Impossible to weight paint certain vertices #88665
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Reference: blender/blender#88665
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 466.47
Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-05-24 18:46, hash:
0606a37e1aBroken
a7ac8a22f8Worked
c8df6f2cf9(huh!)Broken
9a85592ddeBroken
382e7ce9ecBroken 2.81 release
Broken 2.80 release
Short description of error
Too often when weight painting it's impossible to paint over certain vertices.
Exact steps for others to reproduce the error
Weight Paint Bug.blend
Try to paint over the middle vertex (0 weight)
Added subscriber: @zanqdo
Added subscriber: @PratikPB2123
Changed status from 'Needs Triage' to: 'Confirmed'
Can reproduce the issue. version 3.0.0 alpha, Hash:
43153e2324, commit date:2021-05-24.It is really hard to paint when distance between vertices is quite more. Confirming the issue for now but I believe the problem is due to present algorithm (not sure though) ?
Added subscriber: @lone_noel
To me it seems like the combination of the Corrective Smoth and Subdivision Surface modifier makes it so you have to paint on the original position of the vertex, rather than the position after modifier evaluation:
wertex-paint-bug.mp4
Painting with only one of these modifiers enabled works as expected for me.
Added subscribers: @Sergey, @lichtwerk
@Sergey might be interested, some commits by him at that time (see report description when this was broken/working), relevant:
5e332fd700cc1614123ef1ac64921bAbout combination of modifiers, I have to add that the problem happens with different combinations and sometimes no modifiers. It's just that's the case I could catch this time.
Added subscriber: @PabloDobarro
Could be an issue with
BKE_crazyspace_build_sculpt()or with some modifiers which use input mesh for coordinates, or something.I do see one revision did work. Did anyone bisected which change did break such scenario? This will give some clues about where to look.
Added subscriber: @JulienKaspar
I'll just mark this as a bug since the expected behaviour seems pretty clear. There is a bigger design discussion with sculpt mode that touches this issue though: #87034
Maybe there should be an option to choose if the original cage is targeted or the modified mesh.
Added subscriber: @angavrilov
Afaik weight painting draws with all modifiers, but for actual painting only uses deform modifiers (basically those that don't change mesh topology, e.g. armature). This means for painting subdivision surface doesn't exist. I have no idea why it is so, but I've already ran into that in D14163 (native hiding required because can't be faked with Mask).