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Maniphest T90583

Image/Reference Background Opacity
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Description

System Information
Operating system: Linux-5.11.0-7620-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: Mesa Intel(R) HD Graphics 520 (SKL GT2) Intel 4.6 (Core Profile) Mesa 21.0.1

Blender Version
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: rB1eb06de2607a
Worked: (newest version of Blender that worked as expected)

When I add a reference or an image (for pathtracing a blueprint) and play with the opacity, the opacity is broken, it goes through a boolean process instead of a float). In few words, play with the opacity of a reference image.

Blender 2.93.2 version.

Related Objects

Event Timeline

Luciano (lucio83) created this task.Aug 10 2021, 5:14 PM
Pratik Borhade (PratikPB2123) changed the task status from Needs Triage to Needs Information from User.Aug 11 2021, 8:53 AM
Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).

Can not reproduce this on 2.93.3 rBfb7510087fdf. Can you recreate the issue on older versions?

From present information I followed these steps to verify the issue:

  • Add Image (⇧+A -> Reference)
  • Change the opacity of image from Object data properties tab

Please confirm if issue also happens with factory default settings?

Luciano (lucio83) added a comment.Aug 11 2021, 3:37 PM

Hi,

It's not in version 2.93.3, but in version 2.93.2
Yes i just tried it now with factory default settings too.
But if it is fixed in 2.93.3, i think i would need to wait for it to be a stable release if the issue isn't shown for{F10277507} this version.

Anyway, I am sending a video sample of the issue.

Evan Wilson (EAW) added a subscriber: Evan Wilson (EAW).Aug 12 2021, 12:40 PM

According to T77572, this is an issue with Mesa's Iris Driver and certain Intel 520/620/630 Graphics cards.

I believe the root cause is this, which also caused a similar issue for me with Houdini
As of Mesa 19.2, a new OpenGL driver, Iris, is available for testing. In Mesa 20.0, the Iris driver is promoted to be the default for Gen8+.
The Iris driver is causing issues with various OpenGL applications.
I am able to (temporarily) fix this issue by exporting MESA_LOADER_DRIVER_OVERRIDE=i965 in the shell before running Blender. This forces me back to the i965 driver, and opacity of reference images in Blender works again.

From https://developer.blender.org/T77572#994309

Try loading Blender after setting MESA_LOADER_DRIVER_OVERRIDE=i965
Also, try seeing if the issue occurs in 2.82a.
https://download.blender.org/release/

Evan Wilson (EAW) closed this task as Resolved.Oct 9 2021, 12:23 AM
Evan Wilson (EAW) claimed this task.

As 2.93.3 has been released I’ll close this report.