Issue trying to weight paint if object has mirror+armature. #71213

New Issue

Nahuel Belich · 2019-10-30T10:46:56+01:00

Nahuel Belich commented

2019-10-30 10:46:56 +01:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86

Blender Version
Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-10-28 21:19, hash: 2dab4393b0
Broken: hash: 2.81 95f020c853d6, build date: 2019-10-14, 00:11:29

Worked: f88022b96f3a build date: 28/08/2019, 01:48

Short description of error
If an object has an armature its normal to move bones to see the effect and paint on the deform mesh, this always worked.
In the lastest builds it seems that adding a mirror modifier after the armature modifier mess up how the object its read and the stroke doesn't register that the mesh its deformed.

Exact steps for others to reproduce the error
Mirror afects vertex paint, error.blend
1-Open the blend file
(it was tested using default factory settings too but it was created with my normal set up, you may see some addons active, as i said i also tested in a default settings)
2-try to paint in the blue circle(1), nothing should happen.
3-try painting in the red square(2) it should paint, as if the cylinder wasn't deformed.
4-Reload the .blend file
5-delete the mirror modifier and repeat step 2 and 3

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86 **Blender Version** Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-10-28 21:19, hash: `2dab4393b0` Broken: hash: 2.81 `95f020c853d6`, build date: 2019-10-14, 00:11:29 Worked: `f88022b96f3a` build date: 28/08/2019, 01:48 **Short description of error** If an object has an armature its normal to move bones to see the effect and paint on the deform mesh, this always worked. In the lastest builds it seems that adding a mirror modifier after the armature modifier mess up how the object its read and the stroke doesn't register that the mesh its deformed. **Exact steps for others to reproduce the error** [Mirror afects vertex paint, error.blend](https://archive.blender.org/developer/F7871880/Mirror_afects_vertex_paint__error.blend) 1-Open the blend file (it was tested using default factory settings too but it was created with my normal set up, you may see some addons active, as i said i also tested in a default settings) 2-try to paint in the blue circle(1), nothing should happen. 3-try painting in the red square(2) it should paint, as if the cylinder wasn't deformed. 4-Reload the .blend file 5-delete the mirror modifier and repeat step 2 and 3

Nahuel Belich commented

2019-10-30 10:46:56 +01:00

Added subscriber: @NahuelBelich

blender-admin commented

2019-10-30 10:46:56 +01:00

#72633 was marked as duplicate of this issue

blender-admin commented

2019-10-30 10:46:56 +01:00

#71804 was marked as duplicate of this issue

Germano Cavalcante commented

2019-10-31 14:37:04 +01:00

Added subscribers: @Jeroen-Bakker, @mano-wii

Jeroen Bakker was assigned by Germano Cavalcante

2019-10-31 14:37:04 +01:00

Germano Cavalcante commented

2019-10-31 14:37:04 +01:00

Can I confirm.
This is probably due to using a mesh_eval_deform instead of mesh_eval_final somewhere.
@Jeroen-Bakker, is this your area?

Can I confirm. This is probably due to using a `mesh_eval_deform` instead of `mesh_eval_final` somewhere. @Jeroen-Bakker, is this your area?

Likkez commented

2019-11-06 12:11:01 +01:00

Added subscriber: @Likkez-2

Likkez commented

2019-11-06 12:11:01 +01:00

Can confirm, happens while using Mask modifier too. Please fix, super annoying.

Demeter Dzadik commented

2019-11-06 12:17:48 +01:00

Added subscriber: @Mets

Demeter Dzadik commented

2019-11-06 12:17:48 +01:00

Perhaps the same root cause as #68352.

Would be awesome if these bugs got some love, it's been a pain in the butt having to disable mirror and mask modifiers every time I go into weight paint mode. Note that I also need to change shading options when going into weight paint mode ever since 2.80. This means going into or out of weight paint mode now takes 6-8 actions (and my script to automate these actions causes crashes).

Perhaps the same root cause as #68352. Would be awesome if these bugs got some love, it's been a pain in the butt having to disable mirror and mask modifiers every time I go into weight paint mode. Note that I also need to change shading options when going into weight paint mode ever since 2.80. This means going into or out of weight paint mode now takes 6-8 actions (and my script to automate these actions causes crashes).

