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Skin Modifier:Root bone in the armature generated by skin modifier can't be moved
Closed, ResolvedPublicBUG


System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Worked: (newest version of Blender that worked as expected)

Short description of error

Root bone in the armature generated by skin modifier can't be moved.Location values are changeable manually in the transform panel in Pose mode but nothing happens to the root bone still.

Exact steps for others to reproduce the error

OS Conditon: WIN 10 |Blender: 2.92.0 Alpha

  • Default scene.
  • Merge the default cube vertices then extrude the merged vertex to arbitrary location thus having an edge.
  • Add a skin modifier to the "edge" object then click CreateArmature in the modifier tab.
  • Go into Pose mode and the bone can't be moved.

Below is an alternative blender file for demo:

In the file I created a primitive with a three-edge line for Skin modifier to generate armature (left one in the picture),the root bone of the generated armature can't be moved.
The right one is a duplication of the left one in which armature I created a new bone and made the new bone the parent of the root bone that created by Skin modifier ,then I unparented them,after this I found the root bone can then be moved.