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Adding Skin to Single Vert in editmode object causes black vertices
Confirmed, NormalPublic

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89

Blender Version
Broken: version:

  • 2.92.0 Alpha, branch: master, commit date: 2021-01-07 22:28, hash: rB61f1faac3f21
  • 2.82a

Worked: 2.81a

Short description of error
When adding the Single Vertex object from the 'Add Mesh: Extra Objects' add-on, adding a Skin modifier in Edit Mode causes the mesh to display harsh black vertices, visually cluttering the mesh display. This becomes worse when you add a Subdivision modifier and activate X-Ray mode for easier working with the Skin modifier.

Once you switch from Edit Mode to Object Mode, then switch back to Edit Mode, the vertex display issue is gone. Toggling to Object Mode and back is always necessary, causing inconvenience.

Note that right after creating the single vertex, the solution of switching to Object Mode and then returning to Edit Mode doesn't make a difference in the display issue. The mode switch trick only works once you've extruded a vertex.

Exact steps for others to reproduce the error

  1. Start Blender and delete all objects for clarity.
  2. Activate the 'Add Mesh: Extra Objects' add-on in the Preferences.
  3. Press Shift + A ➔ Mesh ➔ Single Vert ➔ Add Single Vert.
  4. Press '1' for vertex mode, and press 'E' to extrude the vertex.
  5. Without exiting Edit Mode, add a Skin modifier and a Subdivision modifier.
  6. Press Alt + Z to activate X-Ray display mode. More and more black vertices become visible, causing visual clutter.
  7. Switch from Edit Mode to Object Mode, then switch back to Edit Mode. The black vertices will be gone, and mesh display is as it should be.

Event Timeline

Robert Guetzkow (rjg) updated the task description. (Show Details)
Robert Guetzkow (rjg) changed the task status from Needs Triage to Confirmed.EditedJan 8 2021, 2:03 PM

I can reproduce the problem all the way back to 2.82a. I can see the erroneously drawn vertices with just the Skin modifier, the Subdivision Surface modifier doesn't seem to be necessary, but makes it a bit easier to see.

An observation:

Right after creating the single vertex, the solution of switching to Object Mode and then returning to Edit Mode doesn't make a difference in the display issue. The mode switch trick only works once you've extruded a vertex.

Philipp Oeser (lichtwerk) renamed this task from Add Mesh: Extra Objects addon — Adding Skin to Single Vert object causes black vertices until you exit from Edit Mode to Adding Skin to Single Vert in editmode object causes black vertices.Mar 24 2021, 2:49 PM