Likkez commented

2019-11-06 12:21:57 +01:00

In #71213#806594, @Mets wrote:
Perhaps the same root cause as #68352.

Would be awesome if these bugs got some love, it's been a pain in the butt having to disable mirror and mask modifiers every time I go into weight paint mode. Note that I also need to change shading options when going into weight paint mode ever since 2.80. This means going into or out of weight paint mode now takes 6-8 actions (and my script to automate these actions causes crashes).

Yea, also the wireframe checkbox in weight paint does nothing now but that's a whole other issue.

> In #71213#806594, @Mets wrote: > Perhaps the same root cause as #68352. > > Would be awesome if these bugs got some love, it's been a pain in the butt having to disable mirror and mask modifiers every time I go into weight paint mode. Note that I also need to change shading options when going into weight paint mode ever since 2.80. This means going into or out of weight paint mode now takes 6-8 actions (and my script to automate these actions causes crashes). Yea, also the wireframe checkbox in weight paint does nothing now but that's a whole other issue.

Germano Cavalcante commented

2019-11-25 15:01:39 +01:00

Added subscriber: @Semple

Jeroen Bakker was unassigned by Germano Cavalcante

2019-11-25 15:04:01 +01:00

Alexander Gavrilov commented

2019-11-30 13:58:25 +01:00

Added subscribers: @icappiello, @angavrilov

Alexander Gavrilov commented

2019-11-30 13:58:25 +01:00

Mask can be moved after the Armature modifier, but mirror is a problem. This bug basically ignores all modifier starting with the first non-pure-deform modifier in the stack.

blender-admin commented

2019-11-30 17:07:44 +01:00

This issue was referenced by 893c29c15c

This issue was referenced by 893c29c15ca2fd95de79e9390b5650aaeabc999f

blender-admin commented

2019-11-30 17:07:44 +01:00

This issue was referenced by f1ac64921b

This issue was referenced by f1ac64921b49eaea8658d144754a1a532198c720

Alexander Gavrilov commented

2019-11-30 18:45:05 +01:00

Changed status from 'Open' to: 'Resolved'

Alexander Gavrilov closed this issue

2019-11-30 18:45:05 +01:00

Alexander Gavrilov self-assigned this 2019-11-30 18:45:05 +01:00

Alexander Gavrilov commented

2019-11-30 18:48:46 +01:00

Since there fortunately was a specific 'worked' and 'broken' version pair in this report, I found which specific change broke it and reverted it.

Now it just skips those Mirror and Mask modifiers like before, which is not ideal, but better than this behavior.

Since there fortunately was a specific 'worked' and 'broken' version pair in this report, I found which specific change broke it and reverted it. Now it just skips those Mirror and Mask modifiers like before, which is not ideal, but better than this behavior.

Germano Cavalcante commented

2020-01-21 01:00:17 +01:00

Added subscribers: @Lumpis_Wartimus, @JacquesLucke

Demeter Dzadik commented

2020-01-27 11:02:15 +01:00

Thanks a lot for the fix on this! An improvement I wish for, is if the modifiers that are not being considered by painting, could just be disabled entirely while in weight paint mode.

Currently, for the mirror modifier, we just can't paint on the mirrored part, which is not a big deal. But if there is a Mask modifier before the Armature modifier, we can paint on the masked out parts, which is very prone to making mistakes. Although I feel like it's not technically a bug, since the code is probably doing what it was intended to do, but it is an unfortunate side-effect. Should I open a fresh report?

Thanks a lot for the fix on this! An improvement I wish for, is if the modifiers that are not being considered by painting, could just be disabled entirely while in weight paint mode. Currently, for the mirror modifier, we just can't paint on the mirrored part, which is not a big deal. But if there is a Mask modifier before the Armature modifier, we can paint on the masked out parts, which is very prone to making mistakes. Although I feel like it's not technically a bug, since the code is probably doing what it was intended to do, but it is an unfortunate side-effect. Should I open a fresh report?

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Issue trying to weight paint if object has mirror+armature. #71213