Blender 2.8 completely slows down by applied materials in Evee in rendered view #74276

New Issue

Werner · 2020-02-28T05:57:34+01:00

Werner commented

2020-02-28 05:57:34 +01:00

iMac 21' 2018, MacBook Pro 15' 2018, Mac Pro 2019 (MacOS Catalina 10.15.3)
GPUs: AMD 555X Pro, AMD Radeon Pro 560, AMD Vega 56, AMD Vega II 32GB respectively

This issue is present since Blender 2.8 beta and is still present in the latest 2.82. I did redo it on multiple Macs I have access, running MacOS Mojave or Catalina.

Rendered view Eevee;
4 objects: Cone, Plane, Cube, Icosphere (See uploaded blend-file)

Cone: Cone material
Plane: Plane.material
Cube: Cube material
Icosphere: Icosphere material
Material settings of cone, make viewport, or actually the whole of blender 2.8 very slow
When deleting cone, Blender returns to normal
When hitting CMD-Z to undo the deletion, it brings back the cone, and Blender slows down again.
When applying the Cone material to the Cube, Blender works fine again (!!)
When undo-ing that, and applying the Cone material to the Icosphere, Blender stays slow
Removing the red cube, makes Blender fast again (undoing that, Blender becomes slow again)
Removing Icosphere, Blender stays slow
Applying cone.material to Icosphere, Blender stays slow
Applying then the cone material to the Cube, then Blender becomes fast again.
Redoing previous steps, results stay the same.
Saving this project and opening it again: Same result
Changing the cone-material itself (giving the subsurface a value of 0.0) speeds blender up again.
Giving subsurface a high(er) value blender is still fast
Going back to the subsurface value of 0.036364 and Blender is slow again...
But the above three steps don't always work that way.
Putting the metallic shader blow 1.0 does the trick and makes it fast again.
Blender bug-slow.blend

iMac 21' 2018, MacBook Pro 15' 2018, Mac Pro 2019 (MacOS Catalina 10.15.3) GPUs: AMD 555X Pro, AMD Radeon Pro 560, AMD Vega 56, AMD Vega II 32GB respectively This issue is present since Blender 2.8 beta and is still present in the latest 2.82. I did redo it on multiple Macs I have access, running MacOS Mojave or Catalina. Rendered view Eevee; 4 objects: Cone, Plane, Cube, Icosphere (See uploaded blend-file) - Cone: Cone material - Plane: Plane.material - Cube: Cube material - Icosphere: Icosphere material - Material settings of cone, make viewport, or actually the whole of blender 2.8 very slow - When deleting cone, Blender returns to normal - When hitting CMD-Z to undo the deletion, it brings back the cone, and Blender slows down again. - When applying the Cone material to the Cube, Blender works fine again (!!) - When undo-ing that, and applying the Cone material to the Icosphere, Blender stays slow - Removing the red cube, makes Blender fast again (undoing that, Blender becomes slow again) - Removing Icosphere, Blender stays slow - Applying cone.material to Icosphere, Blender stays slow - Applying then the cone material to the Cube, then Blender becomes fast again. - Redoing previous steps, results stay the same. - Saving this project and opening it again: Same result - Changing the cone-material itself (giving the subsurface a value of 0.0) speeds blender up again. - Giving subsurface a high(er) value blender is still fast - Going back to the subsurface value of 0.036364 and Blender is slow again... - But the above three steps don't always work that way. - Putting the metallic shader blow 1.0 does the trick and makes it fast again. [Blender bug-slow.blend](https://archive.blender.org/developer/F6859691/Blender_bug-slow.blend)

Werner commented

2020-02-28 05:57:34 +01:00

Added subscriber: @camot

Ankit Meel commented

2020-02-28 06:15:18 +01:00

Added subscriber: @ankitm

Ankit Meel commented

2020-02-28 06:15:18 +01:00

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

Ankit Meel commented

2020-02-28 06:15:18 +01:00

Please add the steps to repro the bug.
a simple blend file to redo the issue.
feel free to take up those from the previous report, if they're still relevant.

- Please add the steps to repro the bug. - a simple blend file to redo the issue. feel free to take up those from the previous report, if they're still relevant.

Werner commented

2020-02-28 06:34:21 +01:00

Please klick on https://developer.blender.org/T62805

Everything is there!
A detailed description, a very simple scene (only 3 objects for download).
I cannot describe it any better than that..

I'm not the original poster of this issue, just someone who wants to have it resolved since it is persisting since 2.8 beta.

Please klick on https://developer.blender.org/T62805 Everything is there! A detailed description, a very simple scene (only 3 objects for download). I cannot describe it any better than that.. I'm not the original poster of this issue, just someone who wants to have it resolved since it is persisting since 2.8 beta.

Ankit Meel changed title from ~~Blender 2.8 completely slows down by applied materials in Evee in rendered view (Again)~~ to Blender 2.8 completely slows down by applied materials in Evee in rendered view

2020-02-28 07:35:43 +01:00

Ankit Meel commented

2020-02-28 07:36:00 +01:00

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

Ankit Meel commented

2020-02-28 07:36:00 +01:00

But someone has to answer questions, provide logs and then later test if the issue is resolved or not. I assume that you are able to do it, so I picked up the details from there.

Werner commented

2020-02-28 07:51:25 +01:00

Thank you for looking ito this!
Of course I‘m glad to provide any information helpful to solve the issue.
You are able to reproduce the issue aren’t you?

Thank you for looking ito this! Of course I‘m glad to provide any information helpful to solve the issue. You are able to reproduce the issue aren’t you?

Germano Cavalcante commented

2020-02-28 12:30:54 +01:00

Added subscriber: @mano-wii