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Maniphest T58763

"Sample colour" picks incorrect colour if Mirror modifier exists on mesh
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Description

System Information
Operating system: Ubuntu 18.04
Graphics card: Nvidia Geforce 1080

Blender Version
Broken: 2.80, 0f5b53ba4dc

Short description of error
"Sample colour" picks incorrect colour if Mirror modifier exists on mesh

Exact steps for others to reproduce the error

  1. Open the attached blend file
    text paint.blend702 KBDownload
  2. Press S key to sample the blue colour, and then paint in the red area, and vice versa
  3. Notice it does not paint with the expected colour
  4. "Apply" the Mirror modifier so it no longer exists in the modifier stack
  5. Attempt sampling colours and painting as above, notice it now paints with the expected colour.

Revisions and Commits

rB Blender
rB794aef3f259e Fix T58763: Sample color fails with mirror modifier

Related Objects

Event Timeline

Clint Hobson (Domarius) created this task.Dec 5 2018, 4:13 AM
YAFU (YAFU) added a subscriber: YAFU (YAFU).Dec 5 2018, 4:44 AM

For developers: after reloading packed Untitled.png image from Image Texture node for it to be shown in 3D View, you take several color samples with "S" key in different parts from the front. You will notice that sometimes the color sampled is the front color (blue) and sometimes the one from the back (red)

Sebastian Parborg (zeddb) assigned this task to Campbell Barton (campbellbarton).Dec 6 2018, 3:30 PM
Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 50.
Sebastian Parborg (zeddb) added a subscriber: Sebastian Parborg (zeddb).

I can confirm that this is bugged.
If I hold down the S key and hover my mouse over the blue side of the mesh (doesn't matter if it is on the mirrored part or not), I can see that the color picker flickers quickly between red and blue. If I apply the mirror modifier, the color seems to stay solid blue (as it should).

Sebastian Parborg (zeddb) mentioned this in T58760: Lost textures after closing file and reopening, and can't texture paint anymore.Dec 6 2018, 4:33 PM
Clint Hobson (Domarius) added a comment.Dec 6 2018, 11:32 PM

As a work around, I found that I can simply hide the mirror modifier while painting, rather than remove it altogether.

Campbell Barton (campbellbarton) changed the task status from Unknown Status to Resolved by committing rB794aef3f259e: Fix T58763: Sample color fails with mirror modifier.Mar 18 2019, 10:18 AM
Campbell Barton (campbellbarton) added a commit: rB794aef3f259e: Fix T58763: Sample color fails with mirror modifier.