/Desktop_2020.04.19_-_13.45.42.02.mp4) **Exact steps for others to reproduce the error** 1. Take a human sized sculpt of several tens of thousands of vertices and paint it in Vertex Paint Mode. 2. Switch to Sculpt Mode. 3. Make any change to your sculpt with the tools available while zoomed in on the model. 4. Zoom out. The vertex painting artefacts should be fully visible now. 5. Use undo/redo to activate or deactivate the bug. The bug will disappear when the entire model is visible in the viewport, but appear if you are zoomed in and then you zoom out again.

Frozen_Death_Knight commented

2020-04-19 22:58:21 +02:00

Added subscriber: @Frozen_Death_Knight

Philipp Oeser commented

2020-04-20 09:29:52 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-04-20 09:29:52 +02:00

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

Philipp Oeser commented

2020-04-20 09:29:52 +02:00

Could you please share you .blend file?

Frozen_Death_Knight commented

2020-04-20 10:08:57 +02:00

@lichtwerk Here's the model.
Urbosa Sculpt.blend

@lichtwerk Here's the model. [Urbosa Sculpt.blend](https://archive.blender.org/developer/F8484798/Urbosa_Sculpt.blend)

Philipp Oeser commented

2020-04-20 19:11:18 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Philipp Oeser commented

2020-04-20 19:11:18 +02:00

Can confirm in this file (having trouble reproducing this from scratch though...)

Richard Antalik commented

2020-04-22 15:47:05 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-04-22 15:47:05 +02:00

I can cause glitches when going to material preview and solid shading, I think there is same underlying issue. But I can reproduce this even with files created from scratch.

Philipp Oeser commented

2020-04-22 16:02:29 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Philipp Oeser commented

2020-04-22 16:02:29 +02:00

Added subscribers: @PabloDobarro, @dfelinto

Philipp Oeser commented

2020-04-22 16:02:29 +02:00

#74694, #74622 are also about sculpt drawing glitches.

@iss: if you have a way to repro from scratch: mind putting this in the task description?

@PabloDobarro : mind checking?

@dfelinto: to me, this is a High prio one, feel free to change back...

#74694, #74622 are also about sculpt drawing glitches. @iss: if you have a way to repro from scratch: mind putting this in the task description? @PabloDobarro : mind checking? @dfelinto: to me, this is a High prio one, feel free to change back...

Richard Antalik commented

2020-04-23 09:35:39 +02:00

In #75908#915562, @lichtwerk wrote:
@iss: if you have a way to repro from scratch: mind putting this in the task description?

I meant that I can cause glitches when going to material preview and solid shading on file created from scratch
untitled.blend

Open Blender (glitches are more prominent on fresh run)
Open file

Switch viewport to Material Preview and immediately back to Solid

In some cases it was necessary to repeat step 3.

I have done more investigation on original file, and it seems that issue goes away when you remove other viewports from sculpting workspace. Will do more testing to narrow this down and upload new file if I find "root cause"

> In #75908#915562, @lichtwerk wrote: > @iss: if you have a way to repro from scratch: mind putting this in the task description? I meant that I can cause glitches when going to material preview and solid shading on file created from scratch [untitled.blend](https://archive.blender.org/developer/F8490641/untitled.blend) - Open Blender (glitches are more prominent on fresh run) - Open file # Switch viewport to Material Preview and immediately back to Solid In some cases it was necessary to repeat step 3. ---- I have done more investigation on original file, and it seems that issue goes away when you remove other viewports from sculpting workspace. Will do more testing to narrow this down and upload new file if I find "root cause"

Pablo Dobarro was assigned by Dalai Felinto

2020-05-11 14:35:47 +02:00

Jeroen Bakker commented

2020-05-12 10:35:37 +02:00

Added subscriber: @Jeroen-Bakker

Jeroen Bakker commented

2020-05-12 10:35:37 +02:00

In this scenario the 'ac' (active vertex color) of the draw batch that sculpting generates contain uninitialized memory. Perhaps we should add a safeguard to regenerate all VBO.

In this scenario the 'ac' (active vertex color) of the draw batch that sculpting generates contain uninitialized memory. Perhaps we should add a safeguard to regenerate all VBO. ![image.png](https://archive.blender.org/developer/F8530055/image.png)

Pablo Dobarro was unassigned by Jeroen Bakker

2020-05-12 11:44:21 +02:00

Jeroen Bakker self-assigned this 2020-05-12 11:44:21 +02:00

blender-admin commented

2020-05-14 11:56:16 +02:00

This issue was referenced by 7d38f50367

This issue was referenced by 7d38f5036794e7bf2678c8138b940257b152435b

Jeroen Bakker commented

2020-05-14 12:00:53 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Jeroen Bakker closed this issue

2020-05-14 12:00:53 +02:00

Thomas Dinges added this to the 2.83 LTS milestone 2023-02-08 16:38:05 +01:00

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Making changes to your vertex painted sculpt in Sculpt Mode creates rendering artefacts in the colours relative to your camera position #75908

Switch viewport to Material Preview and immediately back to Solid