Mesh triangulation is visible with specular lighting enabled in 3D viewport #68151

New Issue

eldee smith · 2019-08-02T23:27:59+02:00

eldee smith commented

2019-08-02 23:27:59 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1050 Ti with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
Worked: (optional)

Short description of error
When specular lighting is checked, mesh triangulation is faintly visible. See attached screenshots

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1050 Ti with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` Worked: (optional) **Short description of error** When specular lighting is checked, mesh triangulation is faintly visible. See attached screenshots ![enabled.png](https://archive.blender.org/developer/F7646297/enabled.png) ![disabled.png](https://archive.blender.org/developer/F7646296/disabled.png)

eldee smith commented

2019-08-02 23:27:59 +02:00

Added subscriber: @testure

Stephen Swaney commented

2019-08-03 01:17:41 +02:00

Added subscriber: @StephenSwaney

Stephen Swaney commented

2019-08-03 01:17:41 +02:00

Got a .blend showing the problem?

eldee smith commented

2019-08-03 08:29:42 +02:00

It happens on the default cube, there's nothing particularly special about the blend file but I'll attach it anyway. I imagine this is more to do with hardware?

It looks like the mesh triangulation is being added to the specular term, it seems to be affected by lighting. See the attached video.

wirebug.blend

2019-08-03 01-23-09.mp4

It happens on the default cube, there's nothing particularly special about the blend file but I'll attach it anyway. I imagine this is more to do with hardware? It looks like the mesh triangulation is being added to the specular term, it seems to be affected by lighting. See the attached video. [wirebug.blend](https://archive.blender.org/developer/F7646828/wirebug.blend) [2019-08-03 01-23-09.mp4](https://archive.blender.org/developer/F7646829/2019-08-03_01-23-09.mp4)

Stephen Swaney commented

2019-08-06 18:29:18 +02:00

I can't reproduce. Linux, nvidia 1060, binary driver

eldee smith commented

2019-08-13 04:22:46 +02:00

Ok, so I have some more information. This bug is being caused by bgl.glEnable( bgl.GL_POLYGON_SMOOTH )! I noticed that the issue was only happening when a particular studio script was triggered (which I'm not able to share here unfortunately), but if I comment that one line out the artifacts go away.

If that's not enough information I can put together a test script that can isolates the issue and can demonstrate the problem on any hardware if you like

Ok, so I have some more information. This bug is being caused by bgl.glEnable( bgl.GL_POLYGON_SMOOTH )! I noticed that the issue was only happening when a particular studio script was triggered (which I'm not able to share here unfortunately), but if I comment that one line out the artifacts go away. If that's not enough information I can put together a test script that can isolates the issue and can demonstrate the problem on any hardware if you like

Adam Preisler commented

2019-09-18 13:41:24 +02:00

Added subscriber: @AdamPreisler