Vertex duplication with skin modifier, Late visual update #87175

New Issue

Vyacheslav Kobozev · 2021-04-03T20:13:49+02:00

2021-04-03 20:13:49 +02:00

System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: since 2.79b. Tested with 2.93.0 Alpha, branch: master, commit date: 2021-04-01 15:32, hash: 76cdcc2bca

Short description of error
When skin modifier is applied and I duplicate vertex (not a root) at first i see vertex with skin, then (after extrude) skin disappear.

skin dupli.mp4

**System Information** Operating system: Windows-8.1-6.3.9600-SP0 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: since 2.79b. Tested with 2.93.0 Alpha, branch: master, commit date: 2021-04-01 15:32, hash: `76cdcc2bca` **Short description of error** When skin modifier is applied and I duplicate vertex (not a root) at first i see vertex with skin, then (after extrude) skin disappear. [skin dupli.mp4](https://archive.blender.org/developer/F9919115/skin_dupli.mp4)

Vyacheslav Kobozev commented

2021-04-03 20:13:49 +02:00

Added subscriber: @Vyach

Philipp Oeser commented

2021-04-06 11:43:36 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-04-06 11:43:36 +02:00

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

Philipp Oeser closed this issue

2021-04-06 11:43:36 +02:00

Philipp Oeser commented

2021-04-06 11:43:36 +02:00

Dont think this would be considered a bug.

Same is true for more operations (joining in a mesh will for example also not mark any vertex root -- it would be arbitrary which one)
Same is true for duplicating connected vertices (would be arbitrary to assign a root vertex -- which one?)

The thing with single vertices is an exception in code, these dont need a root assigned.

Automatic root assignment was discussed in #85461 (Mesh. Skin modifier shows nothing in viewport, when mesh do not have root.) as well.
So summing it up, I dont see a "late visual update" here? If there is no root, there is no update that is delayed, it is just not generating the skin at all (unless being a single vert - but I think this is expected behavior).

So I think we have to archive this one (but feel free to comment again if issues persist or if this is a misunderstanding).

Dont think this would be considered a bug. Same is true for more operations (joining in a mesh will for example also not mark any vertex root -- it would be arbitrary which one) Same is true for duplicating connected vertices (would be arbitrary to assign a root vertex -- which one?) The thing with single vertices is an exception in code, these dont need a root assigned. Automatic root assignment was discussed in #85461 (Mesh. Skin modifier shows nothing in viewport, when mesh do not have root.) as well. So summing it up, I dont see a "late visual update" here? If there is no root, there is no update that is delayed, it is just not generating the skin at all (unless being a single vert - but I think this is expected behavior). So I think we have to archive this one (but feel free to comment again if issues persist or if this is a misunderstanding).

Vyacheslav Kobozev commented

2021-04-06 17:11:53 +02:00

@lichtwerk oh, I see now!
1 vertex is always counts as root and might not have it.
Thanks for exlpanation.
But when skin disappear, it is still confusing.

@lichtwerk oh, I see now! 1 vertex is always counts as root and might not have it. Thanks for exlpanation. But when skin disappear, it is still confusing.

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Vertex duplication with skin modifier, Late visual update #87175