Skin Modifier does not return to normal after mesh reduced to a single vertex #46567

New Issue

Seth L. · 2015-10-22T06:22:41+02:00

Seth L. commented

2015-10-22 06:22:41 +02:00

System Information
OS X 10.6.8
NVIDIA GeForce 320M

Blender Version
Broken: 2.76 RC3 fb76f6d
Worked: unknown

Short description of error
If an object has a Skin Modifier on it, the modifier stops working in the event that the mesh is reduced to a single vertex.
While this isn't likely to go noticed by a lot of people, it is inconsistent with expected behavior and may cause confusion.

Exact steps for others to reproduce the error

Create a simple mesh object like a plane
Add a Skin Modifier to the mesh object
In Edit Mode delete all but one vertex from the mesh
Extrude the remaining vertex into an edge and notice it is not "skinned"

  In order to remedy this, the Modifier must be deleted and a new one added from scratch.

**System Information** OS X 10.6.8 NVIDIA GeForce 320M **Blender Version** Broken: 2.76 RC3 fb76f6d Worked: unknown **Short description of error** If an object has a Skin Modifier on it, the modifier stops working in the event that the mesh is reduced to a single vertex. While this isn't likely to go noticed by a lot of people, it is inconsistent with expected behavior and may cause confusion. **Exact steps for others to reproduce the error** 1. Create a simple mesh object like a plane 2. Add a Skin Modifier to the mesh object 3. In Edit Mode delete all but one vertex from the mesh 4. Extrude the remaining vertex into an edge and notice it is not "skinned" ``` In order to remedy this, the Modifier must be deleted and a new one added from scratch.

Seth L. commented

2015-10-22 06:22:41 +02:00

Changed status to: 'Open'

Seth L. commented

2015-10-22 06:22:41 +02:00

Added subscriber: @quantumanomaly

Seth L. commented

2015-10-23 08:07:32 +02:00

Additional info:

When I submitted this I was on RC3. I've since upgraded to 2.76 and the bug is still present.

It seems not to always happen if you stay in Vertex Select Mode. However, if you switch to Edge Select Mode at any time while having only one vert it seems to happen every time.

Additional info: When I submitted this I was on RC3. I've since upgraded to 2.76 and the bug is still present. It seems not to always happen if you stay in Vertex Select Mode. However, if you switch to Edge Select Mode at any time while having only one vert it seems to happen every time.

Bastien Montagne commented

2015-10-23 08:34:12 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2015-10-23 08:34:12 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2015-10-23 08:34:12 +02:00

Bastien Montagne self-assigned this 2015-10-23 08:34:12 +02:00

Bastien Montagne commented

2015-10-23 08:34:12 +02:00

Thanks for the report, but no bug here really, thing is, outside of loose vertices, you need a 'root' vert for this modifier to work (in edit mode, select one vert and hit “Mark Root” in modifier panel). Root vert is circled by a dashed line in edit mode, so you can also delete all verts but two (defining an edge) and, as long as root one is deleted, you'll have no skinning either.

Seth L. commented

2015-10-23 20:42:35 +02:00

I see! It's all clear now. Thanks for explaining!

Just an idea for the future - how about if an alert message in the modifier were displayed when no root vertex is present?

I see! It's all clear now. Thanks for explaining! Just an idea for the future - how about if an [alert message in the modifier ](https://dl.dropboxusercontent.com/u/686388/posts/blenderbugreports/modifier-alert-message.png) were displayed when no root vertex is present?

Seth L. commented

2015-10-26 04:00:21 +01:00

Regarding my last comment, I can see now that it is possible to have a mesh with multiple pieces of disconnected geometry, some having a root vert (and therefor skinned) and others not. So even if a root vert is present on some pieces, if a root vert is not present on each piece the object will not be skinned entirely. So if an alert message were to be added it should probably be worded to include this idea.

Regarding my last comment, I can see now that it is possible to have a mesh with multiple pieces of disconnected geometry, some having a root vert (and therefor skinned) and others not. So even if a root vert is present on some pieces, if a root vert is not present on *each* piece the object will not be skinned entirely. So if an alert message were to be added it should probably be worded to include this idea.

Bastien Montagne commented

2015-11-03 15:01:11 +01:00

Done, thanks for suggestion.

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Skin Modifier does not return to normal after mesh reduced to a single vertex #46567