Vulkan GPU Backend: Overlay issue when using Brushstroke Draw Tool #133673

New Issue

Elena Felici · 2025-01-27T17:33:56+01:00

Elena Felici commented

2025-01-27 17:33:56 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 566.36 Opengl Backend

Blender Version
Broken: version: 4.3.2, branch: blender-v4.3-release, commit date: 2024-12-16 21:10, hash: 32f5fdce0a0a
Worked: (newest version of Blender that worked as expected)

Short description of error
Using Brushstroke Tools v1.1.1, whenever I try to draw using the Brushstroke Draw Tool on a simple, subdivided and UV mapped Cube, the curves drawn do not snap on the surface. They therefore are not usually displayed as brush strokes on the cube since the curve points don't touch the faces.
This issue just occurs when Vulkan is used as GPU Backend (Experimental Feature) - It might be an overlay issue.

Exact steps for others to reproduce the error
Based on the simplified attached .blend file.

Enable Experimental Features, Enable Vulkan as Backend Display Graphics in the System Preferences.
Select cube in Object Mode
Open Brushstroke Tools
Click on 'Draw'
Try to Draw on the surface of the Cube

Please see the attached video as reference.

This issue was mentioned here, @SimonThommes requested a bug report.
Brushstroke Tools: Brushstroke Draw Tool doesn't snap curves to mesh (studio/blender-studio-tools#370)

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3080/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 566.36 Opengl Backend **Blender Version** Broken: version: 4.3.2, branch: blender-v4.3-release, commit date: 2024-12-16 21:10, hash: `32f5fdce0a0a` Worked: (newest version of Blender that worked as expected) **Short description of error** Using Brushstroke Tools v1.1.1, whenever I try to draw using the Brushstroke Draw Tool on a simple, subdivided and UV mapped Cube, the curves drawn do not snap on the surface. They therefore are not usually displayed as brush strokes on the cube since the curve points don't touch the faces. This issue just occurs when Vulkan is used as GPU Backend (Experimental Feature) - It might be an overlay issue. **Exact steps for others to reproduce the error** Based on the simplified attached .blend file. 0. Enable Experimental Features, Enable Vulkan as Backend Display Graphics in the System Preferences. 1. Select cube in Object Mode 2. Open Brushstroke Tools 3. Click on 'Draw' 4. Try to Draw on the surface of the Cube Please see the attached video as reference. This issue was mentioned here, @SimonThommes requested a bug report. Brushstroke Tools: Brushstroke Draw Tool doesn't snap curves to mesh (studio/blender-studio-tools#370)

cube.blend

17 MiB

2b7e0299-2605-4bfd-8752-c2ca1ca6e712.mp4

8.2 MiB

Elena Felici added the

labels 2025-01-27 17:33:57 +01:00

Alaska commented

2025-01-28 00:57:47 +01:00

The vulkan backend in 4.3.2 was still quite experimental, and had a lot of known limitations. Specifically for this case, I believe there were some known issues with depth, which would be used for the Draw on surface feature.

I believe these issues are fixed in 4.4, but I can't properly test it due to another bug.

I will file a seperate bug report for that other bug, and while investigating I will see if I can confirm if this issue has been fixed or not.

The vulkan backend in 4.3.2 was still quite experimental, and had a lot of known limitations. Specifically for this case, I believe there were some known issues with depth, which would be used for the `Draw on surface` feature. I believe these issues are fixed in 4.4, but I can't properly test it due to another bug. I will file a seperate bug report for that other bug, and while investigating I will see if I can confirm if this issue has been fixed or not.

Alaska commented

2025-01-28 04:47:33 +01:00

In my testing, the issue is fixed in 4.4.
Can you double check that it's fixed in 4.4 for you too? https://builder.blender.org/download/daily/

Note: You may need to draw for 5 seconds before things start to show up. I have opened a new bug report for that issue: #133690

In my testing, the issue is fixed in 4.4. Can you double check that it's fixed in 4.4 for you too? https://builder.blender.org/download/daily/ Note: You may need to draw for 5 seconds before things start to show up. I have opened a new bug report for that issue: #133690

Alaska added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2025-01-28 04:48:16 +01:00

Sign in to join this conversation.