Flashing vertices on screen updates #84627

New Issue

Michael Glen Montague · 2021-01-12T09:04:58+01:00

2021-01-12 09:04:58 +01:00

System Information
Windows 10 Home, version 1909, 64-bit

Graphics card:	Author:
GeForce GT 710/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12	@Code_Craft_Plugin
GeForce GTX 780/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89	@MontagueMGM

Blender Version
Broken: 2.83.0 - 2.83.10 (still broken as of latest 2.92.0 alpha experimental build acbda123ad)
Worked: 2.82.7

Short description of error
Vertices flash when the screen is updating. Only on my desktop using a GTX 780, not my laptop using an i7-1065G7 (Intel Iris Plus)

Exact steps for others to reproduce the error
Create an Ico Sphere with subdivisions set to 6. It happens at levels 5 and 7 as well, but not nearly as noticeable. It seems related to a specific vertex count, rather than proportional to the number of vertices.

Blender 2021-01-12 02-13-49.mp4

**System Information** Windows 10 Home, version 1909, 64-bit | Graphics card: | Author: | -- | -- | | GeForce GT 710/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12 | @Code_Craft_Plugin | GeForce GTX 780/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89 | @MontagueMGM **Blender Version** Broken: 2.83.0 - 2.83.10 (still broken as of latest 2.92.0 alpha experimental build acbda123ad08) Worked: 2.82.7 **Short description of error** Vertices flash when the screen is updating. Only on my desktop using a GTX 780, not my laptop using an i7-1065G7 (Intel Iris Plus) **Exact steps for others to reproduce the error** Create an Ico Sphere with subdivisions set to 6. It happens at levels 5 and 7 as well, but not nearly as noticeable. It seems related to a specific vertex count, rather than proportional to the number of vertices. [Blender 2021-01-12 02-13-49.mp4](https://archive.blender.org/developer/F9560738/Blender_2021-01-12_02-13-49.mp4)

Michael Glen Montague commented

2021-01-12 09:04:58 +01:00

Added subscriber: @MontagueMGM

blender-admin commented

2021-01-12 09:04:58 +01:00

#94024 was marked as duplicate of this issue

Falk David commented

2021-01-12 09:50:29 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-01-12 09:50:29 +01:00

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

Falk David commented

2021-01-12 09:50:29 +01:00

I cannot reproduce this. Could you provide the .blend file? What is weird to me is that in the video it seems that you have used a cube primitive.

Michael Glen Montague commented

2021-01-12 10:04:20 +01:00

In #84627#1091669, @filedescriptor wrote:
I cannot reproduce this. Could you provide the .blend file? What is weird to me is that in the video it seems that you have used a cube primitive.

This happens in the factory startup file. The object in the video was originally a cube (made into an ico sphere in edit mode), but the same thing happens with a new object created as an ico sphere directly.

> In #84627#1091669, @filedescriptor wrote: > I cannot reproduce this. Could you provide the .blend file? What is weird to me is that in the video it seems that you have used a cube primitive. This happens in the factory startup file. The object in the video was originally a cube (made into an ico sphere in edit mode), but the same thing happens with a new object created as an ico sphere directly.

Falk David commented

2021-01-12 10:10:45 +01:00

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

Falk David commented

2021-01-12 10:10:45 +01:00

Still can't reproduce (I tried latest master and latest LTS). Does the error come up as soon as you switch to edit mode? Do you select any vertices?

Michael Glen Montague commented

2021-01-12 10:16:42 +01:00

As soon as switching to edit mode, regardless of vertex selection

Blender 2021-01-12 04-18-41.mp4

As soon as switching to edit mode, regardless of vertex selection [Blender 2021-01-12 04-18-41.mp4](https://archive.blender.org/developer/F9560816/Blender_2021-01-12_04-18-41.mp4)

Robert Guetzkow commented

2021-01-12 10:33:39 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2021-01-12 10:33:39 +01:00

Could you please save your full system information through Help > Save System Info and upload the file?

Could you please save your full system information through *Help > Save System Info* and upload the file?

Michael Glen Montague commented

2021-01-12 10:38:36 +01:00

system-info.txt

[system-info.txt](https://archive.blender.org/developer/F9560827/system-info.txt)

Robert Guetzkow commented

2021-01-12 10:46:03 +01:00

Please open Blender's installation directory and double click on the blender_debug_gpu.cmd. This will start Blender in debug mode and create log files. Try to make Blender glitch again. Once it does, close Blender. The Windows Explorer should open and show you up to two files, a debug log and the system information. Add the debug log to your report.

Please open Blender's installation directory and double click on the `blender_debug_gpu.cmd`. This will start Blender in debug mode and create log files. Try to make Blender glitch again. Once it does, close Blender. The Windows Explorer should open and show you up to two files, a debug log and the system information. Add the debug log to your report.

Michael Glen Montague commented

2021-01-12 11:00:01 +01:00

The glitch happens again but the debug output doesn't seem to show it: blender_debug_output.txt

The glitch happens again but the debug output doesn't seem to show it: [blender_debug_output.txt](https://archive.blender.org/developer/F9560845/blender_debug_output.txt)

Daniel Mendelowitz commented

2021-02-09 21:04:24 +01:00

Added subscriber: @danm3d

Daniel Mendelowitz commented

2021-02-09 21:04:24 +01:00

I also have a GTX 780 and am experiencing the exact same issue. Perhaps an issue with older hardware and newer driver (I'm running 460.89)?
Attached screen recording and debug logs below.

8YrVDuthce.mp4
blender_debug_output.txt
blender_system_info.txt

Update: I clean installed the latest (461.40) drivers, however I get the same result.

I also have a GTX 780 and am experiencing the exact same issue. Perhaps an issue with older hardware and newer driver (I'm running 460.89)? Attached screen recording and debug logs below. [8YrVDuthce.mp4](https://archive.blender.org/developer/F9755483/8YrVDuthce.mp4) [blender_debug_output.txt](https://archive.blender.org/developer/F9755477/blender_debug_output.txt) [blender_system_info.txt](https://archive.blender.org/developer/F9755478/blender_system_info.txt) Update: I clean installed the latest (461.40) drivers, however I get the same result.

Robert Guetzkow commented

2021-02-09 21:20:36 +01:00

Added subscriber: @Jeroen-Bakker

Robert Guetzkow commented

2021-02-09 21:20:36 +01:00

If this only happens with a GTX 780, I won't be able to reproduce this as I don't have access to that GPU. @Jeroen-Bakker Do you have one to test this?

Michael Glen Montague commented

2021-02-26 14:14:04 +01:00

Just found a task from last year detailing the same issue: #77731

Update: Upon further inspection, I noticed that the orange gradient on edges leading from selected vertices to nearby vertices isn't affected by this glitch. Maybe the difference in their rendering is key.

Just found a task from last year detailing the same issue: #77731 Update: Upon further inspection, I noticed that the orange gradient on edges leading from selected vertices to nearby vertices isn't affected by this glitch. Maybe the difference in their rendering is key. ![image.png](https://archive.blender.org/developer/F9842076/image.png)

Vaibhav commented

2021-12-15 05:13:52 +01:00

Added subscriber: @Code_Craft_Plugin