Vertex merging: topology editing, x mirror, extrude, automerge off #76233

New Issue

Vyacheslav Kobozev · 2020-04-29T16:47:44+02:00

2020-04-29 16:47:44 +02:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59

Blender Version
Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-04-26 22:51, hash: d0d16eb7d3
Worked: (newest version of Blender that worked as expected)

Short description of error
If i extrude and cancel with mirror edit, Blender do automerge for some vertices (automerge is off). A know, that is wrong approach to select mirror vertices and use mirror, but I don`t think it should automerge.
2020-04-29_17-35-29.mp4

Exact steps for others to reproduce the error

Take default cube. Edit mode
Switch on X-mirror
Select face on the +Y-side
Extrude {key E} and cancel move {key RClick}
Move selection to +Y ({key G} {key Y})

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59 **Blender Version** Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-04-26 22:51, hash: `d0d16eb7d3` Worked: (newest version of Blender that worked as expected) **Short description of error** If i extrude and cancel with mirror edit, Blender do automerge for some vertices (automerge is off). A know, that is wrong approach to select mirror vertices and use mirror, but I don`t think it should automerge. [2020-04-29_17-35-29.mp4](https://archive.blender.org/developer/F8501213/2020-04-29_17-35-29.mp4) **Exact steps for others to reproduce the error** - Take default cube. Edit mode - Switch on X-mirror - Select face on the +Y-side - Extrude {key E} and cancel move {key RClick} - Move selection to +Y ({key G} {key Y})

Vyacheslav Kobozev commented

2020-04-29 16:47:44 +02:00

Added subscriber: @Vyach

Pasang Bomjan commented

2020-04-29 17:13:20 +02:00

Added subscriber: @Pasang

Pasang Bomjan commented

2020-04-29 17:13:20 +02:00

I can confirm. But it isn't merged. It also happens in 2.79.

Vyacheslav Kobozev commented

2020-04-29 19:09:52 +02:00

@Pasang just checked, you are right.
So it looks like it work «properly»: vertices selected, with mirror mirrored (positions but not topology) selected virtually too.

But there is another strange thing then: why only one side captured and other isn`t.

@Pasang just checked, you are right. So it looks like it work «properly»: vertices selected, with mirror mirrored (positions but not topology) selected virtually too. But there is another strange thing then: why only one side captured and other isn`t.

Vyacheslav Kobozev commented

2020-04-29 19:27:23 +02:00

Okay, it looks like an error in searching mirrored pair for each vertex.
I assume simple mirror just search for first vertex with mirrored cordinate. And that is a result. If so, It is not a bug but a limitation of current algorythm
2020-04-29_20-20-38.mp4

Okay, it looks like an error in searching mirrored pair for each vertex. I assume simple mirror just search for first vertex with mirrored cordinate. And that is a result. If so, It is not a bug but a limitation of current algorythm [2020-04-29_20-20-38.mp4](https://archive.blender.org/developer/F8501582/2020-04-29_20-20-38.mp4)

Germano Cavalcante commented

2020-04-29 19:50:16 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-04-29 19:50:16 +02:00

It would be necessary to look in more detail.
But unpredictable behavior is to be expected when more than one mirrored vertex has the same position.
Topology is not considered in the simple case.

I don't think it is worth investigating this issue.
This is certainly a limitation when vertices occupy the same position.

It would be necessary to look in more detail. But unpredictable behavior is to be expected when more than one mirrored vertex has the same position. Topology is not considered in the simple case. I don't think it is worth investigating this issue. This is certainly a limitation when vertices occupy the same position.

Germano Cavalcante commented

2020-04-30 14:35:05 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Germano Cavalcante closed this issue

2020-04-30 14:35:05 +02:00

Germano Cavalcante self-assigned this 2020-04-30 14:35:05 +02:00

Germano Cavalcante commented

2020-04-30 14:35:05 +02:00

As described in the comment above, although it is not ideal it is experimented with mirror logic without considering topology.
So closing.

As described in the comment above, although it is not ideal it is experimented with mirror logic without considering topology. So closing.

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Vertex merging: topology editing, x mirror, extrude, automerge off #76233