Particle hair: X mirror UI doesnt show 'topology mirror' option (even though it is being used for ADD and CUT brushes) #72473

New Issue

Massimiliano Puliero · 2019-12-16T09:11:19+01:00

2019-12-16 09:11:19 +01:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.28

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: f1aa4d18d4

Short description of error
hair "X Mirror" option doesn't work on some area of the mesh.

Exact steps for others to reproduce the error

Please open the file
paint some hair around the head to see that on the back the X mirror option doesn't work.

In case open the attached gif to see what happen on my PC.

Thank you

hair_simmetry_bug.blend

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.28 **Blender Version** Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: `f1aa4d18d4` **Short description of error** hair "X Mirror" option doesn't work on some area of the mesh. **Exact steps for others to reproduce the error** Please open the file paint some hair around the head to see that on the back the X mirror option doesn't work. In case open the attached gif to see what happen on my PC. Thank you [hair_simmetry_bug.blend](https://archive.blender.org/developer/F8225308/hair_simmetry_bug.blend) ![hair.gif](https://archive.blender.org/developer/F8225314/hair.gif)

Massimiliano Puliero commented

2019-12-16 09:11:19 +01:00

Added subscriber: @MassimilianoPuliero

Philipp Oeser commented

2019-12-16 12:19:38 +01:00

Added subscribers: @WilliamReynish, @Harley, @pablovazquez, @lichtwerk

Philipp Oeser commented

2019-12-16 12:19:38 +01:00

Hm, this is because Topology Mirror option is enabled for editmode tooloptions.

Same is true for 2.79 here, but it is very confusing that this option is being considered for particle editmode as well [and we are not even showing it here :/]

Digging a little deeper:

stuff happens in brush_edit_apply
pe_x_mirror checks ME_EDIT_MIRROR_X only
then PE_mirror_x / mesh_get_x_mirror_faces checks ME_EDIT_MIRROR_TOPO as well (to use in mesh_get_x_mirror_vert)

Sooo, Topology Mirror fails for this mesh (but it does moving verts in editmode, too -- this is 'normal' for this mesh I assume). Thats why particle edit brushes fail here, too.

I would actually vote for this not being a bug 'per se', but it is highly misleading to not show the Topology Mirror option for the Cut & Add particle edit brushes...
Guess this is one for the UI mafia, would strongly suggest adding this option (see above)

CC @WilliamReynish , @pablovazquez, @Harley

Hm, this is because `Topology Mirror` option is enabled for editmode tooloptions. Same is true for 2.79 here, but it is very confusing that this option is being considered for particle editmode as well [and we are not even showing it here :/] Digging a little deeper: - stuff happens in `brush_edit_apply` - `pe_x_mirror` checks `ME_EDIT_MIRROR_X` only - then `PE_mirror_x` / `mesh_get_x_mirror_faces` checks `ME_EDIT_MIRROR_TOPO` as well (to use in `mesh_get_x_mirror_vert`) Sooo, `Topology Mirror` fails for this mesh (but it does moving verts in editmode, too -- this is 'normal' for this mesh I assume). Thats why particle edit brushes fail here, too. I would actually vote for this not being a bug 'per se', but it is highly misleading **to not show** the `Topology Mirror` option for the `Cut` & `Add` particle edit brushes... Guess this is one for the UI mafia, would strongly suggest adding this option (see above) CC @WilliamReynish , @pablovazquez, @Harley

Philipp Oeser changed title from ~~hair X mirror option doesn't work properly~~ to Particle hair: X mirror UI doesnt show 'topology mirror' option (even though it is being used for ADD and CUT brushes)

2019-12-16 12:21:28 +01:00

blender-admin commented

2019-12-16 12:25:42 +01:00

This issue was referenced by 56fc0f411f

This issue was referenced by 56fc0f411fb5c8b71d916d834c5435e667d14d1a

Philipp Oeser commented

2019-12-16 12:27:55 +01:00

See D6418: Fix #72473: Particle hair: X mirror UI doesnt show 'topology mirror' option (even though it is being used for ADD and CUT brushes) for a fix...

See [D6418: Fix #72473: Particle hair: X mirror UI doesnt show 'topology mirror' option (even though it is being used for ADD and CUT brushes)](https://archive.blender.org/developer/D6418) for a fix...

Philipp Oeser commented

2019-12-19 14:25:28 +01:00

Changed status from 'Open' to: 'Resolved'

Philipp Oeser closed this issue

2019-12-19 14:25:28 +01:00

Philipp Oeser self-assigned this 2019-12-19 14:25:28 +01:00

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Particle hair: X mirror UI doesnt show 'topology mirror' option (even though it is being used for ADD and CUT brushes) #72473